What is a double mechanical seal? - LEAK-PACKL

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Here you know more about double mechanical seal. A double mechanical seal has two primary seals with a barrier or buffer fluid area in between. This article explain about working of mechnisum double mechnical seals.

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Presentation Transcript

Slide 1:

WHAT IS A DOUBLE MECHANICAL SEAL?

Slide 2:

Double Mechanical Seal

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BRIEF DESCRIPTION ABOUT DOUBLE MECHANICAL SEAL  Amongst the  several types of mechanical seals , double seals are preferred for maximum sealing safety. The seals reduce the possibility of leakage of gas or fluid being handled in mixers or pumps to almost zero . Hence, in the applications that need zero emission compliance or  100% safety  guarantee, the  double seals  are the best choice . When properly installed and maintained, they offer a complete service guarantee.

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Since the double seals give the total control over the fluid film over the seal faces and the operating environment, they serve for quite a long time as compared to the single seals . THE WORKING MECHANISM OF A DOUBLE MECHANICAL SEAL The  double seal  uses a couple of primary seals and a buffer fluid area or barrier in between the two layers. Each primary seal has two parts; a soft and narrow stationary face and a hard and wide rotating face . The soft seal shows wear and tear whereas the hard part maintains the integrity of the seal when it is operational.

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APPLICATIONS THAT USE DOUBLE SEALS To stop a pollutant or hazardous material reaching the surroundings To prevent leakage of some precious process fluid product To extend the life of the seal by controlling the type of fluid film on the faces of the seal To keep the mechanical seal secure from the atmospheric conditions To avoid contamination of the process media even if one seal fails

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In the situation of inboard seal failure or scheduled equipment repair, double seal acts backup seal In the applications where no reliable and stable lubrication of the seal face is offered by the process fluid, it works as an alternative. The examples are non-settling slurries, viscous fluids or gaseous media To extend the life of the seal; it is essential to control the fluid film that gets into the contact of the seal face. By this, ideal pressure, temperature and lubrication are achieved . When the  double seal is installed , it must contain the environmental support and control system. It is nothing but a buffer or barrier fluid. It is stored in a separate tank and supplied to the seal faces. It keeps the faces cool and lubricated .

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The level of the fluid and pressure is crucial for the safety of the system and the environment. It can  manage  the  operating temperature , lubrication and isolate the seal from external conditions . Double seals are used in various situations when safety is the prime concern . Also Read :  How does a mechanical seal works ? What is a Mechanical Seal in a Pump ? What is the difference between Mechanical Seal and Gland Packing?

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