API Plan 66A
API Plan 66A – Containment Seal with a Single Restrictive Bushing
API Plan 66A is a leakage containment system designed for single mechanical seals.
It uses a single restrictive bushing to control and minimize process fluid leakage, reducing emissions and improving safety. Any small amounts of liquid leakage are directed to a drain or collection system, preventing uncontrolled fluid loss.
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Features
How API Plan 66A Works
- Process fluid leakage from the primary seal enters the cavity between the seal and the restrictive bushing.
- The restrictive bushing slows down the leakage, creating a controlled flow restriction.
- Any liquid leakage is redirected to a drain or collection system, preventing fluid buildup around the seal.
- If the leaked fluid is vaporized, it may safely dissipate into the atmosphere under controlled conditions.
Comparison with API Plan 66B
- Plan 66A: Uses one restrictive bushing with a drain or collection system.
- Plan 66B: Uses two restrictive bushings, providing better leakage containment by further reducing leakage escape to the atmosphere.
API Plan 66A is a cost-effective containment solution for single mechanical seals, offering controlled leakage management while maintaining safety and compliance in industrial applications.
Benefits
- Minimizes Leakage to the Atmosphere – Reduces fluid emissions, improving environmental compliance.
- Enhances Equipment Safety – Prevents uncontrolled leakage, reducing the risk of contamination or hazards.
- Simplifies Seal System Design – Requires no external fluid reservoirs or pressurization systems.
- Lower Maintenance & Operating Costs – Compared to dual-seal systems, this plan is simpler and more cost-effective.
Drawbacks
- Does Not Completely Eliminate Leakage – Small amounts of leakage still occur but are controlled.
- Less Effective for High-Pressure Applications – May not be suitable for systems with high seal chamber pressures.
- Potential for Bushing Wear Over Time – The restrictive bushing may degrade, requiring periodic replacement.
Applications
- Oil & Gas Industry – Used to control small hydrocarbon leaks in pumps.
- Chemical & Refining Processes – Helps manage leakage in hazardous fluid handling.
- General Industrial Pumps – Suitable for applications requiring moderate leakage containment without a full dual-seal system.
Warning Notes
Related Technical Papers
Applicable Products
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