Self - priming pump is a common type of pump in the south. The principle is to make use of the flow velocity of water, and the impeller drives the pump impeller to pump the water to the Bank of the river. The pump can be pumped into the river, but it must be in a hurry, or where there is a drop.

Layout method

1. the design velocity of the water pipe is generally 1.0-1.5m/s, and the minimum is not less than 0.7m/s. In order to facilitate the accumulation of water in the air duct to exclude the horizontal part of the suction pipe along the flow direction should be raised slightly, Guan Po can use 0.005. The suction pipe is connected with the water pump needs to gradually shrink, the eccentric head.

2. when two and more than two sewage pump with one outlet pipe, outlet pipe of each pump shall be fitted with a valve and a check valve between the valve and the pump; if the pump adopts separate outlet pipe, and free flow, the general can not be provided with a check valve installed in the valve, so as far as possible the horizontal section, so as to avoid the deposition of dirt on the valve disc.

3., the flow rate of the outlet pipe of the self suction sewage pump is generally less than 1.5m/s. When the two or more two pumps are combined with one outlet pipe and only one pump works, the flow rate can also be no less than 0.7m/s, so as to avoid deposition in the pipe. When the outlet pipe of the pump is connected to the outlet pipe (connecting pipe), it should not be connected to the bottom of the pipe, so as to prevent the pump from stopping operation, the silt in the outlet pipe of the pump is formed.

4. the suction pipe of self suction sewage pump shall set up a separate suction pipe for each self suction pump, and strive for the shortest in order to improve the hydraulic condition and reduce the loss of water head, so as to reduce the possibility of impurities blocking the pipeline.

5. self irrigation pump, the water pipe should be installed on the valve, so as to repair. If the pump is non self filling type work, should use a vacuum pump or a water ejector diversion starting, and does not allow water pipes set in the bottom valve, bottom valve for easy to plug in the sewage, affecting the pump starting, and increase the head loss and power consumption.

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