What is the impact of chemical pump installation pipe size on pump performance?

　　Chemical pumps are commonly used in the production of equipment, in the installation of pumps, pipelines and pumps in and out of the size of the caliber of the requirements, the size of the pipeline on the performance of the pump what is the impact?

　　First, the size of the import and export of pumps and pipes

　　Pump inlet is generally larger than the outlet, because the suction port for low pressure, water density is small flow rate is slow, in order to meet the requirements of the water supply balance and to ensure that the inlet has a certain pressure, to prevent vapor corrosion, generally large; outlet flow rate is fast, the same diameter flow, so the decision to connect the suction port to be larger than the outlet of the water, the mouth of the pipe diameter is large suction resistance is small, conducive to the pump suction medium, the outlet pipe diameter is small, conducive to the pump outlet pressure to maintain.

　　Usually the pump suction port diameter is generally larger than the outlet pipe diameter, according to the different pipe diameter suction pipe flow velocity is different, pipe diameter less than 250 for 1 ~ 1.2 m / s, pipe diameter 250 ~ 1000 1.2 ~ 1.6 m / s, from the technical considerations, the large speed of the water flow should be no more than 2.5 ~ 3.0 m / s, the small speed shall not be less than 0.6 m / s (to prevent sedimentation).

　　Second, what are the requirements of the pipeline when installing the pump

　　The installation of pump import and export piping should be noted:

　　1, suction and discharge piping should have brackets. In general the pump should not bear the pipeline load.

　　2、In order to prevent the pump from inverting and being impacted by water hammer when the power is suddenly cut off, the discharge pipeline should be installed with a backstop valve and installed behind the gate valve.

　　3, in the discharge pipeline to install pressure gauges to observe the system and pump operating conditions, pay attention to try to avoid elbows and valves to avoid errors.

　　4, for parallel operation of the pump suction pipe, if connected to the common mother pipe, often the inlet pressure imbalance occurs, so it should be independent of the inlet pipe.

　　5, in order to regulate the working condition of the pump, the discharge pipeline should be installed with a gate valve or globe valve.

　　6, the suction piping arrangement, must try to make from the suction surface to the pump with an upward slope (1/50 or so) so that the pipeline does not store air. But when the pipe is submerged underwater, from the suction pipe to the pump to take down the slope.

　　7, when there is a variable diameter pipe, in order to prevent air accumulation, do not use concentric pipe, but the choice of eccentric pipe.

　　8, the pipeline is installed, with the design pressure 1.5 times the pressure hydrostatic test, there shall be no leakage, seepage phenomenon.

　　9、Flexible connection should be provided for large pipelines to minimize the impact on the pump caused by pipeline misalignment errors, pipeline expansion and contraction, and foundation subsidence.

　　10, in order to prevent air leakage, as far as possible, the suction pipeline flange connection. Suction port leakage is very difficult to find, should be careful.

　　11, the inhalation pipeline should try to avoid the installation of instruments and meters, elbows, reducers and other parts of the flow to avoid irregularities in the measurement of the impact.

　　12, the inlet pipeline should be set up filtering devices or dirt-blocking equipment to avoid impurities into the pump for circulation. And regularly remove dirt to prevent clogging of the inlet pipeline.

　　13, installed in the suction side of the gate valve, in order to avoid the accumulation of air, should be installed into the horizontal direction or downward tilt.

　　14, the bending parts as far as possible to do gentle, reduce the number of elbows, and to try to avoid setting up in close proximity to the inlet part of the pump.