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 sections - the 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.

Installation

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 5-17