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How do manufacturers test the performance of sewage suction trucks and fecal suction trucks?

February 25, 2021

Before the sewage suction truck or fecal suction truck leaves the factory, the manufacturer needs to test the vehicle to ensure that the quality of the vehicle is qualified and the performance is normal. The inspection content includes the appearance of the sewage suction truck or the fecal suction truck, the external dimensions, and the weight of the entire vehicle. The most important test is the test of the sewage suction capacity of the sewage suction truck or the fecal suction truck. Now I will introduce part of the testing content and testing methods of sewage suction truck manufacturers.

Measurement of the maximum vacuum (pressure value) of the sewage suction truck Drain the water in the sewage suction truck tank, and close the tank tail cover, the sewage inlet and the sewage outlet ball valve. After the test starts, start the sewage suction truck, control the speed of the vacuum pump at the rated speed, and observe the maximum vacuum (pressure value) reading indicated by the pointer of the vacuum gauge. The continuous stable indication time cannot be less than 2 minutes.

Determination of suction depth of the suction truck The experimental pool prepared by the sewage suction truck manufacturer needs to have a large enough volume, and the height of the page does not exceed 50mm during the experiment. The parking place of the suction truck is flat, solid and has no slope. The vertical distance between the water surface and the parking surface of the suction truck is the design value of the suction depth of the suction truck. After the test starts, the vacuum pump speed is controlled at the rated speed and the effective volume of the tank is pumped.

When measuring the suction time of the sewage suction truck, the speed of the vacuum pump is controlled at the rated speed. The suction time starts from moving the valve until the page height reaches the maximum value specified by the design. It is timed by a stopwatch, measured three times, and averaged .

Determination of the time of pressurized discharge of the suction truck The sewage tank of the suction truck is filled with water to the maximum value specified in the design. During the test, the vacuum pump speed is controlled at the rated speed, and the drain time starts from moving the valve to the stop of all the liquid in the tank. Measure three times with a stopwatch and take the average value.

Measurement of the temperature rise of the vacuum pump during the operation of the sewage suction truck. The speed of the vacuum pump is controlled at the rated speed, and the temperature rise of the surface temperature of the vacuum pump shell is measured with a point thermometer when a tank of water is continuously pumped out. The minimum scale of the point thermometer is not more than 1 degree Celsius.

Leakage test of the suction and exhaust system of the suction truck All the welds and joint sealing parts of the tank are coated with soap liquid, and the vacuum pump of the vehicle is used to deliver compressed air into the tank. The system pressure reaches 150kpa and keeps it for 20 minutes. Observe the reading of the vacuum gauge and check whether there are bubbles in the soapy liquid area.

The test of the sewage suction truck or the fecal suction truck before leaving the factory is very important. Finding defects and faults during the test can ensure that the vehicle can run smoothly after it leaves the factory.

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