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#58569 - 04/11/14 12:15 PM API 650 App P shell thickness w/repad
daryljose Offline
Member

Registered: 06/01/10
Posts: 6
Loc: alberta
I am working through the nozzle calculations per App P.2. The tank includes a repad (1/4", same as shell).

My question is does 't' (shell thickness) include this repad ie. 1/2"?

I can see it not being included for somthing like radial deflection or shell rotation, since the repad is only a small part of the tank shell. But if it isn't included at all, I dont see where having a repad or not benefits the calculation, ie. shouldn't the calculation with a repad produce higher allowable loads?

Thanks.
Daryl

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#58574 - 04/11/14 07:03 PM Re: API 650 App P shell thickness w/repad [Re: daryljose]
Richard Ay Offline
Member

Registered: 12/13/99
Posts: 6205
Loc: Houston, Texas, USA
The stiffness curves for "reinforcing on the shell" assume a pad with thickness equal to the shell thickness.
_________________________
Regards,
Richard Ay - Consultant

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#58711 - 04/22/14 08:29 AM Re: API 650 App P shell thickness w/repad [Re: daryljose]
Jamil Offline
Member

Registered: 07/18/12
Posts: 21
Loc: Saudi Arabia
Dear Mr. Richard,

You are saying that appendix P curves are based on thickness of shell plus pad of same thickness as shell,and There is no need of giving pad thickness??

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#58739 - 04/23/14 04:01 PM Re: API 650 App P shell thickness w/repad [Re: daryljose]
Richard Ay Offline
Member

Registered: 12/13/99
Posts: 6205
Loc: Houston, Texas, USA
Yes, that is the assumption if you select the curves for "reinforcing on the shell". The other set of curves, "reinforcing on the nozzle" assumes no pad is necessary.
_________________________
Regards,
Richard Ay - Consultant

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