Boiler:
Four-pass full wetback firetube type, constructed in accordance with requirements of the ASME Code, Section IV for 30 PSI and 125 PSI water or 15 PSI steam; Section I for higher-pressure steam. All units are registered with the National Board.
Turbulator baffles are not used in tubes. Separate rear tube sheets allow safe expansion and contraction.
Waterbacked rear turnaround promotes rapid internal circulation and reduces gas temperatures at the entrance to the second pass, reducing tube end stress.
Easy opening hinged, insulated front flue doors with light weight non-refractory closure provide full access to all tubes. A light weight 16-inch diameter bolted rear access door with observation port provides access to the boiler furnace. Rear tube access is provided by removing lightweight gasketed doors(s) installed on the rear smokebox. No elaborate seals are used.
A manhole is furnished as standard. Handhole washouts are provided for easy inspection and cleaning of waterside surfaces. All steam boilers are provided with a dry pan to ensure dry steam. A feedwater diffuser is provided on high-pressure boilers. All water boilers are equipped with a dip tube at supply outlet and diffuser at return inlet.
The round-flanged vertical smoke outlet is equipped with an aluminized quadrant damper. All boilers are provided with an enameled steel jacket installed over 2 inches of fiberglass insulation and lifting lugs.
The boiler is mounted on a heavy-duty structural steel base with extended skid and burner platform for protection of the burner during shipment and rigging.
Standard Trim and Controls:
Steam: 157 pump control/low water cut-off with alarm contacts- piped with quick opening blowoff valve. Gauge glass set with hand-operated gauge and try cocks. Steam pressure gauge-4-1/2-inch dial on sizes 125 HP and smaller, 6-inch dial on larger sizes. L404A operating pressuretrol, L404C manual reset high limit pressuretrol and appropriate firing rate control when required. Manual reset probe auxiliary low water cut-off.
ASME side outlet safety valve(s).
Water:
63M manual reset low water cut-off with 30 PSI units, 150M low water cut-off with higher-pressure units-piped with quick opening blowoff valve. Combination pressure/temperature gauge-3 ½ inch dial on 125 HP and smaller. On larger sizes a 6- inch combination pressure/altitude gauge and 5-inch dial temperature gauge. L4006A operating aquastat and L4006E manual reset high limit aquastat and appropriate firing rate control when required.
ASME side outlet relief valve(s).
Burner Equipment:
Burner mounts directly to front head boiler with no elaborate seals. Factory packaged units available with forced draft burners for all commonly used fuels-gas, all grades of oil-No. 2 through No. 6-a combination gas/oil. Choice of pressure or air atomizing burners for No. 2 oil-air-atomizing burners for No. 2 oil-air atomizing on heavy oil. Gas burners are available for either natural or LP gas.
Refer to burner data sheets for standard burner equipment and operating sequence.
Accessories and optional equipment available at extra cost, including, but not limited to:
- Alternate or additional water level controls or low water cut-offs
- Built-in tankless heater coils-low-pressure boilers only
- Motorized or pneumatic feed valves
- Surface skimmers and blowoff valves
- Bottom blowdown valves and drain valves
- Feed stop and check valves
- Sequence draft controls
- Lead/lag sequencing systems
- Boiler Feed systems
- Low NOx burners
- Deaerators
- Water Softeners
- Chemical Feed systems
- Blowdown systems
- Sample Coolers