Installing a PVC repair or slip coupling involves preparing the pipe and coupling, applying solvent cement, and joining the pieces firmly. The critical steps during the final joining process, as noted in the reference, involve ensuring the coupling is fully seated, giving it a quarter turn, holding it, and wiping away excess cement.
A PVC slip coupling, often called a repair coupling, differs from a standard coupling because it lacks an internal stop. This allows it to slide freely along the pipe, making it ideal for bridging gaps in repair situations.
Here's a breakdown of the installation process, focusing on the final joining steps highlighted in the reference:
Steps for Installing a PVC Slip Coupling
Before installing the coupling itself, proper preparation is crucial.
1. Preparation (Briefly)
- Cut the Pipe: Ensure the damaged section is removed, leaving clean, square cuts on the existing pipe ends.
- Clean the Pipe and Coupling: Use a clean cloth to remove any dirt or debris from the pipe ends and the inside surfaces of the slip coupling where it will make contact.
- Dry Fit: Slide the slip coupling onto one pipe end (you can slide it well back out of the way for repair). Ensure the coupling fits snugly but can still be moved.
2. Apply Primer and Cement (Briefly)
- Apply PVC primer generously to the outside of the pipe ends and the inside surfaces of the coupling that will receive the pipe. Allow the primer to work for the recommended time (usually a few seconds).
- Apply a liberal, even coat of PVC solvent cement to the same surfaces where primer was applied. Work quickly, as cement sets fast.
3. Install the Coupling - The Key Joining Steps
Once primer and cement are applied, it's time to join the pipe ends with the slip coupling.
- Install the Coupling: Go ahead and install the coupling. Slide the slip coupling back over the gap and onto the other pipe end, quickly bringing the two pipe ends together inside the coupling.
- Ensure Seating: Make sure that it's fully seated. Push the coupling firmly onto both pipe ends until it reaches the desired position, ensuring complete contact between the cemented surfaces.
- Twist and Hold: Give it a quarter. Turn. And hold for a few seconds. Immediately after pushing the coupling on, give it a slight twist (about a quarter turn) to help spread the cement evenly and ensure a good bond. Hold the joint firmly in place for at least 30 seconds to allow the cement to set and prevent the pipe from pushing out.
- Wipe Excess: Again wipe off any excess solvent cement. Use a clean cloth to wipe away any excess cement that squeezes out from the joint. This provides a cleaner look and prevents the excess cement from potentially weakening the pipe over time.
4. Allow for Curing
Allow the joint to cure according to the solvent cement manufacturer's instructions before testing the system with pressure. Cure times vary depending on temperature, humidity, pipe size, and the type of cement used.
| Step | Action | Purpose |
|---|---|---|
| Install | Slide coupling onto cemented pipe ends | Bring pieces together for bonding |
| Ensure Seating | Push firmly into final position | Ensure full contact for a strong bond |
| Twist & Hold | Quarter turn and hold for ~30 seconds | Evenly distribute cement, prevent push-out |
| Wipe Excess | Remove squeezed-out cement | Clean finish, prevent long-term issues |
By following these steps, you can effectively install a PVC slip coupling for a reliable repair.
