The concentration of the chlorides by evaporation of hydrotest water remaining in the piping system may cause stress corrosion cracking of the piping near welds. Provisions must be made to ensure that hydrotest water is fully drained and/or flushed from the piping system. The water used for the hydrostatic test, apart from the requirements as to chloride content, shall be free from sediment or undissolved solids of any type
hydrotest water containing up to 20 mg/kg chlorides (20 parts per million or less) may be used for the pressure test of ASS.
Regds/Jignesh
From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of biju psl
Sent: Friday, March 19, 2010 4:43 PM
To: materials-welding@googlegroups.com
Subject: [MW:4582] corrosion problem in TP321 pipes after hydrotesting
Hi,
We have a 2"Sch-40 A312TP321 piping .We tested the above line 4 months before partially and accepted. Same line when we tested again now it started leaking at several locations(welds and pipe)We tested the water used for testing the line and found that the chloride content is 120ppm
Is it possible that just because of this high chloride content the line starts leaking within 3 months?
best regards,
BIJU
-- 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.
To unsubscribe from this group, send email to materials-welding+unsubscribegooglegroups.com or reply to this email with the words "REMOVE ME" as the subject.
No comments:
Post a Comment