For pressure testing of stainless steel pipes, fresh water is used; the chloride ion level is too high. Is it possible to conduct a short-duration pressure test?
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For the pressure testing of stainless steel pipes, fresh water is used; however, if the chloride ion level is too high, the pipes are purged after the testing is completed. What impacts can excessive chloride ions during short-term pressure testing have on the stainless steel pipes and their subsequent use? Is it possible to do this? Thank you.
There’s no problem for a short time. The main thing is to clean it up afterwards to prevent chlorine buildup.
Check the chloride level in your fresh water; if it’s not too high (the standard is 25 ppm), then there’s no problem. However, when drafting the water pressure testing plan, it should be specified that the chloride level in the water is below 25 ppm
What’s this new thing of yours? The chloride content in the tap water here by the sea is below 16 ppm, which meets the requirements.
Chloride ions can be as low as 25 ppm
According to standard specifications, it is definitely not allowed. However, as long as the supervisor and the owner agree and there is a solution in place, such as carrying out cleaning and purging within a short period of time, this can prevent the destructive effect of chloride ions on the passivation layer of stainless steel, thereby avoiding direct contact with the metal that would lead to corrosion
Dry out water with excessive chloride levels as soon as possible after use
It’s not allowed according to the operating instructions; what kind of new rule is this?
We used fresh water for the pressure testing, and we didn’t consider this issue at all :(
Requirements for chloride ions, in order to prevent chlorine corrosion