under ground pipeline leak testing method during hydro test

[mohd.qce]

Dear experts,

Can any one give good and efficient method of underground(buried) pipe
line leak testing method during hydrotest?

Pipe: API 5L Gr 52 MS PSL-2.
Length : Two section 50km+50km (2500 joints approx each section).
Test pressure : 73.25 bar.

[Srinivasulu Kalasapati]

I remember hydrotest for 42" condensate line going to offshore, the
complete line was pressurized for 24 hrs to see any leakage coming out
to soil top, but the line was also hydrotested spool basis before
backfill

Regards,
Srinivas

> --
> 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/
> 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.
>

--
Ohm Guru Namasivaya

[rajesh ac]

Dear   Using  dead weight tester    First theoritical volume of water to be calculated   Filling and stabilization at  half  of  volume   air content calculation etc to be calculated   After  gradual increase of pressure and 24 Hours holding required   Regards Rajesh                 --- On Thu, 1/5/12, mohd.qce <mohd...@gmail.com> wrote:

-- To post to this group, send email to material...@googlegroups.com

To unsubscribe from this group, send email to materials-welding+unsub...@googlegroups.com

[narasimha murthy]

Underground lines shall be hydro tested for a time duration of min 24 hrs by using pressure and temperature recorders so that any drop in pressure if noted can be evaluated if its due to temperature variation or due to leakage, this should be a procedure accepted with agreement of the client.

Regards

--
To post to this group, send email to material...@googlegroups.com

To unsubscribe from this group, send email to materials-weld...@googlegroups.com

[Hafiz Khan]

underground pipelines have been hydro tested for a time of duration 1 hrs but line is 1.5 km.this pipeline are tested by without using the pressure and temperature recorder and my question 

why do we want to use this pressure and temperature recorder?

can you give me any detail for this one and send some sample copy format & procedure

  

Regards

HAFEEZ KHAN.G 

 

[mohd]

dear hafiz,

As per B31.4 hydrotest duration is 4 hr for piping system operated more than hoops stress of 20% or more of  yield strength  and LEAK TEST is carried out for 1Hr piping  operated at hoops stress of 20% or less of  yield strength.

Pressure and temparature recorder can be use as specified by client spec or have hard evidence of hydro test pressure and temperature variation.

moreover performing hydrotesting for long hr 4hr to 24hr need recorder to prove that pressure drops or increase is function of temperature at last to get client approval.

hope this clear!! 

as per which code you have done hydro test for 1Hr.

[Hafiz Khan]

Dear Sir

      I hope your answer for using the integrated codes and standards but my concerned what are the procedure and method should be carrying out for inspection time.

      I need information about this underground pipeline material such as carbon steel, RTR material.what is the code and standard applying for during hydro test time and erection of new underground pipeline should be  open or closed atmosphere during inspection time

--

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=&gid=122787&trk=anet_ug_hm

 
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.

---
You received this message because you are subscribed to the Google Groups "Materials & Welding" group.
To unsubscribe from this group and stop receiving emails from it, send an email to materials-weld...@googlegroups.com.
For more options, visit https://groups.google.com/groups/opt_out.

[Richard robes]

Can you make more clear, whether pipeline is coming under 31.4 or 31.8?

[Hafiz Khan]

ASME 31.3