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