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The mechanical seal is used in a pump, mixer and other mechanical engineering scenarios to contain the fluid within a vessel where a shaft rotates through a stationary (or rotating) housing.

Why is mechanical seal important in this situation? It is because the rotating shaft has to move in a wet environment, but there should not be the leakage of pressurized fluid. Hence, the role of a seal is quite critical.

Does it mean the seal stops the leakage completely? Well, on the practical grounds yes because there is no ‘visible leakage’.

There is a little leakage as the fluid vapors get released into the atmosphere from the faces of the seal, though. Since the quantity is hardly quantifiable, the seals are considered leak proof.

The seals do not damage pump sleeve or shaft.

Due to inboard springs that get adjusted as the seal faces wear, it is not required to do daily maintenance.

Mechanical seals cause less power consumption than gland packing because of the lightly loaded faces.

In mechanical seals, the lubricant doesn’t get washed out. Therefore, bearing contamination gets avoided in normal operational conditions.

Plant equipment remains corrosion free.

Relatively less maintenance and cleaning are required. It makes mechanical seals cost-effective.

Oil seals prevent accumulation of dirt in the machine.

Oil seals close off the space between stationary and moving components in the mechanical equipment. It saves the lubricant from escaping through the equipment and ensures smooth operation of the machine.

Oil seals are called rotary shaft seal or radial lip also.

Oil seals prevent seeping of potentially hazardous contaminants like dirt or fluid in the running machine

These seals safeguard mixing of two things like oil and water

In the high-intensity work environment, oil seals play a vital role

Oil seals are long-lasting and sturdy

Oil seals can work relentlessly if the preventive and corrective maintenance is in place