Consider 5 Key Points for Mechanical Seal Selection

 What is a Mechanical Seal? 

Mechanical seals are used throughout all industrial processes.  A mechanical seal is a device used on a rotating shaft to keep fluids in and contaminants out. These seals are located in the asset’s stuffing box or seal chamber. This is the area of the pump where the pump shaft connects to the drive. 

Most of the mechanical seals consist of two flat faces that are installed perpendicular to the shaft, one of the faces is mounted stationary to the seal chamber housing and the other face rotates with the shaft to provide the primary seal. This contact of seals prevents leakage and retains the fluid within the pump. They can operate for a long term without any issues, as long as they've been selected for accurate application. Below we define the operating conditions of what material characteristics to be considered for preventing improper material selection.

1.LIQUID

Identifying the exact liquid that is being processed is the first step for selecting. The seal material must be able to withstand the fluid being processed. All seal materials must be chemically compatible with the fluid, or there would be an increased risk of seal failure. 

2.PRESSURE

The seal size and the pressure in the seal chamber determine the type of seal required. 

3.TEMPERATURE 

Seal materials must be selected to handle the liquid’s temperature. It is important because different seal materials are measured for certain temperatures and you should not exceed the limit of these materials. 

4.LIQUID CHARACTERISTICS

Knowing the viscosity of the liquid is important to ensure seal life. Abrasive liquids create excessive wear and will ultimately shorten the seal's life. The use of an external flush plan & double seals give operator's the option to use mechanical seals on these difficult fluids.

5.RELIABILITY & EMISSION CONCERNS

Every company has their own standards and operating procedures when it comes to reliability and emission for an application. The seal type must meet the desired standards for the pump application. Since environmental safety is an integral part of manufacturing companies, double seals are at the peak of choice. 

After understanding the seal's operating conditions, you can easily choose the seal of your industry type. Also, consider the following characteristics of the material while selecting the construction material,

1.Temperature constraints

2.Chemical resistance properties

3.Flexibility 

4.Wear resistance

5.Thermal expansion and conductivity properties

When selected correctly, all types of mechanical seals will thrive. Knowing the mechanical seal types and the parts that make them operate is the starting point. Assessing the application, installation, and operation (with leakage limits) helps determine which seal type should be selected and how well it will perform in the system. If you are new to mechanical seals and are considering choosing for your industry, then know more from experts. 


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