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API

PDF Standards API Spec 5CRA (R2021)

Specification for Corrosion Resistant Alloy Seamless Tubes for Use as Casing, Tubing and Coupling Stock, First Edition, Includes Errata (August, 2011)
standard by American Petroleum Institute, 02/01/2010

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PDF Standards API Std 521

Guide for Pressure-relieving and Depressuring Systems: Petroleum petrochemical and natural gas industries-Pressure relieving and depressuring systems, Fifth Edition (Includes 2008 Addendum)
standard by American Petroleum Institute, 01/01/2007

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API

PDF Standards API Std 620

Design and Construction of Large, Welded, Low-Pressure Storage Tanks, Twelfth Edition, Includes Addendum 1 (2014) Addendum 2 (2018) and Addendum 3 (2021)
standard by American Petroleum Institute, 10/01/2013

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