Year 4 Flashcards
The largest heat exchanger in a steam plant is the:
condensor
To prevent misting in the steam boiler, the steam drum is equipped with what?
Steam separator
What principle does a steam injector operate on?
Venturi principle
A steam boiler must have 2 means of feedwater makeup if over how many square feet?
500 square feet
What is the name of the device that controls super-heated steam?
Attemperator
What is the last heating device before feedwater enters the boiler?
Economizer
The exhaust steam line from a turbine requires what to clean the steam?
Oil separator
What prevents a boiler from collapsing when being dumped?
Manual air vent
Carryover in a steam boiler can cause what?
Water hammer
In a steam plant, what component use HP exhaust steam?
Closed feedwater heater
Name the two main types of steam plants
Condensing/non-condensing
What does a skimmer do in the steam drum?
Rid boil water of suspended particles and oil
The 2 valves on a boiler blow-off are what type?
Angle globe and quick opening
Using a series of flash tanks is referred to as what?
Cascading
A steam plant that exhausts steam to the atmosphere is called what?
Non-condensing
HTHW systems operate above what temperature and pressure?
250 degrees F/160 PSI
Which is the simplest type of cooling tower?
Natural draft
What is the minimum size of a blowoff line from a boiler over 100ft^2
1 inch
Which is the most common type of heat exchanger?
Tube and shell
What 3 factors affect the efficiency of a cooling tower?
Contact service, contact time, relative humidity
A piping system must be registered with ABSA is over what volume?
.5 cubic metres
How many pressure gauges should be used when pressure testing?
2
What device cleans the fireside of a watertube HP steamboiler?
Sootblowers
HTHW generators differ from watertube boilers in what way?
No steam drum
HTHW boiler construction is governed under what?
ASME Section 1
Coal ground into a fine powder is called what?
Pulverized
What is the duct between a boiler and the stack?
Breeching
What is the minimum sizing of feedwater line on a boiler over 100ft^2?
3/4 inch
What component is associated with a PSV?
Drip pan elbow
What must be done to a horizontal discharge pipe from a PSV?
Slash it at 45 degrees
A deaerator must be how high above the feedwater pump?
30 feet
A blow-off vessel must withstand what % of the boiler pressure?
30% up to 300 PSI
A fired pressure vessel is covered under what section of ASME?
Section 1
Where does exhaust steam come from?
Turbine
A boiler with over 500ft^2 of heating surface requires 2:
PSV’s/Feedwater makeup
What is the diameter of a flash leg?
6 inches or less
Flue gases travel through the firebox of a natural draft boiler via:
Convection currents
What type of fan creates a positive pressure inside a boiler furnace?
Forced draft
What type of fan creates a negative pressure inside a boiler furnace?
Induced draft
A boiler with both an induced and forced draft fan is referred to as what?
Balanced draft
Gases are removed from feedwater via the:
Deaerator
If no water is visable in a boiler sightglass what should the operator do?
Shut it down
When water particles are entrained in steam leaving the boiler, this is referred to as what?
Priming
How do you properly align the 3 pieces of a true Y?
Quarter and centre punch the pieces
How are steel tank bottoms protected from corrosion?
Impressed cathodic protection
Corrosion, due to electrolysis is caused by loss of what?
Electrons
Boyles law states what?
As pressure increases, volume decreases
Charles law states what?
As temperature increases, volume increases
What heating plant uses the earth as a heating source?
Geothermal
What type of water tube boiler has 3 drums?
A configuration
Which component removes large objects when treating wastewater?
Screens
When treating wastewater, what treatment removes phosphorous from the waste water?
Tertiary treatment
Hardwater causes what problem in a boiler?
Scaling
Concentrations of solids in boiler water are controlled by what?
Boiler blowdown
Reaming of medical tubing is recommended, true or false?
False
Solar heating systems relying on mechanical equipment for heat transfer are called:
Active solar systems
Medium temperature hydronic systems operate within what temperature range?
250 degrees F - 350 degrees F
What are the advantages of a HTHW heating over steam heating?
Less water treatment
less corrosion
What is one advantage of an active solar heating system over a passive system?
It is more compact
Where is the hotwell located in a boiler feedwater system?
Between the softener and the deaerator
What type of compressor uses a rotating action to compress refrigerant?
Rotary compressor
What is the biggest disadvantage of the DDCV venting system?
It is inefficient
Flash tanks produce what?
Flash steam
Helical gear compressors have 2 mating:
Grooved rotors
A cooling tower with a fan is called:
Mechanical
The driving force for turbine pumps is:
Steam
Tubes in a ‘hex’ are supported by what?
Baffles
Deposits in ‘hex’ is called what?
Fouling
Who enforces Alberta’s boiler regulations?
ABSA
Condensate from the condenser re-enters the feedwater system at the:
Hotwell
Boilers employ moving furnace grates use what fuel?
Solid fuel
Smelt from a recovery boiler goes where?
Dissolving tank
The steel boilers are rated by:
Steel boiler institute
Regenerative air heaters transfers heat from the flue gases to combustion air using:
Large metal wheel
Coal-fired power plants are a major source of:
Wastewater
What uses gravity to settle out large particulates in power plants?
Ash ponds
One of the largest contributors of food processing wastewater is:
The dairy industry
2 types of oil separators are:
API and Parallel plate separator
A HTHW generator are designed for what systems?
Heating and processing systems
The removal of grit in wastewater treatment is important to prevent what?
Silting and pump damage
The most common form of mine wastewater treatment is the use of what?
Tailings ponds
What device is an electric component that extracts heat from one place and transfers it to another?
Heat pump
What component prevents liquid refrigeration from going to the compressor?
The accumulator
What device captures heat from building exhaust air and transfers it to fresh air entering the building?
HRV
What type of a HRV system can cause an air pressure difference between the inside and outside of a building?
Unbalanced system
What standard is used for medical gas installation?
CSA Z7396.1
Labels for oxygen gas must be what colour?
Green lettering on a white background
Labels for medical gas must be a maximum of how far apart?
20 feet
The maximum horizontal support spacing for 1/2” medical piping is how far?
Every 6 feet
The minimum size of pipe used in a medical gas system is what size?
1/2 inches
The outlets of medical gas terminal units are designed to prevent what?
Cross-connections
A minimum of how many brazed joints must be inspected per medical gas installation?
3 joints
Because medical gas is deemed to be a critical installation and the source of supply will require what?
Redundances
What is used to supply gas for smaller installations or as reserve supply for larger installations?
High pressure gas cylinders
What system is only used to remove the exhaled anaesthetic gas from a patient?
96.AN AGSS System
What is the minimum pressure test for medical gas piping?
150 PSI
All defective components on a medical gas system shall be:
Repaired immediately
Which geothermal heating system draws water up through a well directly to a heat exchanger where heat is extracted?
Open loop system
Which geothermal heat exchanger is a series of loops placed in a body of water?
Pond heat exchanger
In what geothermal system is the refrigerant used in the ground heat exchanger, instead of an antifreeze solution?
DX system
Which geothermal system is employed where space isn’t limited and consists of 2 pipes placed side-by-side in a trench? (3 to 10m)
Horizontal closed loop system
What separates the interior and exterior environments of a building?
Building envelope
What is the term for radiation that is reflected from the earths surface?
Albedo
The 2 types of solar space heating are:
Active and passive
A combination of active and passive solar heating systems are called:
Hybrid systems
Evacuated tube collectors are used for hydronic heating or what else?
Domestic hot water heating
There are over how many designated trades and occupations in Alberta?
50
What percent of the apprentices’ training takes place on the job?
80%
The Alberta Apprenticeship and Industry Training (AIT) Board is appointed by the Lieutenant Governor and consists of how many members?
A chair and 12 members
The industry accepted standard for excellence in a trade in Canada is:
The Red Seal
Industry practitioners are people that work where?
Work hands on in the trade
What is the foundation document for designing the red seal exam?
The NOA
What is one disadvantage of a wet pipe sprinkler system?
Possible freezing
A dry pipe sprinkle system is charged with what?
Air
New hydraulic piping requires what prior to use?
Flushing and pickling
Compressed gases in a hydraulic system cause what?
Foaming
Where is the automatic drip ball valve located on a fire system?
Between siamese connection and check valve
A new medical gas system is pressure tested with what gas?
Nitrogen
What boiler requires a superheater?
A power boiler
What is maximum size blow-off piping from a steam boiler with over 100 square feet heating surface?
1 inch
Try cocks are used for what purpose?
Verify water level
Closed feedwater heaters are what type?
Tube and shell
What is the maximum water temperature in a deaerator?
212 degrees F
A heat exchanger with the heating medium in the tubes is called a:
Immersion coil
This prevents negative pressure in the building:
Make-up air unit
What is another name for double back elbow?
Lobster-back
On the jobsite, who receives and checks materials?
QCI
On the jobsite, who looks after the welders?
Site superintendent
On the job site, who does the QCM work for?
The company doing the piping
What is the ASME code covering piping attached to power boiler?
B31.1
What mechanism, in solid fuel boilers, extinguishes the fire if water level is low?
Fusable plug
Try cocks for a boiler are attached to what?
Water column
Which is the most popular steel package boiler?
Scotch marine
What is the standard size of a sprinkler head?
1/2 inch
Sprinkler heads are always open on what system?
Deluge
What is roughing?
Fine rusting
The mixing of hydraulic fluids can cause what?
A gummy deposit
75% of fire systems are what type?
Wet
What should the range on a pressure test gauge be?
1 1/2 to 4 times working pressure
What device prevents flashback in a pipe?
Flame arrestor
Class I standpipes can be used by who?
Trained professionals
The requirements set out for standpipe systems are found in:
NFPA #25
A boiler with the furnace outside the shell and surrounded by brickwork is what type?
External furnace
What must be the side clearances when installing a LP boiler?
18 inches
What is one of the most common problems with a new steam or hydronic heating system?
Improper cleaning of pipes
The minimum length of a cooling leg from a heating coil to a steam trap should be:
5 feet
