Self-priming pump installation
1, the direct drive pump and the motor should pay attention to the coaxiality of the pump shaft and the motor output; pump installation accuracy or not on the smooth operation of the pump and have a greater impact on the service life, it must be carefully installed And correction.
2, the pump coupling must be tightened with the mother, and lock the nut, to prevent the mother loose, otherwise easy to cause the impeller to move, resulting in mechanical failure.
3, in order to pump the body to maintain a certain amount of storage solution, in order to achieve better self-priming capacity and prevent mechanical seal dry friction, the pump must be imported higher than the shaft centerline.
4, the suction pipe installation should note:
a. Suction inlet installation height can not exceed 5 meters, when conditions permit, the suction inlet installation height should be as low as possible in the pool of the lowest storage level, and try to short suction pipe length, less elbow, so there Benefit from short self-absorption time, improve self-absorption function.
b. Inhalation pipeline valves, flanges, etc. should be strictly prevent leakage or leakage of liquid, that is, the suction pipe is not allowed to have leakage phenomenon.
c. Pumps should be prevented from inhaling solids and other debris, this suction pipe should be set on the filter. The effective flow area of the filter should be 2-3 times the cross section of the suction pipe. The filter should be checked regularly.
d. The suction line and discharge line should have their own support, the pump itself is not allowed to withstand the pipeline load.
5, the pump is installed, should make the electrostatic resistance of the pump and pipeline to meet the requirements of its grounding resistance.
6, the installation should be strictly seized pump casing and piping in the presence of stones, iron sand and other debris.
7, correction of pump coupling and motor coupling installation clearance and coaxiality, its different axis tolerance is 0.1 mm. The difference between the pump shaft and motor shaft height can be adjusted on the foot pad copper or iron.
8, 3-4 hours after the actual operation of the unit, for the final inspection, if no adverse phenomena, then that installation has been properly carried out in the test run should check the bearing temperature, the bearing body temperature should not exceed 70 ℃.
9, the pump bearing body cooling unit with a cooling water connector for the hole with Φ12 hose or plastic pipe, the thread size M12 × 1.75.
10, if the pump outlet pipe is equipped with a one-way valve in the process of self-priming can not make the pump discharge gas smoothly, should be added in the pump outlet exhaust pipe and valve.
Self-priming pump use
(A), before the start of the preparation and inspection work:
1. This series of self-priming pump, according to the working conditions of the pump, respectively, using high-quality calcium-based butter and No. 10 oil lubrication, if the pump with butter lubrication should be regularly filled with grease into the bearing housing. If the oil level is insufficient, add enough.
2, check the pump shell liquid is higher than the upper edge of the impeller.If not enough.From the pump housing on the liquid directly into the pump body into the reservoir, should not start under the condition of lack of liquid storage, Otherwise, the pump will not work properly and the mechanical seal will be damaged.
3, check whether the rotating parts of the pump stuck magnetic touch phenomenon.
4. Check the pump foot and the joints at the nut loose or not.
5. Check the coaxiality and parallelism of pump shaft and motor shaft.
6. Check whether the imported pipeline leakage, if leaks, we must try to rule out.
7. Open the suction line valve. Slightly open (do not open) the outlet control valve.
(B), start and operation:
1. Jog pump, pay attention to the steering shaft is correct.
2. Note that there is no abnormal rotation when the sound and vibration.
3. Note the pressure gauge and vacuum gauge reading.After the start when the pressure gauge and vacuum gauge readings after a period of fluctuations in the instructions and stability, indicating that the pump has liquid, into the normal infusion operation.
4. In the pump into the normal infusion operation before the self-absorption process should pay special attention to the pump temperature rise, if this process is too long, the pump temperature is too high, then stop the pump to check the reason.
5. If the pump fluid temperature is too high and cause self-absorption difficulties, then you can temporarily shut down. Use the discharge pipe back to the pump back to the liquid pump or pump to the liquid storage port directly to the pump replenishment. The pump liquid cooling. Then start.
6. Pump in the course of work as a strong vibration and exposure, there may be pump cavitation caused by cavitation have two reasons: First, the import pipe flow rate is too large. Second, the suction stroke is too high. When the flow rate is too large, the outlet control valve can be adjusted to increase the pressure gauge readings, when the import pipeline is blocked should be promptly ruled out: Suction stroke may be appropriate to reduce the pump installation height.
7. Pump in the course of work for some reason to stop the pump. Need to restart. Exit control valve should be slightly open (do not fully closed) This is conducive to self-priming gas discharge from the spit, but also to ensure that the pump in the lighter Start under load.
8. Pay attention to check the pipeline system for leakage.
(C), stop pump:
1. The gate valve on the discharge line must first be closed.
2. Stop the pump.
3 in the cold season, the pump should be the body fluid and bearing housing cooling water to vent, to prevent cracking parts
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