Valve is the most common equipment in chemical enterprises, seemingly easy to install valves, but if not in accordance with the relevant technology, it will cause safety accidents……
Taboo 1
Winter construction under negative temperature hydraulic test.
Consequences: because the tube freezes quickly during the hydraulic test, the tube is frozen.
Measures: try to carry out hydraulic test before winter application, and after the pressure test to blow the water, especially the water in the valve must be removed in the net, otherwise the valve is light rust, heavy frozen crack.
The project must be carried out in winter, under the indoor positive temperature, and the water should be blown clean after the pressure test.
Taboo 2
The pipeline system is not washed seriously before completion, and the flow rate and speed can not meet the requirements of pipeline flushing. Even with the hydraulic strength test discharge instead of flushing.
Consequences: the water quality can not meet the requirements of the pipeline system operation, often will also cause the pipeline section reduction or blockage.
Measures: rinse the system with maximum juice flow rate or not less than 3 m/s. The color and transparency of the water at the outlet shall be consistent with the water color and transparency of the inlet water.
Taboo 3
Sewage, rainwater and condensate pipes are concealed without closed water test.
Consequences: may cause water leakage, and cause user losses.
Measures: the closed water test work should be checked and accepted in strict accordance with the specifications. Underground buried, ceiling, pipe room and other hidden sewage, rainwater, condensate pipes to ensure that no seepage and leakage.
Taboo 4
During the hydraulic strength test and tightness test of the pipeline system, only observe the change of pressure value and water level, and the leakage inspection is not enough.
Consequences: leakage occurs after operation, affecting the normal use.
Measures: When the pipeline system is tested according to the design requirements and construction specifications, in addition to recording the pressure value or water level change within the specified time, especially carefully check whether there is a leakage problem.
Taboo 5
Butterfly valve flange plate with ordinary valve flange plate.
Consequences: butterfly valve flange plate and ordinary valve flange plate size is different, some flange inner diameter is small, and the butterfly valve disc is large, resulting in not open or hard open and make the valve damage.
Measures: the flange plate should be processed according to the actual size of the butterfly valve flange.
Taboo 6
There are no reserved holes and embedded parts in the construction of the building structure, or the size of the reserved holes is too small and the embedded parts are not marked.
Consequences: in the construction of the heating project, chisel the building structure, and even cut off the stressed steel bar, affecting the safety performance of the building.
Measures: carefully familiar with the construction drawings of heating engineering, according to the needs of pipeline and support and hanger installation, actively and seriously cooperate with the construction of reserved holes and embedded parts, specifically refer to the design requirements and construction specifications.
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Post time: Jan-18-2024
