Industrial Package Watertube Boiler
"D" Type / "DR" Design
 

The  "D" type "DR" design watertube boiler has allowed English Boiler to offer attractive pricing programs without sacrificing quality construction, efficiency, guaranteed emissions, and on time delivery.

The "DR" design boiler is made up of five major components.  The components are the Structural Steel Base and Lower Water Drum, the Front Wall, the Rear Wall, and the Upper Steam Drum.  These components provide the structural integrity of the boiler.  Each component is designed to expand independent of the other components. The membrane wall tubes in conjunction with the corner expansion joints allow for the independent expansion.  Regardless of its capacity, each boiler is constructed in much the same manner.

This concept allows English Boiler to custom design each and every unit without incurring extra engineering charges.  Any boiler can be changed in height, width, and length without penalizing the customer.  Each English boiler is designed to meet and exceed the customer requirements.  English boilers usually have more heating surface for the same size and capacity than that provided by other boiler manufacturers.

The English "DR" boiler is designed around the premise that the maximum heat release in the furnace should not exceed 85,000 (Btu/Hr/CuFt).  At the same time the maximum exit gas temperature (before the economizer) should not exceed 200°F above the saturation temperature of the steam at the corresponding operating pressure. 

English Boiler believes that refractory lined furnace walls are superior to thermal ceramic insulation blocks typically used by other boiler manufacturers in front and rear wall construction.  Refractory lined walls provide structural integrity and should be specified in lieu of ceramic insulation walls, which are more likely to fail due to separation between the ceramic blocks.  All English boilers with lower drums greater than 24" O.D. are constructed with water-cooled front and rear membrane walls.  English Boiler offers a guarantee on water-cooled, refractory lined front and rear walls.