X-Grade Pipe with A105/A234 B16.9/B16.34 Fittings 3

[KernOily]

Hi guys. I should know the answer to this, but I don't. For API X-grade CS pipe, don't we just use regular A234 WPB BW fittings and A105 flanges? As long as all are ASME P1 materials, and the wall thicknesses and flange ratings are all matched up, there's no issue - right?

I guess I'm asking - is there such a thing as X-grade fittings?

Thanks guys! Pete

 

[LittleInch]

Yes there are - Use MSS-SP-44 and material A694 grade F X, where X is the same as your API 5L X grade. This is for flanges and fittings, MSS-SP 75 is for other fittings such as tees.

note MSS-SP-44 has the same dimensions as B 16.5, but B 16.5 doesn't list A694 as a material and hence you get into all sorts of issues with ratings.

The key here is "As long as all are ASME P1 materials, and the wall thicknesses and flange ratings are all matched up," If you are matching wt then why are you using API 5L X grade pipe?

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[DVWE]

If impact testing is required, then you need to refer to ASME Section IX, QW-422 for P-No. and Group No.

Group Nos. change at X56 and X70. Your welding procedure will have to be properly qualified with impact testing for the different group nos. if required.

 

[BigInch]

Generally A105 and 234 can be welded to X42. Over that you should spec WPH Y Grades matching your pipe. Such as X52 to WPH Y52, X60 to WPH Y60, etc.

 

[KernOily]

Thanks for your great reply LI. Very helpful.

Your question - "The key here is "As long as all are ASME P1 materials, and the wall thicknesses and flange ratings are all matched up," If you are matching wt then why are you using API 5L X grade pipe?"

Ha. Because they have 3000' of surplus X42 they want to use up instead of buying new Fiberspar.

 

[KernOily]

Bigs - Are you sure about that? This link here

http://pnumbers.com/

says that all X grades are P1.

 

[LittleInch]

If you're simply using higher grade pipe but effectively ignoring its higher strength and just using the same thickness as you would for A106 or Grade B, then just use A105 or A234 fittings. Qualify your weld procedures using the same materials and you won't have an issue.

The problem comes when using X65 at its proper thickness and then using A105 flanges....

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[KernOily]

Thanks LI; that's the strategy.