effect of longer holding time during hydrotest

[asad azmi]

Dear All

 

Goodday.

 

 

On what basis holding duration (eg.1 hour, 2hour etc) 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

[Kristian Lund Jepsen (KUJ)]

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: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of asad azmi
Sent: 26. september 2010 07:06
To: material...@googlegroups.com
Subject: [MW:7198] effect of longer holding time during hydrotest

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[sudharsan s]

It depends up on the code which you follow. As per ASME B31.3 (Process piping) it is minimum 10 minutes. But you take API 560 (for fired heaters) it  is minimum 1 hour.

 

If it is as per ASME B31.4 (Pipeline transport system for Liquid Hydrocarbon) then it is minimum 4hours. For pipelines the BS8010 calls for 24 hour test.

In almost all the cases it will be less than 90%  of yeild strength.

--

[Shashank Vagal]

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) <K...@ramboll.com> wrote:

[M. Ali]

Dear Asad,

The time required for hydrotesting of any equipment is mostly based on
the complexity of its construction. You can say that its the time
required for a sign of leakage or seepage to take visual effect. So
the more complex the equipment is, the longer should the time be
extended.
Furthermore, if you are having a sufficiently weak member in the
system, the exposure time should be enough to allow that member to
leak or crack etc.
For equipment sound enough, no impact on the physical properties & in
a nutshell, the time should be up to the satisfaction of the
inspector.

Regards,

Muhammad Ali

[Kristian Lund Jepsen (KUJ)]

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

[muthu barathi]

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:
material...@googlegroups.com [mailto:materials-
wel...@googlegroups.com] On
Behalf Of Shashank Vagal

Sent: 26. september 2010 13:09

To: material...@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: material...@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:
material...@googlegroups.com
[mailto:material...@googlegroups.com] On Behalf Of asad azmi

Sent: 26. september 2010 07:06

To: material...@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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The views expressed/exchnaged in this group are members personel
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meant for educational purposes only, Users must take their own
decisions
w.r.t. applicable code/standard/contract documents.
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welding.blogspot.com/

The views expressed/exchnaged in this group are members personel
views and
meant for educational purposes only, Users must take their own
decisions
w.r.t. applicable code/standard/contract documents.







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welding.blogspot.com/

The views expressed/exchnaged in this group are members personel views
and
meant for educational purposes only, Users must take their own
decisions w.r.t.
applicable code/standard/contract documents.









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>
The views expressed/exchnaged in this group are members personel views
and meant for educational purposes only, Users must take their own
decisions w.r.t. applicable code/standard/contract documents.
>

Dear Sir,





Thanking You,

Honesty is the best Policy

With Warm Regards,

P Muthu Barathi
Mobile No:09967300544

[Karthik]

Hi, Code B31.3 says 10 Minutes is a HOLDING TIME for Test Pressure.During this No body should enter in to the testing area for safety purpose.After holding time pressure gauge reading shall be checked for any pressure drop.Then the Pressure shall reduce to MAWP and during this time only Inspection can done.Inspection time may extend to less or more than 30 minutes according to the inspection duration. The water filling,settlement of water and all that fall in test preparation and it will not include or consider as a holding time.   Thanks & Regards,   (Karthik) Karthikeyan.S QA/QC Manager Getabec Energy Co.,Ltd. 379,Moo6,Soi8,Nikhomphatana, Rayong-21180, Thailand. Phone: 0066 38 897035-8 (Off) Fax: 0066 38 897034 Hand Phone: 0066 892512282 --- On Mon, 9/27/10, muthu barathi <muthu_...@rediffmail.com> wrote:

[Suresh]

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

Thanks  & Best Regards,

Suresh

Mobile No: 91-92 92 905 905

[giris...@indiatimes.com]

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)

[César Alexis Viteri Pérez]

Dear Suresh,
 
Agreing with Girishkul, the only restriction is don't pass the 0.9 yield limit, B31.4 / B31.3 and others establish the requirements of pressure testing in order to not pass 0.9 Sy (if u has to pass that limit an engineering study is required)
 
Another common practice is make an leak test at max operation pressure after pressure testing.
 
Regards
 

---

Date: Tue, 28 Sep 2010 10:17:49 +0530
From: giris...@indiatimes.com
To: material...@googlegroups.com
Subject: Re: RE: [MW:7238] RE: 7198] effect of longer holding time during hydrotest