Example 3-18 Maximum Temperature Rise Using Boiler Feed Water

Example 3-18 Maximum Temperature Rise Using Boiler Feed Water 

The vapor pressure to which the water may rise before it flashes is 17.19 psia + 7.79 psia = 24.98 psia. 

From steam tables (or fluid vapor pressure tables), read at 24.98 psia (for water of this example), temperature = 240°F. 

Therefore, allowable temperature rise of the water (this example) = 240° - 220°F = 20°F. 

For cold liquids, general service can often handle ATr of up to 100°F, a rule with approximately 20% factor of safety  

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