What is the primary purpose of box heaters in the system?

The primary purpose of box heaters in a system is to protect cylinder air from freezing moisture. These heaters are typically utilized in environments where there is a risk of low temperatures causing moisture in the air to condense and potentially freeze. When moisture freezes within the system, it can lead to blockages, operational failures, and even damage to components. By maintaining a moderate temperature, box heaters help ensure that any moisture present in the air remains in vapor form, thereby preventing it from freezing and causing issues. This function is crucial for maintaining the reliability and efficiency of the system, especially in colder climates or during winter operations.

Other options may seem relevant, but they address different functions that are not the primary role of box heaters. For instance, increasing air pressure typically involves compressors, while cooling hydraulic fluid is managed by separate cooling systems, and reducing system vibrations is achieved through isolation mounts and damping mechanisms rather than through heating elements.