Installation steps and operational issues of mechanical seals for circular arc oil pumps

[1] Installation Steps for Mechanical Seals of Arc Gear Pumps

Mechanical seals are high-precision mechanical components with high installation requirements. The stationary ring is generally made of fragile materials such as graphite, and should be handled with care to prevent human damage. Maintaining cleanliness is also an important part of installation. To install a set of mechanical seals for arc gear pumps, it is necessary to control the accuracy of other components that match them according to the standards, handle each sealing point, adjust the compression of the spring and auxiliary sealing ring within the required range, and the installation workers need to undergo training and long-term practice to be foolproof.

1. Confirm that the product model and specifications are consistent with the equipment requirements

2. Check whether the surface machining accuracy of the rotating shaft and shaft sleeve meets the requirements, and ensure that the rotating shaft is installed on the bearing box and rotates freely without jamming, axial displacement, and radial runout meet the standards specified by the Ministry of Petrochemical Industry

3. Remove burrs from components such as the rotating shaft, shaft sleeve, sealing chamber, and pressure cover, and clean them thoroughly

4. Measure whether the installation parts and auxiliary sealing dimensions meet the requirements by referring to the installation drawings

5. Evenly apply oil to the contact area between the sealed circular arc gear oil pump shaft, chamber, pressure cover, etc. and the auxiliary sealing ring (note: lubricating oil is not allowed to be injected into ethylene propylene rubber or medium, vegetable oil or soapy water can be applied, and oil is not allowed to be applied to static rings without anti rotation pins in principle) for easy installation

6. Install the static ring and its O-ring in the static ring cover. During installation, be careful not to tilt the static ring and measure it while installing. The deviation should not exceed 0.05mm

7. By measuring and calculating the compression amount of the spring, fix the position of the moving ring seat on the shaft sleeve, install the moving ring and compress it towards the spring side. The moving ring can automatically rebound without any jamming phenomenon

8. Install the static ring and pressure cover together on the shaft, taking care not to collide with the shaft and taking protective measures to prevent damage to the static ring. Then, install the shaft sleeve and dynamic ring

9. Install the pump cover and impeller, and pay attention to the treatment of each sealing point

10. After fixing the pump cover and impeller, before fixing the static ring cover, manually push the compensating ring for axial compression. After loosening, the compensating ring can automatically rebound without any jamming phenomenon, and then lock the cover bolts evenly

[2] Problems arising from the equipment operation of petrochemical circular arc gear oil pumps

1. Problems in the investment management of circular arc gear oil pump equipment

Currently, there are two major limiting factors in the use of pump equipment in China's petrochemical industry.

One is the price of pump equipment, and the other is the supply and demand relationship. At present, there are problems with poor procurement quality and insufficient maintenance costs in the use of oil arc gear pumping equipment in China, which have led to a disconnect between the production of oil arc gear pumps and pumping equipment, affecting the production of oil arc gear pumps

2. Problems in the management of arc gear oil pump equipment

In the selection and maintenance cost estimation process of arc gear oil pump equipment, empirical estimation method is often used, lacking a complete and accurate equipment budget method.

. In addition, the depreciation method is often used in the operation and management of pump equipment. This not only leads to some pump equipment being able to maintain operation despite being fully depreciated. Although some aging pumping equipment has not been depreciated, its internal performance cannot meet the needs of production and construction, which not only reduces the efficiency of pumping equipment, but also causes many potential problems. This is a common issue in the depreciation calculation of pump equipment and a common loophole in pump equipment management

3. Narrow coverage of equipment management for circular gear oil pumps

Petroleum management is not only about managing pump equipment, but also about further understanding the manufacturing principles and maintenance techniques of pump equipment. With the implementation of pump equipment management, the performance of petroleum circular gear oil pump equipment can be improved.

In the current management of petrochemical machinery, pumps, and pumps in China, we must adhere to the principles of chemical and technical management, and promote the development of management work while promoting vertical development. At present, the quality management and personnel allocation of circular arc gear oil pumps in China are lagging behind, resulting in inconsistency between pump equipment and production processes