Why pressure drop occur even there was no leakage in hydrostatic test?

[Mijiz Gruezy]

Dear All,

Why pressure drop occur even there was no leakage in hydrostatic test?

[Sathish Jaganathan]

Due to Temperature Variation.

On Fri, Sep 20, 2013 at 7:22 AM, Mijiz Gruezy <mijiz...@gmail.com> wrote:

Dear All,

Why pressure drop occur even there was no leakage in hydrostatic test?

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Thanks & Regards.....,
J.Sathish
Welding Inspector QA/QC
Gulf Petrochemical Services & Trading LLC, OMAN
Gsm:- 00968 96371006

" Good Way Good Life"

[Nachhattar Singh]

Dear

 

It can be due to ambient temperature drop.

 

Nachhattar Singh

 

PLEASE THINK BEFORE PRINTING

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[Mijiz Gruezy]

what if hydrotest made ​​at 7pm and the given pressure is 5psi, after 11 hours of 6am, still reads the pressure 5psi, but at 9am, ie after 14 hours, Miter reading has dropped to 3.5Psi .. what is happening and its happening causes the condition?

[mohd]

dear friends
thanks for posting intersting question

pl specify whether
it is pipeline.U.G or A.G or vessels vertical horizontal
or skid or piping.
what is hydrotest medium n test pressure
pressure guage range

tempeature variation could.not be the only reason for pressure variation.

lets have more info for duscussion.

regards
mohd.

[Ali Al-Zawamri]

The other point did you purg the vessl fully during filling?

On Sep 20, 2013 9:41 AM, "Ali Al-Zawamri" <alza...@gmail.com> wrote:

Dear.
More clarification required.

What was the temp.. at each step?
How you are sure no leak? What was the test done for leak ditection?
Can you breef the hydrotest arrangments?

Regards,

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[shankar narayan karanth]

May be that air has not been vented out fully ...............Karanth

On 9/20/13, Nachhattar Singh <nachhat...@gmail.com> wrote:
> Dear
>
>
>
> It can be due to ambient temperature drop.
>
>
>
> Nachhattar Singh
>
>
>
> PLEASE THINK BEFORE PRINTING
>
>
>
> From: material...@googlegroups.com
> [mailto:material...@googlegroups.com] On Behalf Of Mijiz Gruezy
> Sent: 20 September, 2013 8:53 AM
> To: material...@googlegroups.com
> Subject: [MW:18700] Why pressure drop occur even there was no leakage in
> hydrostatic test?
>
>
>
> Dear All,
>
>
>
>
> Why pressure drop occur even there was no leakage in hydrostatic test?
>
>
> --
> To post to this group, send email to material...@googlegroups.com
> To unsubscribe from this group, send email to
> materials-weld...@googlegroups.com
> For more options, visit this group's bolg at
> http://materials-welding.blogspot.com/
> http://www.linkedin.com/groups/MaterialsWelding-122787?home=

> <http://www.linkedin.com/groups/MaterialsWelding-122787?home=&gid=122787&trk
> =anet_ug_hm> &gid=122787&trk=anet_ug_hm

[Narasimha Murthy]

Providing more details regarding what is being tested and also the arrangements made would be helpful to give a justifiable reason for the drop in pressure.

In general during hydro testing pressure drop could be basically due to the following 

a) Drop in ambient temperature.

b) Air in the system is not vented out properly during pressurization.

Regards,

[Mohamed Elsahhar]

DEAR FRIENDS
WE KNOW THE RELATION BETWEEN THE TEMPERATURE AND PRESSURE WHEN THE
TEMP. INCREASE THE PRESSURE INCREASE AND OPPOSITE IS TRUE THEN WHEN
THE AMBIENT TEMPERATURE CHANGE THE PRESSURE CHANGE

ENG. MOHAMED ELSAHHAR
QA/QC ENGINEER
CELL PHONE :00201220938021

[Harish Kannepalli]

Please refer P-V-T diagram of water, which shows the relations between pressure, volume and temperature of water; including triple point.

2013/9/20 Mijiz Gruezy <mijiz...@gmail.com>

Dear All,

Why pressure drop occur even there was no leakage in hydrostatic test?

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regards,

Harish.