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[MW:12498] RE: HYDROTEST WATER

By Materials & Welding
Hi Lassad,
 
To the best of my knowledge ASME Sec VIII, DIV-1 does not have  any clear requirement on the quality of water for hydro test. However 50 ppm or below is considered to be the good engineering practice for austenitic stainless steels and other austenitic alloys.
 
Some of the API documents  have clear requirements (see below). You may follow the guidelines below and decide the best for the vessels.
 
The chloride restriction is primarily to prevent pitting corrosion and any form of stress corrosion cracking which may get induced from the stagnated water. As the  maximum operating temperature is 21 deg C , it's not a very conducive temperature to generate for originating SCC in 316L S.S. However no one has control on service induced damages.
 
In absence of any client requirements I would think that 50 ppm criteria would be a good judgement call.
 
Thanks.
 
Pradip Goswami,P.Eng.IWE
Welding & Metallurgical Specialist & Consultant
Ontario,Canada.
Email-pgoswami@sympatico.ca,
 
Chloride Limitation in Hydrotest/Rinsing Water

Codes and STD / Paragraph / Limitation / Remark
  1. API 560 (Fired Heater) / 14.5.1.3 / Max. 50ppm for ASS / Hydro Test Water
  2. API RP573 (Inspection for Fired Boiler and Heater) / 8.4.1 / Max. 50ppm for ASS / Hydro Test Water
  3. API 650 (Storage Tank) / S.4.10.1 / Max. 50ppm for SS / Hydro Test Water
  4. API 650 (Storage Tank) / S.4.9.2 / Max. 200ppm at T<40C and  Max. 100ppm at 40C<T<65C / Rinsing Water for Cleaning /Pickling
  5. API 661 (Air Cooled H/EX) / 10.3.3 / Max. 50ppm for ASS or Ni-Cu Alloys / Hydro Test Water
  6. API 660 (Shell & Tube H/EX) / 10.3.4 / Max. 20ppm for ASS / Hydro Test Water


From: lassaad mokrani [mailto:lassaad.mokrani@gmail.com]
Sent: Wednesday, September 21, 2011 4:16 AM
To: pgoswami
Subject: HYDROTEST WATER

Dear Sir,
Could you inform me if there an obligation in ASME IIIV Div 1, about the quality of hydrotest water.
Our 2 vessels are in SS 316L with operating temperatures respectively 21°C and -5°C

Best Regards,


Mokrani Lassaad
00216 20 649 755
http://www.linkedin.com/pub/lassaad-mokrani/16/364/907


















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