CleaverBrooks CBLE, Operation And Maintenance Manual

Page: 18 / 194

Basics of Firetube Operation
1-4 750-91 (revised 2009)
Model CB-LE Packaged Boiler Manual
ness 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 relieving 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.
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 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 accumulations is described in Chapter 3.
The operator should be familiar with Chapter 3 before attempting to place the unit into operation.
1.3 — Construction
Steam boilers designed for 15 psig and hot water boilers designed for 250º 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 250º F or 125 psi
are likewise built to ASME Code Section 1.
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 equip-
ment damage.
! Caution