You can download some API standards here.If you are willing,you can share yours with us.Thanks!
API St 672:2010 pdf download
API STD 674:2010 pdf download
API STD 609:2009 pdf download
API St 2560:2010 pdf download
API St 2217A:2009 pdf download
API St 65-2:2010 pdf download
API SPEC 6FC:2009 pdf download
API RP 1162:2010 pdf download
API RP 939-C:2009 pdf download
API RP 574:2009 pdf download
API RP 14E:2007 pdf download
API St 611:2008(2019) pdf download
API Publ 2510A:2010 pdf download