Q&A

• Electricity

1.Check working voltage and flow current of submersible water pumps regularly
2.Check thermal insulation resistance of the submersible pump to the ground regularly. After it works for 4-6 hours, stop the pump and check with megger, the insulation resistance of motor winding to ground should be no less than 0.5 MΩ.
3.Before operating, check sensitivity of thermal relay and working conditions of other protective devices
4.Check if cable is broken or not. For oil filled submerged pumps, pay special attention on bad effects caused by oil leaking to cable insulation rubber

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• Machinery

1.Check mechanical sealing conditions frequently and regularly. Open oil hole screw, release a small amount of oil, if water mixed in oil, it means grinding block sealing appears leakage. Then sealing box should be changed and new cooling oil must be added. If lack of oil or oil quality is in bad conditions, it should be filled with full clean oil immediately.
2.For new pump, after working for 50 hours, customers should unscrew waterproof sealing plug, and check oil or water leakage. Sealing system is in correct condition and can still be used when leakage is smaller than 5ml. If larger than 5ml, release all the water or oil and then tighten sealing plug, recheck it after 50 hours working.
3.Check the vibration conditions of motor.
4.Check bearings regularly, see if it appears leakage or is waiting to be changed.

• Others

1.Check if inlet filter is blocked and impeller condition
2.When pump kept unused for long time, take it out of water and storage in a dry and ventilated room
3.After working for one or two years, check and clean motor core pulling. If it is covered with dirty mud, immerse it into washing liquid for cleansing.

Vertical pumps and horizontal pumps are two kinds of pumps installation methods. As name suggests, vertical pumps are installed vertically, while horizontal pumps are installed horizontally. Apart from this, what else differences between the two types? And how do we choose between them?

1. Connection Method

Vertical pumps need to be connected vertically from up to down, impeller and motor are linked vertically too. Horizontal pumps need to be installed horizontally on the set, motor and impeller are linked through coupling, but it needs to be corrected regularly.

2.Occupation

Vertical pumps occupy less space than horizontal do. As horizontal pumps are equipped with set, customers need to set base on the ground. Inlet and outlet size of vertical pumps are the same and both lie in the same line.

3.Repair and Maintain

Repair of vertical pumps is more difficult and complex than horizontal pumps, all the upper parts are to be removed in repairing. However, horizontal pumps need only remove broken part. While vertical pumps work for long time, slide bearings under liquid needs to be changed. Or centrifugal force of shaft becomes larger and larger, which leads to mechanical accidents easily.

4.Installation Method

Vertical pumps are connected as one, so it is much easier to be installed. While horizontal pumps need to be adjusted accurately after installation.

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Vertical pumps can be divided into vertical multistage centrifugal pumps and vertical single stage centrifugal pump. Multistage pumps are used for low flow rate and high head situations such as constructive water supply system. Compared with horizontal one, vertical multistage pump is space saved, it can be installed straightly into tube, but when power is more than 75 kw, the pushing force may bring disaster effect to pumps. In such high power situation, we suggest horizontal pumps to be used.

Each pumps have its special applications and installation method, when they are used in suitable situation, their performance can be on the best condition. Many people do not know how to choose the most suitable pumps, so we will give you some professional advice on choosing.

1.Estimate head of pump and length of lifting pipe.

The water pump head should be in accordance with actual need. If lower than required, flow rate will be dropped and axial force is added, then pump is easily worn. If actual head is higher than required head, efficiency of pump is narrowed, and added flow rate as well as current will burn the motor down.
Then customers should make clear the dynamic and static water level of well, length of pumps pipe can be figured as follow:
H1+H2=H
(H1: vertical distance between dynamic water level and well
H2: loss of pipe line.)

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2.Distribution cable

Distribution cable of pump must be in accordance with submerged motor on specifications and length. If cable is broken or get high temperature in using process, customers should immediately get it checked. Wrong cable will narrow down the service life of cable and motor line package, or even burn the motor down.

After buying submersible pumps, you may always get puzzle on how to install well pumps by yourself, here APK will give you some suggestions on well water pumps installation. Followings are some installation tools that you may use in the process:

1. A sling chain that more than 2t
2. A Tripod whose vertical height should be no less than 4m
3. Two wire ropes which bear weight of 1t.
4. Two installation clamps
5. Wrench, hammer, bolt driver and electricity instruments, etc.

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When you get all these things ready, you should know the head of your pumps. Different head range of pumps decide different installation methods.

1. If head of your pump is lower than 30m, then you can use flexible pipe directly, and then use wire rope or hemp rope that can bear weight of whole pumps together with all the water pipes to hang pumps up and install them in well.
2. If your pump head is more than 30m (Steel pipe should be used), then the order should be：

First, use a clamp to clip in upper part of water pump(motor and pumps should be linked already), hang it up with chain and slowly put it into well, till the clamp is put on well entry, untie the sling chain.
Secondly, use the other clamp to clip in a tube, hang it up when it keeps 15cm far away from flange and then slowly put it down, rubber pad should be put between tube flange and pump flange. Tighten pump and tube closely with bolt, nut and spring map.
Thirdly, hang pump slowly up and untie the clamp on upper part, tie cable on tube closely with plastic string and put it down into well, till clamp is put on well entry.
Finally, use the above method to tie all the water pipe into well. After cable is connected with control switch, access three phase power supply.