OAR 860-023-0025: Purity of Gas

(1) All gas supplied to customers shall contain no more than .25 of one grain of hydrogen sulfide in each 100 cubic feet; 20 grains of sulphur in each 100 cubic feet (30 grains of sulphur in 100 cubic feet may be permitted if the gas utility shall show cause for such an exception in advance or immediately upon the discovery of exceptional conditions that warrant it); five grains of ammonia in each 100 cubic feet. No gas shall contain impurities which may cause excessive corrosion of mains or piping or form corrosive or harmful fumes when burned in a properly designed and adjusted burner. (2) Tests: (a) Each utility distributing manufactured gas, or a mixture of manufactured and other gas, shall test the gas for the presence of hydrogen sulfide at least once each day. Each utility distributing natural gas shall make hydrogen sulfide tests at such intervals as needed. (b) Records of all tests shall be properly filed and shall be reported to the Commission for such periods and at such times as the Commission shall request. (3) Manufactured and mixed gas shall be tested at least once each month for the presence of total sulphur and ammonia. Approved methods of testing shall be used. Record of all tests shall be preserved as specified by the Commission.