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Analysis of key points for suction pipe and outlet pipe of sewage self suction pump

Date£º2018-10-13

(1) Each sewage pump should be equipped with a separate suction pipe, and strive to minimize the water conservancy conditions, reduce head loss, can reduce the possibility of impurities plugging the pipe.

The design flow velocity of the suction pipe is generally 1.0-1.5m/s, the minimum must not be less than 0.7m/s, in order to avoid precipitation in the pipe. When the suction pipe is very short, the flow rate can be increased to 2.0~2.5m/s. In order to remove the accumulated air in the suction pipe, the horizontal part of the suction pipe should be slightly elevated along the direction of water flow. The pipe slope can be 0.005. When the connection between suction pipe and water pump needs to shrink gradually, eccentric head should be used. The mouth of the suction pipe should be equipped with a bell mouth, and its diameter is 1.3~1.5 times the diameter of the suction pipe. The bell mouth is installed in the water sump of the collecting pool.

Self priming pumps shall install valves on their suction pipes for maintenance. If the pump is not self-filling type of work, should use vacuum pump or water ejector to start, and not allow to set a bottom valve in the suction pipe, because the bottom valve in sewage easily blocked, affecting the start of the pump, and increase head loss and power consumption.

(2) Sewage pump outlet pipe sewage pump outlet pipe speed is generally not less than 1.5m/s, when two or more pumps with one outlet pipe and only one pump work, the flow rate should not be less than 0.7m/s, to avoid deposition in the pipe. When the outlet pipe of the pump is connected with the outlet pipe (connecting pipe), the bottom of the outlet pipe shall not be connected with the outlet pipe of the pump, so as to prevent the deposit in the outlet pipe of the pump when the pump stops running.

When two or more pumps use one outlet pipe, the outlet pipe of each pump should be equipped with a valve and a check valve between the valve and the pump; if the pump uses a separate outlet pipe and is free to flow, there is generally no check valve, all valves as far as possible in the horizontal section, so as not to deposit dirt on the valve disc. Up.

The installation of pipelines in sewage pumping stations is usually installed in Ming Dynasty. The suction pipes are permanently placed on the ground, and the outlet pipes are usually mounted on the bracket along the wall because the pump house is deep. The layout of the pipes shall not hinder the traffic and maintenance work in the pumping station, shall not allow the pipes to be installed over the electrical equipment, shall not hinder the traffic in the station, equipment hoisting and maintenance, and shall pay attention to the main points of the suction pipe and the outlet pipe of the local sewage pump at the passage. The main points of the suction pipe and the outlet pipe of the sewage pump shall not be less than 2.0m from the bottom of the pipe. The pipes should be stable. In order to facilitate installation and dismantling, flange connections are usually adopted in the pumping stations. Pipeline and valve shall take corresponding anticorrosion measures.