Patent ID: 7987867

Claim:
A burst disc arrangement for a cryostat comprising a replaceable burst disc ( 52 ) held in compression between a high-pressure flange ( 60 ) formed at an end of a high-pressure conduit ( 12 ), and a low-pressure flange ( 60 ) formed at an end of a low-pressure conduit ( 14 ), characterised in that: the burst disc arrangement further comprises: a housing ( 50 ) enclosing the high- and low-pressure flanges ( 60 ), said housing ( 50 ) including a first opening ( 20 ) large enough to allow the replaceable burst disc ( 52 ) to pass therethrough; and compression means ( 56 ), distributed around the housing ( 50 ) and being arranged to bear upon at least one of the flanges ( 60 ), so as to urge it towards the other of the flanges, thereby retaining the burst disc ( 52 ) in compression between the low- and high-pressure flanges ( 60 ).