Newly designed or remodeled/re-designed fuel systems shall be designed in conformance with all applicable state and local plumbing and mechanical code.
Instructions to Design Professionals
Design shall show all existing and/or new fuel systems. New designs shall overlay all other mechanical systems to avoid the potential for design conflicts.
Refer to Division 22 05 00, Common Work Results for Plumbing, for additional guidance.
Coordinate the location of the gas meter with Owner’s Authorized Representative and Northwest Natural Gas Company (NWNG). Coordinate meter placement with all exterior existing/new Work. Verify size and capacity of NWNG’s distribution system at point of connection.
Pipe above grade shall be:
Threaded or welded Schedule 40 standard weight seamless black steel where located inside a building
The pipe above grade, when exposed, shall be painted with paint suitable for corrosion protection. Refer to Section 09 90 00 Painting & Coating.
Pipe below grade shall be:
Shall be the same as above ground pipe fittings except the fittings shall be mill wrapped and pipe shall be vinyl coated type.
Above Grade Steel Pipe Fittings: Standard weight, screwed, malleable iron fittings complying with ANSI B2.l.
Below Grade Steel Pipe Fittings: Shall be the same as above ground pipe fittings except the fittings shall be mill wrapped and/or vinyl coated type.
Pipe Joints: TFE pipe thread sealant or Teflon tape. Apply to male threads only.
Provide valves at each capped stub out for future extension, and at each piece of equipment. Valve shall be plugged with brass plug until it is ready for use.
Request the local utility company to provide a valve upstream of the gas meter.
Provide a gas pressure regulator with a built-in internal relief and low- pressure cut-off, or for large demands, a gas pressure regulator with an internal relief and separate low-pressure cut-off.
Vents shall be provided from each pressure regulator. Vents shall run independent and terminate outside the building at a location in compliance with code.
Provide pressure gauges with gauge cocks on the upstream and downstream side of each regulator and a separate low pressure cut-off to aid in checking the gas pressure.