Section PSC 135.355 - Customer meters and regulators: protection from damage additions [49 CFR 192.355](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) 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.Wis. Admin. Code Public Service Commission PSC 135.355
CR Register, October, 1999, No. 526, eff. 11-1-99.