What is a mechanical seal in the pump?

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What is a mechanical seal in the pump?
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Mechanical Seal an overview

• A mechanical seal plays an important role in the
  function and operation of a centrifugal pump.
  There is a spinning shaft accommodated by a pump
  where the gas or fluid is mechanically maintained
  at the wet end of the pump.
• In a mechanical seal, there is a rotary seal face
  with a driving mechanism. It rotates at the same
  speed as the pump shaft. The stationary part of
  the seal is retained with the help of a gland. In
  some models, there is an integral stuffing box
  cover.
• To keep the rotary face firmly positioned against
  the stationary face, a tension assembly is used.
  The seal contains contamination and prevents
  leakage when the pump is operational or not.

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• The other part that completes the seal assembly
  is the static sealing gasket or ring or
  elastomeric bellows. They are strategically
  located in the seal.
• Mechanical seals are leakage control devices,
  which are found on rotating equipment such as
  pumps and mixers to prevent the leakage of
  liquids and gases from escaping into the
  environment.
• Mechanical Seal in a Centrifugal Pump  The
  mechanical seal is used in a pump, mixer, and
  other mechanical engineering scenarios to contain
  the fluid within a vessel where a shaft rotates
  through a stationary (or rotating) housing.

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The working mechanism of a mechanical seal

• The two faces of the seal play the main role in
  its mechanism. As mentioned earlier, the two
  faces are rotating faces and stationary faces.
  These faces are lapped so flat that there is no
  chance of gas or liquid passing through them.
• Due to that, the shaft can spin freely, and the
  seal is maintained mechanically. The life of the
  seal depends on the seal material combination.
  For abrasive material, hard seal faces are used.
  For water or automotive application, carbon or
  ceramic seals are useful. Silicon carbide seals
  are long-lasting, and they are energy efficient.
• Double mechanical seals are normally used in
  critical applications.

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Prevention of leaking

• The path within a mechanical seal is blocked with
  the help of a gasket, o-ring, or wedge made of
  rubber, flexible graphite, or PTFE. Maintenance
  of the seal is a critical aspect.
• Single or multiple springs or metal bellows or
  compressed elastomers are used for maintaining
  the seal faces together. The design of the
  mechanical seal determines the load on its face.

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• Seals must be designed to cater to the evolving
  industry demand. The fundamental rotating face of
  the seal design is capable of adapting to a wide
  range of industrial applications. Standard
  mechanical seals can work in very
  high-temperature conditions and shaft rotation
  speeds. The choice of a secondary seal determines
  the chemical capabilities and temperature of the
  seal. The chemical and abrasive resistance of the
  seal is defined by the combination of material
  used in the stationary and rotating faces of the
  mechanical seal.
• Beston Seals is ISO certified company specializing
  in providing solutions to all types of leakages
  by manufacturing mechanical seals and sealing
  components as per customers drawings, samples,
  or requirements. We are one of the best rotary
  union and mechanical seal manufacturers in
  India based in Mumbai, Maharashtra. To know more
  about mechanical seals call on 91-9820007401 or
  email info_at_bestonseals.com.

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