Double Suction Single Stage Barrel Casing Type Boiler Feed Pump

Abstract: For critical applications, forged barrel casing is preferred for reasons of safe and defect free casing material over casted casing, even though casted casing is simpler, cheaper, ease of maintenance due to less components. Barrel casing [1], kind of thick cylinder, encompasses double flow volute casing called inner casing [6] or core that guides and diffuses high velocity fluid leaving impeller [22] passage. The impeller [22] is mounted on shaft [3]. In present invention, features enabling low L/D ratio Double Suction Single Stage Barrel Casing Type Boiler Feed Pump are disclosed. Novel design features to improve rotor dynamics, casing stability and smooth flow to impeller [22] suction are revealed. In the invention, Suction [4] and Discharge [5] nozzles are welded to outer casing [1], wherein nozzles [4,5] are in same plane. When L/D ratio becomes too low, Lugs [17] are welded to end covers [2] for higher stability of casing.

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