Program 03Heat Transfer
Finned and bare tubes, U-tubes, high-frequency welded tubes and hairpin exchangers for refineries, petrochemical plants, condensers and power generation.
5
Fin constructions
18 500 mm
Maximum tube length
5/8″–2″
Tube outside diameter
Ti · Ni
Up to titanium and nickel alloy
Fin tubesFive constructions, chosen by service
The fin type is a corrosion and temperature decision before it is a heat transfer one. Aluminium 1060 / 1100 or copper fin on carbon steel, stainless, nickel alloy or titanium tube; extruded fin uses AL 1060 / 6060 / 6063.
| Fin type | Construction | Tube OD | Fin th'k | Fin height | FPI |
|---|---|---|---|---|---|
| ‘G’ embedded | Strip wound into a machined groove and locked by back filling with base tube material — holds performance at high tube metal temperature. | 1″ – 2″ | 0.35 – 0.5 mm | 9.5 – 22 mm | 8 – 12 |
| ‘L’ footed | Strip tensioned for optimum contact pressure at the fin foot; the foot also protects the base tube. | 5/8″ – 2″ | 0.35 – 0.7 mm | 8 – 22 mm | 7 – 11 |
| ‘LL’ overlapped | Fin foot overlapped to enclose the base tube completely — alternative to extruded fin in corrosive environments. | 3/4″ – 2″ | 0.35 – 0.5 mm | 8 – 22 mm | 7 – 11 |
| ‘KL’ knurled | Base tube knurled before the foot is applied and knurled into it, improving bond and heat transfer. | 3/4″ – 2″ | 0.35 – 0.5 mm | 8 – 22 mm | 7 – 11 |
| Extruded | Bi-metallic tube with the fin rolled out of the outer aluminium tube: integral fin, excellent corrosion protection. | 1″ – 1½″ | 0.4 mm | ≈ 15.9 mm | 7 – 11 |
Also suppliedTubes, bundles and exchangers
- Bare tubes
- Seamless and welded tube in the stocked grades, cut to length and end-prepared.
- U-tubes
- Cold bent U-tubes for exchanger bundles, with bend radius and ovality controlled and heat treatment where the grade requires it.
- HF welded tubes
- Longitudinally welded finned and bare tube for economical bundles in non-critical service.
- Hairpin exchangers
- Double-pipe and multitube hairpin units for high pressure, high temperature difference and fouling service.
- Machine shop
- Tube sheets, baffles, headers and spare bundles machined and assembled to the exchanger drawing.
MaterialsStocked grades
| Standard | Material | Typical service |
|---|---|---|
| ASTM A498 | Carbon and carbon alloy | Refinery and petrochemical exchangers |
| ASTM A1012 | Stainless and duplex | Condensers, petrochemical and power |
| ASTM B359 / SB359 | Copper and copper alloy | Condensers and evaporators, power plants |
| ASTM B891 | Titanium and titanium alloy | Steam and nuclear power condensers |
| ASTM B924 | Nickel alloy | Chemical plant condensers and exchangers |