Pressure Systems Regulations (2000) specify exemptions for systems of less that 250 bar-litres (so a 0.1 litre crack bottle at 200 bar is only 20 bar-litres).
Link - not that I can find, although the BS5045 covers "from 0.5 litre".
Exempt - only that I've seen posted on this and previous forums.
Even if they're not exempt, as they never get given to a shop to fill, they never get checked for a test date, so I doubt they ever get tested.
The major difference between a thing that might go wrong and a thing that cannot possibly go wrong is that when a thing that cannot possibly go wrong goes wrong it usually turns out to be impossible to get at or repair.
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Part 1 Pressure systems excepted from all regulations
The most relevant is:
(7) Any plant or equipment required by regulation 6(3)(b) of the Diving at Work Regulations 1997 and used or intended to be used in the course of a diving project to which those Regulations apply.
So PSSR doesn't apply to diving equipment?
The diving contractor must...
b. ensure that suitable and sufficient plant is available whenever needed to carry out safely and without risk to health both the diving project and any action (including the giving of first-aid) which may be necessary in the event of a reasonably forseeable emergency connected with the diving project;
So IF its provided by the Diving Contractor AND used or intended to be used in connection with Diving Operations while "at work" that is covered by the ACOP which gets you the testing regime we know and love; shops should follow this as they are (obviously) at work
Other diving equipment is covered/exempt by PSSR so your personal crack bottle is fine unless you give it to a gas monkey who is "at work" to fill when the ACOP is applied. Same with cylinders - they need to be "inspected" under the PSSR but the testing regime only comes from the ACOP.