Boiler:
Three pass full wetback, packaged firetube type, constructed in accordance with requirements of the ASME Code, Section IV for water or 15 psi steam; Section I for higher pressure steam. All units are registered with the National Board.
Boiler tubes are expanded and flared in low pressure boilers; expanded and beaded in high pressure boilers. Turbulator baffles are not used in tubes. Separate second and third pass rear tube sheets allow safe expansion and contraction.
Waterbacked rear turnaround promotes rapid internal circulation and reduces gas temperatures at entrance to second pass, reducing tube end stress.
Easy opening hinged, insulated front flue doors with bolted closure provide full access to all tubes. A 16-inch diameter bolted rear access door with observation port provides access to the boiler furnace. Rear tube access is provided by removing light weight gasketed door(s) installed on the rear smokebox. No elaborate seals are used.
A manhole is furnished as standard on larger water and steam boilers.
Handhole washouts are provided for easy inspection and cleaning of waterside surfaces.
All steam boilers provided with a dry pan to insure 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 a locking quadrant damper. All boilers are provided with an enameled steel jacket over 2 inches of fiberglass insulation, and lifting lugs. A flue cleaning brush is supplied.
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-4½ inch dial (6 inch on larger sizes), L404A operating pressuretrol, L404C manual reset high limit pressuretrol. ASME side outlet safety valve(s).
Water:
63M manual reset low water cutoff with 30 psi units, 150 low water cutoff with higher pressure units-piped with quick opening blowoff valve. Combination pressure/temperature gauge-3½ inch dial (6 inch on larger sizes), combination pressure/altitude gauge and/or a 5 inch dial temperature gauge. L4006A operating aquastat and L4006E manual reset high limit aquastat. ASME side outlet relief valve(s).
Burner Equipment:
Burner mounts directly to front head of 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 - and combination gas/oil. Choice of pressure or 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:
Accessories and optional equipment available at extra cost, including, but not limited to:
- Solid-state annunciators.
- 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.