What I will share with you now is BS EN ISO 4126-3:2006, which can be downloaded for free. The PDF file is collected from the network, so the webmaster is not sure whether the standard’s content is complete.
At first ,let me introduce BS EN ISO 4126-3:2006,its title is Safety devices for protection against excessive pressure—Part3：Safety valves and bursting disc safety devices in combination.
Bursting disc safety devices can be used in conjunction with safety valves in following cases:
a) to protect the safety valve against corrosion, fouling or operating conditions which could affect the safety valve performance;
b) to prevent leakage;
c)to prevent total loss of contents from the protected equipment following the bursting of the bursting disc.
BS EN ISO 4126-3:2006 specifies the requirements for a product assembled from the in-series combination of safety valves or CSPRS according to ISO 4126-1, ISO 4126-4 and ISO 4126-5, and bursting disc safety devices according to ISO 4126-2 installed within no more than five pipe diameters from the valve inlet.

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