Dear Lassaad,
Austenitic stainless steel is effected with a damge mechanism named "cloride strees corrosion cracking". factor directly effecting are ..
1) cloride content ( incresing content of cloride will increase the tendency of CSSC)
2) temperature (increasing temperature will increase the tendency of CSSC)
3) PH value ( PH value increaseing to alkyline region will decrease the tendency of CSSC)
to avoide this most of the code limit this, but ASME VIII div 1 is a construction code and water quality will impact on life of equipment so there is no any restriction about the fluide except the temperature during hydrot test wich is also directly related to brittle behaviour to the material.
for further information please refer to client specification if nothing is there then read api 510
5.8.4 Hydrostatic Pressure Tests
5.8.4.2
Hydrostatic pressure tests of equipment having components of Type 300 series stainless steel should be conducted with
potable water or steam condensate having a chloride concentration of less than 50 ppm. After the test, the vessel should be completely
drained and dried. The inspector should verify the specified water quality is used and that the vessel has been drained and
dried."
On Wed, Sep 21, 2011 at 3:21 AM, lassaad mokrani <lassaad.mokrani@gmail.com> wrote:
Dear Experts,--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°CBest Regards,--
Meilleures salutations
Mokrani Lassaad
00216 20 649 755
http://www.linkedin.com/pub/lassaad-mokrani/16/364/907
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