The main factors influencing the pumps with mechanical seal using effect such as type selection, installation, daily maintenance.

1. Selection
Reasonable lectotype is the premise of the normal operation of the pump.Mechanical seal type selection is based on the work when using medium pressure, temperature, diameter of axle, dielectric properties, installation environment, allows to choose the parameters such as leakage.In use process in the factory, can according to JB1472-75 to choose to use a variety of standard pumps with mechanical seal.
2. Installation
After reasonable select correctly the mechanical seals installation is to ensure that the mechanical seal an important part of the work.The installation process first of all should be emphasized:
(1) The installation process should always be kept clean, especially the rotating ring and static ring sealing surface and auxiliary seal surface should be without impurities, dirt and not allowed to use clean cloth to wipe the sealing surface.
Can be in of dynamic and static sealing ring of the friction surface coated with a small amount of machine oil, in case in empty pump test result in sealing surface damage.
(2) Are not allowed to use the iron tool hitting the seals, rotating parts should be carefully set on the axis, and several times to tighten the retaining bolt equably, finally to oppression swivel backwards with the hand, observe whether can swivel axial float.Need special attention is that between the ring and static ring positive pressure regulation to the advisable, with just can seal medium mechanical seal to prevent damage to occur in a short period of time.
(3) The installation of mechanical seal sealing face must have certain specific pressure (0.4 ~ 0.6 MPa), so as to achieve the purpose of sealing, on both ends of the close degree can be adjusted by the spring.In order to guarantee a certain pressure, the requirement of pump shaft axial momentum is 0.5 mm or less.
(4) The pump shaft around too much, will cause mechanical seal uneven force between two seal face, unable to form liquid membrane, sealing function loss.
(5) Due to the vibrations of the pump mechanical seal damage, so the appropriate damping measures to the pump.
3. Daily maintenance
(1) Before the start of mechanical seal to conduct a comprehensive inspection, and check the attached devices and pipeline is installed as required.
(2) Before the start of must carry on the static pressure test, general hydrostatic pressure is 0.2 ~ 0.3 MPa.Hydrostatic test, the sealed cavity filled with fluid, barring manually.
(3) The use of pump mechanical seal oil system should start the sealing oil system, parking finally stopped after sealing oil system.After pump start-up if there is a slight leakage phenomenon, should observe for a period of time.Such as leakage is still not reduced after 4 h of continuous running, would probably have to stop the pump to check.
(4) Daily Tours of inspection and record, need special attention is that: the operating pressure of the pump should be smooth, suggest ≯ 0.1 Mpa pressure fluctuations.
(5) Seal of inspection, when the leakage exceed standard, heavy oil ≯ 5 drops/min, light oil ≯ 10 drops/min, as observed in 2 days still no signs of improvement, you should stop the pump to check sealing device.
(6) Should be paid attention to do a good job in running lubrication, irrigation, cooling and other measures.