Longda has a complete set of manufacturing and testing equipments ,which are the most Advanced in the technical tube industry .Meanwhile ,we have established an effective quality management system with strong execution. We manufacture and control the products in accordance with ASTM (American Society of Testing Materials) & ASME(American Society of Mechanical Engineers) standards. 1.Copper & Copper Alloys Tube ASTM B75 ,ASTM B111,ASTM B359,ASME SB75,ASME SB111,ASME SB359 Chinese Standard :JB/T 10503, GB/T 19447 ,GB/T 17791,GB/T1527,GB/T 8890 DIN EN12451,DIN EN12449, EN12452, EN10204 2.Carbon Steel Tube ASTM A179 ,ASME SA179 ,ASTM A498 3.Stainless Steel Tube :ASTM A213 ,ASTM A268 ,ASTM A803 4.Titanium & Titanium Alloy Tube :ASTM B338, ASTMB861,ASME SB338 ,ASME SB861, GB/T 3624, GB/T 3625, EN17861 Fin Tube Material Fin Tube Material China GB ISO EN UNS JIS Copper TP2 Cu-DHP CW024A C12200 C1220 Copper TP1 Cu-DLP CW023A C12000 C1201 Copper Nickel 95/5 B5 - - C70400 - Copper Nickel 90/10 BFe10-1-1 CuNi10Fe1Mn CW352H C70600 C7060 Range of Available Dimensions Product Category Finned Dimensions Absorption Chiller Fin Tube C12200, C12000 C70600, C70400 Finished  Fin OD (mm) WT (mm) FPI Norminal Wall under Fin (mm) Ridge No. (n) Helix Angle (°) Ridge  Height (mm) Fin Height (mm) ☆ ☆ 16 0.65 26 ≥0.45 8 43° ≥0.125 0.30 ☆ ☆ 16 0.60 26 ≥0.45 - - - 0.30 ☆ ☆ 16 0.70 26 ≥0.45 - - - 0.30 ☆ ☆ 19 0.60 26 ≥0.43 - - - 0.30 ☆ ☆ 19 0.65 26 ≥0.45 - - - 0.30 Application & Advantage Absorption Chiller Fin Tube The trend for absorption water chillers is toward higher efficiency and less footprint area.Nowadays,with the development of advanced technology,the lithium bromide absorption chillers have only 1/3 of the volume and 1/2 Of the weight than they were in previous designs.Meanwhile,the heat transfer performance has increased more Than 1/3 .This can be attributed to the application of the new technical tubes with improved thermal performance. We have developed a series of fin tubes with upgraded heat transfer performance specialized for different heat exchanger components of absorption chillers.This kind of tubes are designed and improved to optimize the absorber,evaporator,condenser ,etc ,due to their perfect surface hydrophilicity , outstanding heat transfer performance as well as supper light weight.