Mechanical seals are key components in centrifugal pump systems. These devices maintain the integrity of the pump system by preventing fluid leakage and preventing the ingress of contaminants. Mechanical seal systems are used in a variety of seal designs to detect leaks, control the seal environment, and lubricate secondary seals. There are a variety of mechanical seal types to choose from depending on the pump type and process variables. Each seal variant has its own unique design and characteristics, making it suitable for a specific application.

Different types of mechanical seals for centrifugal pumps

Mechanical seal types vary in design, arrangement, and how they disperse hydraulic pressure acting on their surfaces. The most common seal types include:

• Balanced seal

• Unbalanced sealing

• Thruster seals

• Non-push seals

• Conventional seals

• Collective seal

• Balanced and unbalanced seals

A balanced mechanical seal is a system in which the forces acting on the sealing surface are balanced. Due to lower end loads, sealing surfaces are lubricated more evenly and seal life is longer.

Balanced mechanical seals are particularly suitable for higher operating pressures, typically above 200 PSIG. They are also a good choice when working with low lubricity and high volatility fluids.

Unbalanced mechanical seal types are often used as a more economical alternative to more complex balanced seals. An unbalanced seal may also exhibit less product leakage due to tighter control of the mask, but the result will be a shorter mean time between failures. Unbalanced seals are not recommended for high pressure or most hydrocarbon applications.

Push and non-push seals

Pusher seals utilize one or more springs to maintain the closing force of the seal. The spring can be located in the rotating or stationary element of the mechanical seal. Push rod seals can provide sealing at very high pressures, but have a disadvantage because the elastomer beneath the primary sealing surface is subject to wear during operation as that surface moves along the shaft/sleeve.

Non-push seals use metal or elastomeric bellows to maintain sealing closing force. These seals are ideal for dirty and high temperature applications. Bellows seals are limited to medium/low pressure applications. Both pushrod and non-pusher designs are available in balanced and unbalanced configurations.

Conventional mechanical seal

Traditional seals are generally lower cost and are often installed on general service equipment. These seals require a higher level of operator skill to perform maintenance because they are installed as separate components.

packaging seal

Packaged mechanical seals integrate all sealing elements into one assembly. This greatly reduces the possibility of assembly errors and the time required for replacement.

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