You can download some API standards here.If you are willing,you can share yours with us.Thanks!
API IP Spec 1581:2002 pdf download
API IP RP 1597:2006 pdf download
API IP 1585:2007 pdf download
API IP 1585:2001 pdf download
API 526:2002 pdf download
API 510:2006 pdf download
API 594:2004 pdf download
API G00004:2001 pdf download
API Bull E2:2006 pdf download
API IP St 1542:2007 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