Chapter 1 — Basics of Firetube Operation
Part No. 750-184 1-5
Steam and hot water boilers are defined according to design
pressure and operating pressure. Design pressure is the maximum
pressure used in the design of the boiler for the purpose of
calculating the minimum permissible thickness or physical
characteristics of the pressure vessel parts of the boiler. Typically,
the safety valves are set at or below design pressure. Operating
pressure is the pressure of the boiler at which it normally operates.
The operating pressure usually is maintained at a suitable level
below the setting of the pressure relief valve(s) to prevent their
frequent opening during normal operation.
The type of service that your boiler is required to provide has an
important bearing on the amount of waterside care it will require.
Waterside care is of prime importance. For specific information or
assistance with your water treatment requirements, contact your
Cleaver-Brooks service and parts representative. Failure to follow
these instructions could result in equipment damage
Feedwater equipment should be checked and ready for use. Be sure
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
water requirements will pay dividends in the form of longer life, less
down-time, 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 accumulations is described in Chapter 3.
The operator should be familiar with Chapter 3 before attempting to
place the unit into operation.
C. CONSTRUCTION
Steam boilers designed for 15 psig and hot water boilers designed
for 250°F at 125 psi or less are constructed in accordance with
Section IV, Power Boilers, of ASME Code.
Steam boilers designed for operating pressures exceeding 15 psig
are constructed in accordance with Section 1, Power Boilers, of the
ASME code. Hot water boilers designed for operating temperatures
above 250°F or 125 psi are likewise built to ASME code.
To Next Page
Loading...