Representations of the Rotation and Lorentz Grps and their by I. Gel'fand, et al.,

By I. Gel'fand, et al.,

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53 Centrifugal Pump Lexicon usually consists of braided asbestos-graphite or teflon twine. g. on full load feed pumps up to 150 MW power block size. The very small leakage of mechanical seals (shaft seals) is emitted into atmosphere in the vapour phase at the exit. The frictional heat generated is less than in the case of soft-packed stuffing boxes. A closed circuit cooling system is generally adopted, which is driven by a circulator device on the rotating seal ring when the pump is running, and by natural circulation (thermosiphon action) when the pump is stopped.

P. is warped. The affected locations are the throttling gaps at the impeller inlet, at the throttling bush in the diffuser and at the balancing device. The matching of appropriate construction materials at these locations, consisting of corrosion-resistant chrome steels with special alloy additions ensures relatively good emergency running conditions even at high circumferential velocities. Any >> wear at close clearance gaps is always associated with a drop in efficiency. Fig. 7: Regulation systems of sealing condensate feed to floating seals KSB Bombas Hidráulicas S.

Feed pumps for nuclear power stations of 1300 MW output are presently constructed for mass flows up to 4000 t/h and discharge pressures of 70 to 100 bar. Up to 1950 approx. b. f. ’s were constructed of unalloyed steels, and since then of 13 to 14 % chrome steels. This change of materials was made necessary by the introduction of new feedwater treatment processes. p. with speeds of 5000 to 6000 min -1 . ’s for conventional 750 MW power blocks are constructed with four or five stages, with stage pressures up to 80 bar.

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