- TOTAL DIFFERENTIAL HEAD (THD)
- AVAILABLE NPSH
- PRESSURE Conversion
- VISCOSITY
- FLOW
- TEMPERATURE Conversion
- SPECIFIC GRAVITY
- AFFINITY LAWS
- POWER
- O-RING TEMPERATURE LIMITATIONS
- PROPERTIES OF WATER
System Head = total discharge head – total suction head
H = hd – hs
hd = hsd + hpd + hfd | hs = hss + hps = hfs |
where: | |
hd = total discharge head | hs = total suction head |
hsd = discharge static head | hss = suction static head |
hpd = discharge surface pressure | hps = suction surface pressure |
hfd = discharge friction head | hfs = suction friction head |
Available NPSH is “the difference between the total suction head and the vapor pressure of the liquid, in feet of liquid, at the suction flange.”
hsv = hsa – hypa
where:
hsv = available net position suction head, in feet of liquid
hsa = total suction head, in feet of liquid, absolute
hypa = vapor pressure of liquid at suction nozzle, in feet of liquid, absolute
Head (ft.) = psi x 2.31 / sp. gr.
PSI = head (ft.) x sp. gr. / 2.31
Lbs./sq. in. = In. of Mercury x .491
Lbs./sq. in. = Atmospheres x 14.7
mm hg. = Atmospheres x 760
Centistokes x 4.64 = SSU(approx.)
Centipoise Sp. Gr. = Centistokes
Gallons per minute (GPM) x 3.785 = Leters per minute
°C = 5/9 (°F – 32)
°F = 9/5°C + 32
sp. gr. = weight of liquid
sp. gr. = weight of water
weight of water = 62.4 Lb./cu.
weight of water = 8.3 Lb./gal.
BHP = GPM x TDH x sp. gr.
BHP = 3960 x Eff.
BHP = GPM x PSI
BHP = 1715 x Eff.
KW = 0.746 x H.P.
Torque = (Ft. Lb.) = HP x 5260
Torque = (Ft. Lb.) = RPM
HP = E(volts) x I(Amps) x Eff. X P.F. x 1.732
HP = E(volts) x I(Amps)746
I(amps) = HP x 746
I(amps) = E(volts) x Eff. X P.F. x 1.732
Material[Code]
Temperature Limits
Modified Polytetrafluorethylene [TM]
Low: -100 °F (-73 °C) High: 300 °F (149 °C)
Viton [VA]
Low: -20 °F (-29 °C) High: 400 °F (204 °C)
Perfluoroelastomer (Kalrez) [KAL]
Low: -36 °F(-38 °C) High: 550 °F (287 °C)
Temp |
Specific |
Vapor Pressure |
||
Degrees °F |
Gravity |
Ft. of H2O |
In. Hg |
In. HgVac |
60 |
1.000 |
0.6 |
0.53 |
29.39 |
100 |
0.994 |
2.2 |
1.94 |
27.98 |
150 |
0.982 |
8.8 |
7.76 |
22.16 |
200 |
0.965 |
27.6 |
24.36 |
5.56 |
210 |
0.961 |
33.9 |
29.92 |
0.00 |
212 |
0.959 |
35.4 |
31.33 |