Single Stage End Suction Centrifugal Pump Handling And Troubleshooting

Single stage end suction centrifugal pump is a common centrifugal pump. Due to its simple structure and reliable performance, it is widely used in urban water supply, farmland irrigation, industrial circulating water and other water supply systems, fire protection systems, HVAC systems, industrial water treatment, etc.; or special materials can be used for sewage treatment and chemical systems.

Installation requirements and steps

• The single stage end suction centrifugal pump shaft needs to be installed horizontally to ensure stability.
• Avoid installation in a high-load vibration environment.
• Before assembling the pump, check whether there are any defects that affect the assembly of each part, and wipe it clean before putting it into assembly.
• Tighten the fasteners, plugs, etc. for connection in advance on the corresponding parts.
• Place or install the sealing rings, gaskets, etc. on the corresponding parts in advance.
• Install the sealing rings, packing, packing rings, packing glands, etc. on the pump cover parts in sequence in advance.
• Install the bearing on the shaft, and then install it in the suspension, close the bearing positioning plate and the hole retaining ring, and put the water retaining ring on the impeller end of the shaft.
• Install the shaft sleeve on the shaft, and then install the pump cover on the suspension, install the impeller flat key, impeller, spring washer, cap nut in sequence, and tighten them.
• Finally, assemble the above components with the pump body, and tighten the fasteners connecting the pump body and the pump cover.
• (During the above assembly process, small parts such as impeller keys, water retaining rings, and sealing rings are easy to be missed or installed in the wrong order, so special attention should be paid. The single stage end suction centrifugal pump is basically disassembled in the reverse order of the assembly sequence)

Pre-start inspection

• Make sure the single stage end suction centrifugal pump is full of liquid to avoid idling.
• Check whether the couplings of the motor and pump are aligned.

Operation and maintenance

• Regularly check the bearing lubrication.
• Keep the pump housing and pipeline clean to avoid blockage.

Start:

• Before connecting the single stage end suction centrifugal pump, make sure the motor's rotation direction is correct and the pump's rotation is flexible.
• Close the valve gate of the protruding cone pipe.
• Fill the pump with water, or use a vacuum pump to draw water.
• Turn on the power supply. When the pump reaches the normal speed, gradually open the gate valve on the leaf outlet pipeline and adjust it to the required operating point. When the gate valve on the leaf outlet pipe is closed, the pump cannot work continuously for more than 3 minutes.

Stop

• Gradually close the gate valve on the pipeline and cut off the power supply.
• If the ambient temperature is below 0 ℃, the water in the pump should be released to avoid freezing and cracking.
• If it is stopped for a long time, the pump should be disassembled and oiled, packed and stored.

Operation

• During the start-up and operation process, it is necessary to pay attention to the instrument readings, bearing heating, packing leakage and heating, pump vibration and noise, etc., and if any abnormality is found, it should be handled in time.
• The bearing temperature rise shall not exceed 40 ℃ above the environment, and the maximum bearing temperature shall not exceed 80 ℃.
• If the packing is normal, the leakage should be small, about 60 drops per minute.
• If the gap between the sealing ring and the impeller matching parts is worn too much, a new sealing ring should be replaced.

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