Replacing a section of PVC pipe involves cutting out the damaged portion and installing a new section using primer and cement. Here's a step-by-step guide:
1. Preparation and Safety:
- Turn off the water supply: Locate the shut-off valve upstream of the damaged pipe and turn it off completely. This is crucial for preventing leaks and flooding.
- Gather your materials: You'll need:
- New PVC pipe (same diameter as the existing pipe)
- PVC primer
- PVC cement
- PVC couplings (slip couplings are best for repairs)
- Hacksaw or PVC cutter
- Measuring tape
- Clean rags or paper towels
2. Cutting Out the Damaged Section:
- Mark the cut lines: Measure and mark the PVC pipe on either side of the damaged area. Be sure to cut back to solid, undamaged pipe. Allow enough space for the couplings on either end.
- Cut the pipe: Use a hacksaw or PVC cutter to carefully cut the pipe at your marked locations. Aim for clean, straight cuts.
- Remove any remaining water: Drain all water from the pipe section. Use rags or towels to dry the inside and outside of the existing pipe near the cut ends. The pipe must be dry for the primer and cement to bond properly.
3. Preparing and Installing the New Section:
- Measure and cut the new pipe: Measure the gap where the old section was removed. Cut a new piece of PVC pipe to fit the gap, minus the depth of the couplings that will be used on each end. For example, if the gap is 12 inches and each coupling adds 1 inch of depth, cut the new pipe to 10 inches.
- Dry fit: Before applying primer and cement, dry-fit the new pipe and couplings to ensure everything fits correctly.
- Apply primer: Apply PVC primer to the outside of the existing pipe ends and the inside of the couplings. Primer softens the PVC, preparing it for the cement. Follow the manufacturer's instructions regarding drying time.
- Apply cement: Apply PVC cement to the same areas where you applied the primer: outside of the existing pipe ends and the inside of the couplings. Work quickly, as the cement sets relatively fast.
- Assemble the connections: Immediately slide the couplings onto the existing pipe and the new pipe segment. Twist the pipe slightly as you push the connections together to ensure even cement distribution. Hold the connection firmly for about 30 seconds to allow the cement to set.
- Allow to cure: Allow the cement to fully cure according to the manufacturer's instructions (typically 24 hours) before turning the water back on.
4. Testing the Repair:
- Turn on the water supply slowly: Gradually turn the water supply back on, checking for any leaks at the newly cemented joints.
- Check for leaks: Carefully inspect the repaired area for any signs of leaks. If leaks are present, turn off the water supply immediately and allow the cement to fully cure (even longer than the recommended time). If the leak persists, you may need to redo the connection.
