Types and Sizes of Copper Tubing HCC （类型和大小的铜管肝癌）.pdf

Types and Sizes of Copper Tubing • Soft or hard drawn tubing • “K” pipe is heavy duty • “L” pipe is standard weight • “M” and “DWV” are lighter weight piping • ACR Tubing measured by outside diameter • Nominal tubing is measured by inside diameter ACR and NOMINAL TUBING IDENTIFICATION ACR TUBING NOMINAL TUBING 7/8” 3/4” Both pipes are physically the same size, but are identified differently depending on the application Tubing Insulation • Insulating piping material prevents heat transfer between the fluid in the pipe and the surrounding air • Reduces the formation of condensate on cold lines such as cold water lines or the suction line on an air conditioning system • Increases the efficiency of hydronic heating systems by keeping the heat in the pipes • Closed cell insulation is desired Cutting Tubing • Tubing can be cut with a hacksaw or tubing cutter – Tubing cutters for refrigeration lines and smaller tubing – Hacksaws for larger diameter piping material • Remove burrs from tubing after cutting • All cuts must be perfectly straight 1. Mark the tubing at the 5. Tighten the wheel on desired cut point the cutter 2. Position the tubing on 6. Continue rotating the rollers and tightening the knob until the tubing is cut 3. Tighten the knob on the cutter until the cutting wheel comes in