Multi-stage pump selection

When using a stainless steel multistage pump, first determine the purpose and performance parameters of the multistage pump and select the pump type. Select multi-stage pump principles and basis:

1. Make the type and performance of the selected multistage pump comply with the process parameters such as device flow, lift, pressure, temperature, NPSH, suction and so on.

2, multi-stage pump must meet the characteristics of the media requirements.

(1) Pumps that deliver flammable, explosive toxic or valuable media require a reliable shaft seal or a leak-free pump, such as a magnetic pump (without shaft seal, indirectly driven by isolated magnetism);

(2) For multi-stage pumps conveying corrosive media, convection parts are required to be made of corrosion-resistant materials such as fluorine plastic corrosion-resistant pump;

(3) For conveying multi-stage pumps containing solid particulate media, convection parts are required to be wear-resistant, and if necessary, the shaft seal is rinsed with a cleaning fluid.

3, the mechanical requirements of multi-stage pump high reliability, low noise, small vibration.

4, Correct calculation of multistage pump procurement input costs, including procurement costs and installation and maintenance costs.

Multi-stage pump maintenance and care

(1), check the multi-stage pump lines and joints with loose phenomenon. Turn the multi-stage pump by hand to see if the multi-stage pump is flexible.

(2) Add bearing lubricating oil to the bearing body, observe the oil level should be at the center line of the oil standard, and the lubricating oil should be replaced or replenished promptly.

(3), unscrew the multi-stage pump head diversion plug, pouring water (or pulp).

(4), close the outlet valve and outlet pressure gauges and imported vacuum gauge.

(5), move the motor, try to see whether the motor steering is correct.

(6), multi-stage pump long-term deactivation, the pump should be all open, dry the water, the rotating parts and joints coated with grease installed.

(7), try to control the multi-stage pump flow and head in the range indicated on the sign to ensure that multi-stage pump at maximum efficiency point of operation, in order to get the maximum energy-saving effect.

(8), multi-stage pump in operation, the bearing temperature can not exceed the ambient temperature 35C, the maximum temperature shall not exceed 80C.

(9), if it is found that multi-stage pump has an abnormal sound should stop immediately check the reasons.

(10), multi-stage pump to stop using, first close the gate valve, pressure gauge, and then stop the motor.

(11), multi-stage pump in the first month of work, after 100 hours to replace the oil, after every 500 hours, oil change time.

(12), multi-stage pump often adjust the packing gland to ensure normal drip filling room (in drops as leakage).

(13), regular inspection of multi-stage pump sleeve wear, wear should be promptly replaced.

(14), multi-stage pump in the winter season when used, after parking, you need to unscrew the lower part of the drain plug to drain the media to the net. Prevent cracking.

(15), start the motor, when the multi-stage pump is running, open the outlet pressure gauge and inlet vacuum pump as it shows the appropriate pressure, and gradually open the gate valve, while checking the motor load conditions.

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