Everyone, please translate it
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The hydraulic test pump must have its oil cleaned; demineralized water must be used for the hydraulic testing and flushing of stainless steel pipelines. What does this mean? Hehe! !
The context may be needed to translate it smoothly. Try to translate the next sentence: Deionized water must be used for the hydraulic testing and flushing of stainless steel pipes.
Indeed, consider the context. What I understand is that before conducting a hydrostatic test, the pump used for applying pressure must be degreased to prevent oil contamination from affecting the pipes again; for ordinary pipes, there are specific requirements regarding oil removal to avoid impacting the manufacturing process. The latter sentence states that for hydrostatic testing and water flushing, desalinated water is the best choice; generally, the chloride content in desalinated water used in chemical plants is required to be below 30PPM, in order to prevent chloride ions from causing corrosion to stainless steel pipes and equipment.