Figure 5-15.Rear view of tumbler.
and modulate or stop the burner by steam demand.
Standard equipment includes safety devices for
protection against water fai I ure, burner failure, too
much pressure, and electrical overload. A flow
diagram of the water and steam circuit of the generator
is shown in figure 5-16. Supply water enters the
feedwater section of the water pump from the hot
well/feedwater tank and is pumped directly to the
steam accumulator. The circulating liquid is drawn
from the accumulator by the circulating section of the
water pump and pumped into the single-passage
heating coil, and then back to the accumulator where
the steam is separated.
The pump is driven directly by an electric motor
and contains no packing boxes. It is arranged in two
sectionsthe feedwater section and the circulating
section. The pump diaphragms are operated
hydraulically by oil displaced by reciprocating pistons
within the pump. A built-in solenoid-operated bypass
valve is on the hydraulic pressure section of the
feedwater pump to prevent the feedwater section from
pumping when the valve is open. The valve is actuated
by the water level control according to the liquid level
in the accumulator.
When installing a steam generator, always use the
manufacturer's instructions. Pay attention to the fuel,
water, electrical, and venting facilities when installing
the boiler and ensure the following:
Ample clearance should be allowed on all sides
to make operation and maintenance easier.
When installing external piping, use pipe unions
next to the boiler connections to allow easy
removal of parts for inspection and cleaning.
The boiler is equipped to burn No. 2 diesel fuel
oil. Connect the fuel supply line to the inlet
connection on the fuel filter. Connect the return