Dear Asad,
I assume that you mean the amount of Chlorides in the water used for Hydrostatic testing when speaking about less than 50 PPM. This is a requirement in order to ensure no pitting corrosion or crevice corrosion occurs during testing and /or afterwards when system is not properly dried. Regarding the PH value I’m not sure but I think that this is related to the same issue.
Because Pickling and Passivation will be executed after Hydrostatic Test the material will be more sensitive for such kind of attacks because of oxidation of the surface near to weld connections.
Met vriendelijke groeten / Best Regards
Herman Pieper
Pieper Quality Support & Inspection
Phone: +31 (0)521 380083
Fax: +31 (0)84 7539225
Cell: +31 (0)6 51691215
www.pieper-qsi.nl
Van: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] Namens asad azmi
Verzonden: zaterdag 10 september 2011 8:28
Aan: materials-welding@googlegroups.com
Onderwerp: [MW:12401] effect of higher PPM/PH Value of Hydrotest water on SS Materials
dear all,
as per the clients requirments Hydrotest water used for testing Stainless Steel Vessels shall have PPM Value less than 50 & PH Value shall be between 10 to 11.
what will be the effect on the SS material if PH Value is more than 11 & PPM value is more than 50.
be informed that Pickling & Passivation will be done after Hydrotest.
Please inform the effect of higher PPM & PH value on SS material.
if possible pls provide any technical information on this.
Thanks & Regards
Asad Azmi
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