What range should the feedwater hydrazine level be maintained in ships with Chelant continuous injection systems?

Maintaining the feedwater hydrazine level within the range of 10-40 PPB is critical for preventing corrosion in boiler systems. Hydrazine serves as an oxygen scavenger, eliminating dissolved oxygen in the feedwater, which can lead to oxidative corrosion of the boiler and associated piping. This specific range has been established to ensure effective corrosion control while also avoiding excessive levels that could lead to other operational issues.

Levels below 10 PPB may not provide sufficient protection against oxygen, while levels above 40 PPB could contribute to the formation of hydrazine breakdown products and potentially result in harmful effects within the boiler system. Thus, the optimal range balances the need for robust corrosion protection with operational stability in continuously injected systems.