@repipe1955 Connecting and soldering copper pipes to PVC pipes for sprinkler lines during a repipe process involves specific steps to ensure a secure and leak-free connection. Here's a step-by-step guide:

Materials Needed:

Copper pipes and fittings
PVC pipes and fittings
Transition fittings (copper to PVC)
Pipe cutter or hacksaw
Pipe deburring tool or sandpaper
Copper pipe flux
Lead-free solder
Propane torch
Emery cloth or abrasive cleaning pad
Pipe hangers and supports
Steps:

Plan and Measure: Determine the layout of your sprinkler lines and measure the required lengths of copper and PVC pipes.

Cut and Prepare the Pipes: Use a pipe cutter or hacksaw to make clean, square cuts on the copper and PVC pipes. Remove any burrs or rough edges from the cut ends using a deburring tool or sandpaper.

Clean the Copper Pipes: Clean the outside of the copper pipes and the inside of the copper fittings using emery cloth or an abrasive cleaning pad. This ensures a clean surface for soldering.

Apply Flux: Apply a thin layer of copper pipe flux to the cleaned ends of the copper pipes and the inside of the copper fittings. Flux helps prevent oxidation and promotes solder flow.

Assemble the Connection: Insert the cleaned end of the copper pipe into the copper fitting. Ensure the fit is snug and the joint is properly aligned.

Soldering:

Ignite the propane torch and adjust it to a medium flame.
Heat the joint evenly by moving the flame around the joint. Start heating the fitting and then move the flame to the pipe. This helps prevent overheating one area.
Once the joint is hot enough, touch the tip of the solder to the joint. If the joint is hot enough, the solder will melt and flow into the joint through capillary action.
Apply solder around the entire circumference of the joint, allowing it to evenly fill the gap between the pipe and fitting.
Remove the heat and let the solder cool and solidify naturally. Avoid disturbing the joint while it cools.
Cool and Clean: Allow the soldered joint to cool completely. Once cool, use a clean, damp cloth to wipe away any excess flux or solder residue.

PVC Connection: Clean the outside of the PVC pipe and the inside of the PVC fitting. Apply PVC primer to the outside of the pipe and the inside of the fitting. Then apply PVC cement to both the pipe and fitting and quickly push them together, giving them a slight twist to ensure even coverage. Hold the joint firmly for a few seconds to allow the cement to set.

Support and Secure: Properly support and secure the pipes using pipe hangers and supports to prevent sagging or stress on the joints.

Pressure Test: Once all connections are made, it's essential to pressure test the system before burying or concealing the pipes. Use a pressure gauge to apply air pressure and check for any leaks. Address any leaks before proceeding.

Insulation: Consider insulating the pipes, especially if they are exposed to cold temperatures, to prevent freezing and potential damage.

Always follow the manufacturer's guidelines, local building codes, and safety precautions when soldering and working with pipes. If you're unsure about the soldering process, it's recommended to seek assistance from a professional plumber to ensure a reliable connection.