We are undertaking mass production of API Plan72+76 seal support systems. The attached photos capture key stages during manufacturing,

showcasing our precision machining and strict quality control for every component of the skid assembly.
 
Working Principle
 
Plan72 (Buffer Gas System)
 
Clean and dry nitrogen is supplied externally and injected into the cavity between the primary seal and secondary seal at a pressure slightly lower than the internal process pressure.
 
The buffer nitrogen continuously purges, isolates and dilutes trace leaked process gas, keeping the internal seal chamber clean and stable,

and effectively protecting the tandem dry gas seal during long-term operation.
 
Plan76 (Leakage Venting & Monitoring System)
 
Plan76 collects mixed gas of leaked process medium and buffer nitrogen from the seal assembly. The mixed gas is safely transported to flare systems, incinerators or gas recovery pipelines.
 
The system realizes real-time pressure monitoring and automatic alarm for seal leakage, ensuring safe, environmentally friendly and controllable equipment operation.
 
Key Features
 
- Adopts standard tandem dual dry gas seal structure; the secondary seal serves as reliable backup protection if the primary seal fails.

- Applicable to volatile, flammable, toxic and hazardous gaseous media.

- Low and zero-emission design, fully compliant with industrial environmental protection and VOCs emission regulations.

- Stable operating performance, prolonged seal service life and greatly reduced daily maintenance costs.

- Equipped with integrated pressure monitoring, leakage detection and remote alarm functions.
 
Typical Applications
 
- Light hydrocarbon pumps, LPG pumps, ethylene and propylene pumps

- Refining equipment for gasoline, naphtha and aromatic media

Chemical process pumps conveying flammable, volatile and toxic gas media
 
If you need detailed technical parameters, customized solutions or official quotations for the API Plan72+76 seal support skid, please contact Dandong Runhe Seal professional team.

We provide accurate one-on-one technical support and reliable sealing system solutions for global industrial users.

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