ASME VIII exchanger on a Section IV hot water heater

[vt2012]

A vendor furnished an ASME VIII heat exchanger on a hot water heating skid. Circulated water is heated by steam in the ASME VIII stamped plate and frame exchanger. Can the exchanger be protected by a Section IV T/P relief valve or does it require a valve stamped to Section VIII?

 

[The Obturator]

The construction code of the vessel should dictate the PRV design. In this case the PRV should be ASME VIII. Why do you want to use a ASME IV design?

Per ISO-4126, only the term Safety Valve is used regardless of application or design.

 

[vt2012]

I recommended an ASME VIII valve, but the vendor furnished the skid with an ASME IV T/P relief valve. Just making sure I'm not off base.

 

[The Obturator]

Think you'll find that the ASME IV PRV was more economical to use. Codes are there for a reason.

Per ISO-4126, only the term Safety Valve is used regardless of application or design.