Re: [MW:17524] Name Plate Hydro Test pressure

Hello Mr Ghosh

I am very much aware that a vertical vessel can be hydrotested in horizontal position , but my question is what pressure should be mentioned on name plate : the corrected i.e tested pressure or the one mentioned in drawing for vertical position ??

Regards 

Prem Nautiyal

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Tarantula Ghosh <ghosh.tarantula@gmail.com> wrote:
Mr Prem,

Hope this helps:
Interpretation:        VIII-1-95-27
Subject:        Section VIII, Division 1 (1992 Edition, 1993 Addenda); UG-99(b)
Date Issued:    January 12, 1995
File:        BC94-414

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.

T Ghosh

On Mon, Apr 22, 2013 at 9:41 PM, prem nautiyal <prem_nautiyal26@yahoo.com> wrote:

Hi friends

 

Vendor has fabricated a process equipment with skirt support as per ASME Sec VIII Div.1

 

The height is 11 metres and ID is 4.5 metres.

 

The vessel is going to be erected at site in vertical position with skirt supports.

The HydoTest Pressure specified on drawing for Vertical position is 14.5 Kg/cm2g.

 

However Due to shop height restriction vendor is not able to conduct Hydro Test in Vertical position and  has done hydro test in horizontal position  adding the head difference ( for every 10 m height - 1 Kg/cm2g head to be added).

So the actual Hydro Test Pressure conducted in shop is at 15.5 Kg/cm2g.

Also he has mentioned the corrected hydro test pressure i.e. 15.5 Kg/cm2g on Name Plate.

Nothing is mentioned about this corrected pressure in drawing or QAP.

 

Is it correct ?

 

Does the fabricator have to mention the actual tested corrected  hydrotest pressure on Name Plate or the Pressure mentioned on drawing.

Please give code reference.

 

Regards

 

Prem Nautiyal

 

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