API Std 673 pdf download

API Std 673 pdf download.Centrifugal Fans for Petroleum, Chemical and Gas Industry Services 1 General 1.1 SCOPE This standard covers the minimum requirements for cen- trifugal fans intended for continuous duty in petroleum, chemical, and gas industry services. Fan pressure rise is lim- ited to differential from a single impeller, usually not exceed- ing 100 in. of water Equivalent Air...