CleaverBrooks CBLE, Operation And Maintenance Manual

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750-91 (revised 2009)
Model CB-LE Packaged Boiler Manual 1-1
CHAPTER 1
Basics of Firetube Operation
1.1 — Introduction
Firetube boilers are available for low or high pressure steam, or for hot water applications. Firetube boilers are typ-
ically used for applications ranging from 15 to 800 horsepower. A firetube boiler is a cylindrical vessel, with hori-
zontal tubes passing through and connected to the front and rear tube sheets. The vessel contains the water and
absorbs the energy generated from the flame. The front door and rear door provide the seal to contain the hot
combustion gasses. Baffles designed into the doors serve to redirect the combustion gasses through the various
firetube passages. The flame originates in the furnace. As the combustion gasses travel down the furnace and
through the various firetube channels, heat from the flame and combustion gasses is transferred to the water.
Transferred energy develops into the required steam or hot water. The primary purpose of the boiler is to supply
energy to the facility’s operations — for heat, manufacturing processes, laundry, kitchen, etc. The nature of the
facility’s operation will dictate whether a steam or hot water boiler should be used.
The general information in this manual applies directly to Cleaver-Brooks Model CBLE Boilers in sizes ranging
from 250 through 350 boiler horsepower for the following fuels:
•
Series 100 Light Oil (No. 2) only
•
Series 200 Light Oil (No. 2) or Gas
•
Series 400 Heavy Oil (No. 6) or Gas
•
Series 600 Heavy Oil (No. 6) only
•
Series 700 Gas only