16 Questions
Who is responsible for opening a natural gas supply valve that has been closed?
Enbridge Gas Distribution representative
What should personnel do at incidents involving suspected faulty natural gas appliances and equipment?
Call Enbridge Gas Distribution representative
What is the typical location of natural gas refueling stations?
Part of a standard public service station
How can a fire or natural gas escape be controlled at a refueling station?
By shutting off the power to the compressor
What is the primary difference between natural gas vehicles and traditional vehicles?
Fuel type
How is natural gas typically stored in vehicles?
As a compressed gas
What is the current trend in natural gas cylinder construction?
Transition to fibreglass wrapping
What is the potential benefit of using activated charcoal in natural gas cylinders?
Lower storage pressure
At what temperature is the natural gas fuel stored in the cylinder at a pressure of 20 700 kPa?
20°C
What is the maximum filling pressure of natural gas cylinders?
24 800 kPa
Where are the natural gas cylinders normally mounted in a car?
In the trunk
What is the capacity of a standard natural gas cylinder?
60 litres
What is the purpose of the master shut-off valve in natural gas vehicles?
To turn off the supply of fuel in case of an accident
What should be done if the valve cannot be reached in an accident?
Keep people and ignition sources away from the escaping gas
What is the purpose of the pressure relief device (PRD) in natural gas cylinders?
To vent natural gas automatically to the atmosphere at a controlled rate
Where should questions and recommendations regarding natural gas incidents be directed?
Special Operations Section, Professional Development and Training Division
Study Notes
Restoring Natural Gas Supply
- Only Enbridge Gas Distribution representatives can open natural gas supply valves that have been closed.
- These representatives enter premises to perform safety checks and restore service to appliances.
Natural Gas Refueling Stations
- Most natural gas vehicles are fueled at public service stations with a separate meter station, compressor, and storage cylinders.
- Each station has emergency instructions, including the location of shutdown switches and control valves.
- Stations can be shut down in an emergency by switching off power to the compressor or shutting off the natural gas supply at the meter or valves.
Natural Gas Vehicles
- Most natural gas vehicles are dual-fueled, capable of running on natural gas or gasoline.
- Natural gas fuel is stored as a compressed gas in cylinders made of steel, steel and aluminum, or fiberglass.
- Cylinders are typically mounted in the trunk, under the frame, or in the interior of vehicles and have a capacity of 60 liters, weighing around 55 kg.
- Cylinders have a maximum filling pressure of 24 800 kPa and store the equivalent of 17 liters of gasoline.
- Larger cylinders are available for larger vehicles, with TTC natural gas buses having 1600-liter cylinders mounted on the roof.
Safety Features
- Master shut-off valves can turn off the fuel supply in case of damage in an accident.
- These valves are usually found on or near the cylinder or under the hood.
- If the valve cannot be reached, keep people and ignition sources away from the escaping gas.
- Natural gas cylinders contain compressed vapor only and are equipped with pressure relief devices (burst discs) that vent gas to the atmosphere in case of an emergency.
- Burst discs do not reset, and the entire contents of the venting cylinder will be exhausted to the atmosphere.
Special Operations
- Questions and recommendations regarding natural gas incidents should be directed to the Special Operations Section, Professional Development and Training Division.
Learn about the procedures for restoring natural gas supply to premises or appliances, including safety checks and repairs. Understand the roles of Enbridge Gas Distribution representatives and TFS personnel.
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