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#45437 - 10/23/11 05:57 AM ANSI FLANGE LIMITING MAWP
Yasir Offline
Member

Registered: 10/23/11
Posts: 4
Loc: Nigeria
Hello,
Could anyone advice on how to resolve the warning: An ANSI Flange is limiting the MAWP fand this may affect the pressure used in the Nozzle Reinforcement calculation.
the design pressure of the vessel is 17bar @ 50 degC. The flange material i used is SA-182 F316, GR 2.2, Class 150. I checked ANSI B16.5 and the working pressure for this is 18.4 bar.
How can I resolve the problem?

Regards,

Yasir

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#45448 - 10/24/11 03:23 AM Re: ANSI FLANGE LIMITING MAWP [Re: Yasir]
asd23789 Offline
Member

Registered: 06/08/11
Posts: 113
Loc: India
Dear Yasir,

1. Are you taking the hydrotest of the vessel as per UG-99 (b).

If yes the flange rating pressure (18.4 bar) is limiting the vessel MAWP.
(since the pressure part used for the vessel, or the nozzle reinforcement may allow a greater MAWP than the flange MAWP)

2. If you change the hydrotest option to UG-99 (b) Note 34 you can remove the problem. since design pressure (17 bar) will be considered as the MAWP of the vessel.

Regards

ASD23789

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#45495 - 10/26/11 07:23 AM Re: ANSI FLANGE LIMITING MAWP [Re: Yasir]
Yasir Offline
Member

Registered: 10/23/11
Posts: 4
Loc: Nigeria
ASD23789,

Thanks for your response. i have tried that and still same error message came up.
What else do you think i could try to resolve this. once again thanks for your input.

Regards,

Yasir

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#45496 - 10/26/11 07:33 AM Re: ANSI FLANGE LIMITING MAWP [Re: Yasir]
Yasir Offline
Member

Registered: 10/23/11
Posts: 4
Loc: Nigeria
May be this additional informationg may help; the design pressure is 17barg/Full Vacuum.

Thanks,

Yasir

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#45521 - 10/27/11 07:35 AM Re: ANSI FLANGE LIMITING MAWP [Re: Yasir]
kk Offline
Member

Registered: 06/24/05
Posts: 43
Loc: malaysia
this warning message can be ignore if you treat your design pressure as MAWP. Dont worry
_________________________
kkchong

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#45535 - 10/28/11 01:55 AM Re: ANSI FLANGE LIMITING MAWP [Re: Yasir]
Yasir Offline
Member

Registered: 10/23/11
Posts: 4
Loc: Nigeria
kkchong,

Thank you, it worked.

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