Re: RE: [MW:7239] RE: 7198] effect of longer holding time during hydrotest

the essence of the code requirement for hydrotest is to ensure integrity of the system .. the hydrotest time may go well beyond 30 minutes ... there is absolutely no effect on piping as long as you are working well within yield point of the piping material ... it may be 30 minutes or may be 30 hrs (as is common in cross country piping)
----- Original Message -----
From: Suresh
To: materials-welding@googlegroups.com
Sent: Mon, 27 Sep 2010 21:15:11 +0530 (IST)
Subject: Re: RE: [MW:7233] RE: 7198] effect of longer holding time during hydrotest

HI ,

 

In best of my knowledge , we are keeping longer holding time due to check the integrity of the system .generally most of clients specified min 30 Mins holding time in their own specs .

 

Suresh

 

QA/QC

On Mon, Sep 27, 2010 at 6:25 PM, muthu barathi <muthu_barathi@rediffmail.com> wrote:

Hi .

While Hydrostatic testing first you have fill water and water to settle
and air bubbles to be vented out and this leak test is a part of test

if any major leaks will be there it will come out easily depend upon
pressure.

after settlement and attaining pressure requirement, when pressure
shows constant then you can check for leaks on joint. so this process

could not complete with in 10 minute. after settlement of water you
hold it for 10 minutes . minimum it will take 30 minutes because some
Engineers will test with in 10 mins and complete. to avoid this type of

mistakes generally it is followed minimum 30 mins.

Muthu Barathi P
Senior Manager QA / QC

AFCONS

On Mon, 27 Sep 2010 14:13:17 +0530 wrote

>



See ASME B31.3, sec. 345.2.2:



345.2.2 Other Test Requirements

(a) Examination for leak. A leak test shall be maintained

for at least 10 min, and all joints and connections


shall be examined for leaks.



regards

Kristian









From:
materials-welding@googlegroups.com [mailto:materials-

welding@googlegroups.com] On
Behalf Of Shashank Vagal

Sent: 26. september 2010 13:09

To: materials-welding@googlegroups.com


Subject: Re: [MW:7205] RE: 7198] effect of longer holding time during
hydrotest








Kristen:
Please quote the clause from B31.3 about 10 min holding time. For me,
and most of us, too, this issue is unsettled. It will be a good help.


As I see it, hydrotest and strength tests have different
connotations.Please correct me if I am wrong.
Asad:
So long as you are not crossing the 75% (or as specified) SMYS
value for all components in the



loop, the holding time is a non-critical point. But
why would you want to increase it, if all your

leak test checks are completed. It does not make
sense – safety wise and economically at

least.

Shashank Vagal



--- On Sun, 26/9/10, Kristian Lund Jepsen (KUJ)

wrote:


From: Kristian Lund Jepsen (KUJ)

Subject: [MW:7200] RE: 7198] effect of longer holding time during
hydrotest

To: materials-welding@googlegroups.com


Date: Sunday, 26 September, 2010, 2:43 PM

ASME
B31.3 only require 10 minuttes hydrotest.
That
is fully enough for a strength test - and in most cases also for a
hydrostatic leak test.

But
some companies (contractors, costumers)require 30 minuttes test, some

1
hour. It will normally be stated in procedures as part of an ISO 9000
quality
system.

regards
Kristian




From:
materials-welding@googlegroups.com

[mailto:materials-welding@googlegroups.com] On Behalf Of asad azmi

Sent: 26. september 2010 07:06

To: materials-welding@googlegroups.com


Subject: [MW:7198] effect of longer holding time during hydrotest


Dear All





Goodday.








On what basis holding duration (eg.1 hour, 2houretc)
of hydrotest is decided.









What will be the effect on mechanical proerty of material
if the holding period exceeds than as required by design.





eg. suppose for a particular hydrotest holding

period is 2 hours and actual holding period exceeds to 3 hours. what
will be
the effect on mechanical proerty.








Thanks in advance for your valuable suggestions.






Best Regards





Asad Azmi


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Dear Sir,





Thanking You,

Honesty is the best Policy

With Warm Regards,

P Muthu Barathi

Mobile No:09967300544

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Thanks  & Best Regards,

Suresh

Mobile No: 91-92 92 905 905

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