Metric Mechanical Seals: A Guide to Selection and Application

 Metric mechanical seals are a type of mechanical seal that is used in a variety of applications where high-pressure and/or high-temperature fluids are present. They are characterized by their use of metric-sized components, which makes them compatible with a wide range of equipment.

Types of Metric Mechanical Seals

There are two main types of metric mechanical seals:

Single-acting seals: These seals are designed to prevent fluid flow in one direction only. They are typically used in applications where the pressure differential between the two sides of the seal is relatively low.

Double-acting seals: These seals are designed to prevent fluid flow in both directions. They are typically used in applications where the pressure differential between the two sides of the seal is high.

Selection Criteria for Metric Mechanical Seals

There are a number of factors to consider when selecting a metric mechanical seal for a particular application. These factors include:

The type of fluid: The type of fluid that will be flowing through the seal will dictate the materials that the seal is made of. For example, seals that will be exposed to corrosive fluids will need to be made of materials that are resistant to corrosion.

The pressure differential: The pressure differential between the two sides of the seal will determine the size and strength of the seal that is needed.

The temperature range: The temperature range that the seal will be exposed to will determine the materials that the seal is made of and the type of lubricant that is used.

The vibration level: The vibration level of the equipment that the seal is installed on will need to be taken into account when selecting a seal. Vibration can cause seals to wear prematurely.

The cost: The cost of the seal is also an important factor to consider.

Applications for Metric Mechanical Seals

Metric mechanical seals are used in a wide range of applications, including:

Pumps: Mechanical seals are used in pumps to prevent fluid leakage and to improve efficiency.

Compressors: Mechanical seals are used in compressors to prevent fluid leakage and improve efficiency.

Valves: Mechanical seals are used in valves to prevent fluid leakage and to improve performance.

Heat exchangers: Mechanical seals are used in heat exchangers to prevent fluid leakage and to improve efficiency.

Other rotating equipment: Mechanical seals are used in a variety of other rotating equipment, such as turbines, generators, and mixers.

Maintenance of Metric Mechanical Seals

Metric mechanical seals require regular maintenance to ensure that they continue to function properly. This maintenance typically includes:

Inspection: The seal should be inspected regularly for signs of wear, damage, or contamination.

Cleaning: The seal should be cleaned regularly to remove any dirt, debris, or contaminants that may have accumulated.

Lubrication: The seal should be lubricated regularly to prevent it from drying out and to improve its performance.

Replacement: The seal should be replaced if it is worn, damaged, or contaminated beyond repair.