TB Emergencies 2 -- Natural Gas Flashcards
What is the 1st priority order of gas valve shutdown?
1) appliance valve (1/4 valve)
What is the 2nd priority order of gas valve shutdown?
2) Meter (meter valve, master meter, gas riser valves) – Note: avoid shutting master meter, it is preferable to shut the gas suppy at the applicance valve or interior gas riser valve as close to the leak as possible – these are 1/4 valves
What is the 3rd priority order of gas valve shutdown?
3) Head of service valve (building service valve) – most of these are 1/4 valves
What is the 4th priority order of gas valve shutdown?
4) Exterior gas riser valve (1/4 turn valve)
What is the 5th priority order of gas valve shutdown? Where is it found?
5) Curb valve – usually found on the sidewalk side of the curb – in most cases, 1/4 turn clockwise
What is the 6th priority order of gas valve shutdown?
6) Street valve (a.k.a. line, main, or isolation valve)
Where are gas riser valves typically found?
Basement ceiling
When using a curb valve to shut down the gas supply and a white valve is found, what does this mean?
white = plastic valve and plastic valve stops are easily broken by excess force
Some older curb valves are gated and will require multiple turns to close. If 1/4 turn does not shut the gas off, continue to turn the valve until resistance is met. This may occur between _________ & _________ full turns.
7 1/2 & 15
Do not turn an older curb valve more than how many times?
15
Do not operate street valves except under extreme cirmustances and only upon direction of the _________________ after consultation with the ________________.
Fire Department Incident Commander/Utility Representative Supervisor
Are non-FDNY issued flashlights, FDNY thermal imagining cameras, and department fans intrinsically safe?
No
What is a Star Valve?
old type of gas valve that may be found between the head of service valve and the gas meter. It is rarely found today, is unreliable and should not be used
At a major indoor gas leak, how many exposures on both sides of the original occupancy do you check?
3 on each side
Can FDNY members remove sewer manhole covers?
Yes, with the approval of an on-scene Chief Offcer
Can FDNY members remove Electric Manhole covers?
Yes, when requested by a utility company gas representative on the scene and approved by an on-scene Chief Officer
How should round manhole covers be removed?
by 2 firefighters utilizing manhole hooks. battalion vehiclews carry two manhole hooks for use in removing electric manhole covers
Can FDNY members pull rectangular or square electric manhole covers?
No
Can FDNY members pull electric manhole covers if there is a manhole fire in the area or if smoke or arcing is observed in an electric manhole or transformer vault?
No
When turned on in fresh air, the TIFF gas meter should be set to click how?
Slowly
When is the MSA Altair digital gas meter first set to sound an alarm indoors?
At 10% of the Lower Explosive Limit (the FDNY indoor action level)
100% of the lower explosive limit (LEL) equals how much gas in the air?
5%
What is the outdoor FDNY action level?
20% of the Lower Explosive Limit (LEL) – device sounds a different alarm then the indoor alarm
What does a series of crosses under the COMB/EX icon indicate on the MSA Altair digitial gas meter?
the atmosphere is above 100% Lower Explosive Limit (LEL)
What is the low oxygen and high oxygen alarm level on the MSA Altair Digital Gas Meter?
Low = 19.5%, High = 23.0%
What does a series of crosses (+++) across the screen under the O2 icon indicate?
that the atmosphere is above 25% oxygen
When the MSA Altair Digital Gas Meter is emitting a vibrating pulse and flashing a green LED light every 30 seconds, what does that mean?
the meter is activated and operational
What gas is the MSA Altair Digitial Gas Meter calibrated to detect?
Methane
