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What are the characteristics of fire pump operating procedures and sewage pump impeller structure?

2020-08-08
 When the fire pump is in operation, it must strictly follow the fire pump operating regulations to ensure safety and normal operation. The fire pump operating procedures are mainly divided into three parts, one is the inspection before starting, the other is during operation, and the third is the post-maintenance. The following is a detailed introduction for everyone.
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The main purpose of the fire pump operating procedures is to ensure the safety and correctness of the operation. The procedures are applicable to fire-fighting equipment in buildings.
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1. Check before starting
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1. Check the process valve switching conditions, and whether the corresponding return valve switching conditions meet the requirements.
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(1) During the daily test of the pump, the return valve should be fully opened and the valve block valve should be in the closed position. When trying 1#foam pump and 2# pump foam outlet, it is necessary to close the inlet valves of Vp111, Vp112, and Vp212, and open the Px021 return valve to start the pump; try 2# pump water outlet, 3#, 4# fire pump It is necessary to open the Px011 reflux valve to start the pump. After testing the pump, restore all valves to the specified state.
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(2) When an emergency occurs or water is needed for fire drills, open the valve in the valve block corresponding to the position where fire water (foam) is needed, and the return valve is closed.
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(3) The inlet valve of the pump must have a normally open and the outlet valve is in the closed position.
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2. Check that the clutch handle of the vacuum suction device should be in the "close" position.
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3.Open the air release valve and close the air release valve after resetting the float assembly.

2. Operation steps of starting and stopping the pump
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1. After starting the pump, check the running current of the motor and whether the pump is running normally. If there is any abnormality, stop the pump immediately.
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2. Observe the pressure gauge at the outlet of the pump. When the pointer of the pressure gauge reaches the rated working pressure and is stable, gradually open the outlet valve to try to make the pump work under the rated state.
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3. After the pump is filled with water normally, move the clutch handle of the vacuum suction device to the "div" position.
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4. Observe the pressure of the valve group. The pressure of the clean water valve group is kept at about 0.8Mpa, and the foam valve group is kept at about 1.0Mpa. If the pressure cannot be maintained, adjust the pump outlet and return valve to control the pressure.
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5. The temperature of the pump and motor bearings should be checked frequently, the high temperature should not exceed 75 degrees, and the working current of the motor should be within the normal range.
Pump impellers and pressure chambers such as sewage pumps are the two core elements of sewage pumps. The pros and cons of its performance means the superior performance of the pump. The anti-clogging performance, efficiency and cavitation performance of the sewage sewage pump are guaranteed by the two components of the vane pump and the pressurized water chamber.
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The working principle of the sewage sewage pump and the characteristics of the sewage sewage pump belong to a kind of non-clogging pump, which has many forms: such as submersible and dry two types, the usual submersible sewage pump WQ type submersible sewage pump, and the common dry sewage There are two types of pumps, such as W-type horizontal sewage pump and WL-type vertical sewage pump. Mainly used to transport urban sewage, feces or liquids containing fibers. For the medium with solid particles, the temperature of the conveyed medium is usually not more than 80℃. Because the conveyed medium contains fibers that are easy to entangle or bunch. Therefore, it is easy to block the pump flow channel. Once the pump is blocked, the pump will not work properly, and even the motor will be burned, resulting in poor sewage discharge. It has a serious impact on urban life and environmental pollution. Therefore, an important factor in blocking resistance and reliability is the quality of the sewage pump.