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Feedwater Pump

Feedwater Pump
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The Clayton Feedwater Pump The Clayton feedwater pump is a packless/sealless, positive displacement type, oil reservoir, diaphragm pump that utilizes the diaphragm to isolate the feedwater in the pump column from the hydraulic oil in the crankcase. Water is drawn through the inlet and discharged through the outlet check valves as the column of water is moved by the diaphragm. For modulating units, feedwater flow is controlled by varying the speed of the feedwater pump using a variable speed drive. Since this is a positive displacement pump, flow varies linearly with speed. For example, at 40% of boiler output, the pump runs at 40% of full/maximum speed. For step-fired uits, flow is varied within the pump itself, or by operating in speed steps.

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Clayton Feedwater Pump Helical Coil Heat Exchanger The Clayton, designed and manufactured, pump (Figure 1) is a volumetric, diaphragm type designed to deliver a fixed volume of water into the heating coil during operational loads, sufficiently to maintain a wet tube heating coil under all load conditions. The pump contains no packing box and can handle water up to 464° F (240° C). Output is linear with the pump speed and not affected by back pressure. The pump diaphragms are operated hydraulically by oil displaced by reciprocating pistons (Figure 2) within the pump crankcase. The pistons...

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