With increasingly stringent environmental regulations, the requirements for safety and reliability in pump sealing systems are being pushed to a new level. For flammable, explosive, or highly hazardous media, a single seal is no longer sufficient.

The API 682 combination of PLAN72 + PLAN75 offers a compelling approach:
PLAN72 seal support system introduces nitrogen as a buffer gas, which reduces the differential pressure on the primary seal while safely routing any leakage gas to the flare.
PLAN75 seal auxiliary system provides a reliable collection and separation solution for non‑volatile leaked media.
Together, they form a complete safety loop of “buffer + monitor + recover”:

Buffer gas reduces seal stress and dilutes leakage.
Real‑time monitoring keeps track of seal performance.
Leaked media is collected centrally and discharged safely.

Under the pressures of both the “dual carbon” goals and workplace safety, sealing system design is evolving from passive protection to proactive management.
What’s your view? I’d love to hear your thoughts.

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