How many 600/150 reducing stations are in each Main Machinery Room (MMR)?

How many 600/150 reducing stations are in each Main Machinery Room (MMR)?

• A. 1
• B. 2
• C. 3
• D. 4

Answer: (B)

These stations are part of the ship’s starting and service air system. A 600/150 reducing station takes high‑pressure air (600 psi) from the air banks and reduces it to 150 psi for use on the service air lines that start and operate machinery and other equipment. Having two reducing stations in each Main Machinery Room provides enough capacity to meet the demand of starting two propulsion plants and to keep the system running if one unit is offline for maintenance or fault. The two units also offer redundancy and load sharing, ensuring reliable service air for essential operations. That’s why the standard setup is two per MMR.

These stations are part of the ship’s starting and service air system. A 600/150 reducing station takes high‑pressure air (600 psi) from the air banks and reduces it to 150 psi for use on the service air lines that start and operate machinery and other equipment. Having two reducing stations in each Main Machinery Room provides enough capacity to meet the demand of starting two propulsion plants and to keep the system running if one unit is offline for maintenance or fault. The two units also offer redundancy and load sharing, ensuring reliable service air for essential operations. That’s why the standard setup is two per MMR.