Specifications

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j. Provisions must be made to close fresh air dampers if steam supply pressure falls below minimum
specified.
1.1 CERTIFICATION
Acceptable coils are to have ARI Standard 410 certification and bear the ARI symbol. Coils exceeding the scope
of the manufacturer's certification and/or the range of ARI's standard rating conditions will be considered provided
the manufacturer is a current member of the ARI Air-Cooling and Air-Heating Coils certification program and the
coils have been rated in accordance to ARI Standard 410. Manufacturer must be ISO 9002 certified.
1.2 STEAM COIL DESIGN PRESSURES AND TEMPERATURES
Coils shall be designed to withstand 50 psi maximum operating pressures and a maximum steam temperature of
300°F for standard duty copper tube and header coils. Mid pressure coils (50-200 psi) shall be designed with
copper tubes and cupronickel headers to withstand 400 degrees. Optional high pressure construction will include
cupronickel tubes and headers to increase maximum operating pressure to 350 psi and maximum operating
temperature to 450 degrees. Maximum temperatures and pressure can be obtained utilizing an all carbon steel or
stainless steel construction. Please call the factory for these applications.
1.3 FACTORY TESTING REQUIREMENTS
Coils shall be submerged in water and tested with a minimum of 315 psi air pressure for standard copper tube
coils. A 500 psig hydrostatic and shock test is required for high pressure cupronickel construction. Coils must
display a tag with the inspector's identification as proof of testing.
1.4 FINS
Coils shall be of plate fin type construction providing uniform support for all coil tubes. Stainless steel fins shall be
constructed of 304 & 316 stainless. Carbon steel fins shall be constructed of ASTM A109-83. Coils are to be
manufactured with die-formed aluminum, copper, stainless steel or carbon steel fins with self-spacing collars,
which completely cover the entire tube surface. The fin thickness shall be 0.0075 +/- 5% unless otherwise
specified. Manufacturer must be capable of providing self-spacing die-formed fins 4 through 14 fins/inch with a
tolerance of +/- 4%.
1.5 TUBING
Tubing and return bends shall be constructed from UNS 12200 seamless copper conforming to ASTM B75 and
ASTM B251 for standard pressure applications. High pressure construction shall use seamless 90/10 Cupronickel
Alloy C70600 per ASTM B111. Stainless steel tubes shall be ASTM A249. Carbon steel tubes shall be W&D -
ASTM A214 & seamless - ASTM A179. Copper tube temper shall be light annealed with a maximum grain size of
0.040 mm and a maximum hardness of Rockwell 65 on the 15T scale. Tubes are to be mechanically expanded to
form an interference fit with the fin collars. Tubes shall have a nominal thickness of 0.020 inch unless otherwise
specified.
1.6 FREE FLOATING CORE
Coils to utilize free floating core assembly to allow for thermal expansion and contraction of tubes during coil
operation.
1.7 CLEANING
Prior to brazing, residual manufacturing oils and solid contaminants shall be removed internally and externally by
completely submersing the coil in a degreaser, which is chemically compatible with the coil material.
1.8 HEADERS
Headers shall be constructed from UNS 12200 seamless copper conforming to ASTM B75 and ASTM B251 for
standard pressure applications. High-pressure construction is to incorporate seamless 90/10 Cupronickel Alloy
C70600 per ASTM B111. Stainless steel will be constructed of 304L & 316L (ASTMA312) Sch-5 or Sch-10.
Carbon steel headers shall be constructed from Sch-10 (ASTM-A135A) or Sch-40 (ASTM A53A) pipe.
Steam coil return headers are to be equipped with factory-installed 1/2” fpt air vent connection placed at the
highest point available on face of the header. Tube-to-header holes are to be intruded inward such that the landed
surface area is three times the core tube thickness to provide enhanced header to tube joint integrity. All core
tubes shall evenly extend within the inside diameter of the header no more than 0.12 inch. End caps shall be die-
formed and installed on the inside diameter of the header such that the landed surface area is three times the
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