UFC 3-240-13FN
25 May 2005
Figure 3-3. Components of a Simple Steam Boiler System
Backflow Preventer
Makeup
Water (M)
Makeup
Water
Treater
Storage
Tank
(Optional)
Non-
C d asebl
G is
Preheater
Steam Lines
(Optional)
Condensate
Steam Header (E)
Return ( R )
Meter
Meter
Steam
Chemical Injection
Deaerator
Superheater
After
(Oxygen Scavenger)
(Optional)
Boiler
Section
Storage
Section
Meter
Feedwater (F)
Steam
Drum
Feed
= (M+R)
Pump
Preheater
Economizer
Boiler
Drain
Tubes
(Optional)
Boiler Tubes
Downcomers
Wa
Cir
ter
cul
Re
ati
tur
on
Mud
Pre-Boiler
n
Continuous
Continuous
Drum
S ti
Blowdown (B)
Blowdown
Steam
Boiler
Flash Drum
(Optional)
Intermittent
Blowdown
3-1.2.1
Pre-Boiler. The pre-boiler section of a steam boiler encompasses the
boiler system's structural components that hold, move, and treat the water before the
water enters the boiler. These pre-boiler system components include the integrated or
supplementary water pre-treatment equipment used to process the boiler makeup
water, the deaerator used to remove oxygen and other non-condensable gases, and the
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