API Specification 6D 23rd Ed. Apr. 2008 (Errata 3, Addendum 1 2009)- Specification for Pipeline Valves - ISO 14313;2007.pdf
[link Point to another website Only the registered members can access]
API Specification 6D:ISO 14313, Errata 4 April 2010 - Specification for Pipeline Valves, 23rd Edition, April 2008.pdf
[link Point to another website Only the registered members can access]



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