Arrangement and design of the outlet pipe and suction pipe of self-priming sewage pump

Self-priming sewage pump pipeline layout
The laying of pipelines in sewage pumping stations is generally surface-mounted. The suction pipe is permanently placed on the ground, and the outlet pipe is usually installed overhead because the pump room is deep. It is usually installed on the bracket along the wall. The layout of the pipelines must not hinder the traffic and maintenance work in the pumping station. It is not allowed to install the pipelines above the electrical equipment. It must not interfere with the traffic and equipment lifting and maintenance in the station. The ground at the passage should not be less than 2.0m from the bottom of the pipeline. In order to facilitate installation and disassembly, the pipelines in the pumping station are generally flanged. Pipes and valves shall be protected against corrosion.
Design of water outlet pipe of self-priming sewage pump
1. The outlet pipe of the self-priming sewage pump The flow rate of the outlet pipe of the self-priming pump is generally not less than 1.5m / s. When two or more water pumps use a single outlet pipe and only one pump works, the flow rate must not be less than 0.7 m / s to avoid deposition in the tube. When the outlet pipe of the pump is connected to the outlet main pipe (connecting pipe), it must not be connected from the bottom of the dry pipe, so as to prevent the formation of silt in the outlet pipe of the pump when the pump stops running.
When two or more sewage pumps share one outlet pipe, the outlet pipe of each pump should be equipped with a valve, and a check valve should be set between the valve and the pump; if the water pump uses a separate outlet pipe, and it is a free outlet When flowing, check valves are generally not required, so the valve should be installed in the horizontal section as far as possible to prevent dirt from settling on the valve disc.
Design of suction pipe for self-priming sewage pump
2. Suction pipe of self-suction sewage pump Each self-suction pump should be provided with a separate suction pipe, and strive to be superior and short to improve hydraulic conditions, reduce head loss, and reduce the possibility of impurities blocking the pipeline.
The design flow rate of the suction pipe is generally 1.0-1.5m / s, and the superior low must not be lower than 0.7m / s. In order to facilitate the removal of the accumulated air in the suction pipe, the horizontal part of the suction pipe should be raised slightly along the direction of the water flow. The pipe slope can be 0.005. When the connection between the suction pipe and the pump needs to be tapered, an eccentric head should be used. The inlet of the suction pipe should be equipped with a bell mouth, whose diameter is 1.3-1.5 times the diameter of the suction pipe. The bell mouth is installed in the sump of the pool.
For self-filling type pumps, a valve should be installed on the suction pipe for maintenance. If the pump is not self-priming, vacuum pump or ejector should be used to start the water. It is not allowed to set a foot valve on the suction pipe. The foot valve is easily blocked in sewage, which affects the start of the pump, and increases water head loss and electricity Consuming.

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