Chapter hvac engineering Fundamentals: Part 1 Introduction

10.4.3
Water tube boilers
In water tube boilers, the water is inside the boiler tubes and the
products of combustion surround the tubes. There is a wide variety of
configurations, including slant-tube (Fig. 10.1), bent-tube (D-type),
Equipment: Part 2
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Chapter Ten
Figure 10.1
Slant-tube water tube boiler.
O-type, C-type, and express type. They range in size from small resi-
dential units to large utility boilers. They have an extended service
life if proper water treatment and maintenance are provided. Water
tube boilers may be factory-assembled and tested, package type, or
field-assembled; the field-assembled boiler is more common in sizes
above 200,000 lb / h capacity. Operating pressures of 150 to 900 lb / in
2
gauge or greater are used where process requirements are severe or
where power generation is a consideration.