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A line pressure regulator shall be installed where the gas supply pressure exceeds the maximum allowable inlet pressure of the appliance served. [NFPA 54:5.8.1]
1208.8.1 Listing
Line pressure regulators shall be listed in accordance with CSA Z21.80 where the outlet pressure is set to 2 psi (14 kPa) or less. [NFPA 54:5.8.2]
1208.8.2 Location
The gas pressure regulator shall be accessible for servicing. [NFPA 54:5.8.3]
1208.8.3 Regulator Protection
Pressure regulators shall be protected against physical damage. [NFPA 54:5.8.4]
1208.8.4 Venting of Line Pressure Regulators
Line pressure regulators shall comply with all of the following:
  1. An independent vent to the exterior of the building, sized in accordance with the regulator manufacturer's instructions, shall be provided where the location of a regulator is such that a ruptured diaphragm will cause a hazard.
    1. Where more than one regulator is at a location, each regulator shall have a separate vent to the outdoors or, if approved by the Authority Having Jurisdiction, the vent lines shall be permitted to be manifolded in accordance with accepted engineering practices to minimize back pressure in the event of diaphragm failure.
    2. Materials for vent piping shall be in accordance with Section 1208.6 through Section 1208.6.13.5.
      Exception: A regulator and vent limiting means combination listed as complying with CSA Z21.80 shall be permitted to be used without a vent to the outdoors.
  2. The vent shall be designed to prevent the entry of water, insects, or other foreign materials that could cause blockage.
  3. The regulator vent shall terminate at least 3 feet (914 mm) from a source of ignition.
  4. At locations where regulators might be submerged during floods, a special antiflood-type breather vent fitting shall be installed, or the vent line shall be extended above the height of the expected flood waters.
  5. A regulator shall not be vented to the appliance flue or exhaust system. [NFPA 54:5.8.5.1]
1208.8.5 Venting of Gas Appliance Pressure Regulators
For venting of gas appliance pressure regulators see Section 507.21. [NFPA 54:5.8.5.2]
1208.8.6 Bypass Piping
Valved and regulated bypasses shall be permitted to be placed around gas line pressure regulators where continuity of service is imperative. [NFPA 54:5.8.6]
1208.8.7 Identification
Line pressure regulators at multiple regulator installations shall be marked by a metal tag or other permanent means designating the building or the part of the building being supplied. [NFPA 54:5.8.7]

Related Code Sections

1208.8 Fuel Gas Piping, Gas Pressure Regulators
A line pressure regulator shall be installed where the gas supply pressure exceeds the maximum allowable inlet pressure of the appliance served ...
1208.8.7 Fuel Gas Piping, Identification
Line pressure regulators at multiple regulator installations shall be marked by a metal tag or other permanent means designating the building ...
1208.8.1 Fuel Gas Piping, Listing
Line pressure regulators shall be listed in accordance with CSA Z21.80 where the outlet pressure is set to 2 psi (14 kPa) or less. [NFPA 54:5.8.2] ...