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48 Centrifugal Pump Lexicon The velocity triangles on a flow line at the b. inlet (subscript 1) and on the same flow line at the b. , taking the b. thickness and possible b. cascade reactions into account. The connection from b. inlet to b. ), sometimes by means of an arc of parabola, an S-shaped curve or another analytical curve. As a general rule, the b. inlet is designed as a shock-free entry in an invitational approach flow (vortex flow). A well-known exception to this rule is given by the inducer.
S operate at temperatures of the fluid pumped of 160 to 180 ºC, and in exceptional cases higher temperatures still. 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 .
Separation. Such flow separations should be avoided as far as possible by design measures and hydrodynamic streamlined devices (fittings, diffuser, diffuser device). g. 1. becomes turbulent immediately downstream of the laminar separation and then comes in contact again. 1. plays an important part in flow through pipes (piping). At the pipe inlet there is often a constant velocity distribution. 1. is formed at the wall, and its thickness increases with increasing distance downstream from the pipe inlet.