Gas Flashcards
The most common Manifold is
3.5” of water colum
What are the two things that dictate the state of the matter
Pressure and temperature
Transmission pipeline
Plant to utility
Distribution piping
Utility to customers
Production pipeline
Well head to plant
What is added to natural gas to give the odour
Ethyl Mercaptan
At what rate is Ethyl Mercaptan added ?
Ethyl Mercaptan is added at a rate of 1pound per 1 million cubic feet in natural gas
What is the maximum allowable pressure into single family home for propane in Alberta
2 psi (56” w.c)
What is the volume expansion from liquid to vapour for propane
270 times out of
What is the volume expansion from liquid to vapour for water
1700 times
Specs for appliances in garage
Must be at least 18” (450mm) above floor level for residential and 54” (1400mm) for repairs garage
Can heat exchanger in residential units be repaired
It can only be repaired temporarily upon approval and replaced
Can heat exchanger be repaired in a commercial unit
Can be repaired and need approval
What is considered to be high altitude elevation
Between 2000feet to 4500feet. Reduction of 10% then 4% every 1000 feet
What are pipe dope and teflon tape considered to be
Considered to be lubricants
Maximum high limit switch by code
250F
Range of flammability for propane
2.3% to 9.5%
What happen in a diaphragm gas valve when the relief port is blocked
Gas valve will remain closed
What position does the actuator diaphragm gas valve end up if the diaphragm ruptures.
The actuator remain in the open position.
On a 66’ tall pipe with a pressure of 65psi at bottom. What would be the pressure at the top.
.433 psi. Pressure of water for 1 feet
66 x .433 psi = at top lost
28.578 = loss at top
65 - 28.578 = 36.42 psi at top
What is the most typical material to supply mid efficient appliances combustion air
Flex with approved label on it.
How far away minimum must a combustion air intake terminate from a car park
36” away
What distance from ground level minimum must a combustion air vent terminate
12”
What type of venting is used for high efficient oil furnace
The venting is L
Leak limiting device on regulator allow for maximum of
Propane
Natural gas
1 cubic feet for propane
2.5 cubic feet natural gas
What is the specific name of the support for vertical riser pipe
Riser clamp
What is the penalty apply for chimney liner
20% penalty
On gas line at pressure above 2psi what must be done in consideration of fittings
Equivalent line resistance need to be added
How do you identify the gasket in a compression fitting or a grooved pipe fitting
Color Coating
Propane can be filled up to ?
80% of volume or 42% of water capacity
How many cubic feet of propane can you get from 1 imperial gallon
44 cubic feet
Hydrostatic pressure valve range
375 psig (2500kpa) to 500psig (3500kpa)
Maximum amount of support legs on horizontal propane tank
2 maximum
What type of valve is used on propane tank for liquid withdrawal
Excess flow valve
How far does a 7500L have to be from a masonry wall
10ft
Clearance from adjacent propane tank on residential setting
3ft or 1m
What material is not allowed for propane liquid
Polyethylene
What is over tightening a gas line called
Creeping
What is allowed for sched 80 and 40 over 125psig pressure
Sched 80 for threaded
Sched 40 for welded
