Fuel Gas Piping and Combustion Appliances
Piping and appliances
The Oregon Fuel Gas Code, based on the IFGC, covers gas piping, appliances, venting, and combustion air. Size pipe using the code tables for the available pressure and total connected load. Install a sediment trap, a shutoff valve, and proper support. CSST must be bonded per manufacturer and code requirements. Protect piping from physical damage and prohibited locations.
Combustion safety
Category I appliances need proper vent slope and draft; Category IV appliances need condensate management and sealed venting. Provide combustion air and check for CO. Test for leaks with approved methods. A permit and inspection are typically required for new gas piping and appliance replacement.
Worked example
A 60,000 Btu/h furnace on a 25 ft CSST run. Use the manufacturer's sizing table, add a sediment trap, bond the CSST, and verify the vent termination and combustion air. Then perform a leak test and combustion analysis.
Traps
Omitting the sediment trap; using a flexible connector through a wall; improper vent slope; and ignoring combustion air.