Thermal relief valve

[ponnusj]

API 521 recommends to use a 3/4" x 1" relief valve to take care of overpressure due to hydraulic expansion, and recommends to calculate relief load if 3/4" x 1" is not sufficient.

How would one determine if a calculation is necessary ?

The 3/4" x 1" relief valve is not found in API 526 as I think it covers only flanged relief valves. Any idea where we can find info in codes about 3/4" x 1" relief valves ?

[federico.mori]

The 3/4" x 1" relief valve isn't at the API 526 because it´s NPT, not flanged.
ASME B16.34, Valves-Flanged, Threaded and Welding End have information about those valve.
I'm looking for Relief systems handbook Parry. It´s very difficult take this book. this answer a lot of questins of these tips.

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