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sampathkumar
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Ovality Tolerance Level

06/10/2011 11:56 PM

Dear Experts,

Please let me know the tolerance level of [FITTINGS] ELBOWS of 84" ASTM A 403 316/316L.Do tell me the standarad to refer and other relatyed details.
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dj95401
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#1

Re: Ovality Tolerance Level

06/12/2011 12:53 AM

Click Here

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MOBI
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#3
In reply to #1

Re: Ovality Tolerance Level

06/12/2011 10:20 AM

Well said sir...............I like it.

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met_3mr84
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#2

Re: Ovality Tolerance Level

06/12/2011 7:32 AM

dear sampath,

YOU WILL FIND THESE TOLERANCES ON THE FITTING DIMENSION CODE ( i.e : MSS), SEND ME THE DIMENSION CODE NAME AND I WILL HELP YOU SEARCHING.....

SALAM

QA/QC ENG: AMR SOLIMAN
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PWSlack
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#4
In reply to #2

Re: Ovality Tolerance Level

06/15/2011 4:03 AM

Shhhhhhhhhhhhhhhhhhhh!

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Abdel Halim Galala
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#7
In reply to #2

Re: Ovality Tolerance Level

06/18/2011 8:55 AM

From specifications of ASTM A403, the related reference standards of MSS are located at Para. 2.3 MSS Standards:

MSS SP-25 Standard Marking System for Valves, Fittings, Flanges, and Unions

MSS SP-43 Standard Practice for Light Weight Stainless Steel Butt-Welding Fittings

MSS SP-79 Socket-Welding Reducer Inserts

MSS SP-95 Swage(d) Nipples and Bull Plugs

Notes:

1. I have a copy of both MSS SP-25 and MSS SP-95, and I guess that the ovality tolerances of elbows shall be located at MSS SP-43.

2. I got a copy of MSS SP-43, 5 min. ago, and found another type of elbows tolerances not including ovality with max. NPS 24 only.

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Abdel Halim Galala
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#5

Re: Ovality Tolerance Level

06/17/2011 1:29 AM

This large size of elbows NPS 84 may be produced by fabrication at a mill/workshop, therefore -at least- we can apply the tolerances used in design and fabrication of pressure vessels -unless there is a certain code denotes for that tolerances used for elbows- as per ASME BPVC, Section VIII, Div. 1, Para. UG-80 "Permissible Out-of-Roundness for Cylindrical, Conical, and Spherical Shells":

a. At any cross section (including head-to-shell junctions): Dmax. - Dmin. ≤ 1 % D

b. When the cross section passes through an opening: Dmax. - Dmin. ≤ 2 % D

Where Dmax. = Max. inside diameter of shell,

Dmin. = Min. inside diameter of shell, and

D = Shell nominal diameter at the cross section under consideration

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sampathkumar
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#6
In reply to #5

Re: Ovality Tolerance Level

06/18/2011 3:31 AM

Mr.A.H.Galala

Thank You so much.
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Abdel Halim Galala (2); dj95401 (1); met_3mr84 (1); MOBI (1); PWSlack (1); sampathkumar (1)

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