How many high-pressure air compressors (HPACs) are found in each MMR?

Each Main Machinery Room (MMR) on a naval vessel typically contains two high-pressure air compressors (HPACs). These compressors are essential for various functions, including providing the necessary air supply for starting gas turbines, operating pneumatic tools, and maintaining the vessel's air systems.

Having two HPACs ensures redundancy and reliability. In the event of a failure with one compressor, the second can continue to supply high-pressure air, allowing operations to proceed without interruption. This design enhances the overall safety and effectiveness of the vessel's systems, reflecting best practices in engineering designs for critical operations aboard naval ships.