Submersible pump technical requirements
   Hydraulic components
   Pump should be vertical coupling submersible pump; submersible motor directly connected with the pump impeller coaxial, hydraulic components from the pump housing, impeller. In order to ensure a stable flow without excessive vortexing, hydraulic components should be designed and manufactured without sharp edges and corners. Pump outlet pipe flange should be based on ISO standard nominal pressure 1MPa prevail.
   impeller
   Impeller should be non-clogging and non-overload characteristics of the spiral centrifugal impeller, with a soft forward driving force and centrifugal force, the long runner no sharp corners to ensure that the impeller in the sewage sludge transport will not produce clogging and destruction of sludge Like structure. Impeller in the hydraulic design, should be combined with the positive impetus and centrifugal force.
   Impeller should be dynamic balance, dynamic balancing accuracy should not be less than G6.3 level. Vigorous fierce vibration is not greater than 0.45mm / s.
   Motor
   Motor should be three-phase squirrel-cage motor, three-phase 380V, 50Hz, protection class IP68, F-class insulation. Motor configuration should ensure that any point in the H-Q curve work, there will be no overload, the motor should be able to start 12 times per hour. The temperature of the pump delivery medium is up to 40 ° C and the average temperature rise of the stator windings does not exceed 85 ° C.
   Motor cooling form should be straight-cooled, that is, the flow of water from the motor can flow around the motor cooling. Do not use cooling systems that rely on the pumped medium to the cooling circuit cooling and oil-filled motors.
   Submersible motors and pumps should be made by the same manufacturer, provided with a junction box of degree of protection IP68.
   Machinery Seal
   Each pump shall be provided with a series of sealed systems consisting of two separate seals.
   The mechanical seal should operate within the oil chamber, allowing the sealing surface to be properly lubricated.
   Mechanical seals should be maintenance-free, lubricated and separated from the liquid being transported, should be able to withstand thermal shock and have good emergency operation characteristics.
   The manufacturer shall ensure that the service life of the mechanical seal is not less than 30,000 hours.
   Wear lining
   The pump should be designed hydraulically so that the mud in the medium will only wear away the suction part of the pump and will not in any case wear on the casing. In the flared suction pump should be built-in flared wear lining, and the axial adjustable to keep the pump at any time the high efficiency, the material should be ductile iron or Brinell hardness of 450 high-chromium cast iron. To replace the wear liner during routine operation, simply remove the suction port of the pump and remove the motor part of the pump. Any other irregular shape, not adjustable, the replacement must be removed when the motor and other parts of the design will not be used.
   Cable and cable seal
   The motor shall be fitted with a submarine cable for control and power supply with a separate inlet for each cable and a reliable seal, with each cable individually sealed if the power cable is a multi-core cable. The cable should extend into the terminal compartment and be sealed with a reusable rubber seal, not sealed with resin or other potting material.
   Shafts and bearings
   Pump and motor shaft should be the same unit, pump shaft is the extension of the motor shaft, without or without any coupling.
   The pump / motor shaft should be supported on high quality permanently lubricated, roller bearing bearings designed to withstand all axial and radial forces.
   Thermal Protection
   Each motor is normally closed temperature sensor protection, three sensors should be connected in series, the thermostatic switch should be normally closed at ≤ 70 ℃, jump at 125 ℃. The thermal switch needs to be connected with the motor overload protection and connected to the control cabinet. The junction box should include the terminal board. Terminal plate with elastic O-ring and motor seal. Wiring board should be used to secure the long-term fixed-line compression rod and cable and stator cable into the line.
   To indicate bearing wear, a normally closed temperature sensor is located at each of the upper and lower bearings, and the temperature sensor should be disconnected until the spindle or other parts of the motor are severely damaged.
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