Classification of Mechanical Seals by Arrangement - LEAK-PACK

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LEAK-PACK

• Leak-Pack Engineering (I) Pvt Ltd" is engaged in
  the design, manufacture and installation of
  Mechanical Shaft Seals for corrosive, volatile,
  abrasive, precious, flammable fluids on Pumps,
  Agitator, Blenders, Reactors, Blowers,
  compressors, mixers, steam turbines and other
  rotary-motion equipment.

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CLASSIFICATION OF MECHANICAL SEALS BY ARRANGEMENT
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CLASSIFICATION OF MECHANICAL SEALS

• The utility of mechanical is multifaceted. Not
  just it acts as a check valve, but also as a
  slider bearing.
• Thus, it prevents liquid under pressure from
  leaking out of the pump or drawing air into the
  pump in vacuum conditions.
• Mechanical seals when improperly installed can
  fail frequently.
• They can be classified into several categories.
  Here, we will study the classification of
  mechanical seals by arrangement.

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TYPES OF MECHANICAL SEAL ARRANGEMENT
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2
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Arrangement 1
Arrangement 2
Arrangement 3
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Arrangement 1

• It can be defined as one mechanical seal in a
  seal chamber.
• Therefore, it is also known as a single seal.
• You have one set of seal faces.
• The seal is exposed to fluid in the pump as well
  as the seal chamber.
• The main goal of a mechanical seal is to control
  the amount of process fluid in the seal chamber
  from reaching the atmospheric ide in the seal.
• Arrangement 1 is one of the most commonly used
  arrangements in industrial applications because
  it is cost-effective and easy to use.
• You need a simple piping plan to apply it.
• You do not have any operator to monitor it.
• Arrangement 1 is small in size, and it can fit
  any centrifugal pump design.

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Arrangement 2

• In this arrangement, two seals are arranged in
  series.
• The purpose of the inner seal is to seal the
  fluid in the chamber.
• If any leakage happens, it flows into a cavity
  between these two seals.
• The cavity between the two seals contains a
  buffer fluid.
• The buffer fluid is maintained at a lower
  pressure than seal chamber pressure.  acc
• The outer seal seals the buffer liquid and any
  accumulated process leakage under low-pressure
  conditions.
• The outer seal operates under full pressure and
  temperature in case the inner seal fails. Thus,
  total redundancy is guaranteed.

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Arrangement 3

• In this arrangement also two seals are used. But
  here, the barrier fluid between seals keeps a
  pressure higher than the seal chamber pressure.
• Here, both inner, as well as outer seal, will
  seal the barrier fluid.
• In this arrangement, the seal is less dependent
  on the properties of the process fluid in the
  process.
• The seals can operate when there is any liquid
  present in the seal chamber. There is no process
  leakage here because the barrier fluid is
  maintained at a higher pressure as compared to
  the seal chamber pressure.
• Barrier fluid will leak to the atmosphere across
  the outer seal. It will leak into the process
  across the inner seal.
• All these three arrangements have positive and
  negative aspects. One has to choose an
  arrangement that is fit for the process.

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