Multistage centrifugal pump operation & maintenance

In the use of stainless steel multistage centrifugal pump, the first to determine the purpose and multistage pump performance parameters and choose the pump type.The principle of multistage pump and basis:
1, make the selected multistage pump type and performance in accordance with unit capacity and head, pressure, temperature, NPSH, the requirement of the process parameters such as suction.
2, multistage pump must meet the requirements of dielectric properties.
(1) for conveying inflammable, explosive or toxic or valuable medium pump, require no leakage of pump shaft sealing is reliable or adopted, such as magnetic pump (without shaft seal, driven by magnetic isolation type indirect);
(2) the multistage pump forhandling corrosive mediums, convection components with corrosion resistance materials, such as fluorine plastic corrosion pump;
(3) for conveying multi-stage pump, containing solid particles medium for convection part adopts wear-resisting material, use clean liquid wash shaft seal when necessary.
3, mechanical aspects of multistage pump of high reliability, low noise, small vibration.
4, correct calculation of multistage pump procurement costs, including purchasing cost and maintenance cost.

(1), check whether there is any loose phenomenon on multistage pump pipe road and the junction.Turn the multistage pump with the hand, and proved the multi-stage pump is flexible.
(2), the bearing body join bearing lubrication oil, should observe the oil level in oil mark the centerline, lubricating oil should be timely replacement or supplement.
(3), unscrewed the multistage pump pump body of water diversion plug, water perfusion (or plasma).
(4), close out of the water gate and export of pipeline pressure gauge and imported vacuum gauge.
(5), the motor running, and proved the motor steering is correct.
(6), multi-stage pump stopped for a long time, the pump must be opened entirely, dry the water, will turn the parts packed and junction coated with grease.
(7), try to control the capacity and head of the multistage pump, within the scope of the specified on the sign to ensure that the multistage pump running at peak efficiency, to achieve maximum energy saving effect.
(8), multi-stage pump in the process of operation, bearing temperature cannot exceed environment temperature to 35 c, the highest temperature should not exceed 80 c.
(9), in case of abnormal sound of a multistage pump should immediately stop check.
(10), multi-stage pump to stop using, first close the gate valve, pressure gauge, then stop the motor.
(11), multi-stage pump in the first months of work, the oil change 100 hours, after every 500 hours, the oil change at a time.
(12), multi-stage pump often adjust the packing gland, packing materials indoor drip situation is normal (in a drip out as appropriate).
(13), regularly check the wear condition of multistage pump shaft sleeve, wear after the larger should be replaced in a timely manner.
(14), multi-stage pump when used in cold winter season, parking, the lower part of pump body must be drain plug unscrewed the net medium.To prevent the frost crack.
(15), start the motor, after the multistage pump operation, open the outlet pressure gauge and imported vacuum pump after it shows that proper pressure, gradually open the gate valve, check the motor load condition at the same time.

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