Re: [MW:15960] Painting of spool before hydrotest

Dear Pradip,

 

Let me put it simple,

Hydrostatic and pnumetic define the medium of testing and leak and pressure define the conditions of testing.

You can have all together 4 possibilities.

Hydrostatic presure test

Hydrostatic leak test

Pnumetic pressure test

Pnumetic leak test

 

Leak test is conducted at operating pressure and pressure test is conducted at some specified presure above the operating one.

 

Painting of joints before leak / pressure test is a perameter more defined by client specifications then codes, in detail.

In my view, please refer to cilent specifications, In my experience we prime the joints without waiting for any kind of tests. One of the advantages of painting is that you can sometimes there is sufficient time gap between installation and testing and paints keeps your joints free of rust.

 

The term sensative leak test refers to any kind of test with some very special requirements, other than normal tests, in senstaive leak test the intensity and sensitivity of inspection is very high.

 

Regards,

 

Ammar Shaikh

On Sat, Nov 17, 2012 at 10:35 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

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