Notwithstanding anything to the contrary in ASME B31.1, the following portions of chapter II of ASME B31.1 are recommended rather than mandatory: Part 1, Conditions and Criteria; and Part 2, Pressure Design of Piping Components. The department shall not enforce compliance with Part 1 or Part 2 of chapter II of ASME B31.1
ASME B31.1, section 122.5.1 is amended by adding the following language at the end:
It is mandatory that a pressure gauge be installed on the low-pressure side of a reducing valve. Where two or more reducing valves are installed in series, a pressure gauge shall be installed on the low-pressure side of each pressure-reducing valve.
ASME B31.1, section 122.7 and all subsections are deleted.
ASME B31.1, section 122.8 and all subsections are deleted.
ASME B31.1, section 122.9 is deleted.
ASME B31.1, section 122.11.2 is amended by adding the following language at the end:
The discharge of a high pressure trap shall not empty into a low-pressure receiver unless first run through a flash tank or there is an ample sized vent so a trap failure could not increase the pressure in low-pressure receiver tank.
MS s 326B.925
34 SR 145
September 16, 2009