Secondary surface (fins) are of the plate-fin design using aluminum or copper, with die-formed collars. The fin design is to be flat, waffle, or sine-wave in a staggered tube pattern to meet performance requirements.
Collars will hold fin spacing at a specified density and cover the entire tube surface. Aluminum properties are to be alloy 1100 per ASTM B209, with 0 (soft) temper; copper is to be alloy 11000 per ASTM B125-06 with soft (anneal) temper. Fins are to be free of oils and oxidation.
Coil casing material shall be of G90 galvanized steel, 16 gauge minimum. Heavier material, stainless steel, copper, or aluminum casings are to be provided as required. All tube sheet holes are to be oversized to allow for free thermal expansion and contraction of tubes during operation. Intermediate tube supports are to be provided on all coils 50” and longer in fin length. Coil casings on the top and bottom of coils are to have double-flanged construction, allowing for vertical stacking of coils.
Tubes and return bends are to be constructed from seamless UNS C12200 copper conforming to ASTM B75 and ASTM B743. Properties shall be O50 light annealed, with a maximum grain size of 0.040mm. Seamless tubes are to be mechanically expanded into plate fins to form an everlasting bond between primary and secondary surfaces.
Coils shall be tested at 550 PSIG using dry nitrogen, submerged underwater. Dual-operator verification shall determine that all coils are leak-free
| Fin Material | Aluminum | Optional - Copper; Stainless Steel |
| Casing Material | Galv. Steel 16 gauge | Optional - Galv. Steel 12, 14, 16 and 18 gauge • 304, 316 Stainless Steel 12, 14 and16 gauge • 14 gauge Aluminum |
| Connection Material | Copper | Optional - Steel • Red Brass |
| Tube Material | Copper | Optional - Stainless Steel • Cupro Nickel • Carbon Steel |
| Header Material | Copper | Optional - SS Tube will have SS HDR(s) • Cupro Nickel Tubes will have Cupro Nickel HDR(s) • Carbon Steel Tubes will have Carbon Steel HDR(s) • Type K copper |
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