Air Seal PRIMAIR is a very advanced stern tube sealing system. The air seal technology in PRIMAIR physically separates the stern tube oil from the sea through an air space and has a drain line that goes back to the engine room. Cross contamination is, therefore, not possible. The system is engineered to discharge air through the seal box. The air pressure varies depending on the outside seawater pressure, while the airflow is stable.
The PRIMAIR system works based on ‘Constant Air Flow/Variable Pressure’ – technology. This system is engineered to discharge air through the seal box. The air pressure varies while the air flow is stable. The air pressure will vary to keep in sync with the outside seawater pressure. The variable pressure method maintains a perfect pressure balance inside the seal box. This perfect pressure balance prevents flexing of the seal ring thereby reducing stress on the seal ring material. It also reduces wear on the seal ring and chrome steel liner because the pressure on the seal rings is lower that within a conventional system. With the PRIMAIR system, there is absolutely no oil leakage possible. PRIMAIR meets the VGP law requirements even when using conventional lubricants. PRIMAIR is class approved by all major classification societies.
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