Pump Minimum Speed and Impeller Dia
Pump Minimum Speed and Impeller Dia
(OP)
Hi,
Can any one expalin indetail from where these values are taken for the calculation of pump minimum specific speed and impeller dia.
1-N=LogQ/2.3026-0.75/.0025
2-D=1840*1.15*SQRT of Head/N
Where,
in equation one, i can't understand about 2.3026 and 0.0025 and in equation 2, 1840, 1.15?
Thanks
MIANCH
Can any one expalin indetail from where these values are taken for the calculation of pump minimum specific speed and impeller dia.
1-N=LogQ/2.3026-0.75/.0025
2-D=1840*1.15*SQRT of Head/N
Where,
in equation one, i can't understand about 2.3026 and 0.0025 and in equation 2, 1840, 1.15?
Thanks
MIANCH





RE: Pump Minimum Speed and Impeller Dia
RE: Pump Minimum Speed and Impeller Dia
RE: Pump Minimum Speed and Impeller Dia
ALL YOU NEED TO KNOW
Offshore Engineering&Design
RE: Pump Minimum Speed and Impeller Dia
1. V = sq rt (2gh) ft/sec ( peripheral speed)
where g = 32.2 ft/sec squared
h = head in feet
2. V= 3.14d * N/(12*60)
where d= dia in inches
N= RPM
DIVIDE BY 12 FOR FEET
DIVIDE BY 60 FOR FT/SEC
combine & solve both formulae for d.
Worley parsons 1.15 constant is an unknown source, probably an allowance factor.
The specific speed formulae i have no knowledge of its source at present.
Offshore Engineering&Design