Re: [MW:15986] Painting of spool before hydrotest

Dear sir,

 The paint film not capable  withstand the elevated  pressure during the Leak test by using  pressure or vacuum.one you completed the leak test you can't do the surface preparation by using  sand blasting or git blasting method  prior to apply the primmer coat paint. Better you can go ahead with the surface preparation and then  apply least one primer coat paint  before performing the leak test. Other wise the painting  surface will contaminated during the time interval  of leak test.

beat regards

Bijoy joseph

On Sat, Nov 17, 2012 at 11:05 AM, pradip kumar sil <pradipsil@gmail.com> wrote:

Dear Everyboby,
As per ASME B-31.3 para 345.3.1 says  "All joints may be primed &
painted prior to leak testing unless a sensitive leak test (para.
345.8) is required.
But as per ASME SEC V Shows leak test  comes under :
The specific test method(s) or technique(s) and Glossary of terms of
the method in this article are describe in mandatory appendices I
through X & non mandatory appendix A as follows:
Appendix I—Bubble Test—Direct Pressure Technique
Appendix II—Bubble Test—Vacuum Box Technique
Appendix III — Halogen Diode Detector Probe Test
Appendix IV — Helium Mass Spectrometer Test —
Detector Probe Technique
Appendix V — Helium Mass Spectrometer Test —
Tracer Probe Technique
Appendix VI — Pressure Change Test
Appendix VII — Glossary of Terms
Appendix VIII — Thermal Conductivity Detector
Probe Test
Appendix IX — Helium Mass Spectrometer Test —
Hood Technique
Appendix X — Ultrasonic Leak Detector Test
My question is HYDROTEST & PHENEUMATIC test   is comes under leak test
as per ASME B-31.3 para 435.3.1.  Can we  paint the spool joint before
hydrotest.
 Any referances for hydrotest/phenumatic test comes under leak test.
Regards
Pradip

--
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/
http://www.linkedin.com/groups/MaterialsWelding-122787?home=&gid=122787&trk=anet_ug_hm

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.

--
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/
http://www.linkedin.com/groups/MaterialsWelding-122787?home=&gid=122787&trk=anet_ug_hm
 
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.