Dear all,
On this matter I would like to add is that along with the code requirements, it to certain extent depends on the interpretation and evaluation of the inspector. If the inspector deems it necessary as per the actual condition/ sensitivity of job ( type and thickness of coating may hamper/effect the detection of minor leaks) that the joints be left without painting, and the client agrees, then it has to be like this.
From the below mails as per my interpretation it is neither mandatory to paint nor not to paint.
Regards
Rajneesh
From: Bathula Raghuram (Mumbai - PIPING) [mailto:R.Bathula@ticb.com]
Sent: Tuesday, December 01, 2009 7:40 AM
To: materials-welding@googlegroups.com
Subject: RE: [MW:3774] painting before hydrotest for B31 piping
do you need it for B31.1 or B31.3? pl. refer above interpretation # 5-23, may also find similar interpretations in #2-6, and 3-10
Interpretation: 5-23
Subject: ANSI/ASME 831, Hydrotest Preparation
Date issued: June 11, 1987
File: B3 1-86-033
Question: May all joints, including welds, used in piping systems covered by ANSI/ASME B31.1,
ANSI/ASME 831.3, ASME/ANSI 831.4, ANSI/ASME 831.8, ANSi/ASME B31.9, and ANSI/ASME
831.1 1 be primed and painted prior to hydrotest?
Reply: Yes.
From: pgoswami@sympatico.ca [mailto:pgoswami@sympatico.ca]
Sent: Tuesday, December 01, 2009 12:53 AM
To: materials-welding@googlegroups.com; daniel.iordache@gmail.com
Subject: FW: [MW:3773] hydrotest b31.1
Daniel,
I attached the interpretation of B-31.3 code on the issue of painting before hydrotest:-
- In ASME, B-31.3-2006 Clause 345.3.1 specifies, All joints, welds (including
structural attachment welds to pressure-containing components),and bonds shall be left uninsulated and exposed for examination during leak testing, except that joints previously tested in accordance with this Code may be insulated or covered.
- All joints may be primed and painted prior to leak testing unless a sensitive leak
test is required. The word may is suggestive not mandatory.
- However the best practice for painting ,before or after hydrotest may be mutually resolved with client, depending on the interest of the project.
- Painting before hydro test may involve double and redundtant work.Especially if the defect is detected on a painted surface during hydro test.area to be repaired would require the paint to be stripped and repainted after successful repair.
I hope this would clarify the issue. Appreciate inputs from the others.
Thanks.
Pradip Goswami,P.Eng
Senior Engineer/Specialist(Welding-Metallurgy)
Component Integrity Dept.
Engineering & Training Services Division
ONTARIO POWER GENERATION Inc.
PO Box-2000, RR-55(South)
Nanticoke, Ontario,N0A1L0
Tel:-(519) 587-2201, Ext 3107--in Nanticoke
(416) 231-4111, Ext 5925--in Kipling,Toronto
Fax: (519) 587-6814
Date: Mon, 30 Nov 2009 15:39:12 +0100
Subject: [MW:3771] hydrotest b31.1
From: daniel.iordache@gmail.com
To: materials-welding@googlegroups.com
Hi,
I have a strange situation about Hydrostatic Test ......
Until now we used to let all welds of piping system no painted........
now our client read in B31.3 and open the discussion that in code is wrote that is allowed to paint the welds before hydrostatic test......
What do you think about that?????
regards
--
Daniel Iordache
Bureau Veritas - Angola
Mechanical& Welding Surveyor
Mobile Ao: +244921544583
Mobile Ro: +40721731728
E-Mail: daniel.iordache@gmail.com
daniel_iordache@yahoo.com
--
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