Page 267 - Know and Understand Centrifugal Pumps
P. 267
Know and Understand Centrifugal Pumps
molybdenum disulfide (moly stopa, 171
grease), 178 stuffing box, 171
Pascal’s Law, 4 Submergence Laws, 243
perfluorocarbon, 206 suction bell, 241
pipe strain, 149 suction bypass, 2 15
positive displacement (PD) pump, 2, suction head, 10
51 suction lift, 10
pressure head (Hp), 92 suction pressure, 7
determining the Hp, 96 suction specific speed, Nss, 66
pressure measurement, 4, 6 sweetzone, the, 140
pressure spikes, 190 synthetic fibers, 174
properties of water, 16
pump efficiency, 50 Teflon, 177
pump head, 5 thermal convection tank, 198
pump installation, 147 thermal jacketed seal chamber, 216
pump maintenance files, 226 throttling, 236
pump packing, 180 total dynamic head (TDH), 92
pump performance curves, 76 total head, 9
pump piping, 238 tramp flange, 104
pump shaft, 142 turbine pump, 58
pump shaft packing, 171 turbo tank, 199
pumping unit, 200 turbulence, 235
pumps in parallel, 120, 122
pumps in series, 120, 124 vacuum, 5
vane passing syndrome, 33
quench and drain, 217 vapor pressure, 24
vaporization, 220
reciprocating action, 172 variable elevations, 110
regenerative turbine pump, 65 variable frequency drive (VFD), 39
rotary action, 173 variable resistances, 116
rotary turbine, 173 vegetable fibers, 171
running alignment, 147 velocity head (Hv), 92
calculating the Hv, 97
seal chamber pressure, 7 velocity head formula, 28
seal failure, premature, 202 vertical turbine pump, 60
shaft deflection, 128 viscosity, 48, 157
shims, 149 volute type pump, 128
skin formation, 220 vortex breakers, 239
slurries and suspended solids, 220
slurry seal, 217 water horsepower (WHp), 45
soft foot, 150 Watt, James 44
solidification, 219 wear bands, 72
specific gravity, 6 wear rings, 48,233
specific speed, Ns, 73
speed, 40 zerk (zirk) fitting, 163
static head (Hs), 92
determining the Hs, 96
