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Steam Distribution Coils


Steam Distribution Coils – Type NS, NO, NOD

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Primary Surface

Round seamless copper tubes are mechanically expanded into the fin collars of the secondary surface. The mechanical expansion provides a permanent metal-to-metal bond for efficient heat transfer. The 5/8 inch O.D. inner steam distributing tubes are centered in the outer condensing tube (1 1/8 inch O.D.). The inner tube has proportionally spaced directional steam jet orifices that direct the condensate flow to the outlet.

Tube Size Options:

1 1/8” o.d. x .035” wall thickness standard with optional wall thickness of (.049). Tubes are centered on 3.0” in the tube face and one row is the only option.

Secondary Surface

Corrugated plate type fin that is die-formed. Fin collars are full-drawn to provide accurate control of fin spacing and maximum contact with tubes.

Fin Material Options:

Aluminum fin thickness of .010” standard. Optional copper fin thickness of (.010). Fins per inch available 6 through 14.


Seamless copper with die-formed holes that provide a parallel surface to the coil tube for strong brazing joints.


Red brass Schedule 40 male pipe thread (MPT) is standard with optional copper female pipe thread (FPT) available. Maximum fin length of 120” with same end connections. Fin length over 120” is recommended to have steam supplied at both ends (Type 9NOD). Any fin height over 48” will have two supplies and two returns.


Using 16 ga. minimum thickness material, 1 ½” flanges are die-formed to permit easy stacking and mounting. Casing is pitched nominal 1/8” per foot to facilitate condensate removal. Intermediate tube supports are supplied on coils over 44” fin length with an additional support every 42”.

Casing Material Options:

Full G-90 galvanized steel standard with optional 304 & 316 stainless steel.

Testing & Performance

All coil assemblies are leak tested under water at 315 PSIG nitrogen. Standard construction is suitable for 50 PSIG steam pressure. Heavier wall construction is available up to 100 PSIG.

PERFORMANCE is CERTIFIED under ARI Standard 410. All coil performance ratings are according to Temtrol’s ARI certified selection software.

(5/8” o.d. outer with 3/8” o.d. inner steam distributing tube) available upon request, consult factory.

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