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Background:
Article 3.2.7.5 of the 1990 OBC requires emergency power systems to conform to CAN/CSA C282. Most emergency power systems have been either diesel driven emergency generators or battery packs. Consumers Gas has obtained a BMEC authorization (#96-05-204) for a natural gas powered emergency generator system that is deemed to be equivalent to the requirements of CAN/CSA C282.
Acronyms:
CNG - compressed natural gas
ESP - emergency standby power
VRA - vehicle refuelling appliance
How It Works:
Natural gas is normally available to the gas- powered emergency electrical generator. In addition, the natural gas is supplied to a VRA. The VRA pumps the natural gas, at a higher pressure, to store it in a bank of CNG storage tanks.In an emergency, the normal gas supply may be cut off. In such case, the natural gas which is stored in the CNG storage tanks is fed to the gas-powered emergency electrical generator via a pressure regulator. The pressure regulator reduces the natural gas pressure to normal levels.
Schematic:
If the operating pressure in the high pressure piping zone is over 413kPa, the VRA and the CNG storage tanks have to be outside of the building or on the roof of the building.
Date: June 27, 1996 - REVISED
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