these two equations:

T = temperature rise, degrees F

H = total pump head, FT

C = specific heat of liquid

E = pump efficiency, in decimal point

Or, use the equation:

T = temperature rise, degrees F

BHP= brake horsepower

WHP= water horsepower

Q = capacity, lbs/hr

C = specific heat of liquid

use C=1.0 for water, C=0.5 for hydrocarbons if actual value is unknown

The equations neglect the effect of heat loss through the case and assume that

none of the liquid is being recirculated back to pump suction.

degrees F. This criteria was first established for boiler feed pumps and may be a

conservative value for cold water application but may be excessive for other

service such as cryogenic.

prevent excessive temperature rise.

efficiency of 80%. What would be the temperature rise of the liquid at the pump

discharge?

Solution: T = [(5000/{778x1}) / ({1/0.8}-1)] = 1.6 degrees F

has an efficiency of 70% and requires 20 BHP. What would be the rise in water

temperature?

Solution: The WHP is BHP x Efficiency, or WHP = 20 x 0.70 = 14 HP

T = [(2545x{20-14}) / (50,000x1)] = 0.31 degrees F

Temperature rise at shut-off operation

Warm-up procedure in high temperature service

Thermal shock

Conversion factors

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