How to Choose the Most Suitable Mechanical Seal

Proper selection of mechanical seals based on their application can help in keeping them operable for long periods without facing any issues. According to a majority of mechanical seal manufacturer in India, the operating environment or application data must be studied accurately before selecting the type of seals and the material for construction to make sure of the best performance from the seal and extend its lifetime. Below are the different operating conditions and material characteristics that should be considered to avoid improper material selection for a mechanical seal.

Liquid

The first step in the selection process is identifying the liquid that will be handled by the seal. The material of the mechanical seal should be able to withstand the fluid that is being processed through it. Chemical incompatibility with the fluid can increase the risk of seal failure.

Pressure

The type of seal required is dependent on the pressure value in the seal chamber and dimensions of the seal.

Characteristics of the Liquid

In order to choose the right mechanical seal, it is essential to know the viscosity of the liquid that the seal will hold. Abrasive fluids can cause extreme wear and tear and will shorten the life span of the seal. Teflon bellow mechanical seal or use of double seal gives operatives the option to use mechanical seals on these abrasive liquids.

The temperature of the liquid

Mechanical Seals must be selected to suitably handle the liquid’s temperature. Various seal materials are rated differently for specific temperatures. Therefore, it becomes vital to not use a particular mechanical seal with a liquid which has the temperature that exceeds the limit for the particular seal material.

Emission and reliability specification

Every company has established its own preset standards and operating procedures for emission and reliability for an application. The chosen seal type and arrangements should meet the emission standards and desired reliability for the application.

Other characteristics that should be considered before choosing the material and type of mechanical seal are:

•    Flexibility

•    Wear resistance

•    Temperature constraints (Environmental)

•    Chemical resistance

•    Thermal expansion and conductivity

•    Low leakage and friction

•    Wear resistance

•    Corrosion resistance

•    Good thermal properties