Industrial Steam Distributing Coils

Model DS – Distributing Steam with Same End Connections

Steam distributing coils, also known as ‘non-freeze coils’, are custom designed coils used to prevent freezing of steam condensate for coils that are used as preheaters for extreme temperatures. Most commonly, non-freeze coils are used in applications that may
see freezing air temperatures and/or with modulating steam pressure. These coils are usually recommended for entering air temperatures below 40°F. Model DS coild can be either 1-or-2-row with connections on the same end.

Steam Distribution Coil Design

These coils feature an inner tube inside the primary tube for two reasons. The inner tube distributes the steam to the far end of the primary tube where the steam returns and condensed in the annular area between the tubes, and the inner tube also acts as a heat-trace to keep the primary tube from freezing. Advanced Coil custom designs steam distributing coils with TIG welded tube side construction, and ASME ‘U’ stamp or CRN construction available upon request. Type DS coils are available as both one-row and two-row deep coils with the steam feed connection and the condensate return connection on the same end.

Advanced Coil manufactures steam distributing coils in the following materials:
Other materials available upon request.

Non-Freeze Coil Material Types

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