The feedwater was fed into the to the feed
water collector, at the lower end of the tubes, by means of an automatic
feedwater controller.
The heating surface in the boiler consists of a set of continuous tubes running
to-and-fro over the furnace. The steam generated in the tubes passes upwards
into the steam collector, carrying much water with it, but the water is
separated by baffle plates in the steam collector drum. The carried over water
returns to the water collector through vertical pipes, down-comers, at the ends
of the steam collector.
The water level height during full steam operation was about the middle of the
water tube bank.
The boiler's steam outlet was always provided with a pressure reducing valve
that dried the steam since all remaining water evaporated at the lower
pressure.
Belleville boilers worked quite well at pressures between 12 and 16 bar, but
false water level readings was a huge problem.
Later boilers always had an economizer on the top.
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