#7309 - 07/29/05 02:30 AM
External half pipe jacket
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Member
Registered: 07/16/05
Posts: 9
Loc: Singapore
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Hi all
Could we do hydrotest check on the half pipe jacket in PVElite?
If not, any method to verify the half pipe jacket will not fail under user defined hydrotest pressure?
For nozzle calculation on half pipe jacket (eg. 3"), could we assume the pipe jacket as a vessel with random length with 2 nos. pipe cap and nozzles to be attached?
_________________________
Regards,
CW
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#7310 - 08/01/05 06:48 AM
Re: External half pipe jacket
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Member
Registered: 01/02/03
Posts: 743
Loc: Houston, TX
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Hello CW
If you have performed the calculation in accordance withe ASME VIII, Division 1, the jacket should not fail under the hydrostatic test pressure. Provided you nave used the correct design pressure for the jacket, the hydrotest pressure has already been accounted for.
For nozzles in a half pipe jacket, you can consider the half pipe jacket to be a cylinder with a nozzle installed. The code makes no special case of a half pipe jacket. For the pipe cap, you consider this as an elliptical head with nozzle installed.
_________________________
Sincerely, Ray Delaforce CADWorx & Analysis Solutions Hexagon PPM
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#7311 - 04/09/06 11:39 PM
Re: External half pipe jacket
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Member
Registered: 07/16/05
Posts: 9
Loc: Singapore
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Hi Ray Delaforce
With regards the half-pipe jacket thickness calculation in PVElite, we noticed the joint effiency used is 0.85 which is based on the sample calculation as per ASME code sample calculation. However, we will only go for PT instead of spot radiography. There is no option to fill in user defined joint efficiency for this calculation.
In view of this, we have to verify using manual calculation to show the used pipe schedule is able to withstand the design pressure.
_________________________
Regards,
CW
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#7312 - 04/10/06 08:23 AM
Re: External half pipe jacket
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Member
Registered: 01/02/03
Posts: 743
Loc: Houston, TX
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Hello CW
According to Appendix EE, the 0.85 joint factor is built into formula (2). We just accommodated that in our software. Whether you employ PT or RT is not addressed specifically. There seems to be no discretion it using a joint factor other than 0.85 as far as we can see.
_________________________
Sincerely, Ray Delaforce CADWorx & Analysis Solutions Hexagon PPM
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#55326 - 07/06/13 07:33 AM
Re: External half pipe jacket
[Re: Ray_Delaforce]
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Member
Registered: 02/09/13
Posts: 2
Loc: india
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Hi Ray Delaforce, I have a Vertical skirt mounted PRessure vessel design case as below
Shell:- Shell ID 3400mm X4500mm Tl-TL length ,Int.Design pressure -2bar, Ext Design pressure- 0.1bar
Half pipe limped jacked- Int.Design pressure -4 bar, Ext Design pressure- full vacuum.
I am calculating above case in PV elite-2013 and using appendix EE But where to account and design for Full vacuum in Jacket? I have designed 114mmOD X 3mm thick half pipe . Will it fail under Full vacuum?
Please help. Tushar Deshmukh
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#55359 - 07/09/13 12:10 AM
Re: External half pipe jacket
[Re: CW]
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Member
Registered: 06/08/11
Posts: 113
Loc: India
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Hello tndeshmukh,
Please refer TABLE 9.3 Reaction and deformation formulas for circular arches Case No: 1J in Roarks Stress and strain handbook.
Also lets say if your limpet pipe is welded on a plane instead on a cylinder, you can refer TABLE 15.2 Formulas for elastic stability of plates and shells case no: 21 and TABLE 15.1 Formulas for elastic stability of bars, rings, and beams case no:09 and 10.
Regards ASD23789
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#56310 - 09/25/13 09:08 AM
Re: External half pipe jacket
[Re: CW]
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Member
Registered: 11/12/06
Posts: 125
Loc: Ahmedabad, Gujarat, India
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tndeshmukh,
For FV design consideration of limpet coils, you can refer PD:5500.
Thanks.
Mukesh B. Chopra theculminates@yahoo.com +91-9428500192
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#70271 - 10/29/17 11:17 PM
Re: External half pipe jacket
[Re: Mukesh]
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Member
Registered: 07/03/16
Posts: 1
Loc: India
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USING PV ELITE HOW CAN WE JUSTIFY THICKNESS OF DISHEND HAVING HALF LIMPET PIPE ON IT. ALSO DESIGN PRESSURE OR HYDROTEST PRESSURE FOR LIMPET IS TO BE USED.
_________________________
spyadav
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