Dunkirk DCBF-125 - Page 56

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• METRIC GAS METERS
Natural Gas
MBH =
127,116 x cu meters
Seconds
For example: Gas Meter measures 0.1 cubic Meters in 100
seconds
MBH =
127,116 x 0.1
= 127 MBH
100
Propane Gas (LP)
MBH =
383,482 x cu meters
Seconds
• NATIONAL BOARD OF BOILER AND PRESSURE VESSEL
INSPECTORS - Group composed of boiler and pressure
vessel inspectors representing states, cities and provinces

• PRESSURE TEST - Operation performed to verify gas
tight integrity of gas piping following its installation or

• PURGE - To free gas conduit of air or gas, or mixture of gas
and air.
• PURGE TIME - Period of time intended to allow for
dissipation of any unburned gas or residual products of
combustion.
• QUALIFIED AGENCY 
company engaged in and responsible for:
• Installation, testing, or replacement of gas piping, or
connection, installation, testing, repair or servicing

• Experienced in such work.
• 
• 
jurisdiction.
• SAFETY RELIEF VALVE - Valve designed to relieve
pressure in hot water supply system when pressure exceeds

• SAFETY SHUTOFF DEVICE
supply to controlled burner in event source of ignition fails.
• SEDIMENT TRAP - Gas piping arrangement designed to

valve.
• SERVICE -Supply, installation, or maintenance of goods

• TWO PIPE SYSTEM - Type of venting that allows for



• VENT
appliance vent connector to outdoors.
• VENTING SYSTEM - Continuous open passageway from
of appliance vent connector to outdoors for purpose of

14 - GLOSSARY
240012564 REV A, [05/15/2019]