Chapter 1 — Basics of Firetube Operation
1-12 Part No. 750-184
the head - opposite the boiler steam space - is almost completely
filled with refractory. When sealing the door, follow instructions as
outlined in Section 8 of this manual.
Front Head
The Ohio Boiler utilizes an insulated inner (intermediate) front door.
Due to the two-pass design, the front head lacks the second-to-third
pass baffle found on comparable CB-LE boilers. See Section 8 for
front head sealing procedure.
Dimpled Tubes
The second-pass tubes are 2” O.D. and of dimpled design for
increased heat transfer.
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