Gill & Pajek correction

Mike T., Swampeast MO

My old books give an average of 1.5 pints of water per square foot EDR <I>in a column radiator</I>.

1.5 pints = 0.025 cubic feet

0.807 pints per square foot EDR <I>in a thin tube</I> radiator

0.807 pints = 0.014 cubic feet

1.75 pints per square foot EDR </I>in a flue radiator</I>

1.75 pints = 0.029 cubic feet

I have no volume data for "slenderized" radiators. Would guess about 25% less than thin fin tube.

David Nadle

I think there are two minor errors

in "Balancing Steam Systems" by Gill & Pajek. I have the PDF version purchased from the store.

In the table, "How Much Air Is In A Pipe?" 0.014 is given as the ft^3 per linear ft figure for 5" pipe. 0.14 is the correct value.

In the table, "How Much Air Is In A Radiator?" 0.08 is given as the ft^3 per ft^2 EDR figure for cast iron radiant 5" deep. I believe this is ten times too high and should be 0.008 instead. Using a Burnham catalog of radiators of this type I calculate a value of 0.009 based on water voulume.