Flush Tank

Definition - What does Flush Tank mean?

A flush tank is a tank in which water or sewage is retained for periodic release through a sewer.

Flush tanks allow for the storage and release of a large volume of water. It is often attached to equipment which needs to be cleaned by flushing, and may be used to hold reservoirs of water for dishwashers and similar types of devices.

Corrosionpedia explains Flush Tank

A flush tank holds fluid in reserve for flushing. Flush tank mechanisms are generally installed in manholes, primarily at the upstream terminal ends of sewage mains, to facilitate the periodic flushing of the downstream mains.

The most common example of a flush tank is the tank attached to a toilet. It often fills with the assistance of a ballcock, a special type of valve. When the tank empties, the ballcock sinks, opening the valve so that water can enter the tank. As the tank fills, the ballcock rises, eventually floating up above a shutoff point and stopping the flow of water. This allows the tank to fill quickly and automatically. Since flush toilets are typically not designed to handle waste on site, their drain pipes must be connected to waste conveyance and waste treatment systems.

Problems that can develop in flush tanks include:

  • Tank continues to run after tank fills
  • Tank does not fill but water continues to run
  • Tank partially empties
  • Water leaks
  • Nothing happens when the handle is pushed
  • No water pressure

Leakage is the most common problem of flush tanks. Over time, casings and gaskets tend to shrink and change shape, which can allow some seepage. They can also crack. Signs that a flush tank is leaking include water around the tank and the sound of running water in the tank when it hasn't been flushed recently.

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