[MW:3180] Re: 3137] hot-oil traced line

Dear Friend,

 
The pneumatic test is more hazardous than hydro because of compressibility. The compressive media has more stored energy. No doubt the test can be conduct with full care.

1) If the air pressure cannot be available at this high pressure. It will be better to use the N2 instead of air which is available in cylinders at 145-150 kg pressure.

2) All the fitting used should be properly checked better to have seal welded to avoid failure.

3) The test using N2 is to be carried out in open because in enclosed area N2 any small leakage can result in suffocation as it will displace O2 required for respiration.

4) The test is to be raised in steps & stablisation od pressure & inspection is very important at every step.

 

amarjit singh

On Tue, Sep 8, 2009 at 1:02 PM, Bathula Raghuram (Mumbai - PIPING) <R.Bathula@ticb.com> wrote:

Avoid due to safety reasons, please see the attachment. Or convince your client with additional NDT along with very low pressure pneumatic test followed by service test.

 

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From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of daniel iordache
Sent: Tuesday, September 08, 2009 12:27 PM
To: materials-welding@googlegroups.com
Subject: [MW:3137] hot-oil traced line

 

hello Friends

 

we have in project 10-12" bitumen line .......these lines are accompanied by hot-oil traced line 1" sch 40....maximum pressure for those line are 30 psi.....due the complexity of network ....i want to test line instead of hydrostatic ...pneumatic at 90 psi ... ....there is any restriction..? Most of people said is avoid to do pneumatic test ...by code ....i did not find any ....

 

please advice

--
Daniel Iordache
Bureau Veritas - Angola
Mechanical& Welding Surveyor
Mobile Ao: +244921544583
Mobile Ro:   +40721731728
E-Mail: daniel.iordache@gmail.com
          daniel_iordache@yahoo.com

--
Amarjit Singh

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