Control of chloride ion content in water for hydrostatic testing
Thread Content
During hydrostatic testing, the chloride content in the water needs to be controlled – are there any standards specifying this?
There are requirements for stainless steel, right? Are there any requirements for the others as well?
It is specified in GB/T150.4-2011.
Controlling it at 25mg/L is a requirement specified in GB150 for stainless steel containers; this is mainly to prevent the evaporation of residual water after hydrostatic testing, which could lead to the concentration of chloride ions, as well as to avoid corrosion of ordinary stainless steel caused by the prolonged presence of liquid.
It was also said later that it’s impossible to drain and clean it thoroughly
If it can be dried immediately, this should be checked to avoid prolonged corrosion of the container by the concentrated chloride solution; therefore, the requirement for drying can be relaxed after such measures are taken.
Page 338 in GB/T150
GB50235 seems to have it too