16 Questions
What is the primary concern when extinguishing a natural gas fire?
Preventing the spread of natural gas to other areas
Who may attempt to stop the natural gas flow to an entire building?
TFS personnel by closing the natural gas meter supply valve
When should TFS personnel shut off the natural gas flow at a single appliance?
When the fire is isolated to a single appliance
Why should consideration be taken when turning off the natural gas flow to commercial or industrial buildings?
It may seriously interrupt important production processes
Who has access to underground natural gas supply valves to buildings?
Enbridge Gas Distribution representatives
What should personnel do before shutting off the natural gas flow to a single appliance?
Spray water fog on any surrounding combustibles and/or exposures
What should be checked for after extinguishing a natural gas fire?
Natural gas accumulations in nearby buildings
When should the natural gas supply be shut off in a building that is not on fire?
If it appears that natural gas piping or the meter installation is going to be endangered
What should TFS personnel do if they suspect natural gas/methane is present in a confined space?
Do not enter the confined space
Why should water not be used in an excavation hole?
It may weaken the site's integrity
Who should stop the flow of a broken natural gas pipe?
Trained and equipped Enbridge Gas Distribution personnel
What is the limit of TFS personnel's control of escaping natural gas from damaged pipes?
Turning off the natural gas at supply valves only
Who should operate natural gas valves installed on system mains, stations and commercial/industrial service lines?
Trained and equipped Enbridge Gas Distribution personnel
Where are natural gas system main, station and commercial/industrial valves installed?
At locations in accordance with the following: Distribution Mains (below ground), Regulator Stations (above ground), Commercial/industrial service lines (above and below ground)
Who may close residential service line shut-off valves?
TFS personnel only if there is immediate risk of personal/public safety or property damage
What should be done if a valve is closed?
It must NOT be re-opened by anyone other than Enbridge Gas Distribution personnel
Study Notes
Control of Natural Gas Fires
- TFS personnel should not extinguish a natural gas fire unless the natural gas flow or leak can be stopped by closing natural gas supply valves before or immediately after extinguishment of the fire to prevent the spread of natural gas to other areas, which can lead to explosion or rapid fire.
Stopping Natural Gas Flow
- The natural gas flow to an entire building can be stopped by closing the natural gas meter supply valve.
- Readily accessible natural gas supply valves can be closed by TFS personnel to stop the flow of natural gas when safe to do so.
- Consideration should be taken when turning off the natural gas flow to commercial or industrial buildings, as it may interrupt important production processes and create further hazards.
- Underground natural gas supply valves to buildings may only be accessible to Enbridge Gas Distribution representatives.
Isolated Fires and Precautions
- If the fire is isolated to a single appliance, personnel should shut off the natural gas flow at the appliance supply valve.
- Personnel should spray water fog on any surrounding combustibles and/or exposures if in danger of igniting before natural gas flow can be stopped.
- It is essential to check for natural gas accumulations in nearby buildings, sewers, etc., using natural gas monitoring instruments.
Natural Gas/Methane in Confined Spaces
- TFS personnel should not enter a confined space, maintenance hole, sewer, vault, or excavation if natural gas/methane is suspected to be present.
- The Incident Commander shall ensure personnel do not use water in an excavation hole, as it can fill the hole and weaken the site's integrity, making entry for repair more hazardous for utility personnel.
Damaged Natural Gas Pipelines, Meters, and Pressure Regulators
- TFS personnel should not attempt to stop the flow of broken natural gas pipes, meters, or pressure regulators; instead, they may assist trained and equipped Enbridge Gas Distribution personnel.
- The hazards associated with plugging/capping metal pipe and crimping/clamping of plastic pipe can only be eliminated by trained and equipped Enbridge Gas Distribution personnel.
- TFS personnel should only turn off the natural gas at supply valves and not operate any underground or aboveground regulator stations or commercial/industrial service line valves.
Learn about the procedures for controlling natural gas fires, including stopping the gas flow and extinguishing the flames, to prevent hazardous situations.
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