aaahhh don't be skeeered, it's thinking like that that gets your nerves all twisted up . you gotta bear down & cowboy up , if you can weld ,you can pipeline , the thing is get w/ someone that pipelines , even as a helper 4 a while so you can see what it is then just by watching & listening & asking ??? you 'll get it .798 is good , but you need to know a little , the test is a 24" 500 wall ,one beed cap, (something to think about) THATS A BIG -SS cap