R016600x

STEAM GENERATOR & FLUID HEATER INSTALLATION MANUAL

particles that could damage the transfer and generator fuel pumps. The strainer should have a mesh not larger than 0.015 inch. The inlet pressure to the Clayton pump must not exceed 25 psi. A higher inlet pressure will damage the pump seals.

NOTE The transfer pump must be equipped with a foot valve to avoid draining fuel back into the storage tank.

Both the transfer and Clayton fuel pumps should run continuously, circulating oil under pressure through the heaters to the burner. Excess oil flows through the Fuel Pressure Regulator to the inlet of the fuel pump. In a burner off cycle, the Oil Recirculating Valve opens and bypasses the fuel to the inlet of the fuel pump. This oil is at a higher temperature than the oil in the transfer loop. With this system, all the high temperature oil is confined to the burner loop. Oil heated in the transfer loop should be limited to 20° F below flash point (this temperature depends on oil viscosity). 2.1.4 Supply and Return Lines Install fuel supply and return lines to the fuel pump from the storage tank, using appropriately sized piping for the required flow. The fuel supply system will depend on the burner design, storage tank, grade of oil, the number of generators, and local codes.

NOTE Heavy oil supply and return lines must be heat traced (steam or electric) and insulated. Do not use galvanized pipes.

2.1.5 Oil Preheating Equipment (See Heavy Oil System Flow Diagram) The Clayton heavy oil-fired unit uses an air atomizing burner. For proper combustion the oil vis- cosity must be a minimum of 55 Saybolt Seconds Universal (SSU). For oil that has a higher viscosity, controlled heating must be applied. The heated fuel temperature requirement varies with the initial vis- cosity of the oil. (see chart R-8571). A steam heater is provided to accomplish the required rise in tem- perature. 2.1.6 Electric Immersion Heater Option An Electric Immersion Heater option can be provided with the generator. It is controlled by a Magnetic Controller Switch which is controlled by the Oil Heater Thermostat Switch. This switch is set to a slightly lower cut out point (10°–15° F) than the steam heater operating temperature. This permits the steam heater to do most of the heating. The electric heater is used primarily during start-up when suffi- cient steam is not available.

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Supplmt02_HeavyOil_c.fm

04/22/2015

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