Model 4
1500 - 6000 MBTU/hr
Rev. 03-08
Section B2-30
5.
Observation ports shall be provided at each end of the boiler for
visual inspection of the pilot and main flame conditions.
6.
Two lifting eyes shall be located on top of the boiler.
7.
The exhaust gases shall vent at the rear of the boiler, on the top
centerline.
D. Trim
1.
The water column shall be located on the left side of the boiler.
It shall be piped with unions for easy removal.
2.
A gauge glass set, gauge glass blowdown valve, and water
column blowdown valve shall be provided.
3.
The boiler feedwater control switch shall be included as an
integral item of the water column. It shall provide automatic
actuation of a motor driven feedwater pump or valve to
maintain the boiler water level within normal limits.
4.
The primary low water cutoff switch shall be an integral part of
the water column. It shall be wired into the burner control
circuit preventing burner operation if the boiler water level falls
below the designated safe level.
5.
A steam pressure gauge shall be located at the front end of the
boiler and shall include a cock and test connection.
6.
A safety relief valve shall be provided of a size and type to
comply with ASME Code requirements. The safety relief valve
set pressure shall be
psig.
7.
A high limit pressure control shall be provided. It shall be a
manual reset type and shall be wired to prevent burner
operation and lockout if excessive steam pressure occurs.
8.
An operating limit control shall be provided. It shall be wired to
provided on– off control of the burner at operating set points.
9.
A firing rate control shall be provided. It shall control the firing
rate of the burner based on the boiler load.
10. An auxiliary low water cutoff shall be provided (manual reset
type). It shall be wired into the burner control circuit preventing
burner operation if the boiler water level falls below the
designated safe level.
11. A stack thermometer shall be shipped loose for field
installation.
E.
Soot Cleaning
1.
Soot washer lances shall be provided in the convection area of
the boiler measuring the full length of the pressure vessel.
2.
Each lance shall be provided with a shutoff valve and the
assembly shall be capable of rotating 360 degrees. This shall
ensure complete washing of the convection zone while the
boiler is operating in the low fire mode.
3.
Soot washer troughs shall be provided at the bottom of the
boiler. These shall be furnished for each convection side and
shall The soot washer troughs shall be provided with 2" drain
connections at the rear of the boiler, and shall have inspection/
cleanout openings at the front of the boiler.
