HazMat Ops Bulletin 5 Flashcards
When gas is shut off to a building, who do you contact?
Communications. They then contact Washington gas
Who re lights pilot lights?
Contractor
Do natural gas fires outside get extinguished?
No
High pressure gas lines are how many psi?
20
Low pressure gas lines just ahead of the meter that have been reduced by a gas regulator are how many psi?
1/5 psi
If gas service pipe through a wall exceeds —– ft before reaching the meter, an additional stopcock is needed.
20 ft
Stopcocks are turned of by turning in which direction?
Clockwise or counter clockwise 90 deg to pipe
Fire valve locations and definition
Located outside large buildings, schools, etc.
raised operating stem inside a 2 1/2” pipe approx 12” above grade. Has a 5 sided but on top.
How do you operate a fire valve?
Using a fire plug wrench, turn but counter clockwise, then turn the operating head 1/4 turn clockwise
Curb stopcock description
Box at ground level between the curb and property line in front of buildings where gas is supplied at high pressure.
How is the curb stopcock operated?
Remove box cover, turn valve 1/4 turn either way with t-handle
Curb gate valve description and operation.
Has a hand wheel or 2” square operating head. Turns clockwise 6-20 turns depending on pipe size.
Which type of gas valve can be used in lieu of a fire valve with written approval from the DC fire marshal?
Curb gate valve
System pressure for Washington gas transmission lines
60-300 psi
System pressure for distribution lines
1/5 to 60 psi
