Gasfitting Flashcards
What does Section 8.1.4 of the CAN/CSA-B149.1-XX deal with?
It starts to set limits as to how size various appliances, as single or total of multiple appliances.
What is the piping between the wellhead and the processor called?
production pipe line
What is the maximum filling density of a propane cylinder by weight.
42% of the water capacity stamped on the cylinder.
Plastic piping shall only be used for ________.
outdoor undrground services.
Clause 6.2.16
What is covered in Section 8.2.1 of the the CAN/CSA-B149.1-XX Code book.
Defines the 2 different construction types (tight or loose) and how to size accordingly.
What is the purpose of a line relief device?
To protect the appliances and equipment from over-pressuring.
Which form of latent heat changes propane liquid to propane gas?
vapourization
Which type of heat can easily be focused?
radiation
Which iof the following is NOT a method of heat transfer?
- Radiation from the sun
- Radiation from a large rock
- Conduction to face cloth soaked in hot water
- Convention in a steel bar
- Convention in a steel bar
What MUST be done to a new cyclinder before it can be filled?
It must be purged of moisture and air.
What does this chemical symbol represent? H
hydrogen
A drip pocket shall be provided where _________.
condensate may collect, such as points where the piping is exposed to either wide ranges or sudden changes in temperature.
Clause 6.13.5
What elevation qualifies as high altitude for appliances, and what is the input reduction factor when appliances are installed above high altitudes?
2000 feet to 4500 feet (600m to 1350m) above sea level;
de-rate at 4% per 1000 feet (300m) or part thereof.
Clause 34.3.1 (Both B149.1 and 149.2 Codes)
Define Draft Hood.
A Draft Hood is a fixed opening draft control device having neither movable nor adjustable parts. A draft hood may be built into an appliance, attached to an appliance or made to be part of a common vent.
What is the principle of motivation of the gases in the natural draft systems?
Hot gases rise (convection)
What does this chemical symbol represent? CO
carbon monoxide
Why are gas-fired infrared heaters becoming so popular for applications such as large shops?
Heat is not wasted by warm air lost out doors when overhead doors are open.
What is the proper name of the gas Code?
CAN/CSA - B149.1 Natural Gas and Propane Installation Code
Deifne Forced Draft
Forced draft is a mechanical draft produced by a device upstream from from the combustion zone of an appliance.
How are naturally occurring hydrocarbons, such as oil and gas, believed to be produced?
Decayed organic materials subjected to extreme temperatures and pressure is believed to produce naturally occurring hydrocarbons.
State the density of water in lb/cu inch and the specific gravity.
- 0.0361 lb/cu inch
- 1 specific gravity.
What does GVR (general venting rules) C.2.2 state?
A chimney with one or more sides exposed to the outside is considered to be exterior unless it contains a Type B vent or chimney system.
What is the vaporization capacity of a 100 lbs propane cylinder at -10*F that has a diameter of 14.6 inches and a height of 48.5 inches?
49,567 Btuh
vaporization capacity = cylinder diameter X cylinder hieght X factor
-10*F has a FACTOR of 70
A hose may be used to connect an unvented appliance when ___________.
it is mobile or requires isolaction from vibration.
Clause 6.20.2
A commercial tubing system shall be identified at ____ intervals.
A commercial tubing system shall be identified at 20 feet (6m) intervals.
Clause 6.17.1
Examples of density of water?
- 1000kg/m3
- 62.4lbs/gal
What is the difference between a Compound and a Mixture?
A compound is a chemical union of different molecules while a mixture contains different molecules of different elements, but not chemically united.
Define : Force
The amount of push or pull exerted over the entire area
Define Combustion?
A self-sustaining process; once started, the temperature liberated by combustion will be maintained above the ignition point.
How far must weeds and long dry grass or other flammable materials be clear of a propane tank?
10 feet (3m)
Define Super A Venting
Super A Venting is :
- Contstructed with a inner and outer Stainless Steel pipe.
- There is 2” space between walls filled with fiber insulation, like rock wall.
- The temperature flue rating is up to 2100*F (1150*C) for 3 minutes
- Continuous operating temperatures of 1200*F (650*C)
- Used with Solid or Liquid burning appliances.
What is the difference between heat and temperature?
Temperature is a specific point on a thermometer, heat is energy.
What happens in a propane tank in concerns to the state of the propane when pressure is bleed off the tank?
As the pressure in the tank drops so does the boiling temperature of propane (C3H8). More heat is drawn from the exterior of the tank. The liquid starts to boil and expands 270 times its original volume, causing pressure to build up again.
How frequently should an excess valve be tested?
When it is installed
Then annually after that
What is the weight of a cylinder with a WC (water capacity) of 48 lbs and a TW (wieght cyclinder empty) of 17.6 libs when filled?
37.76 lbs
42% (water capacity) of 48 lbs PLUS 17.6 lbs TW (cyclinder empty)
What type of appliance can not be connected to a chimney?
A single stage fan appliance is not allowed.
The chimney will have to lined with B-Vent or a certified liner.
What must you do after pressure testing and purging gas lines?
Perform a Standing and Opertaing pressure test.
If the pressure drop is greater than what is allowed, the gas line has been UNDER sized and must be sized again.
What is the importance of the OPD?
OPD (overfill protection device)
It prevents the accidental overfilling of a cylinder.
State the density of water in oz/cu inch and the specific gravity.
- 0.578 oz/cu inch
- 1 specific gravity.
A colume of water one meter high exerts a pressure of :
- 4.33 kPa
- 6.936 kPa
- 9.81 kPa
- 13.6 kPa
- 9.81 kPa
Define Vent Connection.
A vent connection is the part of a venting system that conveys the flue gases from the flue collar of an appliance to a chimney or vent (may include a draft control device).
When may the CAN/CSA - B149.1 Natural gas and Prpane Installation Code be applied to mobile homes?
When structural alterations made to the ignition are prohibited #4.8.2
What does GVR (general venting rules) C.2.10 state?
Venting a single “Mid Efficient” appliance into a masonry chimney is NOT ALLOWED
A Corrugated Metallic Liner or B-Vent installed into the chimney to convey gases.
What is the pressure, in kPa, exerted by one atmosphere at sea level?
101 kPa
A residential tubing system shall be identified at ___ foot intervals.
six (6) foot intervals maximum in accordance with Clause 6.17.1
Clause 6.17.3
What is Category IV Appliances with venting?
An appliance that operates with a Postive vent static pressure and a flue loss of no less than 17%. These is High-Efficient Appliances.
Example is a Condensing Gas Furnace
For permanent installation a hose shall not exceed ___ feet in length.
NOT exceed 10 feet in length.
Clause 6.20.39 (a)
Clearance for vent connectors made of other than Type B material may be reduced if protected in what manner?
As outlined in Table 8.7.
What is a Direct Vent Appliance?
- Direct vent appliance require a special type of venting.
- Which will NOT connect to to Types B, L or BW vent.
- They are not consided Category I.
- Pipe system is a corrugated aluminum pipe that has one size of pipe running INSIDE of a larger pipe.
What is the density of air in lb/cu ft?
0.076 lb/cu ft
Define : Vacuum Pressure
Vacuum Pressure is :
Pressures below standard atmospheric pressure.
Perfect Vacuum is 0 psi
Threaded schedula 40 steel piping may be used for pressures not exceeding _____ psi.
125 psi
Clause 6.2.3
What 3 conditions are needed for Combustion to take place?
- Oxidizer (oxygen)
- Fuel
- Heat
Which of the following may not be used to determine the filling capacity of a propane tank?
Float Gauge
What is the most likely termination location of a direct-vent appliance?
Outdoor, adjacent to an exterior wall
What is the thickness required for a 5” or smaller GSG vent connector?
5” or smaller is 28 GSG
Is there an easier way to do air required for combustion calcuations?
The CAN/CSA-B149.1-XX produces constructed tables to make it quick and easy.
When an 90* elbow is installed in the vent connector, what must had to the table capacity rating?
- With Draft Hoods the table capacity rating reduced 10%
- Fan-assisted appliances the table capacity rating reduced 15%
Insulation on a pipe prevents what type of heat transfer?
Mainly prevents heat losses due to Conduction.
What are the rules for the termination of a vent pipe of a pressure control device?
Pressure Control Device Venting termination rules are :
- Must be at least 3 feet (1m) from a MOISTURE EXHAUST duct (dryer vent)
- Must be at least 3 feet (1m) from a COMBUSTION AIR inlet
- 10 feet (3m) from a MECHANICAL INLET
Define BH Vent
BH Vents are :
- Installed on high-efficient appliances (categories II, III and IV)
- Constructed entirely of factory-made parts of PVC.
- Designed for condensing gases in the venting.
- Must comply with ULC standards, PVR used after October, 2006 with ULC S636.
What is the minimum required fixed opening % when an automatic damper is installed on an appliance with a standing pilot light?
20%
What are two different names for a non-aerated flame?
- Luminous flame
- Non-linting flame
What are the requirements for dealing with defective residential heat exchangers?
Residential heat exchangers must be replaced and not repaired. Clause 34.21.1
What is Charles Law?
Must be done in Rankine or Kelvin (absolute temeperatures
V1 T2 = V2 T1
- T1 = Orginal Temperature
- T2 = New Temerpature
- V1 = Orginal Volume
- V2 = New Volume
A vent connector manifold should not exceed _____” for every ____” of diameter.
A vent connector manifold should not exceed 18” for every 1” of diameter.
What is the minimum effective heigth for a vent?
Minimum effective venting heigth is 5 feet (1.5m) from the highest draft hood to where the it terminates outside.
What is the maximum temperature for B-Vent?
470*F
What does GVR (general venting rules) C.2.11 state?
The Corrugated Metallic Liner must have the table cpacity reduced by 20% to accommodate vent restictions of the rough inner surface.
If B-Ventis installed, No table reductions are to be done.
REMEMBER to account for for bends - anything over 2 - 90* changes of direction.
What does this chemical symbol represent? C
carbon
Why are ports of induced draft burners larger than ports of natural draft burners?
To reduce (lower) flow restriction through the burner
What does the term Venturi principle mean?
Partial vacuum due to fluid flow through a narrow opening.
How does latent heat differ from sensible heat?
Latent heat does not change the temperature of a substance only the state it is in.
Define Liquefaction Ratio.
The number of cubic feet of gas at STP that will condense into a given unit of volume of liquid (this is the opposite of vaporization ratio). Propane 270 (liquid) cubic feet / cubic foot 43.6 (vapour) cubic foot / Gallon Methane 240 (liquid) cubic feet / cubic foot 38.5 (vapour) cubic foot / Gallon
How does a metallic object become warmer by heating it from one end?
Conduction Heat. Heat energy conducts from molecule to molecule through the metal
Which type of flue damper is not allowed in residential applications?
Manual Dampers
List the 3 uses for liquefied petroleum gases?
- Feedstock for petrochemical industry
- Heating
- Auto fuel
What does GVR (general venting rules) C.2.15 state?
If the desired Vent Hieghts and Cent Connetor rise and/or lateral are between the tables entries.
Linear interpolation shall be permitted for calculation of the permissible appliance input ratings.
Extrapolation beyond the table entries shall not be acceptable.
NOTE : Rounding hieghts DOWN and laterals UP has been adopted as an acceptable practice.
Mercury in a glass tube could be classified as
- Adhesive
- Cohesive
- Cohesive
Which of the following is an example of Convection?
- The heat felt from a fire pit
- The warmth provided by a down ski jacket
- The heat felt by touching a hot water pipe
- Smoke rising from the chimmney of a wood-burning fireplace
- Smoke rising from the chimmney of a wood-burning fireplace
List 3 methods of identifying drilling sites for oil and gas?
- Aerial photography
- Examination of rock outcropping
- Seismology
How is the Relative Density of solids and liquids found?
By comparing Relative Densities (specific gravity) to the density of Water.
At what point does the gasfitter’s jurisdiction start in a gas supply piping system?
At the out of the gas meter or/and downstream of the supplier’s tank on a propane system.
A colume of water one inch in heightexerts a pressure of what?
0.0361 psi
Where can you find the regulations governing gas installations inside buildings?
The regulations can be found in a CAN/CSA - B149.1
Define Input Rating
This is the number of Btu consumed by the burner(s) when an appliance operates for one hour.
What happens to the volume of water as it changes to steam?
Water expands 1700 times its original volume.
What are the characteristics of a liquid state?
Liquid has definite volume and definite weight but no definite shape.
What is the maximum number of supports on a propane tank?
2 Pads or Piers
What sizing table would you use to size a schedule 40 gas line on low-pressure CH4 (natural gas)?
Table A2 (page 118)
What is the function of the preface section in the CAN/CSA - B149.1 Code?
To supply background on CAN/CSA - B149.1 development
What is specific heat?
Energy needed to warm a specif volume of a substance by one degree.
A flame with a two part cone is developed by what type of burner?
- premix burner
- forced draft burner
- yellow flame burner
- inshot burner
- premix burner
Name the 4 states of matter.
- Solid
- Liquid and
- Gas
- Plasma
Is corrugated metal liner equal to B-Vent when installed in a masonary chimney?
Yes
What is the standard atmospheric pressure boiling temperature of propane liquid?
-44*F -42*C
Appliances should be installed as close as is practical to the vertical vent so the vent connector is what?
Appliances should be installed as close as is practical to the vertical vent so the vent connector is as SHORT and DIRECT as POSSIBLE.
What is the minmum clearance that B-Vent have when going through a combustable wall?
1”
When an existing piping or tubing system is of insufficient size for additional appliances, the extension shall _________________.
be a separate line for the new appliance sized for the additional load and connected to the main within 24 inches of the meter.
Clause 6.6.2
A girder, beam or joist may be cut for the installation of piping.
TRUE or FALSE
TRUE
But NOT so as to weaken it beyond its required purpose. Obtain approval from the on-site general contractor/engineer.
Clause 6.8.4
What does GVR (general venting rules) C.2.16 state?
Always use the smallest vent possible when more sizes are possible on the Tables.
Larger than needed vents slow down the convey of hot gasses, this allows them to cool and condense. BAD
Why is the excess flow valve installed?
To control the flow of propane in case of a line rupture or breakage
What piece of equipment must be used in conjunction with a propane cylinder when a cylinder is used on a construction site?
A pressure regulator
Define Induced Draft
Induced Draft is a mechanical draft produced by a device downstream from the conbustion zone of an appliance.
When sizing a Metal Manufactured Chimney, what regulations must be used?
The manufactures recommendations must be used.
CAN/CSA B149.1XX Code does not cover thes chimneys.
List 5 gas appliances a corrugated metal connector may be used to connect.
Shall be a MAXIMUM of 6 feet in length
Clause 6.21.3(a)(b)(c)
- Range
- Refrigerator
- Clothes Dryer
- Built-in counter appliances
- Suspended appliances
- Decorative appliances
- Room heater
What must all gas-fired appliances be connected to?
Chimney or vent
What is the rule of thumb for determining the maximum diameter of any vent connector?
The maximum diameter of the vent connector should be the same as the appliance flue collar or draft control device outlet.
What is the Maximum gas pressure allowed in a single family home?
2 psig (14 kpa)
How many times is mercury heavier than water?
13.6
What is Pressure of the Atmosphere is equal to?
Pressure of the Atmosphere is equal to :
The pressure created by a column of Mercury (Hg) 29.92 inches high.
14.7 pounds per square inch (psi)
Appliances with a draft 4” or less can NOT be reduced.
TRUE or FALSE.
TRUE
What is the standard atmospheric pressure boiling temperature of butane liquid?
32*F 0*C
What is the formula to find how many BTU to raise the temperature of a substance?
Btu = Weight X temperature raise X specific heat.
What temperature is water the most dense?
39*F (4*C)
When must a pressure gauge be installed on a propane tank?
Propane tanks with a capacity over 2000 USWG (7500 L) require a pressure gauge.
How many pipe hangers would you need on a 30 ft horizontal section of 1” pipe?
5 hangers.
1 for each end and 1 every 10 feet.
Table 6.2 (page 43)
What does GVR (general venting rules) C.2.4 state?
For each additional 90* change over 2 elbows, must have the tables de-rated.
Draft Hood 10%
Fan Assisted 15%
What does GVR (general venting rules) C.2.6 state?
Offsets on the common vents:
- For 2 - 90* change of direction Table must be reduced by 20%
- Lenghts as per Table C9 or 1.5ft X diameter.
- For 2 - 45* change of direction, Table must be reduced by 10%
What is the density of water in lb/cu ft?
62.4 lb/cu ft
List the 3 methods used to check draft conditions in a gas venting system.
- Match Test
- Smoke Test
- Gauge Test
Which is an example of a Chemical Change?
- Seperation of water into hydrogen and oxygen
- Water turning to steam
- Soider being liquified
- Taking oxygen from the air
1Seperation of water into hydrogen and oxygen.
What is the maximum size of opening in a spit valve not requiring an excess flow valve?
The Number 54 Orifice
With a positive pressure vent, how high must the vent be above the roof?
- The highest point where it passes through the roof and past anything (snow) minimum of 18” (450mm)
- On a sloped roof, it must extend 18” (450mm) highert than any obstruction within 18” (450mm)
What part of a propane tank may be field-welded?
Saddle Plates or Brackets
If only 2 units of oxygen are required for complete combustion of 1 liter of methane,
why must 10 units of air be supplied for complete combustion of 1 unit of methane?
There are 2 units of oxygen in 10 units of air.
What is the main didderence between a propane tank and a propane cylinder?
- The size of the container determines whether it is a tank or a cylinder
- Tanks are filled by volume, while cylinders are filled weight.
- Tanks are stationary, while cylinders are portable
- The standards and approval agency responsible for certification
- The standards and approval agency responsible for certification
Define : Gauge Pressure
Gauge Pressure is :
Pressures that DO NOT include atmospheric pressure
What are the 2 type of vent used in Factory Built Chimneys?
- A Vent
- Super A Vent
What is the minimum wall thickness for the vent connector on a gas-fired incinerator?
20 GSG (Galvinized Sheet Metal Gauge
How far from a cylinder must combustible materials be (including long grass and weeds)?
10 feet (3m)
What is the thickness required for over 30” GSG vent connector?
Over 30” is engineered (8.18.3)
What are 2 types of Barometers?
- Mercury (most accerate)
- Aneroid (easier to handle)
What are approximate percentages of combustion air and secondary air for theoretical combustion ?
- Combustion 60% and secondary
- 40% for theoretical combustion.
- Add 40% excess air on top of that.
Piping or tubing shall be painted or coated when ___________.
outdoor piping, indoor piping or tubing systems are exposed to corrosive atmospheres.
Clause 6.16.1
What are the naturally occurring products of gas wells that are later processed and separated into natural gas and its by-products called?
NGL (natural gas liquids)
When may a Type B vent material be required for a vent connector?
When the vent connector is run through an unheated space.
What condition product upward flow of vent gases in a natural draft appliance?
Chimney effect
Define Draft.
Draft is the flow of air or combustion products or both through an appliance and its venting system
What colour flame is a good indication of complete combustion?
blue
What is ther minimum start-to-discgarge pressure setting of a hydrostatic relief valve?
375 psig (2500kPa)
How do we measure the total height of a common vent servining 2 or more appliances?
From the highest connected draft hood or flue collar to the level of the rain cap.
What is a propane cylinder?
- A container that is connected to a barbecue
- Any container that holds propane
- A container that you throw away when empty
- A container certified through CTC-DOT
- A container CERTIFIED through CTC-DOT
What is the WC of a propane cylinder?
Wieght of WATER the cylinder can hold when full.
What is the specific gravity of methane in vapour state?
0.6
Define specific gravity as it applies to solids or liquids
It is comparison of a volume of a substance (liquid or solid)
The flow of solder into a joint is a result of what?
Adhesion and Capillary Attraction
What is the difference between an Element and a Compound?
A compound is a chemical union of different molecules while an element contains only molecules of that element.
The maximum temperature of combustible surfaces shall not exceed what temperature?
The maximum temperature of combustible surfaces shall not exceed 194*F (90*C).
What does this chemical symbol represent? H2O
water
A compound that consists of only Hydrogen and Carbon would be a definition of what :
- Monoxide
- Dioxide
- Hydrocarbon
- LP gas
- Hydrocarbon
In the specification CTC 4BA240, what does the 240 stands for?
Minimum rated working presser
What is the function of the Bulletins and STANDATAS issued in relationship to the CAN/CSA-B149.1 Code?
To provide amendments and interpretation of the CAN/CSA-B149.1 in relationship to safety and installation requirements for Alberta.
What are the minimum dimensions for accessibility to an appliance through opening?
24 inches by 30 inches. Clause #4.14.3
What does this chemical symbol represent? O2
oxygen
Besides being fully open on a minimum of 2 sides, what other Code requirments must be met when terminating a vent under a deck?
The deck must be at least 12” (300mm) above the top of the vent.
Define Natural Draft.
Natural Draft is any draft other than a mechanical draft.
Define Exterior Chimney?
One or more sides are exposed to the outside.
Unless it contains a B-Vent inside of it.
What type of electrical lighting equipment may be used searching for a gas leak?
Class I group D (explosion proof). Clause #4.12.2
Is Aberta consided a High Altitude location?
Yes, All gas-firing appliance must be de-rated by 10% idicated on the rating plate when installed.
What device must be installed between a pair of shut-off valves on liquid propane installations?
Hydrostatic relief valve
What does LP refer to as a fuel?
Liquefied Petroleum
What are the products which result from complete of the reactants Oxygen and Methane?
Carbon Dioxide and water vapour
Define L Vents
Type L Vent is :
- Double walled vent pipe used on OIL burning appliances.
- Inner liner is Stainless, Outer wall is Galvanized Iron
- Maximum flue gass temperature rating is 570*F (299*C)
- Manufavctorer recommends that the minmum distance form combustibles be at least 3 inches
Which location is not acceptable for the installation of propane cylinders?
Below Grade
Propane lies in low places
specific density 1.5
Elbows reduce or increase the capacity of the vent or vent connector?
Reduce
What is the function of the CAN/CSA - B149.1 Code?
To set minimum standards and acceptable practices for installation of gas equipment.
Define Ignition temperature?
The minimum temperature required before combustion can occur.
Where should the relief valve on a propane cylinder be located?
So that it communicates with the vapour space at all times.
A vent appliance may be connected by a hose.
TRUE or FALSE
FALSE
Clause 6.20.1
What does GVR (general venting rules) C.2.14 state?
Appiles to the lowest appliance connected to a multi-story vent.
- 1st Floor appliance is sized off Tables C.1 or C.2
- All other floors, vent connectors to be sized off Tables C.3 or C.4 using the input of those appliances
- The common vent is sized using the combined inputs of appliance on that floor as well as all appliances upstream (below) floors) of the vent connector connection to the vent
Which schedule of steel pipe with threaded joints is required for liquid propane?
Schedule 80
Can a vent connection run through a return air duct?
NO, that’s stupid
List the 3 main gases present in the atmosphere according to their %
- 20% oxygen
- 79% nitrogen
- 1% other gases
What does GVR (general venting rules) C.2.12 state?
Vent Hieght with 2 or more Appliances:
- Vent must be at least 5ft, measured from the highest flue collar outlet or draft hood outlet to the base of the rain cap.
- Vent connector rise shall be measured from the draft hood outlet or flue collar to the level where the vent gas streams come together.
How far must a vent terminate through a roof?
- On a flat roof the vent must extend a minimum of 2 feet (600mm)
- Sloped roof the vent must extend 2 feet (600mm) higher than any portion of a building within 10 feet (3m).
Natural rubber may be used as a gasket material
TRUE or FALSE
FASLE
Natural Rubber is dissolved in the presence of gas
Clause 6.9.7
Piping or tubing may be supported by any large pipe in the system
TRUE or FALSE
FALSE
Clause 6.8.3
Why do some burners have flame deflectors?
To prevent hot spots in the combustion chamber.
Which of the following is a correct definition of density?
The mass per unit volume
What does Section 8 of the CAN/CSA-B149.1-XX deal with?
Venting systems and the air supply that is required for natural gas and propane fired appliances.
What happens to the volume of water as it nears freezing point?
Water expands slightly
Define the heating value of a fuel?
The heat in a volume of fuel that is released by combustion.
A tracer wire must accompany plastic piping when _______________.
used underground (since plastic pipe is only permitted to be used outdoor underground. it is safe to say ALWAYS)
Clause 6.15.14
State the density of water in lb/Imp Gallon and the specific gravity.
- 10 lb/Imp Gallon
- 1 specific gravity.
A purge line shall be no larger than ___ diameter NPS for purging a line up to 4” NPS.
A purge line shall be no larger than 1/2” diameter NPS for purging a line up to 4” NPS.
Clause 6.23.2
What is the regulation regarding smoking or other sources of ignition when working on piping that contains or has contained gas?
Smoking and other sources of ignition are prohibited. Clause #4.10
What is the piping the processor and the city gate called?
transmission lines
How many Btu are required to raise the temperature of 10lb of water 20*F?
200 Btu
What is the density of air ?
- .076 lbs/ft3
- 1.29 Kg/m3
When connecting 2 or more vents to the Common Vent Connector Manifold, what must be done to the venting capicity?
Do to turbulence of vent gases, the venting capacity must be reduced by 10% of the table capacity.
What is the maximum filling density for a propane cylinder filled by volume?
80%
Is the maximum filling density for a propane cylinder filled by volume
What is the category of a substance that has indefinite shape, indefinite volume and definite mass?
- solid
- liquid
- gas
- solution
- solid
Define Common Vent Connector Manifold
This is the common header that connects the venting of 2 or more appliance prior the common vent.
What are chimneys designed for?
Chimneys are designed for the conveying the products of combustion, to the outdoors from SOLID, LIQUID or combination (dual fuel) fueled appliances.
When a propane vent line discharges vertically upwards, what is required on the outlet end?
A loss-fitting cap
What is the relative density of propane gas and natural gas?
Propane 1.5
Natural Gas .6
Define Flame Temperature?
The maximum temperature reached inside the flame. The hottest part of the gas flame is just above the tip of the inner cone. The coldest part is the base of the inner cone.
What is the minimum rated working pressure for a propane cylinder?
240 psig
What is the maximum size of a container that can use a spit valve to assist in the filling process?
5 lbs Propane Capacity
How does attitude effect venting?
Not enough oxygen
How are the combustibles wall or partition penetrations for other than Type B material for vent connectors made.
They are made by the use of a ventilated thimble not smaller than the dimensions listed in Clause 8.18.12.
What is the Rule of Thumb with venting?
Only to darft hood appliances.
The vent connector will be the same size as the appliance draft hoodor flue collar outlet. The chimney will be 1 size larger.
What is the minimum distance between a 1500 gallon (5800L) propane tank and a property line?
10 feet (3m)
Atmospherice pressure is producted by what?
The weight of the air over the earth’s surface.
A gas line operating at 10 “ w.c. shall be designed to prevent the loss of no more than ___” w.c.
A gas line operating at 10 “ w.c. shall be designed to prevent the loss of no more than 1” w.c.
Any thing under 10” w.c. is 1/2 “ w.c.
Clause 6.3.2
Define Output Rating.
The amount of usable heat from the combustion process that enters the medium being heated (water, air).
How do you vent a fireplace were the ground level is to high?
Snorkel and Vent Extension Kit will give you the 12” of clearance needed from ground level.
Underground piping may be covered 24 hours before being tested.
TRUE or FALSE
FALSE
Pressure test must be done and passed prior to concealing pipe.
Clause 6.22.5
What is the purpose of the fixed liquid level gauge (spit valve)?
To determine when the maximum filling density is reached.
The maximum range of a test gauge shall exceed the test pressure by at least ___ %, but NOT greater than ____ %.
The maximum range of a test gauge shall exceed the test pressure by at least 15 %, but NOT greater than 300 %.
Define Double-acting Barometric Damper.
A double-acting barometric damper is a draft control device intended to stablize the natural draft in an appliance by admitting room air to the venting system. A double-acting draft regulator’sbalancing damper is free to move in either direction.
What does this chemical symbol represent? CH4
methane
What must be done before you pressure test the 2 psig gas system?
Remove the regulator (NOT rated for pressure testing) and install a spool piece to test to.
Gas piping, tubing and fittings may not be reused unless ____________.
they were used on gas before and are in as good as new condition.
Clause 6.1.2
What is the minimum required height above grade for a propane tank pad?
At least 3 inches (75mm)
Define : Surface Tension
The molecular attraction of the molecules to each other at the surface of the liquid.
A branch line must be the same diameter as the supply piping when _______.i
it supplies an unknown furture connection.
Clause 6.10
What is the general clearance requirement for vent connectors made of Type B material?
1”
Define specific gravity as it applies to vapour (gases).
It is the comparison of the weight of a substance (gas or vapour) compared to an equal volume of air.
An addition to an existing gas line is not subject to Table 6.3 (pressure testing requirements) when _____________.
Clause 6.22.4 (a)(b)
An addition to an existing gas line is not subject to Table 6.3 (pressure testing requirements) when IT IS
- LESS THAN 20 feet LONG and working pressure is less than 0.5 psig
- IS A WELDED TIE IN.
Why does the induced draft appliance use a fan on the outlet of the appliance?
To over come the resistance of the heat exchanger to move the flow of products of combustion through it.
Review this Venting Diagram
What is the purpose of the internal safety control valve?
To shut off the flow of propane liquid in case of fire
Pressure test and duration of tests shall be in accordance with _______.
Pressure test and duration of tests shall be in accordance with Table 6.3.
Clause 6.22.2 (d) (page 54)
What are the three mechanisms by which heat is transferred?
- radiation 2. conduction 3. convention
What does GVR (general venting rules) C.2.8 state?
Mid Efficient Appliances with Modulating Inputs (Category I) :
- Low fire must be equal to or greater than “FAN MAX”
- High fire must be equal to or less than “FAN MAX”
In appliance does not fall into the table then you must default to the other table.
The two factors that affect the state in which matter exists are :
- Pressure
- Temperature
What is the significance of the Q-CC1 propane cylinder valve over the standard POL Valve?
It has an excess flow valve.
A gas line 4” NPS or larger that has been tested with air must be purged with _____ _____ or ______ and then purged with gas.
A gas line 4” NPS or larger that has been tested with air must be purged with CARBON DIOXIDE or NITROGEN and then purged with gas.
Clause 6.23.2
What type of connection is required for a valve that is liquid withdrawal?
Any connection other than a POL.
Define : Pressure
The force divided by the area
What is the minimum distance between a 1000 gallon (3800L) propane tank and a wood-framed building?
10 feet (3m)
A column of water one foot in height exerts a pressure of what?
0.433 psi
With a fan assist type appliance, can you reduce the vent connector size?
Yes, you will require the maximum capacity listed in the appropriate table be reduced by 10%.
Which of the following statement is NOT correct
- Volume affects pressure
- The shape of the container does not affect pressure
- The height and density of the liquid affect pressure
- The lenght of level piping does not affect pressure
- Volume affects pressure
What is a Category III Appliance in venting?
An appliance that operates with a Postive vent static pressure and a flue loss of no less than 17%. These is in Mid and Low Efficiency Appliances.
A natural draft hot water tank with an input rating of 42,250 Btuh is being installed in a residential semi-attached garage.
What Table will you us for the vent and vent connector sizing?
Table C.2
What are 3 main responsibilities of the installer with respect to the installation of gas-fired appliances?
- leave the appliance(s) in a safe working order
- instruct the user in the proper, safe operation of the appliance(s).
- leave the manufactures’s information booklets with the appliance(s) user
What force makes Stack Action possible?
Buoyancy
Combustion air sizing is taken from where on the appliance?
input rating
What is the general clearance requirement for vent connectors made of other than Type B material?
6 inches
State the density of water in lb/cu ft and the specific gravity.
- 62.4 lb/cu ft
- 1 specific gravity.
A 2 psig systems allow up to a ___ % pressure drop, deoending on the table.
A 2 psig systems allow up to a 75 % pressure drop, deoending on the table.
What does this chemical symbol represent? Hg
mercury
How do you convert Celsius into Kelvin?
Temp. in C* PLUS 273*
What must be done to reduce the combustion clearance for venting?
A metal sheild can be installed throught the penetration. The shield must be constructed so there is a 1” air space betwwen the metal and the penetration.
What is the minimum wall thickness for an aluminum vent connetor?
22 Brown and Sharp Gauge
A colume of water one inch in height exerts a pressure in onces, of what?
0.578 oz/square inch
What is the formula for Clocking the Gas Meter at operating pressures of 7”-14” w.c. ?
Size of providing dial OVER number of seconds per revolution.
Then multiple by 3600 (60sec X 60 minutes).
THIS WILL give you Cubric Feet of Gas per Hour
If a PRESSURE CORECTING is needed for elevation of appliance, then multiple the above answer by PRESSURE FACTURE
What is a vent connector rise?
A vent connector rise is the vertical distance measured from the connection on the appliance (flue collar or draft device) to the centreline of the connection into the chimney or vent.
What piping material is NOT approved to convey liquid propane?
Polyethylene Pipe
Where can vent terminal NOT be located?
- Directly above paved sidewalks or drive ways. WInter time will make ice patches.
- Less than 7 feet above a public sidewalk or paved driveway. This is to prevent tampering or being blocked.
- Within 6 feet of a mechanical air supply inlet to any building. This will prevent flue gases from re-entering the building.
- Within 3 feet of any gas service regulator vent outlet.
- Less than 12” above ground level
Which of the following is an example of Conduction?
- Cold feet when walking on inheated ceramic tile floor
- The hot coals on a barbecue heating hamburgers
- Warm air currents rising above the ocean
- The air circulation in a living room
- Cold feet walking on inheated ceramic tile floor
The Rule of Thumb (ROT) for vent sizing only applies to what types of appliances?
Draft Hood Gas-Fired Aplliances
What is the specific gravity of propane liquid?
0.51 (0.508)
Define BW Vents
BW Vents are :
- Constructe in the same manner as B vent, but oval
- Maximum teperature rating is 470*F (240*C)
- EXCLUSIVELY to be used on recessed wall heaters. 2” X 4” wall thickness.
- Minimum effective hiegh is 12 feet. From base of recessed wall to point of termination.
What is the ratio between air and methane to make complete combustion happen?
10 air : 1 methane PLUS 40% excessive air
What is the purpose of a venting system?
A venting system provides a quick postive draft and removes the products of combustion to the outdoors.
What are the 2 types of chimneys?
- Factory Build Chimney
- Field Constructed Chimney
Define Products of Combustion
These are Products of Combustion;
- Carbon Dioxide (CO2)
- Carbo Monoxide (CO)
- Carbon (C)
- Water Vapour (H2O)
- Heat
What does GVR (gerneal venting rules) C.2.1 state?
Rule of Thumb sizing is ONLY for Draft Hood Appliances.
If we used more than 2 elbows in a vent connect, each additional elbow will reduce the table capacities by ______ for draft hood appliances and ____ for fan assisted appliances.
10% Draft Hood Appliances
15% Fan-Assisted Appliances.
Which type of flue damper is allowed as an aftermarket add-on for residential appliances?
Thermally operated dampers
What does this chemical symbol represent? CO2
carbon dioxide
All system regulators with inlet pressure above 1/2 psig (3.5kpa) shall be of the _______ ____-___ type?
All system regulators with inlet pressure above 1/2 psig (3.5kpa) shall be of the POSITIVE SHUT-OFF type?
How does the specific heat of water differ from that of ice?
Specific heat of ice is two times less than that of water ( ice 0.5 , water 1 )
Define Factory Built Chimney.
Factory Built Chimney is constructed of meatal parts.
Referred to as Metal Manufactured Chimneys.
Who’s responsibility is it to ensure that masonary chimney liner is in good shape prior to installing a gas-fired appliance?
The installer of the gas fire appliance.
If cast iron is less dense than copper, why is cast iron pipe heavier than copper tube?
The pipe wall of cast iron is thicker
Is Carbon Monoxide flammable?
YES. When mixture with air at 12%-74% Carbon Monoxide.
How many cylinders connected together to form a system can be installed against the wall of a building?
4
What is the motive force in venting the products of combustion?
Convection
How doe you convert Fahrenheit to Rankin?
Temp. in Fahrenheit PLUS 560*F
What is the standard atmospheric pressure boiling temperature of water?
212*F 100*C
What is the minmum distance between a building opening and the vent terminal of a direct-vent appliance with an input of 50,000Btu?
12 inches (300mm)
What is Boyles law?
P1 V1 = P2 V2
- V1 = Orginal Volume
- V2 = New Volume
- P2 = Orginal Pressure
- P2 = New Pressure
What is the maximum size of bypass hole in the excess flow valve?
a number 54 orifice drill
Type L or G copper tubing may be used underground when _________.
it has been coated with extruded PVC or polyethylene resin at the time of manufacture.
Clause 6.2.7
When installing a Pressure Regulator, what are 7 concerns.
- Install in the correct flow direction
- Rated for the correct inlet pressure
- It is ADVISED to have a pressure test point installed upstream and downstream of regulator.
- Ensure ALL packing material has been removed from the body of the regulator.
- Vents should be installed on the vertical plane, pointing down.
- NEVER bypass the regulator
- All regulators shall be vented to the outdoors unless they are approved and equiped with a ball check leak-limiting device.
Where should a propane cylinder that is NOT connected for use be stored?
Outdoors, standing up
What is Density?
Density = Mass (weight) DIVIDED by Volume
Define Appliance Efficiency.
Appliance Efficiency is equal to :
- Output of Appliance
- = ——————————-
- Onput of Applliance
What is the relationship between volume and pressure in Bolyle’s Law?
Pressure increases, volume decreases
How has a 2-psi gas system stimulated new markets?
- Reducing costs by using smaller pipe to transfer the same volume of gas compared to low pressure systems.
- Providing equal or greater protection to homeowners in the event of an uncontroled gas escape from the piping system.
What does GVR (general venting rules) C.2.13 state?
Multi-Story Vent Height :
The total vent height for each floor is from the highest draft hood outlet or flue collar entering the common vent on that floor to the centerline of the vent connector connection of the next floor.
Which of the following is most likely to be a direct-vent appliance?
- Boiler
- Unit Heater
- Water Heater
- Fireplace
- Fireplace
What is the minimum wall thickness of a GSG vent connector without dilution air?
24 Galvinized Sheet Metal Gauge
What is a Category I Appliance in venting?
An appliance that operates with a NON-postive vent static pressure and a flue loss of no less than 17%. These appliances have draft hoods or inducer fans that do NOT produce enough airflow to cause a postive pressure in the vent.
Example is Draft Hood Appliance or Inducer Fan Gas Furnace.
What sizing table would you use to size copper tubing gas line on low-pressure C3H4 (propane)?
Table B.6 (page 161)
What are the minimum dimensions for accessibility to an appliance through passageways?
36 inches by 36 inches. Clause #4.14.4
When you design a gas supply piping or tubing system, you must ensure it will do what?
Large enough to meet the gas and pressure requirements of the appliances specifications.
Define Flue Gas Dilution.
Flue Gas Dilution is the ambient air that is admitted to a venting sysem at the draft hood, draft diverter or draft regulator.
Define A Vent.
A Vent is :
- Manufactactured metal chimney
- The inner liner is Stainlee Steel, outer is Galvanized Iron
- There is a 1” thick of mineral fiber insulation between the inner liner and the wall of the pipe.
- To be used to vent OIL burning appliances, NOT solid fuels
Which of the following is the densest?
- Aluminium
- Copper
- Mercury
- Steel
- Mercury
What is the thickness required for a 10”- 16” GSG vent connector?
10”- 16” is 24 GSG
What is the minimum distance between a cylinder relief valve and a building opening below the relief valve?
3 feet ((1m)
What level of standards is established in the CAN/CSA - B149.1 Code for the installation of gas-fired appliances?
minimum standards
State the density of water in lb/US gal and the specific gravity.
8.33 lb/US gal and 1 specific gravity.
What is the formula find out how time an aplliance will run on X Btu?
Btu Available TIME = _____________ Appliance Input
When a piping system is purged outdoors, the purge point must NOT terminate closer than ___ feet from a building or an air intake.
When a piping system is purged outdoors, the purge point must NOT terminate closer than 10 feet from a building or an air intake.
Clause 6.23.7
What is the purpose of the strainer in the liquid propane piping?
To remove foreign materials from the propane.
What is the formula ( tank diameter X tank length X factor) used for?
To calculate the VAPORIZATION RATE of a propane tank.
Because corrugated liner has a rough inner liner surface, vent table capacities must be reduced by what %?
The tables must be reduced by 20%
What is the function of the pressure relief valve?
To protect the cylinder from over-pressure.
Why is the production of carbon monoxide from an appliance such a concern?
It accumulates in the blood and asphyxiates.
Define Extrapolation when looking at charts.
Is an estimation of a value based on extending a known sequence of values or facts beyond the area of known information.
NEVER do this with venting charts
What is the purpose of the bypass hole in the excess flow valve?
To allow the valve to return to its open postion.
Who is responsible for ensuring that a propane cylinder is not overfilled?
The person filling the cylinder.
A draft control will dilute the products of combustion _____ and lower the gas temperature by about _______.
A draft control will dilute the products of combustion 50% and lower the gas temperature by about 150*F-180*F.
What is the type of exhaust pipe on a gas dryer considered to be?
Moisture exhaust duct; should not be connected to a chimney or vent.
What is the piping between the city gates and the building called?
distribution lines
What controls the amount of air that can enter an atmospheric burner?
Air Shutters
Define B-vent
Be vent is a round, double walled pipe.
The inner liner is aluminum, the outer wall is galvinized.
Between the 2 walls is dead air space (nominal 1/2”).
Must be labled for indoor or outdoor use.
What is the density of air (lbs/cubic foot) at STP (standard temperature and pressure).
0.076 pounds per cubic foot
Finished piping and appliance connections shall be checked under _____ _____ pressure with a ____ _______ or a ____ ________ _______.
Finished piping and appliance connections shall be checked under NORMAL OPERATING pressure with a SOAP SOLUTION or a LEAK DETECTION DEVICE..
When burning gas, what is the significance of the following temperature? 3500*F
The flame temperature of propane
What is covered in Section 8.2.2 of the the CAN/CSA-B149.1-XX Code book.
There you will find the appropriate tables for the appliances that you are installing.
Liquid dishwashing detergent could be classified as :
- Adhesive
- Cohesive
- Adhesive
Which one of the following statements is NOT true?
- Pressure is exerted in all directions
- Density affects pressure
- Height does not affect pressure
- Volume does not affect pressure
- Height does not affect pressure
Which direction does heat travel?
Warm body to Cooler body
What does GVR (general venting rules) C.2.9 state?
Venting into a Masonary Chimney :
- The equicalent internal area from Tables C.10 must fall between the minmum and maximum internal areas from the charts.
- The capacity of the tables CAN NOT exceed the total combined input combined of appliances by more than 25%.
- A Fan Assited appliance MUST be ran with a Draft Hood appliance to prevent condensation from forming in chimney.
Does the flame temperature change how many Btu of energy a petroleum gas/liquid has in it?
No. even if there is carbonizing or oxidizing.
Underground tubing systems shall be joined by means of what?
- Blazing (1000*F).
- approved mechanical compression fittings.
- approved flare fittings.
- press-connect fittings
Clause 6.15.3
What happens to a Thermally operated damper when the bimetal stripe or coil fails?
The damper will open
How is an excess flow valve sized?
50% MORE than the flow rate of all of the appliances.
Define Flue Gases
Flue gases are combustion products and excess air.
Piping and tubing shall be least __ “ below a commercial driveway or parking lot.
buried 24 inches.
Clause 6.15.4
What is the reduction % for installing an off-set in a Common Vent?
20% of the table capacity. (equal to 90* elbows).
What does all gas burning equipment require?
excessive air air to ensure that there is complete combustion.
How many cubic feet of gas are in 1 gallon propane liquid?
43.6 cubic feet / Gallon
Who is responsible for the approval of the installation of gas-fired appliances?
The authority having jurisdiction
A fan-assisted furnance with an input rating of 135,000 Btuh is being installed in a new home.
What chart will you use for the venting?
Table C.1
What is the name given to the geological areas in which oil and gas deposits are found?
Sedimentary basins
A corrugated metal hose connector shall not exceed 2 feet in length when _________.
connecting a suspended appliance or a decorative appliance.
Clause 6.21.3(b)(c)
Clause 6.21.3 (a) state 6 feet maximum for house appliances that sit on floor.
What are 2 constituents of the Products of Combustion that can form due to Incomplete Combustion of a fuel?
- Aldehydes
- Carbon monoxide
List the 2 basic types of draft control devices used on gas fired appliances.
- draft hoods
- double-acting draft regulators (barometric damper)
What gas has the as a calorific value of 2500 Btu/cu ft?
Propane
What precaustion must be taken when transporting propane cylinder?
The cylinder must be secured in an upright position.
What is the thickness required for a 6”- 8” GSG vent connector?
6”- 8” GSG is 26 GSG
Which of the following is an example of radiation?
- The radiator in a car
- The high heat of a space shuttle entering the atmosphere
- The warmth felt sitting in the sun
- The heat felt when you touch a hot piece of metal
- The warmth felt sitting in the sun
What measurement system is used to enforce Code requirements?
Imperial
What gas has the as a calorific value of 1000 Btu/cu ft?
Methane (natural gas)
How is the Relative Density of Gasses found?
By comparing the Relative Density to the density of Air. The Densities of Air are :
- 0.076 lb/ft3
- 1.29 Kg/m3
What is the maximum equivalent length of a combustion air duct ducting allowed without increasing the size?
20 feet. After 20 feet up the size by 1 inch. Can not exceed 50 feet.
What does Charles Law State?
Charles Law is a formula to find temperarure or volume when in direct relationship.
- A constant pressure the volume of a given mass (amount) of gas is directly proportional to its absolute temperature
- The greater the increase in temperature, the greater increase in volume.
What is one of the greatest concerns when an appliance does not completely burn its fuel?
carbon monoxide poisoning
What must a Fan-assited Appliance be connected to a chimney along with what other appliance?
With a Draft Hood Appliance
The draft hood appliance will keep the chimney warm do to the pilot light running.
This prevents the cold from turn vent gases to condensate.
What is the name of the provincial authority that has direct jurisdiction over the regulation of gas installations?
Alberta Municipal Affairs
What is the benefit of using an infrared heater on an outside patio?
It heats people without heating the air
Define Interpolate when using charts.
Interpolation is an estimation of a value within 2 known values in a sequence of values.
An inspirtated burner is found on a/an
- Forced air draft appliance
- Natural draft appliance
- Induced draft appliance
- High efficiency appliance
- Natural draft appliance
A sleeve must be provided where piping or tubing passes through pavement in order to ________.
permit the free movement of the piping and vent any gas that may be escaping from an underground leak to prevent migration into a building.
Clause 6.15.10
What is the minimum rated working pressure for a propane tank?
250 psi
When making a change in size of the vent connector for an appliance, were do we make the change?
Draft Hood.
What is the minimum required distance between a source of ignition on an appliance and floor level in a repair garage?
54 inches (1400mm) Clause 4.16.3
What kind of decorative appliance can be installed in a bedroom or a bathroom?
It must be a Direct Vent
or
Certified and Marked to for installation for bedroom/bathroom
A vent can be any shape.
TRUE or FALSE
TRUE
Tubing run inside HOLLOW walls within 1.75” shall be protected by ________.
No.16 GSG (1.59mm) plates or sleeves.
This DO NOT apply to tubing going directly thrpough a wall.
Clause 6.16.4
What 2 factors should draft control devices be installed in accordance with?
- The manufacturer’s specifactions
- The CAN/CSA B149.1-XX Natural Gas and Propane Installation Code (Part 8).
Which types of flame is a Bunsen flame?
Aerated flame
What does Section 8.1 of the CAN/CSA-B149.1-XX deal with?
Describes the ground rules and which appliances Code applies to. Further states that Clauses 8.2 to 8.5 do not apply to direct vent appliances.
What sizing table would you use to size a PE (polyethylene) gas line on low-pressure?
Table A.2 (page 118)
Define British thermal unit (Btu)
The amount of heat energy required to raise the temperature of 1 lb of freah water 1*F
The sizing and installation of a 2 psig ( 14 kpa ) MANIFOLD system requires that 3 serpate activities occur, what are they?
- First size and execute the 2 psig pressure line from Outlet of meter to System regulator.
- Then size and execute the 7”-14” w.c. pressure line (manifold) from Outlet of system regulator to furthest appliance.,
- Size and execute branch lines indepently from manifold to appliance.
List 3 types of materials that may be used for vent connectors.
- Galvanized Steel
- Aluminum
- Type B vent
What is another term for Rapid Oxidation?
Combustion
What are the two main burners classes?
- Atmospheric
- Forced draft
What is the thickness required for a 18”- 30” GSG vent connector?
18”- 30” is 20 GSG
What is the specify gravity of water?
One
What is the maximum pressure setting of the first-stage regulator in a residential application?
NO more than 10 psig (70kPa)
When does Atmospheric Preaaure decreases approximately, due to elevation?
Decreases of Atmospheric Pressure
- 1 inch (25mm) Hg for every 1000ft (300m) above sea level
- 1 psi for every 2000ft above sea level
- 1 kPa for every 90m above sea level
In theory, how high could a perfect vacuum lift water?
- 33.949 feet
- 10.296 meters
Death valley is 200 feet below sea level. If you boiled water there, what would you expect the boiling temperature to be?
The boiling temperature would be greater than 212*F (100*C)
What is the minimum distance between a pressure relief valve discharge and a building opening below the discharge?
3 feet (1m)
What is the basice design difference detween a draft hood and a barometric draft control?
The draft hood has no moving parts (fixed opening).
Which section of the CAN/CSA - B149.1 does the definitions section follow?
It follows the Scope of the CAN/CSA - B149.1
What is the maximum filling density of a propane tank by volume?
80% of the water capacity
What is the maximum gas pressure allowed in a residential dwelling?
2psig
After an appliance is connected and before the gas is turned on, a check shall be made to ensure ________________________.
that no openings permit the escape of gas, etc.
Clause 6.22.3 (a-e)
What is the difference between sweet and sour gas?
Sour gas contains hydrogen sulphide which has a sour smell.
What is the function of the scope section in the CAN/CSA - B149.1 Code?
It indicates where the CAN/CSA - B149.1 should/should not be applied in the gasfitting trade.
Define : Element
A substance that cannot be chemically reduced any further.
What is the maximum size of propane cylinder that may be used indoors without permission from the authority having jurisdiction?
5 lbs (2.27kg)
What is another name for Flame Speed?
Flame Propagation.
A bushing may be used to reduce one pipe size when made of ______.
Steel.
Clause 6.9.10 (a)
Which of the following statements is NOT correct?
- Pressure is exerted in all directions
- Horizontal runs affect pressure
- The shape of the container does not affect pressure
- The volume of the container does not affect pressure
- Horizontal runs affect pressure
What is the minimum distance between a direct-fired propane vaporizer and a propane tank or fill point of a propane tank?
25 feet (7.5m)
A construction heater shall be connected by a hose NOT less than __ “ and NOT longer than __ “ in length.
NO less than 15 feet
NO longer than 75 feet
Clause 6.20.3 (c)
What Clause do you need to conform to with appliances over 400,000Btu.
Clauses in 8.4
On a construction sites, what is required to be used with all propane cylinders larger than 1 lbs propane capicity?
Excess Flow Valve
What must be done to a Field Constucted Chimey prior to being used for venting gas fired appliances.
It must be lined with a approved, correctly sized liner.
A 3” NPS horizontal gas line must be supported every ____ feet.
A 3” NPS horizontal gas line must be supported every 15 feet (4.6m).
Clause 6.3.2
An appliance is constructed so that independed, enclosed passageways connected directly to the appliance supply all of the combustion air and vent the products of combustion directly to the outdoors.
What is this appliance called?
Direct Vent Appliance
What is a Category II Appliance in venting?
An appliance that operates with a NON-postive vent static pressure and a flue loss of less than 17%. This will be hot water tanks and boilers .
What is the standard atmospheric pressure boiling temperature of liquefied natural gas?
-258*F
How would a propane tank that is 50% full be lifted?
Can be lifted by cradling it with wire rope or chain slings.
The unthreaded portion of a piping outlet shall extend ____ “ through a ceiling or wall and ____ “ through a floor.
Clause 6.12.2
- 1” minimum through ceiling or wall
- 2” through a floor
When is a Barometric Damper installed?
When the appliance doesn’t come with one.
What sizing table would you use to size a PE (polyethylene) gas line on 2 psig CH4 (natural gas) installation?
Table A.3 (page 120)
Tubing laid on a rooftop shall be supported ________.
continuously with treated wood and planks.
Clause 6.25.2
What is the Combined Gas Law?
P1 V1 T2 = P2 V2 T1
- P1 = Orginal Pressure
- V1 = Orginal Pressure
- T2 = New Temperature
- P2 = New Pressure
- V2 = New Volume
- T1 = Orginal Temperature
What is Corrugated Metallic Liner installed in a masonry chimney, What is the maximum capacities in the venting tables reduced by?
20%
What is the major components of air?
- Nitrogen 78%
- Oxygen 21%
- Other Gasses 1%
How much propane can be dispensed into a cylinder with a WC of 238.
100 pounds
Water Capacity (42% DIVIDED by 100)
238 lbs (42% / 100) = 100 lbs
A test gauge shall have a minimum diameter of __ “
A test gauge shall have a minimum diameter of 3 “
Clause 6.22.2 (b)
What 2 thing must be done prior to excuting a gas-piping job?
- Permit must be in place first
- Call (Alberta One Call) prior to excavation.
How does a pressure cooker reduce cooking time?
- Increased Pressure
- Increased Temperature
The use of left and right threaded couplers is NOT permittedon a gas piping system.
TRUE or FALSE
TRUE
Clause 6.14.3
When using the lifting lugs to move a propane tank, what is the permitted filling density?
5% Water Capacity
If you have multiple gas firing appliances in the same space , can you use the same draft control device?
Yes you can, as long as you follow the appropriate chart and calculate the size.
What does GVR (general venting rules) C.2.3 state?
Reducing vent connectors - T.V.H (true vertical hieght) must be 10ft or higher.
- 12” or smaller can be reduced one size.
- Over 12” can be reduced 2 sizes.
- Draft Hood Aplliances CAN NOT be smaller than 4”.
- Fan Assited appliances can be smaller than 4”
- Fan Assisted reduction must have table de-rated by 10%
What is the minimum distance between a direct-vent terminal and ground level?
12 inches (300mm)
A 2” NPS welded gas line shall be tested to a pressure of __ psig or __ times maximum operating pressure for ____ minutes.
A 2” NPS welded gas line shall be tested to a pressure of 50 psig or 1.5 times maximum operating pressure for 180 minutes.
The volume of gas required for each appliance shall be determined from _____________ and/or ___________.
the appliance rating plate and/or the manufacturer’s specifications.
Clause 6.4.2
Every hose and hose fitting shall have a minimum pressure rating of ___ psi.
Every hose and hose fitting shall have a minimum pressure rating of 350 psi.
Clause 6.2.9
What does the Density of a substance equal?
Relative Density X density of water
Where can a cylinder not be placed for use on a construction site?
In a stairway
What does GVR (general venting rules) C.2.5 state?
When two or more appliances are connected into a common header, there is increased turbulence. The turbulence will decrease the venting capacity. The venting table must be de-rated by 10%.
Length are in Table C.9 or 1.5ft X diameter.
A dirt pocket shall be installed _________.
on the final drop serving an appliance OTHER than a range, a clothes dryer.
Clause 6.13.1 (a-i)
Basiclly on on furnances
What MUST be attached to a pressure relief valve installed in a propane tank?
A loose-fitting rain cap to prevent rain and snow from entering the valve
When burning gas, what is the significance of the following temperature? 950*F
The ignition temperature of propane
Define : Matter
Anything that has mass and occupies space
Where may Type B vent material only be used for a vent connector?
Type B vent meterial must be when its for the appliance and its chimney or vent when the length of the vent connector exceeds the limits listed in the Table C.9.
Why do must solids and liquids expand when heated?
Molecules move faster and take up more space.
A deffective section of gas piping or tubing may be repaired by a qualified gasfitter.
TRUE or FASLE
FASLE
Must be repaired
Clause 6.14.1
What are 2 products produced from Incomplete Combustion?
- Carbon monoxide 2. Aldehydes
The combustion air ducting is required to terminate how?
within 1 foot above and 2 feet horizontal of the burner level of the largest input appliance.
With venting of pressure control devices, what do you do if there is NO instructions for venting size?
Increase one pipe size for each 50 feet of vent line be used.
What are the 5 increments of the density of water?
- 62.4 lbs/ft3
- 10 lb/gal
- 8.33 lb/US gal
- 1000 Kg/m3
- 1 Kg/L
A piping outlet that is not connected to an appliance shall be terminated by means of what?
Clause 6.12.1
- plugged/capped valve
- a cap or plug compatible with the pipe or tubing employed.
Define : Absolute Pressure
Absolute Pressure is :
Pressure thet include atmospheric pressure
How often MUST a propane cylinder be re-qualified?
Every 10 years from date of manufacture.
What is the pressure, in inches of mercury, exerted by one atmosphere at sea level?
29.92 inches
Describe the function of a Draft Control Device.
- Draft Control Device neutralize the effect of stack action of either a chimney or a vent upon operation of the appliance.
- Ensure the ready escape of the flue gases from the conbustion chamber in the event of no draft or stoppage downstream from the draft hood.
- Prevent backdraft from entering the combustion chamber of the appliance.
What do High Pressure gas systems (above 14” w.c.) require that Low Pressure systems (below 14” w.c.) do not?
System regulator
These regulators have special requirements for atmospheric venting and termination as per code.
Threaded pipe less than 1/2” diameter shall be a minimum wall thickness of ______.
for NATURAL gas, it must be schedule 80.
PROPANE pipe less than 1/2” shall not be used indoors, except a NPS 3/8” branch line that is 25 feet (7m) maximum in length
Clause 6.3.8
List 2 reasons for sulphur being removed (scrubbed) from natural gas that is used for fuel purposes.
- Prevent pipe corrosion
- Prevent acid rain
Which of the following would be an example of a physical change?
- Natural Gas burning
- Steel Rusting
- Lead Melting
- Gas engine producing monoxide
- Lead Melting
What are the 2 functions of a Draft Hood?
- Dilute the air going into the vent (chimney) by 50%. This cools the products of combustion by 150*F-180*F.
- It breaks the Shack Effect in the vent (chimney)
What type of appliance is allowed by Code to be installed in a bathroom?
Direct Appliance
Because when water vapour is admitted into the combustion process, carbonic acid may be formed which will damage the appliance an d venting.
What is the minmum distance betwen a direct-vent terminal and a mechanical air intake?
10 feet (3m)
Nesting of bushings is permitted on low-pressure gas fittings.
TRUE or FALSE
FALSE
Nesting is NEVER allowed
Clause 6.14.2
Which of the following describes a coaxial pipe?
- Type B Vent
- Vent pipe inside an air supply pipe
- Air supply pipe next to a vent pipe
- Seperate vent and air supply pipes that connect to a special fitting
- Vent pipe inside an air supply pipe
Piping or tubing extending from one building to another shall have a shutoff valve located ______
at the exit of the first building and at the point of entry to the second building.
Clause 6.18.8
How many cubic feet of gas are in 1 gallon water?
272 cubic feet / Gallon
With a 2psi gas system, what table do you use to find out reasonable amount of fittings and there equalivent lenght of straight pipe?
Table A.16 (page 145)
How high must a chimney extend above the roof?
A chimney must ;
- Extend above the roof or highest point where it passes by a minimum of 3 feet.
- Must extend 2 feet (600mm) higher than any porition of a building within 10 feet.
What is the range of flammability of s fuel?
The amount of fuel in a fuel/air mixture that will burn.
What is the minimum required distance between a source of ignition on an appliance and floor level in a storage garage?
18 inches (450mm) Clause 4.16.2
Are alterations of draft control devices by the sheet metal worker allowed?
NO
What device has 2 back check valves incorporated into it?
Filler Valve
Separate filler valves have 2 back check valves incorporated into them. One is a metal to metal seat.
What is the other check valve seat?
Neoprene to metal
Who is responsible for the installation and maintenance of piping and equipment up to and including the gas meter?
the gas utility
What is the minimum distance between a direct-vent terminal and a public sidewalk?
7 feet (2.1m)
The sizing for a Fan-Assisted appliance will give a ______ and a ______ capacity.
minimum and maximum
When propane is servicing a one or two dwelling home or row of homes, what distance must the the regulator must be from buiding?
It CANNOT be located more than 3ft (1m) inside from the the point at which propane supply enters the building.
What are the 2 variables in Charles Law?
There is a direct relation between
- Temperature
- Volume
Define Single-acting Barometric Damper
A Single-acting Barometric Damper is a draft control device intended to stabilize the natural draft in an appliance by admitting room air to the venting system. A single-acting barometeric dampner is free to move in the inward direction only, allowing air to enter, but closes in the outward direction to prevent spillage of the flue gases.
Where a commercial appliance may be affected by vibration , a ________ may be used.
hose connection
Clause 6.20.2
What is the relative density of water and air?
Water is 1
Air is 1
What 2 factors influence the state that matter exists in?
- Temperature
- Pressure
What are the 3 most common uses of natural gas (methane)?
- Heating
- Cooking
- Domestic water heating
A swing joint may NOT be installed in a _________.
concealed location.
Clause 6.14.4
What is the calculation for Calculating the amount a material expands or contracts?
Length Change = Original Length X Coefficient of expansion X Temp Change.
What is the recommended grade of horizontal vent connectors?
1/4 per foot up towards the chimney or vent.
Is there a substance that does not expand when or contract when it cools?
No
What is the tare weight of a cylinder?
Weight of the empty cylinder.
How is temperature measured?
Btu
A 2” NPS horizontal gas line must be supported every ____ feet.
10 feet (3m)
Table 6.2 (page 43)
What does GVR (general venting rules) C.2.7 state?
This outlines the need for de-rating the appliance input for high altitude installation.
- All of Alberta is considered High Altitude.
- If appliance is not listed for high altude, it must be de-rated by 10%
How does a direct vent appliance differ from a natural appliance?
- A direct vent appliance is usually vented horizontally through the side wall vent pipe surrounded by the combustion ait pipe.
- The natural draft appliance is usually vented vertically through the roof with a type B vent and the combustion air admitting into the room in which the appliance is installed.
What is problem that happens when the venting restricts the breathing of the regulator?
Maintaining a steady outlet pressure. (Hunting)
What must be done to all exterior vents?
Insulated and Boxed in.
What is the minimum hieght that a B-Vent must be in a venting system?
5 feet
Define : Coefficient of linear expansion?
The amount a material will expand for every degree of temperature change
What does this chemical symbol represent? C3H8
propane
