HOW TO MEASURE MECHANICAL SEAL?

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How To Measure Mechanical Seal?

• A Guide By Leak-Pack

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HOW TO MEASURE MECHANICAL SEAL?
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• Measurement of a mechanical seal is a systematic
  process. Sometimes, it is impossible to
  cross-reference a seal. What should be done to
  assure that the right seal is received for the
  pump?
• Experts say that it is vital to supply the
  information as accurately as possible. The two
  major rotating components of a seal are the
  spring and seal head.
• The seal head should be removed from the spring
  to measure it accurately. The inside diameter
  needs to be measured on the back side of the seal
  head. It is the end that fits towards the spring.

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• Thus, you will arrive at the seal size
  diameter. Remember, it is either the sleeve size
  where the seal fits over or the shaft size.
• In the majority of the seals, the front side has
  a black carbon face which runs against the
  stationary portion (known as the seat) of the
  mechanical seal assembly.
• Now you need to measure the spring length while
  it separates from the head of the seal. The next
  step is to measure the outside diameter and
  thickness of the seat or stationary.

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WHAT IS NEXT AFTER FINDING THE SIZE OF THE SEAL?

• The elastomer or rubber part of the seal is made
  from Nitrile (Buna-N or NBR). The exception is a
  process where the liquid is either some harsh
  chemical or high-temperature liquid.
• The seat or stationary of the seal is made from
  which metal? Is it some white and hard material?
  Or is it made from metal?
• What is the shape of the seat and stationary
  parts in the mechanical seal you are measuring?
  Does it contain an O-ring? Or does it have a
  rubber piece which fits into the seal like a cup?
  They are called cup mount type and O-ring mount
  type.

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• Other than finding out the sizing of the seal,
  now it is time to know about the material the
  seal is made from. You are supposed to get the
  following information as well
• Is the rotating seal face made from carbon? If it
  is black, then it is most likely carbon.
• Once you have all the information mentioned
  above, you will be assured of getting the perfect
  seal assembly. It will fit right and function
  correctly.
• If it is possible, you can send the entire seal
  assembly so that the seal supplier can measure it
  and send the right replacement. However, it can
  happen if you have a spare seal to run the
  operations well.

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