fin tubes ( finned tubes )'s fin type: L fin tubes, LL(DL) fin tubes, KL fin tubes (knurled finned tubes) (with aluminum fins)
(Techfin Type: L fin tubes, LL(DL) fin tubes, KL fin tubes (knurled finned tubes)
Core Tubes
Carbon steels (ASTM A **9/ A **4, St *5.8,etc.), low-alloy steels, stainless steels, copper-nickel alloys, aluminum bronze, copper, nickel-alloys(Alloy **0, ext.), bimetal

Fins: Aluminum ASTM B**9 Al ***0; ASTM B**9 Al ***0, ***0A.

FIELDS OF APPLICATION
. the petroleum, chemical and petrochemical process industries
. natural gas treatment
. the steel industry: blast furnace and converter systems
. power generation: steam turbine exhaust condensing
- contact condensing with cooling of circulating condensate
- fossil and nuclear power plants
. air conditioning (Freon, ammonia, propane)
. incineration of household refuse
. compressor coolers, etc.

MANUFACTURING PROCESS
The manufacturing strip is folded to from an L shape and then wound around the base tubes (pipes) (core tube). The feet of the fins are joined together and cover the whole of the finned surface. Both lends are clamped down to avoid unrolling through damage.

ADVANTAGES
Economic This method of manufacturing enables us to place the finning on a very thin-walled tubes (pipes) with is particularly desirable when using noble alloys(titanium, stainless, copper, nickel).
The tubes (pipes) can withstand a temperature of up to **0°C without the risk of atmospheric corrosion or thermal stress.L1 max. = *2 **0 mm Fin Thickness = 0,3 - 0,4 mm Fa = Outer tubes (pipes) Surface Area incl. Surface Area of FinsL2 max. = L1 *2t x = acc. to clients specification Fi = Interior tubes (pipes) Surface Area per Meter (m2/m)FZR = Uncovered tubes (pipes) Area between the fins

Increased contact surface and improved lock of the fin base in the axial surface of the tube. Improved fin bond stability at higher temperatures. More stable during application process than Wrap-On Fin.
general used materials:
Supply Range of base tubes (pipes) (core tube):

Carbon Steel ASTM A **9, ASTM A **2, ASTM A **0 Gr. A1, ASTM A **0 Gr. C, ASTM A **6 Gr. B
Low Alloy Steel ASTM A **9 T1, ASTM A **3 / A **9 T*1/T*2, ASTM A **3 / A **9 T*2, ASTM A **3 / A **9 T5, ASTM A **3 / A **9 T9, ASTM A **5 P1 / A **1 T1, ASTM A **5 P*1 / P*2 / A **0 T*2, ASTM A **5 P*2 / A **0 T*2, ASTM A **5 P5 / A **0 T5, ASTM A **5 P9 / A **0 T9
Stainless Steel ASTM A **3 / A **2 TP **4l, ASTM A **3 / A **2 TP **4L, ASTM A **3 / A **2 TP **1, ASTM A **3 / A **2 TP **6, ASTM A **3 / A **2 TP **6L, ASTM A **3 / A **2 TP **7, ASTM A **3 / A **2 TP **6Ti, ASTM A **9 / A **0 UNS S ****3, ASTM B **7 Alloy **4L
Nickel ASTM B **1 Ni **0, ASTM B **1 Ni **1