Could one (or more) of you guys please explain the relationship of the various published standards of ASTM; ANSI; and ASME? I can't seem to find anything online that will allow me to view or read the standard I am looking for. My problem is that I have a contract that requires certain materials and fittings to meet ASTM B16.39. The suppliers cut sheet says that it complies with ANSI B16.19. I need to know how to determine if the material meets the spec. I did manage to find out that the ASTM standard is somehow connected to ANSI, but I don't know how.
P.S. I do know what all the acronyms mean, I just don't know how the organizations function or interact.