Reasons for mechanical seal leakage of slag oil pump and arrangement of slag oil

The main reasons for the mechanical seal leakage of the slag oil pump are as follows:

1. The spring of the mechanical seal is damaged or stuck, and the compression is not flexible.

2. The compression ratio of the dynamic and static rings of the mechanical seal is not appropriate.

3. The dynamic or static ring of the mechanical seal is broken.

4. The conveyed medium contains impurities that cause wear on the sealing surface of the mechanical seal.

5. When transporting corrosive media, replace the O-ring with the sealed one, otherwise it will cause leakage of the slag oil pump.

6. The surface accuracy of the main and sealed positions of the shaft is insufficient or not processed to the zero line standard, which prevents the sealing contact between the O-ring of the machine seal and the shaft wall, resulting in leakage of the slag oil pump and gear oil pump.

7. The machining size of the static ring sealing cover is slightly larger than the outer diameter of the machine seal static ring, causing mechanical seal leakage.

8. Under the operating conditions, the pressure is too high, causing leakage of the pump seal.

9. When transporting solvents such as phenol, the O-ring of the mechanical seal cannot be made of rubber material, otherwise it will cause seal leakage.

10. The assembly of the dynamic and static rings of the mechanical seal is not concentric, resulting in leakage of the slag oil pump.

Several methods to increase the cavitation allowance of slag oil pumps and gear oil pumps:

1. Increase the pressure of the liquid level in the storage tank before the slag oil pump to increase the cavitation allowance.

2. Change the suction device to a backflow device, so that the medium conveyed by the slag oil pump can flow automatically to the pump inlet.

3. Reduce the flow loss on the pipeline before the slag oil pump. Try to shorten the pipeline as much as possible within the required range, reduce the flow rate in the pipeline, minimize bends and valves, and increase the valve opening as much as possible.

4. Reduce the installation height of the slag oil pump in the suction device.

The above measures can be comprehensively analyzed and appropriately applied based on the selection, material selection, and on-site conditions of the slag oil pump.

Selection criteria for slag oil pump:

1. The gear to be selected for conveying media containing solid particles.

2. The selection of slag oil pump should meet the characteristics of the conveying medium. Choose which slag oil pump to use according to the characteristics of the medium. For lubricating oil and engine oil, choose a regular slag oil pump. For heat transfer oil or those with good oil temperature, choose a heat transfer oil pump. We will not list them one by one here.

3. If transporting flammable and explosive media, selective slag oil pumps such as copper wheel pumps and motors should be selected.

4. It is recommended to use a magnetic drive pump for conveying poor or valuable media that are afraid of leakage.

5. Choose corrosive materials for the parts where corrosive media flow during transportation.

6. Check whether the parameters of the selected slag oil pump meet the pressure, head, temperature, suction, and other requirements of the conveyed medium.

What is the layout of the slag oil pump? The following is a specific interpretation of the content:

1、 Layout of slag oil pump:

(1) Outdoor layout generally concentrates the slag oil pump under or on the side of the pipe gallery, and can also be arranged near miscellaneous suction equipment. The main advantages are ventilation, easy operation and maintenance. If the slag oil pump is arranged under the miscellaneous pipe gallery, the centerline of the slag oil pump inlet and outlet should be aligned, 0.6m away from the centerline of the pipe gallery column.

(2) The semi outdoor arrangement of slag oil pumps is suitable for rainy areas. Generally, slag oil pumps are arranged below the pipe gallery and a ceiling is installed above the pipeline. Alternatively, the slag oil pump can be arranged on the lower floor of the frame, with the frame platform serving as the ceiling. According to the layout requirements of the slag oil pump, arrange the slag oil pump in single row, double row or multiple rows.

(3) The slag oil pump installed indoors is suitable for cold or windy areas, as well as occasions with special process requirements.

2、 Layout requirements for slag oil pump:

(1) For slag oil pumps arranged outdoors or semi outdoors, they are generally perpendicular to the axis of the prime mover and the axis of the pipe gallery.

(2) For the slag oil pump installed indoors, when the temperature of the conveyed liquid is higher than the natural point or the conveyed liquid is liquid hydrocarbons, it should be arranged separately from other slag oil pumps in separate rooms and separated by fire-resistant walls.

The slag oil pump is driven by a vertical motor, which can effectively block upstream pressure and flow fluctuations. The pressure pulsation at the inlet and outlet of the slag oil pump can be controlled within 1%. By using a slag oil pump on the extrusion line, the flow output speed can be increased, the shear and residence time of materials in the extruder can be reduced, and the extrusion temperature and pressure pulsation can be lowered to improve the rate and product quality.

The slag oil pump is a pair of meshing gears and pump cylinders that separate the suction and discharge chambers. The role and performance that slag oil pumps can produce in different aspects, and the contribution they demonstrate in practical aspects, can penetrate into different areas. When the gears rotate, the volume between the teeth on the suction chamber side gradually increases, the pressure decreases, and the liquid enters the teeth under the pressure difference. As the gears rotate, the liquid between each tooth is carried to the discharge chamber. At this point, the volume between the teeth at the meshing point of the discharge chamber gradually decreases, and the liquid is discharged.