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Machinery Seals Why Use Auxiliary Facilities?
Jun 16, 2017

In fluid machinery (such as pumps, compressors, stirrers and centrifuges, etc.), working conditions Pump Machinery Seals are the most demanding components to be Machinery Seals. Bear the axial force as a thrust bearing; derive the heat generated like a heat exchanger. In the high temperature, high pressure, corrosion and other parts of the static seal has been more difficult to require high-speed rotation, in a few millimeters wide sealed surface to achieve dynamic seal on the more difficult. In order to solve this thorny problem, the long-term practice of people, people found two ways: First, from the structure and materials to start the seal, so that the kettle with Machinery Seals to adapt to harsh working conditions. The cost of this approach is higher, however, it can not fundamentally solve the problem. Once the seal fails, the consequences are serious. Another way is to improve the working environment through ancillary facilities. At present, the actual work without any auxiliary facilities of the Machinery Seals is rare. Such as high-pressure series of Machinery Seals and high-temperature pump Machinery Seals and so must use the appropriate auxiliary facilities. Through the auxiliary facilities, some of the harsh working environment can be changed to a sealed acceptable, so that the effect of Machinery Seals greatly improved, the use of a wider range. Machinery Seals work generated by the friction heat, so that the sealing surface temperature rise, if not take the appropriate facilities, will have many adverse consequences.

1) the temperature of the seal between the end of the liquid film vaporization, wear and tear, so that the seal failure:

2) the temperature increases the dynamic and static ring to produce thermal deformation, leakage increases, wear worse;

3) the temperature also exacerbates the corrosion of the Machinery Seals of the medium;

4) the temperature of the auxiliary seal ring aging, deterioration and failure;

5) the temperature increases, impregnated synthetic resin graphite, due to resin carbonation and performance degradation, dip metal graphite ring, due to metal melting and leakage.

It can be seen that the temperature is not allowed to be the enemy of Machinery Seals. The purpose of the auxiliary facility is to reduce the undesirable temperature rise of such people, to maintain a good lubrication between the sealing end faces, to make the parts of the Machinery Seals well and to work normally; to ensure the pressure in the sealed chamber in the vaporizable medium Can not be vaporized; in the cryogenic pump seal can play the role of insulation and heating; for solid particles appear crystal and strong corrosive media seal, but also to keep the seal from damage. Therefore, some countries refer to the auxiliary system as a protection system. In 1983, Sinopec Corp. organized a pump seal survey of seven petrochemical enterprises. The shaft seal of centrifugal pumps and compressors introduced abroad was equipped with different auxiliary facilities according to different conditions. Practice has proved that the structure is reasonable, the material is good and ignoring the auxiliary facilities, resulting in difficult working conditions, leading to early failure of the seal. On the contrary, some of the structure and materials are not enough to meet the requirements of working conditions, the use of effective auxiliary facilities, the results prompted the seal to meet the requirements of the working conditions, smooth operation '.

Some Machinery Seals work temperature, pressure and speed are not too high, no auxiliary facilities can work. However, it is advantageous to use the auxiliary facilities from the viewpoint of the stability of the seal and the service life. Therefore, the auxiliary facilities should be considered as part of the Machinery Seals, depending on the working conditions, the use of different auxiliary facilities. Internationally used American Petroleum Institute standards (centrifugal pump APl610), which have made specific provisions. Proper and rational use of auxiliary facilities is of great significance not only to the stability of the seal but also to extend the service life; it must be given adequate for safe production and for reducing leakage, reducing maintenance work and reducing production costs Attention. Auxiliary facilities are known as sealed circulation protection systems, or simply referred to as sealing systems or protection systems.

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