Axial segmental multistage high pressure centrifugal pump is used in boiler water supply system because of its high head. For the debugging of this kind of pump, the main need to consider the following situations.
水泵调试前准备:
Preparation before pump commissioning:
1，入口阀门已经打开，泵体已经注满水。
The inlet valve is open and the pump is filled with water.
2，由于试车，新管路系统一般有杂质，需要考虑在新泵入口加装滤网，滤网目数视管路清洁度实际情况。
Due to the test run, the new pipeline system is generally impurities, it is necessary to consider the new pump inlet to install a filter screen, the number of filter screen depends on the actual cleanliness of the pipeline.
Outlet valve closed, low flow valve open. Some pumps are also equippedwith a mechanical seal flushing scheme, which needs to be compared with the manufacturer's information to ensure that the sealed water system operates normally in accordance with the design. Some pumps are also equipped with bearing lubricating oil systems, which need to ensure the normal operation of the lubricating oil system - oil quantity, oil temperature, oil speed and oil cleanliness in normal values.
Before starting the pump, it is necessary to confirm that the motor steering is consistent with the pump. The water pump has been aligned with the motor, and the median of the axial and radial alignment meets the requirements. Check the alignment before connecting the pipeline, and check the alignment again after connecting the pipeline to ensure that the pipeline does not cause excessive stress on the pump. If the drive is not a motor, some large feed pumps use a small steam turbine to drive the water pump. In this case, the deviation of the thermal working state of the steam turbine needs to be compensated and adjusted.
Field test pump, generally use outlet small flow line, so that the pump in the case of non-working conditions, under the condition of strict test pump operating parameters. Flow RATE, HEAD (PRESSURE), MOTOR CURRENT, SPEED, PUMP VIBRATION (driven and NON-driven - horizontal, axial, radial), motor vibration, noise, temperature, etc.
Precautions for pump test: For multistage high-pressure centrifugal pump, it is not possible to open the outlet valve to start the pump without back pressure at the outlet. Too high axial force will scrap the whole pump instantly. Outlet valve closed until pressure stabilizes, slowly open valve to operating point. Just as a hungry person cannot eat a large meal at once. Digestive disorders can occur.
7，泵变频启动，时间不能太长或太短，启动时间长，会使泵出现咬死的情况发生。
Pump frequency conversion start, the time can not be too long or too short, long start time, the pump will be seized.
