BOOK 29 Truck Operations Manual- GAS UTILITIES Flashcards
The common odorant is a ________/ ________ mix, which is used in solution of one pint per million cubic feet of gas.
Mercapitan/ thiophane
Natural gas is ______ than air. (Weight)
Lighter
Natural gas also has an ignition temperature of ____ degrees, and has a flammable range between ___ and ___ percent.
1100 degrees
4 and 14 percent
Transmission lines maintain pressures up to ____ psi and use pressure booster compressor stations, at specific intervals, to maintain appropriate flow and pressures.
1,000 psi
Transmission lines bring natural gas into the Southern California area and vary in diameter from ___ to ___ inches.
12 - 36 “
The gas is carried by service lines, as medium pressure, which normally does not exceed ___ psi.
60 psi
At the service meter (Meter Set Assembly), the pressure is reduced to a low pressure (approximately ___ psi.).
1/3 psi
What color plastic pipes can be found carrying natural gas in new installs and older installs?
New- YELLOW
Older- pink (salmon) or orange
What does MSA stand for?
Meter set assembly
What are the 3 types of MSAs?
Residential
Industrial
Multiple gas meter
A metal ring on the stopcock valve indicates what?
A branch service
A _______ on the stopcock valve indicates that the service line is a plastic pipe inserted inside an older metal pipe.
Flat washer
A band on the stopcock valve indicates?
The service line is plastic
a flat circular device called a “regulator” that reduces medium gas pressure (up to ___ psi) to a relatively low level of approximately ___ psi.
60 psi
1/3 psi
What letter marks the location where the service line passes beneath the curb and indicates which side of the building the MSA is located.
G
