API Inspector Certifications
A site provided by The American Petroleum Institute for verification of API 510, 570, and 653 inspector certifications.
http://www.api.org/certifications/

API Home Page
http://www.api.org/

ASME
American Society of Mechanical Engineers
http://www.asme.org/

ASNT
American Society of Non-Destructive Testing

http://www.asnt.org/