Steam Coils

Steam Coils are used in both industial and HVAC applications. Finned tubes are almost always used in steam coil applications. A steam coil is used to heat air when steam is available. This type of coil makes use of the latent heat that is realeased by the steam when it condenses so it is a very effective way of heating air.

 

Applications

  • Boiler Air Preheating
  • Pulp Dryers
  • Paper Machine Ventilator Coils
  • Make-up Air Units
  • Air Cooled Heat Exchangers
  • Air Tempering applications
  • Unit Heaters
  • Space Heaters
  • Other Dryer applications
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Coil Types
 

 

Coil Type

 

 

Other Names

 

Description

 

Straight Tube

  • Blast Coil
  • Type S Coil
  • Type MP Coil
  • Straight tubes
  • One or two row
  • One Pass
  • Opposite end connections

 

U-Tube coil

  • Type H Coil
  • Type CH Coil
  • Hairpin Coil
  • Type LRB Coil
  • Two row coil with tubes formed in a U shape
  • Two Pass
  • Same end connections

 

Non-freeze Coil

  • Type DT Coil
  • Type ANF Coil
  • Type BNF Coil
  • Distributor Tube Coil
  • Straight Tubes
  • Inner distributing tube to feed steam
  • One or two row
  • Two Pass
  • Same end connections
  • Incoming steam heats condensate leaving coil to reduce the risk of freezing

 

Flex Coil

  • Uniflex Coil
  • Fexitube Coil
  • Tube have an off-setting bend to allow for thermal expansion
  • One or two Row
  • One Pass
  • Opposite end connections

 

PFR Coil

  • Tandem Coil
  • "Purge First Row" Coil
  • The ultimate in freeze protection - designed for applications with very cold inlet air
  • Two Row
  • Vertical tubes
  • Opposite end conections
 

Click here to see how a Standard Steam coil works

Click here to see how a Non-freeze (Distributor Tube Type) Steam coil works

Construction:

TUBES: Cooper, 90/10 Copper/Nickel, Carbon Steel, Stainless Steel, high alloy steels.

FINS: Aluminum, Copper, Carbon Steel, Stainless Steel, various coatings.

FIN TYPES: Plate Fin, Extruded Fin, Solder Coated, Applied, Weld-on. Click Here for a Comparison of Fin Types

Welded or Brazed tube joints

ASME, CRN, N-Stamped

Click here for information on condensate handling and preventing steam coil failures

For a guide to Steam Coil Nomenclature and Terminology click here

For Information Required to Size or Replace a Steam Coil click here

Steam Air Heaters

A Steam Air Heater (also referred to as Steam Coil Air Heaters) consists of a frame which houses one or more steam coils. The frame is installed in ducting and each steam coil is individually removable from the frame so that they can be cleaned, repaired or replaced without disturbing the ducting. A Steam Air Heater is usually applied in applications where there is a large heat load and multiple steam coils are required to meet the duty. In applications with a large heat load, a bank of several steam coils is often a better solution than one large steam coil because large steam coils are susceptible to performance problems due uneven steam distribution and they are difficult to handle during installation and removal. Any combination of the steam coils listed above can be use in a steam air heater.

Applications:

  • Boiler Air Preheater
  • Recovery Boiler
  • Power Boiler
  • Flue Gas Reheater
  • Dryer
steam air heater.bmp