Weiwang manufacturer: FB and AFB corrosion-resistant centrifugal pumps

Weiwang manufacturer: FB and AFB corrosion-resistant centrifugal pumps】Start, Run, and Stop:

1. Preparation before starting
Before starting, the pump and the site should be cleaned thoroughly.
⑵ Check whether the lubricating oil level in the bracket is appropriate (the oil level is about 2mm from the centerline of the oil level gauge) and whether the oil level gauge is intact.
Before connecting the coupling, check the direction of rotation of the prime mover and connect it to the coupling after aligning it with the pump's direction arrow *.
After installing the mechanical seal, the pump shaft can be easily rotated by hand without any rubbing, and the protective cover of the coupling should be installed properly.
When using the pump with suction, it should be filled or evacuated before starting; When using the pump in reverse flow, fill the pump with the conveyed liquid before starting, remove the empty space in the pump, and then close the gate valve of the discharge pipe.
Before starting, check if the foundation bolts are loose. Whether the gland is skewed, and the supply of lubricating oil and cooling water.
2. Start up
⑴ Close the inlet and outlet pressure (or vacuum) gauges and the outlet valve (if there is a bypass pipe, it should also be closed at this time). Start the motor (jog first to confirm that the pump direction is correct before starting the formal operation), then open the inlet and outlet pressure (or vacuum) gauges. When the pump reaches normal speed and the instrument indicates the corresponding pressure, slowly open the outlet valve and adjust it to the required working condition. When the discharge pipeline is closed, the continuous working time of the pump cannot exceed 3 minutes.
During the starting process, attention should be paid to the power reading of the prime mover and the vibration of the pump at all times. The vibration number should not exceed 0.06 millimeters, and the measuring part is the bearing seat.
⑶ Sealing condition: The mechanical seal should have no leakage or heating phenomenon, and the packing seal should be in a continuous dripping state.
3. Run
⑴ Regularly check the heating condition of the pump and motor (the temperature rise of the bearings should not exceed 75 ℃) and the oil supply condition of the oil level gauge. (Generally, after every 1500 hours of operation, all lubricating oil should be replaced.).
⑵ Do not use suction valves to regulate flow to avoid cavitation.
The pump should not operate continuously below 30% of the design flow rate. If continuous operation is necessary under this condition, a bypass pipe should be installed at the outlet to discharge excess flow.
⑷ Pay attention to whether there is any noise during the operation of the pump. If any abnormal state is found, it should be eliminated or stopped for inspection in a timely manner.
4、 停止
⑴ Slowly close the gate valve of the discharge pipeline (if the pump is used in reverse flow, also close the gate valve of the suction pipeline), and turn off the switches of various instruments.
⑵ Cut off the power supply.
If external drainage is used for sealing, the drainage valve should also be closed.
If the ambient temperature is below the freezing point of the liquid, the liquid in the pump should be drained to prevent freezing and cracking.
If parked for a long time without use, in addition to draining the corrosive liquid inside the pump, all components should be disassembled and cleaned, especially the sealing chamber. The pump should be disassembled, cleaned, and reinstalled. In addition to applying oil and rust prevention treatment and sealing the pump inlet and outlet, regular inspections should also be carried out.

【Weiwang manufacturer: FB and AFB corrosion-resistant centrifugal pumps】Precautions for using mechanical seals:

This model of pump can be equipped with different forms of mechanical seals according to different usage conditions, such as internal single end balanced and unbalanced types, double end balanced and non flat balanced types, external mechanical seals, etc. The usage method and precautions also vary depending on the selected sealing type. Below are only a few general precautions to be taken.
1. Due to the fact that mechanical seals are generally suitable for use in clean, non suspended particle media, newly installed pipeline systems and liquid storage tanks should be carefully flushed to prevent solid impurities from entering the mechanical seal end face and causing seal failure.
2. In media that are prone to crystallization, when using mechanical seals, attention should be paid to frequent flushing. Before restarting after parking, clean the crystals on the mechanical seal.
3. Disassembling mechanical seals should be done carefully, and it is not allowed to use hammers, irons, or other tools to strike, in order to avoid damaging the sealing surfaces of the dynamic and static rings.
4. If there is dirt that cannot be removed, try to remove the dirt, rinse it clean before disassembling to avoid damaging the sealing components.
5. Before installing mechanical seals, all sealing components should be checked for failure or damage, and if so, repaired or replaced.
6. The relative friction sealing surface between the moving ring and the stationary ring should be strictly inspected, and no minor scratches, bumps, or other defects are allowed. All other components, including the pump body, impeller, sealing chamber, etc., should be washed clean before assembly, especially the dynamic and static ring surfaces, which should be carefully wiped clean with a clean, soft cloth or cotton yarn, and then coated with a layer of clean grease or engine oil.
7. During assembly, attention should be paid to eliminating deviations. When tightening screws, they should be tightened evenly to avoid deviation and seal failure.
8. Correctly adjust the compression amount of the spring. After the pump is installed, when manually pulling the rotor, you should feel that the sealing spring has a certain compression amount and can rotate quickly and flexibly without feeling tight. If it feels too tight or cannot be moved, it should be loosened appropriately.
9. For mechanical seals with external flushing, the flushing fluid should be turned on before starting to fill the sealing chamber with sealing fluid. When parking, stop the pump first and then turn off the sealing flushing liquid.