The D-type watertube boilers represent one of the most popular boiler configurations for watertube boilers and this design is offered by a lot of industrial boiler manufacturers around the world.
The thermodesign D-type models will very in capacities from 10,000Lbr/hr(4.5tons/hr) to 200,000lbs/hr (90tons/hr)with design pressure from 200psig (14bars)to 700psig(48bars). Convective type super heaters are possible with temperatures up to 600F (315C).It is a good design to fire no.6 oil, no.2 oil or gas. Right hand and left hand models are available. For Higher pressures than 700psig (48bars) it is preferable to use an A-type or an O-type boiler.
Typical clients will be pulp and paper industries, petrochemical industries, military bases, large institutional clients etc…This type of boiler is often specified by consulting engineers although it is not symmetrical and well balanced as an A-type or an O-type boiler but it is an old design which has proven itself as being reliable. There are thousands of them in operation around the world mostly for saturated steam and capacities below100, 000lbs/hr (45tons/hr).
The thermodesign D-type boilers can be built using tangent tube waterwalls or membrane type waterwalls.D-type boilers can not be operated at pressure bellow 75psig (5bar) compare to Aquatube boilers and can not be used or are not recommended as hot water heaters. Thermal fluid heating is not possible. Small sizes are very expensive compare to the Thermodesign Aquatube boiler series.

Capacities: From 10,000lbs/hr (4.5 tons/hr) to 200,000 lbs/hr
(91tons/hr) right or left hand models are available.

Pressures: 250psig (17 bars) design up to 750psig (50bars)

Super Heater: Available upon request

Fuels:Oil, gas or combination

-Membrane or tangent tube wall construction to ASME code section I
-Optional water cooled membrane rear wall
-Optional water cooled membrane front wall and burner throat
-Steam purity up to 1ppm

Dtype Watertube Boiler:

Physical Data "D" Type Watertube Boiler:
 

Side Elevation	Front View