P.U.(A)
5/70
FACTORIES
AND MACHINERY (STEAM BOILER AND
UNFIRED PRESSURE VESSEL)
REGULATIONS, 1970
PART III - UNFIRED PRESSURE
VESSELS
Regulation
59. Snifting valves.
Any unfired pressure
vessel wherein may be formed a partial vacuum shall be provided with a
snifting valve or other
vacuum breaking device unless such vessel is constructed to withstand
such vacuum.
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