Explain Mechanical Seal Basics and Seal Selection Process

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EXPLAIN MECHANICAL SEAL BASICS AND SEAL SELECTION
PROCESS

• A Guide by Leak-Pack

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BASICS OF MECHANICAL SEAL
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Mechanical SEAL SELECTION PROCESS Info

• Mechanical seals play an important role in the
  pump. When the liquid is pumped, it enters the
  suction chamber inlet at the eye of the impeller.
• When impellers rotate at very high speed, the
  liquid is forced out centrifugally to the outside
  diameter of the impeller.
• It flows out from there through the discharge
  nozzle. The same discharge pressure flows down
  behind the impeller to the drive shaft connected
  to the driver.

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• When the mechanical process handles expensive
  fluids or corrosive fluids, leaks are not
  tolerated.
• This shaft has to be sealed efficiently. Here
  comes the role of the mechanical seal. It
  prevents the escape of the fluid.
• The clearance between the passageway through the
  wall of the housing or casing or pressure vessel
  and the rotating shaft is an important parameter.
• Mechanical seals stop the leakage.

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WHAT ARE THE THREE PRIMARY SEALING POINTS?

• In the mechanical process, three sealing points
  are essential.
• Leakage between the casing and the stationary
  element
• Leakage between the shaft and rotating element
• Leakage between rotating and seal elements, and
  the mating surface

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• The three basic components are
• A set of primary sealing element
• A set of secondary sealing element
• The hardware that attaches, positions and
  maintains face to face contact

Also Read Top 5 Things Mechanical Seal Users
Need to Know
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TYPES OF SEALING ELEMENTS

• Mechanical seals involve two types of sealing
  elements.
• Primary sealing element
• It is formed by two lapped faces or finely
  polished faces. In this sealing element, one face
  is stationary whereas the other face is fixed to
  a shaft that rotates with high speed.
• All seals have some leakage, but it is almost
  invisible and doesnt cause harm to the process.

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• 2. Secondary sealing element
• The leakage path around the stationary and
  rotating faces of the seal are managed by using
  the secondary sealing element. It is made from
  fluro-castomers.
• In case of pusher seals, they should move forward
  along the shaft so that the vibrations and wear
  at the seal face can be avoided.
• In case of non-pusher seals, the wear is taken
  internally, and the secondary seal remains
  entirely static.

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SEAL SELECTION PROCESS

• Which liquid is being handled by the seal? It
  decides the seal material. It should be able to
  withstand the fluid and should be chemically
  compatible.
• Seal type is decided based on the pressure in the
  seal chamber.
• The seal material should be chosen appropriately
  to handle the temperature of the liquid.
• The characteristics of the liquid, e.g.
  viscosity, abrasion decide the seal type.
• The seal arrangement and type should meet the
  emission and reliability standards.

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