Reason for controlling the chloride ion content in water during the equipment’s hydrostatic test
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In GB150.4 as well as in various common project specifications, there are requirements to control the chloride ion content in the water during hydrostatic testing. What is the reason for this?
Prevent stress corrosion in austenitic stainless steel.
Chloride ions cause corrosion in austenitic stainless steel. As water evaporates, the chlorine content increases
The reason why the chloride content is controlled only during the hydrostatic testing of stainless steel equipment is that chloride ions cause corrosion to stainless steel materials :)
The corrosive effect of chloride ions on equipment is quite severe
The control of chloride ion content in water is required only when testing austenitic stainless steel containers under water pressure
Too high chloride levels can cause stress corrosion
It is mainly to prevent stress corrosion of stainless steel by chloride ions. But this requirement is a bit strict; under pressure testing conditions, the stress corrosion caused by chloride ions on stainless steel can be ignored.