1.Winter construction avoid water pressure test under negative temperature.
2.The pipe system is not washed carefully before completion, and the temperature and speed cannot meet the requirements of pipe washing.
3.Sewage, rainwater, condensate pipe do not do closed water test.
4.In the water pressure strength test and tightness test of pipeline system, only the pressure value and water level change are observed.
5.The butterfly valve flange uses an ordinary flange.
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