COC = Bmhos / Fmhos

EQUATION

or

(5)

5000 mhos / 250 mhos = 20 COC

b) The percent blowdown is:

%B = 100/COC

EQUATION

or

(6)

100/20 = 5%

c) If the boiler is producing 5 kilograms per second of steam (40,000 pounds

per hour), the blowdown must be:

EQUATION

B = E (COC - 1)

(7)

= 5.0 (20 - 1) = 0.26 kg/s (2105 lb/hr)

d) The feedwater is calculated to be:

EQUATION

F = E + B = 5.0 + 0.26 = 5.26 kg/s (42,105 lb/hr)

(8)

This is equivalent to 5.3 liters per second (5054 gallons per hour at 8.33

pounds per gallon). This example is illustrated in Figure 3-9.

3-1.6

the water from the external water treatment system added to the boiler system

44

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