You can download some API standards here.If you are willing,you can share yours with us.Thanks!
API Spec 5ST:2010 pdf download
API SPEC 5LD:2009 pdf download
API RP 1166:2010 pdf download
API St 677:2010 pdf download
API RP 686:2009 pdf download
API RP 621:2010 pdf download
API RP 576:2009 pdf download
API RP 13K:2022 pdf download
API Publ 2388:2010 pdf download
API MPMS 17:2022 pdf download
API STD 674:2010 pdf download
API RP 14E:2007 pdf download
API St 611:2008(2019) pdf download
API Publ 2510A:2010 pdf download