WNRF Flange Design for 1660 mm ID with Design Pressure 130 bar

[brkmech1234]

I am struggling to design the flange with 130 barg pressure. MOC is SA 182 F51. Bolt material is SA 320 L7M. Gasket material SDS SPW. Design code is ASME VIII div 2

If I provide sufficient number bolts, bolt spacing is less than recommended. I tried with various bolt sizes ranging from 1 " to 4" and I could not accommodate the same. I attach the Pv elite files of the same.
Can any suggest a way out of this.

 

[brkmech1234]

Missed attach the file

 

[SnTMan]

Can't open the file. How about a PDF?

Regards,

Mike

 

[gr2vessels]

The attachment is a PV Elite file. Can you post a Word conversion of the analysis? Are trying to re-design an ASME B16.5 flange?

 

[racookpe1978]

What temperature?
What service? (What fluid?)

 

[brkmech1234]

Dear All,

Thank you for comments. I attach the files in pdf and word. I have chosen 88.9 mm bolt diameter and circumferential spacing is 146.25 where as minimum is 180.97 mm.

 

[SnTMan]

L7M? L43? You might start by carefully checking your inputs.

 

[racookpe1978]

I have chosen 88.9 mm bolt diameter and circumferential spacing is 146.25 where as minimum is 180.97 mm.

Why a 88.9 (rather than a 90 mm ??) bolt? That over 3-1/2 inch diameter.

 

[MJCronin]

Can you tell us what this "Big Jumbo" flange is part of ?

What kind of process requires this kind of large components at such a high pressure ?

 

[racookpe1978]

Are you trying to 'design" flange that large, or are you trying to re-design one from a standard design for that pressure?

i don't see any standard flanges that large using bolts larger than 50 mm.

 

[brkmech1234]

Unfortunately not a single sensible comments received.

 

[LittleInch]

That's because you're drip feeding information. Give people the full story and you might get some responses. A flange this big at that pressure with those size bolts looks on the face of it unfeasible and certainly far far outside what I would imagine anyone has seen before.

You will get help, but lay out what it is your head clearly, with some diagrams and notes and what your key issues / problems are, with refeerences to codes or design issues.

My motto: Learn something new every day

Also: There's usually a good reason why everyone does it that way

 

[SnTMan]

brkmech1234, I got your file to open. it is a PVE 2013, BTW.

No gaurantee this can be made to work but: When your bolts are spaced too closley together, and assuming you can't raise the allowables, that means you need to use larger bolts. This in turn drives up the bolt circle, and maybe the mean gasket diameter, which can drive up the required bolt area even further, requiring still larger bolts, etc, so that it just feeds on itself.

You need to (some or all): use higher allowable bolts, use a smaller gasket diameter and width, use a gasket with lower factors.

As others have noted, this is an extremely large, extremely high pressure design. A bolted joint may not be suitable.

Regards,

Mike

 

[gr2vessels]

Typically the Kammprofile and Edge gaskets are accepted for high pressure & temperature (Edge m=2, y=5000 psi);- (Kammprofile m=4, y=4000 psi). These figures are guaranteed by the manufacturer. Try them.

 

[brkmech1234]

Thanks SnTMan & gr2vessels