750-177 3-1
CHAPTER 3
Pressure Vessel Care
A. General 3-1
B. Water Requirements (Hot Water Boilers) 3-1
C. Water Requirements (Steam Boilers) 3-4
D. Water Treatment 3-4
E. Blowdown 3-5
F. Cleaning 3-6
G. Boilout 3-7
H. Washing Out 3-9
I. Periodic Inspection 3-10
J. Preparation For Extended Layup 3-11
A. GENERAL
This chapter is devoted primarily to the waterside care of the pressure vessel.
Proper water supply and treatment are essential to boiler life and length of service. Proper water treatment
will pay dividends in the form of longer life, less downtime, and prevention of costly repairs.
Hot water boilers require proper circulation. The
system must
be operated as intended by its
designer in order to avoid the possibility of thermal
shock with severe stress to the pressure vessel.
Figure 3-1: Upper Drum (Hot Water)
A
B
C
C
A. HOT WATER OUTLET
B. AIR VENT TAPPING
C. PRESSURE/TEMPERATURE GAUGES
Although it is of prime importance, the subject of
water supply and treatment cannot adequately be
covered in this manual. For specific information or
assistance with your water treatment
requirements, contact your local Cleaver- Brooks
authorized representative.
B. WATER REQUIREMENTS (HOT
WATER BOILERS)
Air Removal
The hot water outlet (Figure 3-1) is located in the
top drum of the boiler. This location reduces the
possibility of released air (which is trapped at the
top of the drum) from entering the system. Any air
(or oxygen) that may be released in the boiler will
collect at the top of the upper drum, where it will
escape through the air vent tapping. The tapping
must be properly piped to the expansion tank or a
stand pipe
and air bleeder to remove gases that
collect at the top of the drum.
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