Re: [MW:25999] RE: 25974] Re: 12688] Cross country pipeline hydro test

Section length also decide based on confirmation of pig manufacturer and pressure difference at high and low point or maximum and minimum

On 28-Jan-2017 2:06 pm, "Lakshman Kumar B" <lakshmankumar4@gmail.com> wrote:

Hi,

 

Please note a small correction in my earlier mail…

As stated by you there is no restriction of length as per B31.8, - your statement and understanding is correct.

In one of my previous project we had a limitation of 50KM and the same I shared at here.

However in general doing 50KM at a single stretch is a big challenge and other parameters may not support too (particularly in INDIA)

If your project specs are permitting you can do the hydro test more than 50KM also, no code restrict' s you…

 

Thanks & Regards,

Lakshman Kumar B,

+91 9440031459.

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of belendine@gmail.com
Sent: Monday, January 23, 2017 3:38 AM
To: Materials & Welding <materials-welding@googlegroups.com>
Subject: [MW:25974] Re: 12688] Cross country pipeline hydro test

 

Dear Mr Kumar,

 

Would you please elaborate why 50 km is stipulated as the restriction according B31.8? Or did I get it wrong?

Correct me if I'm wrong, ASME B31.8 does not restrict the hydrotest length by number, does it?

 

Regards

On Monday, October 17, 2011 at 5:15:06 AM UTC+1, Lakshman Kumar wrote:

Hi,

Good morning to all,

 

1.      Because of safety parameters HT will be done after back filling – as the pipe passes in public areas also, and keeping the excavated sections to open up to HT is also risk, so there is no other option except to do HT after back filling.

2.      Leakage water will come to ground and we can identify – however in water pipe lines – some extent of leakage is acceptable for small leakages (as per CODE), and heavy leakages will be identified by water on the ground.

For oil& Gas, LPG, other services lines so many other options are their to detect(75% of the cases it will be identified in pigging only)

 

3.      Maximum length depends up on service of the line, geographical conditions, site conditions, elevation differences, water availability and disposal situation however maximum length restriction are their in respect codes ex ASME B 31.8 – for oil & gas 50KM is maximum – and this will be given in client spec also.

 

Thanks and Regards................?

Lakshman Kumar.B|Manager |Lanco Infratech Limited Plot No 1255 | Sanjeevani chowk | Mahanadi vihar | Cuttack 753004 Phone : + 91 671 2445033 | Mobile : +91 9937286851 |www.lancogroup.com Go Green|The future will thank you

 

 

From: material...@googlegroups.com [mailto:material...@googlegroups.com] On Behalf Of prashant pansare
Sent: Sunday, October 16, 2011 7:05 PM
To: mat wel
Cc: prash pan17
Subject: [MW:12688] Cross country pipeline hydro test

 

Dear All,

In Cross country pipeline

1) Why hydro test is carried out after covering / back filling the complete pipeline?

2) In case of seepage, we' ll get pressure drop on gauges,but how to detect the location of leak?

3) What is the maximum length of pipeline that can be hydro tested at a time?

Thanx & Regds,

PSP

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