Gas Seal for Propylene Services

A.W. Chesterton
A.W. Chesterton 4400 Gas Seal

Gas Seal for Propylene Services


Propylene is a primary intermediate in the production of many plastic materials. It is a gas atmosphere and flammable and is a poor seal face lubricant. It is considered a volatile organic compound (VOC) and emissions are regulated by many governments.

This plant was using single seal with a steam quench to seal propylene. The quench kept the seal O-ring resilient during operation but added temperature to the single seal. This increased emissions and flashing resulted in reduced sealing performance.

The plant wanted to improve sealing reliability and eliminate any fugitive emissions.

A.W. Chesterton Dual 4400 Concentric Gas Seal (1)


The Chesterton 4400 Dual Concentric Gas Seal was installed in the propylene pump population.

  • Environmental Piping Plan 74 was installed to protect and control the gas supply to the seal
  • Plan 11 was also used to reduce the pressure in the stuffing box
  • The steam quench was eliminated because the Chesterton 4400 Gas Seal was fitted with FKM O-rings that maintained their resiliency without the need for added heat

A.W. Chesterton Dual 4400 Concentric Gas Seal


  • The operation was able to eliminate fugitive emissions using the Chesterton 4400 Dual Concentric Gas Seal
  • Sealing reliability was significantly improved
  • The plant was also able to eliminate steam quench requirements and increase sealing

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