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What Are The Reasons For The Failure Of Mechanical Seals?
Mar 27, 2018

What are the reasons for the failure of mechanical seals?

The mechanical seal leaked within less than half a year. The level of the lubricating oil tank rose. After removal, it was found that Quanyi pump mechanical seal stationary ring anti-return pin blocked, the compensation seat assisted sealing ring wear, from the static ring The failure of the mechanical seal due to the truncation of the transfer.

After analysis, it was found that the nitrogen in the front of the original mechanical seal caused a mechanical seal failure due to unstable pressure (after pressure increase), resulting in a rise in the level of the lubricating oil tank. The main reasons are the following two aspects:

1. The original mechanical seal stationary ring anti-rotation pin blockage is caused by the uneven composition during machining and the larger shear force at the start of the compressor;

2. The amount of interference of the static ring O-ring of the original mechanical seal is large.

The mechanical seal plan adopts stop-type planning, the compensation ring uses graphite rings, the pump uses separate mechanical seals and non-indemnifying rings use metal spraying ceramics, and compensation ring seals use O-rings.

The following are the primary parameters of mechanical seals. Load factor K: The ratio of the effective area Ae of sealing fluid pressure acting on the compensation ring to the area Ae of the non-compensation ring tending to close, and the area of the sealing ring area A. The formula is K=Ae/A. The magnitude of the load factor is related to the degree to which the pressure of the medium acts on the sealing end face. Face pressure Pc: The force applied to the unit area of the sealing face. The face pressure of the double-end mechanical seal is Pc=Ps+Pf(K-λ)±Pt. In the formula, Ps is the spring pressure; Pf is the sealing pressure; Pt is the pressure that causes the end face to increase or decrease due to friction.


Susie Ding


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