Why Mechanical Seal Leak?

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Why Mechanical Seal Leak?

• A Guide by Mechanical Seal

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How to Fix Mechanical Seal Leakage
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CAUSES OF MECHANICAL SEAL LEAKAGE

• You wont like the mechanical seal to leak ever,
  but it is not possible. All mechanical seals leak
  after some time due to wear and tear.
• You can prolong the occurrence of leakage by
  taking diligent care of the seals, but it is
  impossible to avoid itcompletely.
• As we know the mechanical seal has two
  components a stationary member called seat and
  a rotating member called head.
• The head is statically sealed to the pump shaft,
  and it rotates with it. The seat is statically
  sealed to a stationary cover.
• When the stationary and rotating parts are in
  near contact, the primary sealing takes place.

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HARD CONTACT CAN CAUSE LEAKAGE

• Hard contact of the seal faces means the rotation
  without lubrication builds up friction. That
  causes damage to the seal face.
• It is one cause of leakage. Hence, utmost care is
  required not to run the seal faces dry.
• Thankfully, the design of mechanical seals is
  such that a thin film of liquid always exists
  between the seal faces.
• When the seal operates flawlessly, the thin film
  leaks to the side where the pressure is low. It
  means outside the pump.

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• In a single type mechanical seal pump, the
  overflow liquid is handled by the pump. In double
  or tandem type pumps, a barrier fluid is placed
  between the seals.
• The barrier fluid is supplied in such a way that
  one of the seals is exposed to the barrier fluid
  only. The inner seal is exposed to the liquid
  that is being pumped.
• In some pumps, pressurized gas is used to prevent
  the leaking.

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LEAKAGE IN VOLATILE LIQUID PUMPS

• While pumping volatile liquids, the fluid
  friction increases when it traverses through the
  seal faces. Thus, the fluid vaporizes and doesnt
  show a visible leakage.
• However, if the liquid is not volatile, we can
  see an accumulation of leakage outside the pump.

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A few parameters that determine the amount of
leakage in the seal are

• Type of liquid to be sealed
• Sealing pressure
• Speed of rotation
• Size of mechanical seals
• Face loading
• Material and finishing of the seal
• Temperature
• Pressure
• The viscosity of the liquid

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• Some seals are designed for high face loads. Here
  the leakage is minimal, but the seal doesnt last
  long. In light face load, the seals last long,
  but there is a high probability of leakage.
• Hence, it is critically important to choose the
  right type of seal in the pump.

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• Leak-Pack is ISO 90012008 certified company and
  one of the best mechanical seals suppliers,
  manufacturers  and exporters in India, providing
  solutions to all types of leakages by
  manufacturing Mechanical Seals and Sealing
  Components as per customers drawings, samples or
  requirements. To know more about Mechanical Seal
  call on 91-(2739) 271592 or email at
  info_at_leakpack.com.
• Read More Articles
• What is a Mechanical Seal in a Pump?
• How many types of mechanical seals?

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Contact US
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https//www.mechanicalsealsindia.in/
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