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FAIZOL82Commentator

Join Date: Oct 2008

Posts: 56

 Vertical and Horizontal Hydrotest Position11/23/2008 11:41 PM

Dear Members,

What is diffrent between Vertical & Horizontal Hydrotest Position. I always used Horizontal hydrotest position for any type of vessel. Could

anyone interpret to me litte bit regarding this matter.

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GaryvanAssociate

Join Date: Jun 2008

Posts: 26

Good Answers: 5

 Re: Vertical and Horizontal Hydrotest Position11/25/2008 1:46 AM

Hi Faizol,

I assume that you are talking about vessels that are fairly tall. If so, then the only difference when hydrotesting the vessel in the vertical

position is that you must take the static head of the water into account. The top of the vessel must obviously experince the full hydrotest

pressure, so the bottom of the vessel will experince this pressure plus the static head. The pressure guage is usually at the bottom of the

vessel, so when testing ensure that the guage reads the total pressure (test pressure plus static head).

HarryBurtPower-User

Join Date: Jul 2007

Location: Cleveland, OH

Posts: 447

Good Answers: 10

 Re: Vertical and Horizontal Hydrotest Position11/25/2008 11:03 AM

I would think that the better position would be the one the vessel will be used in. As stated above, a tall vertical vessel will have a higher

pressure at the bottom that at the top, while a horizontal vessel will have the same pressure throughout.

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FAIZOL82Commentator

Join Date: Oct 2008

Posts: 56

 Re: Vertical and Horizontal Hydrotest Position11/25/2008 7:38 PM

Dear Members,

anybody know how to calculate stress for every parts like bottom head, shell and top head using manual calculation. Could someone guide

me and provide a stress formula.

Thank you.

Anonymous

Poster

 Re: Vertical and Horizontal Hydrotest Position10/27/2009 5:18 PM

For vertical vessels tested horizontally, we have always added the static head to the required hydro pressure. Per interpretation

VIII-1-95-27, this is not required. The test pressure regardless of position is 1.3P times the materials stress ratio. Interpretation:

VIII-1-95-27 Subject: Section VIII, Division 1 (1992 Edition, 1993 Addenda); UG-99(b) Date Issued: January 12, 1995 File Number:

BC94-414 Related Documents: Question (1): Does the last sentence of UG-99(b) of Section VIII, Division 1, "All loadings that may exist

during this test shall be given consideration," require that the static head that exists in a tower in the vertical position must be considered

when determining the test pressure in the horizontal position? Reply (1): No. Question (2): Does UG-99 specify in which position a vertical

tower must be hydrotested? Reply (2): No.

Anonymous

Poster

Re: Vertical and Horizontal Hydrotest Position07/28/2010 4:31 AM

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4 - Thread: Vertical and Horizontal Hydrotest Position http://cr4.globalspec.com/thread/29695/Vertical-and-Horizontal-Hydro...

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8/20/2019 CR4 - Thread_ Vertical and Horizontal Hydrotest Position

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Anonymous Poster (2); FAIZOL82 (1); Garyvan (1); HarryBurt (1)

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4 - Thread: Vertical and Horizontal Hydrotest Position http://cr4.globalspec.com/thread/29695/Vertical-and-Horizontal-Hydro...

2 02/02/2016 5:57 PM