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Expert Analysis: The Normal Operation And Failure Reason Of Mechanical Seals
Mar 08, 2018

1, The preparatory work and precautions for mechanical seals

A. Comprehensive inspection of mechanical seals, as well as ancillary equipment and pipeline installation is complete, whether meet the technical requirements.

B. Mechanical seals before the start of the static pressure test to check whether the mechanical seals leakage phenomenon. If leakage is more, should find out the reason to try to eliminate. If it is still not valid, you should remove the check and reinstall it. General hydrostatic test pressure is 2-3 kg/cm.

C. Press the pump to the disc to check whether it is brisk and even. If the car is struggling or not moving, you should check the assembly size is wrong, installation is reasonable.

2. Installation and outage of mechanical seals

A. Keep the sealed cavity filled with liquid before starting. For the transport of solidified media, the use of steam to heat the sealing chamber to melt the medium. The car must be parked before starting to prevent the soft ring from breaking up suddenly.

B. For the use of the pump oil seal system of mechanical seals, should start the oil seal system. Stop the oil seal system at the end of the stop.

C. Hot oil pump After the shutdown can not immediately stop sealing the oil cavity and end of the cooling water, should be sealed at the end of the oil temperature down to 80 degrees below, can stop cooling water to avoid damage to seal parts.

3, Mechanical seals operation

A. If there is a slight leakage after the pump starts, it should be observed for some time. If the continuous operation of 4 hours, leakage is still not reduced, you should stop pump inspection.

B. Pump operating pressure should be smooth, pressure fluctuation is not less than 1 kg/square centimeter.

C. Pump in operation, should avoid the occurrence of the phenomenon, so as to avoid the sealing surface of dry friction and seal damage.

4, Analysis mechanical seals typical failure reason

Mechanical seal itself problem

A. The inlay is not in place or uneven.

B. The load coefficient is too large or the design of the end-face pressure is unreasonable.

C. Improper material selection.

D. Uneven sealing surface.

E. The sealing surface is too wide or too narrow.

2 Auxiliary system problem

A. Working conditions are complex, but there are no ancillary facilities such as flushing.

B. Flushing pipe blockage.

C. Scaling of cooling pipe.

3 Media and Working conditions

A. Strong corrosive medium.

B. Solid particles in the medium.

C. Equipment to be evacuated.

D. Sealing surface crystallization.

E. Media viscosity is too large.

4 Pump problem

A. The shaft's machining accuracy is poor, string axis, beating, installation clearance is too large.

B. The vibration is too large after the pump is opened.

C. Poor gland gasket ring.

D. The seal box is uneven.

E. Mechanical seals have not been installed to the required amount of compression.


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