Experienced-Based Rules of Chemical Engineering

[Freeman]

Refrigeration and Utilities
A. A ton of refrigeration equals the removal of 12,000 Btu/h (12,700 kJ/h) of heat
C. Cooling tower water is received from the tower between 80-90 °F (27-32 °C)
and should be returned between 115-125 °F (45-52 °C) depending on the size
of the tower. Seawater should be return no higher than 110 °F (43 °C)
D. Heat transfer fluids used: petroleum oils below 600 °F (315 °C), Dowtherms
or other synthetics below 750 °F (400 °C), molten salts below 1100 °F (600 °C)

E. Common compressed air pressures are: 45, 150, 300, and 450 psigF. Instrument air is generally delivered around 45 psig with a dewpoint 30 °F below the coldest expected ambient temperature.

End article

Experienced-Based Rules of Chemical Engineering

By Eng. Chris Haslego