Download Centrifugal Pumps and Allied Machinery by H.H. Anderson PDF

By H.H. Anderson

This e-book may be of important curiosity to all engineers and architects fascinated by centrifugal pumps and generators. together with statistical details derived from 20000 pumps and seven-hundred generators with capacities of 5gpm to 5000000gpm, this publication bargains the widest variety and scope of data presently to be had. Statistical analyses recommend functional equipment of accelerating pump functionality and supply worthy facts for brand new layout elements.

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Additional resources for Centrifugal Pumps and Allied Machinery

Example text

As mentioned, above, water turbine efficiencies are expected to be about 1% above pump efficiencies but, on the other hand, many of the earlier turbines had a lower efficiency and size than those of more recent design. Bearing these aspects in mind, it will be seen that the author's formula for efficiency when extrapolated to the larger sizes showed reasonable agreement with water turbine practice. The scatter and slope of the Gibson tests are comparable to those of the author's formula. Zanobetti (Ref 16) shows 350 turbine efficiencies 10 to 100m2/s generally grouped about the centre line of this chart with very little efficiency variation for shape number.

PFLEIDERER, C. 1932. 'Die Kreiselpumpen', second edition (Springer, Berlin). , 'Centrifugal Pumps, An Alternative Theory'. Proc. IME 1947 Vol 157 We 27. , 'The Flow in Volutes and its Effect on Centrifugal Pump Performance', Proc. E. 1963 Vol 177 No 31. , 'Centrifugal and Axial Flow Pumps' (Wiley) 1957. ASME 61 WA320. 7. 8. 9. 39 SHAPE NUMBER, FLOW AND EFFICIENCY The preceding chapters considered, in a very preliminary way, the relationship between the dimensions of a pump and its performance. Since the generation of head is directly affected by the efficiency of the pump, consideration will now be given to pump efficiency.

NPSH P/2 =constant This constant is seen to be the square of the shape number using, however, the NPSH instead of the head. The inlet shape number now becomes N ss equals rev/min {TiS NPSH 1/2 and forms a reference for cavitation studies. 100 . . - - - - - - - - - - - - - - - - - - - - - , 80 :I: en 0.. - ~C) ~ ~ U)tO U) E 5 ~>Q) 10 c+ 0 1 7 3 E 5 5 Q) - j§! 2 0. ~........ 1 can be labelled with appropriate inlet shape numbers as follows: N ss 4 000 for operation of normal pumps N ss 6 000 for cavitation failure of normal pumps N ss 6 000 for operation line of special pumps having a large impeller eye, special inlet design and/ or large physical size N ss 8 000 for cavitation failure line of special pumps It will be seen that the margin of safety between operation and cavitation failure is 2000 inlet shape numbers, corresponding approximately to 50% of the NPSH.

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