The Simple Pressure Vessels (Safety) Regulations 1991

[fred2002]

Are these regulations applicable to a pressure vessel which will see an internal vacuum of 500 mbar?

If not, what legislation is?

 

[gr2vessels]

fred2002,
The mentioned regulations refer to pressure vessels used for compressed gas storage, in other words capable of storing latent energy.
I believe that your low vacuum operating condition would not qualify the vessel as a pressure vessel, say in accordance with ASME VIII U(1)(h) and is not covered by the 1991 regulations.
Cheers,
gr2vessels