What are the differences between working pressure, test pressure and burst pressure?

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NAHAD (National Association of Hose and Accessories Distributors) and EJMA (Expansion Joint Manufacturers Association) calculations are used to derive theoretical burst pressure. Industry standard, ASME Boiler and Pressure Vessel Code, Standard Code for Pressure Piping, etc., recommend a 4:1 safety factor for maximum working pressure. Thusly, maximum working pressure is 1/4 the theoretical burst pressure. The maximum test pressure is 1.5 times the maximum working pressure.
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