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API 520, 7th Ed. = No External Fire Sizing??

API 520, 7th Ed. = No External Fire Sizing??

API 520, 7th Ed. = No External Fire Sizing??

(OP)
I noticed that between the 6th and 7th editions of API 520, part 1, that External Fire sizing on process vessels has been omitted.  Specifically, the 6th edition includes 'Appendix D-Determination of Fire-Relief Requirements' wherein the heat load due to fire on the wetted vessel surfaces can be calculated.  In the 7th edition, this appendix as apparently been omitted. I realize that NFPA/CGA/ANSI can be used for storage vessels, but what source do we use now for heat input to process vessels?

Thanks in advance.

RE: API 520, 7th Ed. = No External Fire Sizing??

API STD 521 contains fire sizing information for pressure vessels.

--Mike--

RE: API 520, 7th Ed. = No External Fire Sizing??

(OP)
Ah ha.  I thought it might.  I wanted to confirm prior to purchasing the latest edition.  Thanks again!

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