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Improving equipment reliability in vessel stripping pumps


On large cargo vessels, stripping pumps are used to evacuate ballast and other tanks on board. Typically sealed with compression packing, the pumps lose prime once emptied. It is difficult to prime after the tank has been evacuated because packing leaks into the atmosphere so that it can be properly lubricated and cooled.

When the pumps were started after evacuation, the packing would run dry, causing it to excessively heat up and wear.

Operators would have to intervene to regain prime so they could operate. They wanted to find a better sealing solution.

The Chesterton 442 Split Seal can be installed without dismantling the pump.


Chesterton 442 Split Mechanical Seal with Plan 11 Discharge Recirculation

The Chesterton 442 Split Seal is an excellent option for sealing stripping pumps or other pumps that tend to run dry. Because the 442 Seal is a split design, you do not have to dismantle the pump to install the mechanical seal!

Another advantage: the patented 442 design allows the split faces to handle positive pressure and vacuum, which is critical in this application.

The 442 Split Seals utilizes a carbon seal face with high graphite content which allows for momentary dry-run conditions. Once the pump is primed, lubrication is provided to the seal faces via the existing discharge re-circ line.


  • The pumps now immediately prime at every
    startup because the Chesterton 442 Split Seal
    is capable of sealing vacuum.
  • Operators no longer need to spend valuable
    time trying to get the pump to prime
  • Chesterton 442 Split Seal technology has
    proven to be effective and reliable in sealing
    stripping pump applications

Chesterton 442 with Plan 11 Discharge Recirculation

About us

Chesterton® is a world leader in helping process industry companies and manufacturers improve the reliability and efficiency of their rotating, stationary, and fluid power equipment platforms. We are known across a wide range of industries for our award-winning pump and valve sealing solutions, applications expertise, equipment maintenance and wear-prevention products, and knowledgeable hands-on local service. Chesterton product range includes mechanical seals, packing and gaskets, industrial lubricants and coatings.

® Registered trademark owned by A.W. Chesterton Company

EN23737.  Issued 01/2015.

Technical data reflects results of laboratory tests and is intended to indicate general characteristics only. A.W. Chesterton Company disclaims all warranties expressed or implied, including warranties of merchantability and fitness for a particular purpose. Liability, if any, is limited to product replacement only. Any images contained herein are for general illustrative or aesthetic purposes only and are not intended to convey any instructional, safety, handling, or usage information or advice respecting any product or equipment. Please refer to relevant Safety Data Sheets, Product Data Sheets, and/or Product Labels for safe use, storage, handling, and disposal of products, or consult with your local Chesterton sales representative.

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