During port stay,
the auxiliary boiler is used alternatively depending upon the steam demand.
The exhaust gas economizer is out of action as the main propulsion machinery will remain stopped in port.
The steam pressure on the auxiliary boiler and economizer will be almost equal as both the steam spaces are connected to each other.
The boiler is fed by the boiler water feed pumps, which take suction from the hotwell or the condensate return tank.
The economizer circulating pumps take suction from the auxiliary boiler and feed the economizer when the main engine is running.
In port, the economizer circulating pumps will usually be stopped after the economizer cools down sufficiently.
At sea, the exhaust gas from the main propulsion machinery will heat up the water in the economizer, which ultimately becomes steam in the auxiliary boiler steam drum.
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