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Posted by Constant Heat on September 07, 2009 at 17:07:57:
Could someone please clarify the proper method for calculating "Min. Relief Valve Capacity" in MBH for an ASME (Section IV) Hot Water Boiler. As I understand it, using the greater of 8 x Heating Surface or Gross Output in LBS/Hr. Divide that amount by 34.5. Multiply that number by 33,475? Secondly, does the working pressure of the hot water boiler have any relationship to the "Min. Relief Valve Capacity" (MBH) stamped on the ASME plate (i.e. does a hot water boiler designed at 30 psi working pressure have a different Min. Relief Valve Capacity" than a 70 psi? Having established that, How do I determine the proper size for inlet/outlet of the valve. Thank you!