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ASME I Part PTFH need PSV

thread391-503058

ASME I Part PTFH need PSV

ASME I Part PTFH need PSV

(OP)
I'm involved in the construction of a Liquid Phase Thermal Fluid Heater in accordance to ASME I Part PTFH.
Considering that the heater and system are open to atmosphere, it's required to install a pressure relief valve?
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RE: ASME I Part PTFH need PSV

Why open to the atmosphere? I dont know of any thermal heat transfer fluid that doesnt oxidise / degrade at high temp when in contact with air. Heat transfer fluids are all operated in closed recirculation loop.

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