Dunkirk Empire II Installation, Operation, Repair And Parts Manual page 15

Number of Total Volume
Boiler Section (Gallons)
3
4
5
PIPE SIZE
9.6
11.6
13.7
Divide total length of piping in feet by appropriate factor
in table to determine volume in gallons.
COPPER PIPE
FACTOR
½" 82.5
¾" 40.0
1" 23.3
1-¼" 15.3
1-½" 10.8
2" 6.2
STEEL PIPE
FACTOR
63.5
36.0
22.2
12.8
9.5
5.8