What is another term for the supply tank in an air brake system?

In an air brake system, the supply tank is commonly referred to as the wet tank. This tank collects and stores compressed air from the compressor, and it is called "wet" because it is designed to hold not only air but also any moisture that may accumulate during the compression process. The wet tank usually includes a drain valve for the regular removal of this moisture, which is vital for ensuring the effective operation of the air brake system and minimizing corrosion and freezing issues.

While other terms like "dry tank" or "storage tank" may refer to components associated with air storage in different contexts, they do not accurately describe the function or characteristics of the supply tank as the wet tank does. The service tank specifically refers to the tank that feeds air directly to the braking system, distinguishing it from the primary supply tank. Therefore, using "wet tank" captures the role and purpose of the supply tank in the air brake system effectively.