Why canister vent is provided in condensate extraction pump?

A canister vent is provided in a condensate extraction pump in a thermal power plant to prevent the buildup of air and other gases in the pump casing. As the pump operates, air and other gases can enter the casing and collect in the top of the casing, reducing the efficiency of the pump and potentially causing damage.

The canister vent is a small opening in the top of the pump casing that is connected to a vent pipe. The vent pipe is typically routed to a location where the air and other gases can be safely vented in to the condenser.

By providing a canister vent, the air and other gases that collect in the top of the pump casing can be continuously vented to the condenser, preventing the buildup of pressure and ensuring that the pump operates efficiently. This helps to prevent damage to the pump and reduces maintenance requirements.

In addition, the canister vent also helps to prevent the formation of a vacuum inside the pump casing. A vacuum can occur when air and other gases are not properly vented from the pump, leading to a loss of suction and reduced pump efficiency. The canister vent helps to prevent this by allowing air and other gases to escape from the pump casing, ensuring that the pump operates effectively and efficiently.