Utilizing an On/Off Boiler Feedwater System:
- During feedpump ON operation, the feedpump sends the feedwater through the economizer and into the boiler.
- When the feedpump shuts OFF, the small circulation pump starts and circulates water in the closed piping loop to maintain flow in the economizer to avoid a stagnant flow situation. A stagnant flow situation will lead to economizer steaming and hammering, possibly leading to economizer and boiler damage.
- The check valves on the boiler inlet and the feedpump discharge keeps the water flow in the new loop.
- When the feedpump goes back into an ON condition, the water in the circulation loop is flushed into the boiler, maintaining heat recovery at ALL operating conditions.
- Contact factory for circulation line size and length and circulation pump selection requirements.
