API Plan 74
API Plan 74 is a pressurized gas barrier system designed for dual gas-lubricated mechanical seals.
It supplies a clean, dry, and pressurized gas (typically nitrogen) to the seal chamber, ensuring a positive pressure differential that prevents process fluid leakage into the atmosphere.
This plan is commonly used in non-contacting gas seals for compressors, pumps, and other rotating equipment handling hazardous or volatile fluids.
Features
How API Plan 74 Works
- A regulated supply of dry, inert gas (usually nitrogen) is provided at a pressure higher than the process fluid.
- The pressurized gas forms a barrier between the inner and outer seals, preventing process leakage.
- Flow control and pressure regulation systems ensure optimal gas delivery to the seal chamber.
- Gas monitoring instruments help track flow rates and detect potential seal failures.
Benefits
Zero Process Fluid Leakage – Prevents hazardous or toxic emissions into the environment.
Extends Seal Life – Provides stable lubrication, reducing wear and friction.
Eliminates Liquid Contamination – Unlike liquid barrier systems, Plan 74 ensures a dry, clean operation.
Enhances Equipment Reliability – Protects seals from pressure fluctuations and external contamination.
Suitable for High-Speed & High-Pressure Applications – Used in critical industries where dry gas seals are preferred.
Drawbacks
Applications
Warning Notes
Related Technical Papers
Applicable Products
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