1(1) All gas distributed in this state by any utility shall at all times be free from dangerous or objectionable quantities of impurities such as hydrogen sulphide or other impurities which may cause excessive corrosion of mains or piping or form noxious or harmful fumes when burned in a properly designed and adjusted burner. A gas shall be considered free from undesirable impurities when the quantity of any impurity present is within the limits recognized as allowable in good practice.
81(2) Each utility shall test the gas in such manner and with such frequency as is necessary to insure compliance with this rule.
