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 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 Pool Boiling Evaporator Tube & FallingFilm Evaporator Tube C12200, C12000 C44300, C68700 C70600, C71500 A179 OD (mm) End WT (mm) Finished Fin OD (mm) Norminal Wall under Fin (mm) Fin Height (mm) FPI ☆ ☆ ☆ 16 1.0 15.80 0.58 0.80 50 ☆ ☆ ☆ 16 1.05 15.85 0.60 0.80 50 ☆ ☆ ☆ 16 1.15 15.85 0.65 0.85 50 ☆ ☆ ☆ 19 1.0 18.90 0.60 0.80 50 ☆ ☆ ☆ 19 1.06 18.90 063 0.85 50 ☆ ☆ ☆ 19 1.1 18.90 0.65 0.90 50 ☆ ☆ ☆ 19 1.2 18.90 0.72 0.90 50 ☆ ☆ ☆ 25.4 1.15 25.30 0.65 0.90 50 ☆ ☆ ☆ ☆ 16 1.2 15.85 0.75 0.80 50 ☆ ☆ ☆ ☆ 19 1.2 18.85 0.75 0.85 50 ☆ ☆ ☆ ☆ 16 1.2 15.85 0.78 0.80 50 ☆ ☆ ☆ ☆ 19 1.2 18.90 0.78 0.80 50 Product Category Finned Dimensions (Continue) Pool Boiling Evaporator Tube & FallingFilm Evaporator Tube Nominal Outside Surface Area( m2/m) Actual Outside Surface Area( m2/m) Ridge Number Norminal Ridge Height Nominal Inside Surface Area(m2/m) Actual Inside Surface Area( m2/m) 0.050 0.23 20 0.30 0.044 0.048 0.050 0.23 20 0.30 0.043 0.048 0.050 0.235 20 0.35 0.040 0.048 0.060 0.278 24 0.30 0.053 0.064 0.060 0.278 24 0.30 0.053 0.070 0.060 0.28 34 0.35 0.052 0.072 0.060 0.28 38 0.35 0.052 0.075 0.080 0.39 54 0.35 0.072 0.116 0.050 0.23 20 0.30 0.040 0.0478 0.060 0.275 34 0.30 0.052 0.072 0.050 0.23 20 0.30 0.040 0.0478 0.060 0.275 38 0.30 0.052 0.072 Application & Advantage High Performance Evaporating Tube High performance evaporating tubes are designed for flooded and falling film evaporators of chillers in air conditioning and refrigeration industry .Other clean service flooded evaporators duch as boiling of light hydrocarbons can also benefit from the enhanced performance of these technical tubes. The fish scales like profiles are distributed uniformly on the enhanced surface of the tube while the circular channels are formed helically under the profiles.The special Porous structure has provided lots of nucleation points which are critical in flooded boiling .It has reduced the thickness of the liquid film between the bubbles and the tube wall to decrease the thermal resistance . Meanwhile,it can accelerate the circulation of liquid and bubbles in the fin root channels and cavity pockets due to the thermo-siphon effect,which improves both internal and external convection.This circulation can also help to remove impurities to reduce fouling.In this special configuration ,refrigerant can boil more bubbles continuously At less superheat .The shell transfer coefficient can be as high as 30 times that of a plain tube . Furthermore ,the tube side heat transfer coefficient is again improved contributing To increased surface area and turbulent fllow induced by helical ridges inside the tube. Besides the applications in chiller industry,high performance evaporator fin tubes can also be found applied in any field where nucleate boiling needs to be driven by very small  temperature difference in heat transfer such as the separation of light Hydrocarbons,geothermal engineering,ocean thermal power generation ,waste heat recovery and in evaporation of the aqueous solution at low temperature etc. In the falling film evaporator application ,the high performance evaporating tube helps not only to reduce the refrigerant charge more than 1/3 ,but also improves the chiller performance to enable its stable operation.