----------+-----------------------------------------
Height | DIAMETER OF BOILER IN INCHES.
from tubes+-----+-----+-----+-----+-----+-----+-----
to shell.| 36 | 42 | 48 | 54 | 60 | 66 | 72
----------+-----+-----+-----+-----+-----+-----+-----
15 | 206 | | | | | |
16 | 235 | | | | | |
17 | 264 | 297 | | | | |
18 | | 331 | 365 | 396 | | |
19 | | 316 | 404 | 439 | | |
20 | | 401 | 444 | 483 | 519 | |
21 | | | 485 | 528 | 568 | |
22 | | | 526 | 574 | 618 | |
23 | | | | 620 | 668 | 714 |
24 | | | | 667 | 720 | 769 |
25 | | | | 714 | 772 | 825 |
26 | | | | 761 | 824 | 882 | 937
27 | | | | 809 | 877 | 940 | 998
28 | | | | | 930 | 998 |1061
29 | | | | | 983 |1056 |1124
30 | | | | |1037 |1115 |1187
31 | | | | | |1174 |1252
32 | | | | | |1234 |1317
33 | | | | | | |1382
34 | | | | | | |1447
----------+-----+-----+-----+-----+-----+-----+-----