Gas Fundamentals Flashcards
What did natural gas evolve from
Prehistoric plants and animals
Where are most of Canada’s natural gas reserves
Western region
Name three things that LPGs are used for
Feedstock
Fuel
Processing materials
What is the main fuel gas used today
Natural gas
Exploration for oil and gas is conducted in areas known as?
Sedimentary basins
What are three methods of identifying drilling sites for oil and gas ?
Aerial photography, magnetometer, and gravity surveys
Surface studies of rock outcroppings
Seismography
Finding oil and gas is always guranteed using the methods they use?
True or false
False
Name two ways to remove water from gas
Absorbtion and adsorption
Name three primary processing systems used in an oil absorption plant
Recovery
Rejection
Separation
In cryogenics what causes cooling and condensing of the process gas
Pressure reduction
What are the operating pressures for transmission and distribution lines
300-1500 psi
What is the approximate height that aircraft’s fly at to monitor pipelines
160 ft (48.8m)
What is the name of the odorant that is added to natural gas
Ethyl mercaptin
What would happen if you burned gas containing sulphur ?
Produces acid rain and becomes corrosive
What is the rate at which odorant is added to natural gas
1ib per 1 million cubic feet
What is the rate at which odorant is added to propane
1 litre per 10000 litres
As a gasfitter your responsibility lies upstream or downstream of the meter
Downstream
What is the approximate diameter of the salt caverns located just outside of fort sask
230ft (70m)
What temperature does natural gas boil
-258 degrees F ( -161 degrees C)
How is manufactured gas produced
Passing steam over heated coals
Name for LPGs that can be obtained from oil and gas wells
Methane
Butane
Ethane
Propane
Name the essential parts of a fractionation system
Tower
Condensor
Reboiler
Reflux equiptment
What is the setting of a high pressure regulator for a residential propane distribution system
5-10 psi
What is the setting of a low pressure regulator for a residential propane distribution system
11-14” WC
What is the gasfitters responsibility on a residential propane distribution system
Downstream of the first stage regulator
What are the three fundamentals of safety that the code book addresses
Prevent explosion due to escape of gas
Prevent overheating of combustible portions of the building
Prevent the escape of noxious or hazardous combustion products into occupied quarters
What are the three classifications of standatas
Information bulletins
Director interpretations
Directors rulings
How many annex’s are in the B149.1 code book
9
What clause in the code book references where the code does not apply
Clause 1.2 in scope
What section of the code does installers responsibilities fall
Section 4
If the manufactures certified installation instructions conflict with the code which one shall prevail
The code shall prevail unless the installer has written approval from the authority having jurisdiction (SCO)
The last person who works on a gas fired appliance is considered the installer
True or false
True
When converting an appliance, you must inform the owner in writing on how to avoid activating former fuel
True or false
True
It is part of your job to work on and service gas meters and service regulator for natural gas ?
No unless employed or authorized by a utility company
What is the maximum voltage of electrical components you can work on as a class b gasfitter
150 volts ac and 1 amp current draw
When does B149.1 gas code apply to mobile homes
When it is on a permanent foundation or has structural alterations that would no longer class it as mobile
What is the minimum service clearance for a gas fired appliance
2 feet (24”)
What is the clearance between an appliance and the edge of a roof
6 Feet 4.14.6
What is the clearance off the ground for an appliance installed in a residential or storage garage
18” 450mm
What is the clearance off the ground for an appliance installed in a repair garage
54” (1400 mm)
Residential heat exchangers that are defective can be repaired true or false ?
False unless temporarily approved by safety codes officer
Another term for flame speed is?
Flame propagation
What does MBH stand for
Thousands of BTUs per hour
What does mmbh stand for
Millions of BTUs per hour
What is the standard temperature and pressure for which comparisons are made
60 degrees F (14.7psia)
A mixture is two or more types of atoms in solution without a definite ratio.
True or False?
True
Natural gas, also known as methane, it is made of carbon and hydrogen in every molecule. What is the chemical formula?
CH4
There are two factors that influence the state in which matter exists, they are?
Pressure and temperature
Matter can exist in four states, what are they?
Solids
Liquids
Vapor’s
Plasma
It can be proven that when subjected to a higher pressure the boiling point of water decreases. True or False?
False
Natural gas is not an LPG because it requires an extremely low temperature or an excessively high pressure to cause it to turn to a liquid. True or False?
True
At what temperature does propane change from a liquid to a vapour?
-44F or -42c
When Propane liquid boils it expands to________ times its original volume
270
If one imperial gallon (imp gal) of water was weighed it would be how many pounds
10 pounds
One cubic foot of water weighs how many pounds?
62.4
How many Btu’s are required to raise the temperature of 110 lbs of water 120° F?
Mass x Specific heat x Delta T 110 x 1 x 120 = 13’200 BTU’s
What is the flame temperature for the following gasses
Propane
Natural gas
Butane
Propane 3500 degrees F
Natural gas 3350 degrees F
Butane 3450 degrees F
The range of flammability is based on an air/gas mixture in which the air consists of approximately 20% oxygen, 80% nitrogen and other gases, what are the limits of Natural Gas? What about propane?
5% to 15%
2.3 to 9.5%
What are the three mandatory items to achieve combustion
Heat, fuel, oxygen
A reduced yellow flame is an indication of not enough _______________ air.
Primary
What percentage of Carbon Monoxide in air is allowable for an exposure of 8
hours?
0.005% or 50 parts per million
What is the liquefaction ratio (cubic feet/gal) for Commercial Propane?
43.6
