SO-13 NATURAL GAS LEAKS AND EMERGENCIES Flashcards
Tests have shown that persons breathing concentrations of _____ percent natural gas mixed with air have suffered no ill effects.
25
Natural gas is only about _____ percent as heavy as air.
65
The odorant of natural gas is noticeable when there is _____ percent gas present in a given volume of air.
less than 1
Flammability limits of natural gas?
5 to 15%
The ignition point of natural gas is around:
1100-1200 degree.
Put water on burning nautral gas?
No, only to protect.
Unless to save a life. In this case, use dry chem at base and wet area around to prevent re-ignition.
All personnel working in vicinity of known or suspected gas leak shall wear:
full PPE with SCBA.
All personnel working within ignitable atompshere shall be:
- in PPE, on air
- covered by manned, charged protective hose line
If gas is burning outside, what valves can you turn off?
Above ground. ONG should shut off any in street or underground.
When the fuel supply has been shut off and the fire extinguished, continue to:
treat the incident as a gas leak until monitoring devices determine that there is no gas accumulation present.
What the magic distance for natural gas?
200’ burning or not, personnel and apparatus
Who will enter structures with suspected gas leaks and with what?
- One officer and one FF
- Intrinsically safe flashlights and radios
- combustible gas meter
- hand tools for forcible entry and shutting valves
Procedure for making entry to structures with gas leak?
Shut off above ground valves only
Shut off open flame devices operating manual controls
Evacuate any occupants
Don’t flip any switches
Ventilate
Remaining personnel in full PPE SCBA (not on air) inside apparatus
What is the threshold for pulling out of structure with gas leak?
30% LEL
