Custom Steam Distribution Coils

Model DO – Distributing Steam with Opposite End Connections

Like the other steam coils, distributing steam heating coils are used in a variety of industrial ventilation and process drying applications across almost every industry. As a general rule, coils in this series are selected when the incoming air temperatures are below 40°F and/or the steam supply is modulated for temperature control. Model DO coils can be either 1-or-2-row with connections on opposite ends.

The Distributing Steam coil is often referred to as a ‘no-freeze’ coil. The design features an inner tube, inside the primary tube, that serves two purposes. First, it distributes the steam to the far end of the primary tube where the steam returns and/or condenses in the annular area between the tubes. The second features is that the warm inner tube acts as a heat-trace to keep the condensate in the primary (outer) tube from freezing.

Steam Coil Case Types & Materials

Advanced Coil Model S Steam Coil case types include standard, baffled, air tight, slide-out, and pitched.
We also work with the following materials:

Fin Materials	Tube Materials	Case Materials
0.025” or 0.016” thick half-hard temper aluminum	7/8” x 0.049” wall 304L or 316L stainless steel	16ga. to 1/4” 304L or 316L stainless steel
0.025” or 0.016” thick half-hard temper copper	7/8” x 0.083” wall 304L or 316L stainless steel	16ga. to 7ga. galvanized steel
0.010” thick 304 or 316 stainless steel	7/8” x 0.109” wall steel	Other materials upon request
0.012” thick carbon steel

Typical Application Reference Chart

Typical Application	Tube Material	Tube Designation	Header Material	Typical Design Pressure @ Temperature*
High pressure, non-corrosive steam	0.109” wall (12 ga.) Steel	S09 Welded 309 Seamless	Sch 40 Carbon Steel	250 PSIG @ 450°F
Corrosive steam or corrosive atmosphere	0.049” wall (18 ga.) 304LSS	449 Welded 549 Seamless	Sch 40 304LSS	250 PSIG @ 450°F
Corrosive steam or corrosive atmosphere	0.049” wall (18 ga.) 316LSS	649 Welded 749 Seamless	Sch 40 316LSS	250 PSIG @ 450°F
High-pressure, corrosive steam or corrosive atmosphere	0.083” wall (14 ga.) 304LSS	483 Welded 583 Seamless	Sch 40 304LSS	250 PSIG @ 450°F
High-pressure, corrosive steam or corrosive atmosphere	0.083” wall (14 ga.) 316LSS	683 Welded 783 Seamless	Sch 40 316LSS	250 PSIG @ 450°F

*Higher pressures and/or temperatures are available to meet the specific project requirements

Distributing Steam Coil Applications

Advanced Coil manufactures custom distributing steam coils for a variety of applications & Industries including:

Grain/seed processing facilities and equipment
Pulp/paper processing facilities and equipment
Dairy processing facilities and equipment
Food processing facilities and equipment
Power plants
Heat recovery systems
Petroleum/chemical plants
Textile factories

Type DO coils are available as both one-row and two-row deep coils with the steam feed connection and the condensate return connection on opposite ends of the coil.