How to install a natural gas pressure regulator?
As a distributor for Itron, occasionally, we’re asked, “How do you install a natural gas pressure regulator?” The following provides installation and start-up instructions for Itron’s B-series regulators (Models B42, B57, B58, B31, B34S, B34, B38, B35, B36, and B56).
Before beginning, the installer must follow all of their company’s safety and personal protection equipment (PPE) policies, corporate guidelines, and these instructions when installing and repairing natural gas regulators.
- The B-series regulator’s maximum inlet pressure is dependent upon the orifice size and model designation. Non-relief models are limited to 60 psig maximum inlet pressure unless additional safety devices are used (as outlined in the DOT code: OPS, Part 192, Section 192.197).
- B-series regulators for liquid petroleum gases should be restricted to second-stage pressure reduction in the gaseous phase.
- If the B57 regulator’s diaphragm case is loosened from the valve body using the union nut, the torque specification for tightening the union nut is 35-50 ft·lb. Tighten the union nut to the correct torque specification anytime the nut is loosened.
Install Natural Gas Regulator
|Itron B-42 Regulator|
- Always position the regulator vent so moisture (rain, snow) or foreign particles cannot enter the vent opening. Itron recommends placing the vent downward.
- Locate the vent away from building eaves, window openings, or building air intakes.
- When appropriate, mount the regulator vent above the site’s expected snow level.
- The shortest pipe length
- The fewest possible pipe elbows
- A pipe diameter as equal to the vent size (or larger)
Start-up Procedure (all models)
To start up the B-series regulator
- Mount a pressure gauge downstream of the regulator to monitor the downstream pressure.
- With the downstream pressure valve closed, slowly open the inlet valve. The outlet pressure should rise to slightly more than the set-point. Note: For B31 RAS models, remove the seal cap and pull up on the spring housing stem to reset the shut-off valve. Release the stem. This procedure allows gas to flow through the regulator. Downstream pressure should rise to the regulator’s set-point.
- Verify there are no leaks and all connections are tight.
- The regulator was pre-set at the factory to match order specifications. If necessary, adjust the outlet pressure by removing the seal cap on the top of the spring housing and rotating the adjustment screw inside the spring housing.
Models 842, B57, B58, B31, B34S, B35, B56, and B36: large flat-head screwdriver
Models 834 and 838: 9116″ socket and ratchet
Model RB4000: adjustment wrench (ltron part number 799056)
Rotate the adjustment screw clockwise to raise the outlet pressure.
Rotate the adjustment screw counter-clockwise to lower the outlet pressure.
More information is available on Itron’s regulators.