SOP 420 Flammable Vapor Emergencies

Question 1

What hazards do flammable gas present?

Answer 1

Asphyxiation hazard and explosion and fire hazard.

Question 2

Specific properties of Natural Gas

Answer 2

Vapor Density of 0.6
LEL 3.8%
UEL 17%

Question 3

Specific properties of Propane

Answer 3

Vapor Density of 1.5
LEL 2.1%
UEL 9.5%

Question 4

Considerations for flammable vapor emergencies

Answer 4

Recognition and identification is crucial. Create a hot zone and stage away from scene

Question 5

When is the area considered stable?

Answer 5

Not until the LEL is below 10%.

Question 6

When should we repeat monitoring during the incident?

Answer 6

Every 15-20 minutes.

Question 7

What is a good tactic for interior gas and vapor leaks?

Answer 7

Ventilation and time to see if the leak returns. Advise homeowner to seek professional appliance assistance

Question 8

Exterior Specific operations

Answer 8

Work with excel. Dont try to clamp or plug an source line. Can protect excel workers with handline in full PPE and connected to a water source. Do not enter trench or deploy water into trench unless a fire/explosion and a rescue is needed. Can disperse vapors after consult with command and excel