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The hazard when natural gas replaces the air in an enclosed space correct answers Suffocation
can occur because of the lack of oxygen
How air in a room is displaced with natural gas correct answers The air in the room will be
displaced from the top downward
A characteristic of natural gas correct answers It is odorless
The ignition point of natural gas correct answers 1100 degree - 1200 degree F.
The limit of flammability of natural gas correct answers Gas-in-air mixture of approximately 5%
- 15% or 4% - 14% for NIPSCO
The relationship of specific gravity of natural gas to air correct answers it will rise
The three requirements for gas combustion correct answers fuel, Oxygen, Ignition Source
The chemical that is added to natural gas to aid in leak detection correct answers Mercaptan
The path natural gas leaks tend to take correct answers It will seek the path of least resistance in
developing its pattern
Factors indicating a gas leak correct answers dead vegetation, soil condition
The most common indicator of a natural gas leak correct answers Odor, Vegetation, insects,
Fungus-like growth, sound, meter loss, Water bubbling
An important consideration to preventing gas fueled fires correct answers Gas or electric
Welding or cutting may not be preformed on pipe or on pipe components that contain a
combustible mixture of gas and air in the area of work, post warning signs, where appropriate
Some factors that influencing gas leakage patterns correct answers Soul type, line pressure, leak
size, depth of cover, Influencing of water content in soul atmosphere, variations in soil
compaction, Frost
The way to determine a dispersion area during a leak investigation correct answers gas-in-air
readings in at least four 90 degree areas from the suspected leak
The CFR 49 description of an Abnormal Operating Condition correct answers Condition
identified by the operator that may indicate a malfunction of a component or deviation from
normal operations that may (a) Indicate a condition exceeding design limits or (b) Result in a
hazard to persons, property, or the environment