... -friendly,energy-saving 3.Work Pressure:0.2~3.1MPa 4.Fin space:1.2~3.5mm 5.Tube Diameter:7, 7.94, Item ... Heat Exchanger TypeOperation mediumOperation pressure(MPa)Application1Φ16/Φ9.52/Φ12.7Copper tube ... products as per customized samples or drawing.14.producing procedure: tube bending, punching fin, expanding, digressing, dryingWelding, leakage test, bending, ...