Safety accessories intended for pressure equipments covered for vessels, piping and fired or otherwise heated pressure equipment, including where such equipment is incorporated into an assembly.
Definitions “Safety accessories”
Safety accessories are devices designed to protect pressure equipment against the allowable limits being exceeded, including devices for direct pressure limitation, such as safety valves, bursting disc safety devices, buckling rods, controlled safety pressure relief systems (CSPRS), and limiting devices, which either activate the means for correction or provide for shutdown or shutdown and lockout, such as pressure switches or temperature switches or fluid level switches and safety related measurement control and regulation (SRMCR).
Classification
The safety accessories are basically classified in category IV.
Exception: Safety accessories manufactured for specific equipment may be classified in the same category as the equipment they protect.
Note 1: Pressure regulators are in general pressure accessories. Only in the case where they fulfil the definition of safety accessory and consequently have a specified safety function, they are to be considered safety accessories.
Note 2: If a vacuum relief valve is designed to be fitted to pressure equipment
(PS > 0,5 bar) where collapse due to vacuum is possible under reasonably foreseeable conditions, than the vacuum valve is a safety accessory and must be assessed as such.
Note 3: Quick-opening closure on pressure equipment can be safely opened by pressure control equipment, but this control equipment is not a safety accessory.
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Difference “Pressure Safety Valve” and “Pressure Relief Valve”
