You can download some API standards here.If you are willing,you can share yours with us.Thanks!
API RP 70:2010 pdf download
API RP 51R:2009 pdf download
API RP 17Q:2010 pdf download
API Publ 1673:2009 pdf download
API SPEC 7K:2010 pdf download
API STD 676:2009 pdf download
API STD 602:2010 pdf download
API St 598:2009 pdf download
API SPEC 11B:2010 pdf download
API SPEC 10A:2010 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