How to Join Different Types of Plastic Pipe. Ring Seal, Solvent Weld, Compression, Electro-Fusion and more Explained!

At EasyMerchant, we stock a vast selection of plastic piping, and we often receive queries about how to connect various types of pipes. To help you out, we've created a straightforward guide to walk you through connecting different kinds of plastic pipe:

• Twin wall ducting & drainage
• Solvent waste & soil
• Ring seal soil, waste, and underground
• Electrofusion
• Compression/mechanical

If you encounter any issues while connecting your pipework, don't hesitate to reach out in the comments or give the EasyMerchant team a call.

How to Join Twinwall Ducting and Drainage Pipes

Most twin wall ducting products come with a coupler attached at one end. However, it's wise to verify this before ordering to avoid delays. For connecting two lengths of twin wall ducting, a simple push-fit between the coupler and the next length of pipe will suffice. However, since the coupler lacks an internal seal, there might be minor leakage. If you're dealing with surface water, this may not pose a problem, but if you're handling waste or chemicals, sealing the connection is essential. To add a seal, choose the right-sized twinwall pipe seal and place it between the first and second ribs of the twin wall pipes entering the coupler. This will make the coupling slightly harder to insert but will ensure it's watertight. If your twin wall ducting system will carry corrosive or harmful substances, consider using nitrile seals. These are custom-made and subject to lead times, but our technical team can assist based on your specific needs and soil reports.

How to Join Solvent Waste and Soil Pipes

To connect a solvent waste pipe to a soil pipe, a 'boss' fitting is typically used, either pre-installed in the soil pipe or added as an adaptor. If you're using a boss pipe section, you'll need to cut out a portion of the soil pipe. Alternatively, a strap-on boss adaptor simplifies the process significantly. Here's a six-step guide:

1. Cut the appropriate size hole in the soil pipe where you want the connection.
2. Clean the area around the connection point thoroughly with a specific pipe cleaner.
3. Apply solvent cement weld around the hole and the flange of the strap-on boss.
4. Orient the boss so its 'top' indicator is correctly aligned.
5. Press the boss and soil pipe together to create a secure bond.
6. Squeeze the clips at the back of the boss together to lock the connection in place.

How to Join Ring Seal Soil, Waste, and Underground Pipe

Connecting ring seal soil, waste, and underground drainage pipe systems is quick and easy, allowing for easy disassembly if necessary. Each pipe section has a chamfered end that should be lubricated with either a silicone or water-based pipe lubricant before pushing it squarely into the fitting. This compresses the rubber seal, creating an airtight and watertight joint. After inserting the pipe into the fitting, pull it back by about 10mm to account for any expansion within the system.

How to Join Electrofusion Pipe and Fittings

Electrofusion fittings are commonly used in gas main applications and require proper training and certification. They also require a control box, which has specific operating procedures. While this guide offers an overview, we’re always happy to provide more detailed information and product recommendations. Contact the EasyMerchant team for assistance.

1. Ensure the polyethylene pipes are clean and free of debris, but do not remove the protective wrap.
2. Position the electrofusion fitting near the pipe and mark approximately 10-15mm beyond half the socket depth.
3. Use a pipe end preparation tool to remove the entire surface of the pipe over the marked area in one continuous motion.
4. Repeat this for the second pipe end.
5. Mark half the coupler depth on each pipe end to ensure even connection depths.
6. Secure the pipes in place to prevent movement during the fusion process.
7. Connect the ECU outputs to the fitting terminals and follow the control unit instructions.
8. Check the melt indicators if present to confirm successful completion.
9. Mark cooling times on the pipe near the fitting, along with joint reference numbers and dates.

How to Join Compression/Mechanical Pipes and Fittings

Compression or mechanical pipe connections are common in domestic settings and offer a cost-effective, easy-to-use solution. A compression-style MDPE pipe joint features a partial dish-shaped end housing a cone-shaped rubber washer, often topped with a tough plastic washer. A threaded MDPE nut secures the washer stack over the joint, compressing the washer and causing it to expand laterally. Connecting a compression joint is simple:

1. Clean and deburr the pipe with wire wool to remove dirt and residue.
2. Completely open the nut and washer stack on the compression joint.
3. Slip the nut, washer, and rubber washer onto the pipe you're connecting, ensuring the rubber washer fits tightly and sits at least 15-20mm onto the pipe.
4. Slide the joint body onto the pipe until it fits snugly against the rubber washer.
5. Slide the washer and nut down the pipe until they cover the rubber washer and bite into the threaded section of the joint.
6. Tighten the nut to compress the rubber washer, creating a secure, watertight connection.

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