What is the correct procedure for servicing a waterlogged compression tank?

The correct procedure for servicing a waterlogged compression tank involves isolating the compression tank, opening the air vent, draining the tank, and then refilling it slowly. This method ensures that the air cushion in the compression tank is restored, which is essential for its functionality in maintaining system pressure and preventing hydraulic shock.

When the tank is waterlogged, it means that the air bladder inside the tank has lost its ability to compress effectively due to an excess of water. By isolating the tank from the system first, you prevent water from backflowing into the system during the process. Opening the air vent allows any built-up pressure to escape, which is critical for safety and ensures complete drainage of the water. Draining the tank removes the excess water that is causing the issue. Finally, refilling the tank slowly helps to re-establish the necessary air cushion, allowing the tank to operate efficiently and maintain proper pressure levels once more.

Other options might not address the requirement to fully drain the tank or may compromise the safety and effectiveness of the tank's operation. For instance, simply refilling the tank without draining would not resolve the waterlogging issue, and leaving the tank connected could lead to further complications in the entire system.