Do booster hydro-pneumatic tanks require an ASME rating?
Unless local code requires ASME ratings, hydro-pneumatic tanks on boosters are not required to be ASME rated. The scope of the ASME Section VIII Division 1 document clearly states the following: U-1(2) Based on the Committees consideration, the following classes of vessels are not included in the scope of this Division; however, any pressure vessel which meets all the applicable requirements of this Division may be stamped with the Code U Symbol: … f) A vessel for containing water under pressure, including those containing air the compression of which serves only as a cushion when none of the following limitations are exceeded: • A design pressure of 300 psi (2070 kPa); • A design temperature of 210F (99C) A hydro-pneumatic tank can be interpreted to fall under this classification since its application is to maintain pressure in the system by using the air in the tank as a cushion. CSA B51 requires that tanks comply with ASME Section VIII – Division 1. The above section applies for C
