hi. i downloaded this document. it is API PROPOSED STANDARD 661, Air-cooled Heat Exchangers -2015 draft:
This document is identical to API Standard 661, 7th Edition, published July 2013. API is proposing to publish this document unchanged as ANSI/API Standard 661, 8th Edition, after meeting all ANSI procedural requirements for American National tandards (ANSs), including a new Consensus Body ballot, and following ANSI approval as an ANS.
link:
[link Point to another website Only the registered members can access]



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