An important factor in selecting the correct Safety Relief Valve is choosing the correct materials for the application.
It is obviously impossible to cover all possible applications, but we will provide some general guidelines here.
Sour gas applications: Here, NACE recommendations should be followed. Most wrought grades are acceptable to NACE. Therefore, in general, duplex valves with bar stock nozzles and discs will meet NACE requirements.
Some limited cast grades will generally comply also:
For body, bonnet and cap, up to 815 ° C cast materials can still safely be used : ASME SA 351 CF8M with a minimum 0.04% carbon content and maximum 8% ferrite content. In any case, full-rated and integral castings are recommended. Alternatives are:
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