Natural Gas Emergency Flashcards
What is gas company that serves Portland fire?
Northwest Natural Gas Company
When approaching gas call be __ wind
Upwind
Restrict vehicle and pedestrian traffic within one block or ___ feet
300
Withdraw from structure when natural gas levels reach __% volume. A reading of “20” on air monitor
1
Natural gas LEL and flammable range
5% and 5-15%
Do not bring ___ into hot zone
Cell phone
Only ___ can restore gas service
NW natural
Natural gas will flow down the path of ___
Least resistance
It is especially important to check ___ (where gas piping usually enters the building)
Basements
Upper areas are also important to check because natural gas is lighter than air with a vapor density of
.6
Three types of gas pipe found in Portland.
Steel, direct buried polyethylene, and poly pipe inserted in a casing
A majority of new NW Natural utilize this
Poly pipe by itself
When __pipe is damaged escaping gas can build up static charge, igniting the escaping gas
Poly
Damage to __ pipe will usually be localized and generally won’t be transmitted to adjacent structures
Poly
Used for transmission-pressure gas pipelines 50-80psi, standard pressure <50 psi. When damaged it will electrically ground itself to the soil, eliminating the danger of ignition from static electricity build up
Steel