Re: [MW:3781] hydrotest b31.1

Section VIII Div 1
UG-99 k) and UG-100 e) are identical with respect to paint.
Vessels, except for those in lethal service, may be painted or otherwise coated either internally or externally, and may be lined internally, prior to the pressure test. However, the user is cautioned that such painting / coating /lining may mask leaks that would otherwise have been detected during the pressure test.

Section VIII Div 2
8.1.2 e)
Vessels may be painted or coated either internally or externally, and may be lined internally, prior to pressure testing. However, the application of paints, coatings and linings is not permitted prior to
hydrotest if the vessel is to contain fluids of such a nature that a very small amount mixed or unmixed with air is dangerous to life. The user is cautioned that the application of paints, coatings, or linings may mask leaks that would otherwise be detected during the pressure test.

In a nutshell, painting prior to pressure test will increase rework costs.

Johnson Madukayil

On Tue, Dec 1, 2009 at 3:07 AM, A D <alouis1972@yahoo.co.in> wrote:

Yes code allowed hydrotest with painting. Only painting is not allowed for sensitive leak test as per B31.3.   Prsently in my site we are carried out hydro test in painted condition (around we did 2000 package in my site in painted condition)   Louis Welding/Piping Inspector Cswip 3.1 and API 570 Inspector Singapore. --- On Mon, 30/11/09, daniel iordache <daniel.iordache@gmail.com> wrote: From: daniel iordache <daniel.iordache@gmail.com> Subject: [MW:3771] hydrotest b31.1 To: materials-welding@googlegroups.com Date: Monday, 30 November, 2009, 8:09 PM 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 -- 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.

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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.