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 Materials Fin Tube Material China GB ISO EN UNS JIS Copper TP2 Cu-DHP CW024A C12200 C1220 Copper TP1 Cu-DLP CW023A C12000 C1201 Admiralty Brass HSn70-1 CuZn28Sn1As CW706R C44300 C4430 Aluminum Brass HAl77-2 CuZn20Al2As CW702R C68700 C6870 Copper Nickel 90/10 BFe10-1-1 CuNi10Fe1Mn CW352H C70600 C7060 Copper Nickel 90/30 BFe30-1-1 CuNi30Mn1Fe CW354H C71500 C7150 Carbon Steel Tube 10 - E215 A179 STB340 Stainless Steel 06Cr19Ni10 - X5CrNi18-10 304 SUS304 Stainless Steel 06Cr17Ni12Mo2 - X5CrNiMo17-12-2 316 SUS316 Titanium Alloy TA1 - TI1 GR1 - Titanium Alloy TA2 - TI2 GR2 - Range of Available Dimensions Product Category Material Plain End Finned Dimensions Inner Grooved Tube C12200, C12000 C44300, C68700 C70600, C71500 A179 OD (mm) End WT (mm) Norminal Wall under Fin (mm) Ridge Number (n) Ridge  Height (mm) ☆ ☆ ☆ 12.0 0.70 0.55 75 0.25 ☆ ☆ ☆ 12.7 0.70 0.55 75 0.25 ☆ ☆ ☆ 12.7 1.0 0.71 50 0.50 ☆ ☆ ☆ 16 0.75 0.55 75 0.30 ☆ ☆ ☆ 16 0.80 0.60 75 0.30 ☆ ☆ ☆ 16 0.90 0.70 75 0.30 ☆ ☆ ☆ 16 1.0 0.75 50 0.50 ☆ ☆ ☆ 16 1.0 0.80 75 0.30 ☆ ☆ ☆ 12.7 1.0 0.81 60 0.20 ☆ ☆ ☆ 16 0.75 0.55 75 0.30 Product Category Finned Dimensions (Continue) Inner Grooved Tube Helix Angle ( °) Nominal Inside Surface Area( m2/m) Actual Inside Surface Area( m2/m) 18 0.034 0.060 18 0.036 0.061 2 0.035 0.063 23 0.047 0.080 23 0.046 0.078 23 0.046 0.074 2 0.046 0.078 23 0.045 0.080 18 0.035 0.051 23 0.047 0.080 Application & Advantage Inner Grooved Tube /Direct Expansion Heat Exchanger Tube It is a type of inner gooved copper tube in straight length ,is designed for direct expansion shell & tube evaporators or condensers .Inner Ridges of the tubes are optimized by testing and statistical research work to acquire the best heat transfer performance ,while still keeping reasonable inernal pressure drop.