F - Mech Eng,Light,Heat,Weapons – 22 – D
Patent
F - Mech Eng,Light,Heat,Weapons
22
D
122/23
F22D 5/26 (2006.01) F04B 13/02 (2006.01) F04B 43/067 (2006.01) F04B 49/02 (2006.01) F22D 5/32 (2006.01) F22D 11/02 (2006.01)
Patent
CA 1262664
METHOD AND APPARATUS FOR SUPPLYING FEEDWATER TO A FORCED FLOW BOILER ABSTRACT OF THE DISCLOSURE An apparatus and method of supplying feedwater to a forced flow boiler or the like as described. A positive displacement pump having a plurality of dis- crete pumping elements is arranged to pump feedwater from an inlet to the boiler. The pump includes bypass valves which, when open, disable the pumping action of an associated pumping element. Control means responsive to the demand for water in the boiler are arranged to disable a selected number of the pumping elements so that the rate of water supplied by the remaining elements, if operated continuously, would just exceed that required. The control means is further arranged to disable at least one of the remaining pumping elements on a periodic basis so that the ratio of time that the element is enabled to the time for one period multiplied by the water flow rate supplied by said element, if operated continuously, equals the difference between the total demand for water and the rate supplied by the pumping elements enabled on a full-time basis.
487337
Fegraus Clark E.
Jennings William S.
Clayton Manufacturing Company
Fegraus Clark E.
Jennings William S.
Rogers & Scott
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