Skip to main content

[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


















P     Pensez environnement! N'imprimez ce mail que si c'est vraiment nécessaire
Please consider your environmental responsibility before printing this e-mail


This e-mail is confidential and it is intended only for the addressees. Any
review, dissemination, distribution, or copying of this message by persons
or entities other than the intended recipient is prohibited. If you have
received this e-mail in error, kindly notify us immediately by telephone or
e-mail and delete the message from your system. The sender does not accept
liability for any errors or omissions in the contents of this message which
may arise as a result of the e-mail transmission

Comments

Post a Comment

Popular posts from this blog

Re: [MW:34105] SA266 GR4N 4 Cycle SPWHT

By Materials & Welding
Hi,  You are correct, Minimum refers to the one cycle for which this part will expose until final work shop PWHT. hence mill test certificate shall include this.  Max. SPWHT, refers to additional cycles of heat treatment that are reserved for future repairs during equipment lifetime.  Again, these simulated no. Of cycles shall be specified in MTC.  The idea is we need to make sure that steel mechanical properties are not compromised upon exposure to multiple repairs (i e 4 cycles in your case).  One could say, if steel is subjected to 4 cycles and is ok, then it should by defacto be good for one cycle, yet, this is wrong assumption cause mechanical problems and microstructure of materials varies accordingly based on no. Of cycles for which material will expose. This is apparent in alloy steel and especially for impact test values as an example.  In your case, this forged CS with properties before PWHT can be understood to be " as forged" condition (i.e. Wit...
Post a Comment
Read more

Materails FAQs

By Materials & Welding
Q: What are equivalents for standard Q 235 B (and Q 235 A) for U-channels? (asked by: boris.vielhaber@vait.com) A: DIN Nr. = 2393 T.2, 2394 T.2, EN 10025 W. Nr. DIN 17007 = 1.0038 Design DIN 17006 = RSt 37-2, S235JRG2 (Fe 360 B) Q: What is St DIN 2391 BK material? (asked by: dmcandrews@automaticstamp.com) A: Precision steel tubes, cold-finished/hard. Q: What is C.D.W. Boiler Tube? (asked by: montydude123@yahoo.com) A: Cold Drawn Welded Boiler Tube. Q: WHAT IS W.Nr. 1.4301? PLS TELL US IN EASY LANGUAGUE (asked...
21 comments
Read more

Heat tint (temper) colours on stainless steel surfaces heated in air // Heat tint

By Materials & Welding
Introduction The colour formed when stainless steel is heated, either in a furnace application or in the heat affected zone of welds, is dependent on several factors that are related to the oxidation resistance of the steel. The heat tint or temper colour formed is caused by the progressive thickening of the surface oxide layer and so, as temperature is increased, the colours change.   Oxidation resistance of stainless steels However, there are several factors that affect the degree of colour change and so there is no a single table of colour and temperature that represents all cases. The colours formed can only be used as an indication of the temperature to which the steel has been heated. Factors affecting the heat tint colours formed Steel composition The chromium content is the most important single factor affecting oxidation resistance. The higher the chromium, the more heat resistant the steel and so the development of the heat tint colou...
Post a Comment
Read more