SOP 420 Flammable Vapor Emergencies

Question 1

What are the properties of Natural Gas?

Answer 1

• Vapor Density: .6%
• LEL: 3.8%
• UEL: 17%

Question 2

What are the properties of Propane?

Answer 2

• Vapor Density: 1.5%
• LEL: 2.1%
• UEL: 9.5%

Question 3

When is an area considered stable?

Answer 3

LEL below 10%

Question 4

Monitoring should be repeated how often to establish the hot zone?

Answer 4

15-20 minutes

Question 5

What size hand line should be staffed to provide protection for Xcel employees?

Answer 5

• 1.5” for residential feeders
• 2.5” for commercial feeders

Question 6

A scene time of greater that what is considered a strain on the District’s SOC? What is collected by the IC in this circumstance?

Answer 6

• 60 minutes
• Contact information for all parties on scene to assist with billing considerations by the DC of operations.