1. (1) After 49 CFR 192.355(a), insert:

   (aw) Install a check valve or equivalent if any of the following apply:

   (1) The utilization equipment might induce a back-pressure.

   (2) The gas utilization equipment is connected to a source of oxygen or compressed air.

   (3) Liquefied petroleum gas or other supplementary gas is used as standby and might flow back into the meter. A three-way valve installed to admit the standby supply and at the same time shut off the regular supply, can be substituted for a check valve if desired.

2. (2) After 49 CFR 192.355(b)(3), insert:

   (4w) At locations where service regulators might be submerged during floods, either a special anti-flood type breather vent fitting shall be installed, or the vent line shall be extended above the height of the expected flood waters.

History

History: Cr. Register, October, 1999, No. 526, eff. 11-1-99.