750-96 (revised 2010)
Model CB Packaged Boiler Manual
2-1
CHAPTER 2 The Pressure Vessel
2.1 — Overview
This chapter is devoted primarily to the waterside care of the pressure vessel.
The type of service that your boiler is required to provide has an important bearing in the amount of waterside
care it will require.
The subject of water supply and treatment cannot adequately be covered in this manual. Nevertheless, it is of
prime importance.
Feedwater equipment should be checked and ready for use. See that all valves, piping, boiler feed pumps, and
receivers are installed in accordance with prevailing codes and practices.
Water requirements for both steam and hot water boilers are essential to boiler life and length of service. Constant
attention to this area will pay dividends in the form of longer life, less downtime, and prevention of costly repairs.
Care taken in placing the pressure vessel into initial service is vital. The waterside of new boilers and new or
remodeled steam or hot water systems may contain oil, grease, or other foreign matter. A method of boiling out
the vessel to remove these accumulations is described later in this chapter.
The operator should be familiar with this chapter before attempting to place the unit into operation.
Boilers, as a part of a hot water system, require proper circulation and the system must be operated as intended
by its designer to avoid shock or severe, possibly damaging, stresses occurring to the pressure vessel.
2.2 — Construction
All pressure vessels are constructed in accordance with the ASME Boiler and Pressure Vessel Code. Steam boilers
for operation at pressure not exceeding 15 psig, but within the limits of good safety valve practices, are con-
structed to Section IV, Low Pressure Heating Boilers, of the Code. Hot water boilers for operation with water tem-
perature not exceeding 240º F may be built up to 160 psig design and constructed to Section IV of Low Pressure
Heating Boiler Code. For water temperatures between 240º - 250º F, minimum design pressure is 60 psig, but
because of static the head may be as high as 160 psig and constructed to Section IV of Low Pressure Heating
Boiler Code.
Courtesy of: C3 Surplus LLC
Surplus Industrial Superstore
305-428-2777
https://www.c3surplus.com
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