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Up Topic Welding Industry / ASME Codes / P number
- - By scrappywelds (***) Date 12-10-2009 23:40
Today I had a weld to make on a pop off safety valve. The bonnet material was SA216 WCC CS. My company works with ASME style WPS with P numbers. My problem happened when looking up the material on my little material chart to look up the P number to get the right WPS it was not on there. I called our CWI for the P number he said it was a P1 material, but it was from memory not off of a written chart as he was not in his office. My question was he correct before I add the SA216 WCC CS to my P1 list?
Parent - By Shane Feder (****) Date 12-11-2009 00:37
P1 Group 2
Parent - By ssbn727 (*****) Date 12-11-2009 00:43 Edited 12-11-2009 00:54
Are you talking about one of these?

Look at the materials section on page 7 ofr 29 in the .pdf file and it will show the material as an SA 216 WCC Carbon Steel (Phosphated)... And even though I didn't check any other sources, I believe it is a P-1 number. I remember when I was Boilermaker/Tube welder back in the day and I'm talking in the early 1980's, we used to weld these all the time... I hated that phosphated film crap, but then maybe it's not so bad these days since you didn't comment on it.

I used to wonder why they even welded them on since all you needed to do was to thread it on instead which also made it easier to replace in any event... That's ASME for you!!! :) :) :) I'll check in another list I have at home just to make sure it's a P-1 number grade of CS. ;) Btw, the "WCC" stands for W =  fusion Weldable quality... The first letter C = Cast Steel... the last letter C = respective grades based on composition and properties. Just in case you were interested in what those abbreviations meant and of course the las two letters: CS = Carbon Steel.

Parent - - By MBSims (****) Date 12-11-2009 02:45
Here's the latest list of P-Numbers:

You can also look them up on
Parent - By ssbn727 (*****) Date 12-11-2009 17:32
Thanks! I was looking for that and didn't find it yet, so you saved me any more time trying to find it! ;) Scrappywelds! you can find it on page 7 of 59 in the first .pdf file that MBSims posted.

Parent - - By spots (**) Date 12-11-2009 13:44 Edited 12-11-2009 13:49

SA-216 WCC Is P1 Group 2
Parent - - By scrappywelds (***) Date 12-12-2009 01:08 Edited 12-12-2009 01:10
yes Henry I did wonder what WCC stood for Thank You for the explaination. Thank you everyone who responded to my post so quickly. The old valve was threaded, but it started leaking so weld the new one in. It made for a nice mirror weld. By the way my name is Bryan if you are wondering.
Parent - By welderbrent (*****) Date 12-12-2009 19:13
Nothing to add to the thread, Just wanted to say 'Hi, Bryan'.

If you want us to remember that with ease, you may want to sign out on your posts with your name so we get used to it.  Many others here do that all the time.  I don't care a bit if people know who I am, OH, it's in my username anyway.

Have a Great Day, Merry Christmas,  Brent
Up Topic Welding Industry / ASME Codes / P number

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