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TOP BODY FLANGE ABOVE NPS 60" WNRF FLANGE DIMENSION CLARIFICATION

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staticmh

Mechanical
Aug 28, 2019
57
Hi Folks!

Need expert opinion from all the specific static equipment design engineers discipline peoples.

My Question is regarding to obtain the TOP BODY FLANGE dimension of 1800 mm Inisde diameter.

i'm going to design a vertical vessel, which is 1800mm I.D and 16mm thickness of the shell.

I want to design it under the ASME SEC VIII Div-1 Appendix-2 flange, but problem is that i could not figure out that which standard to follow the dimension to get the nearest passing thickness and all suitable dimensions. as far as i have already seen B 16.47 Series A & B which is limiting to NPS-60" flange size.

So please advice if anybody can help me out in this regards that which standard should i follow which allow ASME for above 60" WNRF Flanges.

I'll be thanking in your anticipation.

Regards,
Static7505

 
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static7505, if you can't find a standard that meets your needs, you have to design the flange yourself. You select the gasket and its dimensions, you determine the bolting required, you select the hub dimensions if an integral type, set the bolt circle, select the facings if any, calculate if a chosen thickness is adequate as per Apx 2.

Alternatively you could select the closest B 16.47 flange, adjust dimensions to fit your needs, and run it thru Apx 2.

There have been posts in the past that more fully describe the flange design process, try a site search.

Regards,

Mike


The problem with sloppy work is that the supply FAR EXCEEDS the demand
 
SnTman, Thank you for your valued feed back. Really Appreciated.

I took the reference dimension from PN16 and AWWA. as you can see the below link for PN16.

Link

For flange designed i considered the ASME Appendix-2 procedure of calculation, but its calculating quite more stringent thickness near approx. 132mm which is seem much weird.

I'll give a another run to make it more optimized design from thickness point of view. However, flange design process is not a bottleneck for me but indeed only reference of dimension was an significant issue for me.

Again thanking you on your reply!



 
staticmh, a useful practice to minimize flange thickness is to minimize the applied moments. In practice this means making mean gasket diameter as large as possible and bolt circle as amall as possible.

The problem with sloppy work is that the supply FAR EXCEEDS the demand
 
What if i follow the Taylor Forge book ?
 
Excellent idea, and if you can get Table D-5 from TEMA, or similar, it recommends clearances from hub or fillet weld to bolt circle and minimum spacing bolt-to-bolt. Note that selecting bolt size and quantity is usually an iterative process, and perhaps requires that bolt circle be revised per each iteration.

The problem with sloppy work is that the supply FAR EXCEEDS the demand
 
SntMan, you feedback is commendable but can anybody share any firm information regarding the flange dimension which i can follow straight away without any design of customized flange.

The intent of this flange shall be for vessel and in test condition of MAP*1.3 should be qualified in blind to WNRF flange case. This is my most probably intention now.
 
staticmh, a bit of googling turned up this catalog containing several standards for large diameter flanges.

Regards,

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand
 
It should be noted that the flanges included in that catalogue are not recognized by ASME VIII-1. You would still need to run ASME Appendix 2 calculations to confirm their suitability...

Marty
 
Yes, correct, thanks marty007

The problem with sloppy work is that the supply FAR EXCEEDS the demand
 
SnTman,

Thank you very much for your quick link and support.

What i determine that still we need to verify flange design based on Appendix-2 flange.
 
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