Tuesday, September 8, 2009

[MW:3142] Re: 3137] hot-oil traced line

Dear Danial,
 
I would like to know that you need to test 10/12" line or 1" tracing line?
 
If your line disign code is Asme B31.3,  As per B31.3 you can test this line with pneumatic test if you have problem in testing this line with water due service requirement (required without moisture) or supporting problem or dewaering problem. Also, you have very the stored energy prior to fill the line with air/gas.
 
I hope we no need to refer ASME Sec-VIII for piping pneumatic test? if ia m wrong pl. clarify.
 
Regards
 
Mohan q8.


 
On Tue, Sep 8, 2009 at 10:52 AM, Chaitanya Purohit <chaitanya_purohit@yahoo.co.in> wrote:
Dear Daniel,

If you go through the ASME Sec VIII Div 1, Under UG100 they given the provision to carry out the pneumatic test only if the following is the reason. Also in Footnote 35 they mentioned that "Air or gas is hazardous when used as a testing medium. It is therefore
recommended that special precautions be taken when air or gas is used
for test purposes."

Pneumatic test may be used for vesels
(1) that are so designed and/or supported that they
cannot safely be filled with water; - That is not the case here
(2) not readily dried, that are to be used in services
where traces of the testing liquid cannot be tolerated and
the parts of which have, where possible, been previously
tested by hydrostatic pressure to the pressure required in
UG-99. - You need to check on this point

And again as mentioned by Raghuram and also mentioned in Code footnote (shown above) it is not advisable to go for pneumatic test.
 
C. K. Purohit
Eng-Tech Weld1
Sr Welding Inspector

2009/9/8 Bathula Raghuram (Mumbai - PIPING) <R.Bathula@ticb.com>

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.

 


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











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

No comments:

[MW:34820] RE: 34813] Clarification in Rate of heating and cooling.

Hello,   Please see the response below.   Regards.   P. Goswami, P. Eng, IWE.   From: materials-welding@googlegroups.com <materials-weld...