The pumps should be of the same type, and the number of pumps should not be less than 2, and not more than 8. When the water volume changes greatly, water pumps of different specifications can be configured, but not more than two types, or use variable frequency speed regulation device, or use blade adjustable water pump. The sewage pump room and the combined sewage pump room should be equipped with pumps. When the number of working pumps is not more than 4, the number of standby pumps should be one. When the number of working pumps is not less than 5, the number of standby pumps should be 2; when there are 2 standby pumps in the submersible pump room, one can be reserved on site and one is reserved in stock. The rainwater pump room may not be equipped with pumps. The rainwater pump room on the interchange road may be equipped with standby pumps depending on the importance of the pump room.

Causes of pump cavitation 1. Air leakage in the inlet pipe. 2. The liquid level is too low and air is inhaled. 3. The inlet pipeline design is unreasonable, and the highest point is higher than the impeller (only refers to the suction of water). 4. The installation method is unreasonable. In some places, the atmospheric pressure is low, and the cavitation margin of the selected pump itself is large, or the pipe diameter is too small, and the resistance is large. It can only be used to suck water when inverted. 5. The pressure of liquid vaporization increases. 6. The type selection is wrong, and the pump deviates seriously from the optimal working point. 7. Eliminate the damage of the air valve, the air is not exhausted or other reasons cause the pipeline and pump body to not exhaust the air.

The pumps should be of the same type, and the number of pumps should not be less than 2, and not more than 8. When the water volume changes greatly, water pumps of different specifications can be configured, but not more than two types, or use variable frequency speed regulation device, or use blade adjustable water pump. The sewage pump room and the combined sewage pump room should be equipped with pumps. When the number of working pumps is not more than 4, the number of standby pumps should be one. When the number of working pumps is not less than 5, the number of standby pumps should be 2; when there are 2 standby pumps in the submersible pump room, one can be reserved on site and one is reserved in stock. The rainwater pump room may not be equipped with pumps. The rainwater pump room on the interchange road may be equipped with standby pumps depending on the importance of the pump room.

Causes of pump cavitation 1. Air leakage in the inlet pipe. 2. The liquid level is too low and air is inhaled. 3. The inlet pipeline design is unreasonable, and the highest point is higher than the impeller (only refers to the suction of water). 4. The installation method is unreasonable. In some places, the atmospheric pressure is low, and the cavitation margin of the selected pump itself is large, or the pipe diameter is too small, and the resistance is large. It can only be used to suck water when inverted. 5. The pressure of liquid vaporization increases. 6. The type selection is wrong, and the pump deviates seriously from the optimal working point. 7. Eliminate the damage of the air valve, the air is not exhausted or other reasons cause the pipeline and pump body to not exhaust the air.

Causes of pump cavitation 1. Air leakage in the inlet pipe. 2. The liquid level is too low and air is inhaled. 3. The inlet pipeline design is unreasonable, and the highest point is higher than the impeller (only refers to the suction of water). 4. The installation method is unreasonable. In some places, the atmospheric pressure is low, and the cavitation margin of the selected pump itself is large, or the pipe diameter is too small, and the resistance is large. It can only be used to suck water when inverted. 5. The pressure of liquid vaporization increases. 6. The type selection is wrong, and the pump deviates seriously from the optimal working point. 7. Eliminate the damage of the air valve, the air is not exhausted or other reasons cause the pipeline and pump body to not exhaust the air.

The pumps should be of the same type, and the number of pumps should not be less than 2, and not more than 8. When the water volume changes greatly, water pumps of different specifications can be configured, but not more than two types, or use variable frequency speed regulation device, or use blade adjustable water pump. The sewage pump room and the combined sewage pump room should be equipped with pumps. When the number of working pumps is not more than 4, the number of standby pumps should be one. When the number of working pumps is not less than 5, the number of standby pumps should be 2; when there are 2 standby pumps in the submersible pump room, one can be reserved on site and one is reserved in stock. The rainwater pump room may not be equipped with pumps. The rainwater pump room on the interchange road may be equipped with standby pumps depending on the importance of the pump room.

The pump is a general-purpose machine with a wide range of applications, and new fields of pumps continue to appear. For example: heart pumps, water jet propulsion pumps, computer cooling pumps, air conditioning pumps, heat transfer oil pumps, oil and gas mixing pumps, flue gas desulfurization pumps, oil platform water injection pumps, etc. There may still be places where pumps should be used instead of pumps, and new areas of pump use will continue to appear, which requires us to pay attention to discovery and devote ourselves to development.