6000 psi Socket Weld Flanges

[PDITestEng]

So I am looking for Socket weld flanges and fitting that can handle 6000psi, are stainless steel and come in a diameter of about 3in for our new hydraulic plumbing setup. Every time I get close to finding what I think I want it end's up being wrong working pressure as most flanges stop at 2500psi. We normally only deal in 37deg flared tubing #20 and smaller so this is a whole new world to me and I cant find anyone who sells what I want in a catalog or on there web site. Would really like to find somewhere that sells these fittings so I can get dimensions, draw up our layout and order said fittings. Please forgive my ignorance as this is 100% new to me. Thanks

 

[1gibson]

A 2500# flange is good to 6000 psi at <100*F.

 

[LittleInch]

Talk to bonney Forge - they seem to make them.

http://www.bonneyforge.com/resources/FSFU.pdf

They do fittings, but if you're going for flanges then you need either autoclave or wellhead type fittings ( API 6A)

something like this

http://autoclave.com/aefc_pdfs/vftcc_english.pdf

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[DGrayPPD]

I assume by 3" diameter, you mean 3" NPS.

As 1gibson stated, 2500# stainless steel flanges between -20^o F to 100^o F are rated for up to 6000 psig according to ASME B16.5.

Do you have a copy on hand?

 

[mk3223]

Per B16.5, the socket flange type isn't listed for Class 2500. A weld neck flange may be considered if the material and design accepted in your application.

 

[DGrayPPD]

Good catch mk3223. I missed that.

 

[PDITestEng]

No I do not have a copy of the ASME B16.5 which it seams like I'm going to need to procure. A few of the places I have found 2500# fittings that are stainless steel are below 6000psi but I could be wrong. This plumbing is going to be in a heavy traffic area for personal so want to error on side of caution when I can. Our hydraulic oil(skydrol) is not personal friendly if sprayed around at high pressure and flow.

 

[KevinNZ]

You can also look at API spec 6A flanges. They have higher pressure ratings for much the same dimensions as ASME flanges. But they are weld neck.

 

[XL83NL]

If you go for B16.5 flanges, you might want to consider
- weld necks, instead of socket welds, as mentioned.
- group 2.8 flanges. These are duplex stainless steels (F44, F51, F53, F55). They go up to 6250 psi at ambient, which is a bit more on the safer side ("so want to error on side of caution when I can") compared to the 6000 psi rating.
- use a kammprofile gasket, graphite filler and 316 ring.
- use PTFE (Xylan) coated A193 B7 bolts or similar

 

[LittleInch]

I would want to avoid flanges and mechanical joints and probably socket weld also at that pressure and proximity to people.

If you can go down to 2" or 2 1/2", many of the normal hydraulic fitting suppliers should be able to cope with this.



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