Ethan Clarke
Glued PVC pipes can be challenging to separate, and while it is impossible to dissolve the solvent between the pieces of PVC, there are alternative solutions to removing glued PVC fittings. One method is to twist the pipe apart before the cement has set, cutting off the joint with a hacksaw, or heating up the joints. However, heating the joints may compromise the structural integrity of the pipe, making it unsuitable for reuse in pressure applications. For those who are unsure about the process, it is recommended to consult a professional plumber.
Ungluing a 4-inch plastic pipe:
| Characteristics | Values |
|---|---|
| Possibility of unglueing | It is impossible to unglue PVC pipes as the glue used is a solvent that melts the plastic, fusing the two pieces together. |
| Alternative solutions | Twist the pipe before the cement sets, cut the joint with a hacksaw, or heat the joints. |
| Heating technique | Use a hairdryer on high heat, point a heat gun, or use boiling water. |
| Safety precautions | Wear safety goggles, avoid skin contact, and work in a well-ventilated area. |
| Professional help | Consult a professional plumber if unsure about the process. |
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What You'll Learn
Using a hacksaw to cut the pipe
Using a hacksaw is a recommended method to cut a glued PVC pipe joint. It is important to note that you cannot unglue PVC pipes, but you can cut the joint and add an extension.
To cut the pipe, first, secure the pipe in a vice or clamp to prevent it from moving while you cut. If clamping is not possible, get someone to help brace and support the pipe. Next, choose the right hacksaw blade for the job. The blade needs to be harder than the material you are cutting. For PVC, use a blade with fine teeth, as these are designed for cutting metal, whereas blades with larger teeth are intended for cutting wood. If you are cutting a softer metal, such as aluminium, copper, or thin mild steel, use a blade with 14 to 32 teeth per inch (TPI). For harder metals, such as mild steel, iron, or galvanised pipe, use a blade with 6 to 14 TPI.
Once you have selected the correct blade, slowly draw the blade back and forth, ensuring that the cut is straight. It is more difficult to cut straight with a hacksaw, so take your time and be patient. You can also use cutting fluid to help with harder metals like steel, as it reduces friction and heat, extending the life of the blade. Apply the fluid along the cutting line before and during cutting.
After you have cut the pipe, you can add an extension. Find a new fitting that satisfies your needs and a coupling that matches the old and new fittings. Apply a thin layer of purple primer to the ends of the PVC fittings and the inside of the coupling. Once the primer is dry, coat the primed areas with clear PVC cement. Finally, push the pipe into the coupling while turning it a quarter turn.
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Applying heat to melt the glue
While it is impossible to unglue PVC pipes, applying heat to melt the glue is a potential solution to separate the pipes. This method is often a good solution for crafting or non-plumbing DIY projects.
One way to apply heat is to use a hairdryer on a high heat setting. Point the hairdryer at the joint and keep it on for a few minutes. The bond should break and the fittings will pop out. Once the plastic softens, use pliers to extract the PVC pipe.
Another method is to put the PVC pipe and fittings in boiling water. This will soften the plastic, allowing you to pull them apart. Keep in mind that you will need to pull steadily on the pipes to separate them.
You can also use a candle flame to heat the joint. Apply the flame to the joint until the plastic softens, then pull the pipes apart.
It is important to note that applying heat to PVC requires careful control. Excessive heat can cause the pipe to melt or deform, compromising its structural integrity and potentially causing leaks or breaks in the plumbing system. There is also a fire hazard to consider, as the high temperatures can ignite the PVC or nearby flammable materials. Always use safety goggles, avoid skin contact, and work in a well-ventilated area.
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Twisting the pipe to break the weld
If you've glued a PVC fitting or pipe in the wrong place, you can use the twisting technique to separate the pieces. You'll need to act fast, as you only have about two minutes before the solvent cement sets or cures.
To break the weld using the twisting technique, you'll need to apply a lot of force. Twist and pull the pieces apart simultaneously, continuing in the same direction as when you made the connection. This should break the weld that has started forming.
If you're working with 4" fittings or larger, it's recommended to have someone assist you. When you solvent weld two parts together, you push them in while simultaneously twisting 90 degrees. This creates a more airtight joint. After pushing and twisting the parts together, hold them like that for 10-30 seconds. This ensures the pieces don't back out.
While twisting the pipe to break the weld, be mindful that the twisting technique may not always work. If twisting doesn't break the weld, you'll need to try another solution, such as cutting the joint or fitting off the pipe with a hacksaw.
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Using a specialised drill bit
Although it is impossible to unglue PVC pipe, there are alternative solutions to removing glued PVC fittings. One method is to use a specialised drill bit called a PVC fitting saver. This drill bit is sized to drill and remove the pipe from inside the fitting. This method is particularly useful if you need to repair or replace a piece of PVC pipe or a fitting.
To use the PVC fitting saver, start by clamping the pipe with glue clamps to secure it in place. Ensure that the distance between the pipe edge and the drill hole edge is at least twice the thickness of the pipe. For example, if your pipe has a thickness of 10 mm, the distance between the pipe edge and the drill hole edge should be 20 mm.
Next, select the correct drill bit size for your pipe. The drill bit should be slightly smaller than the inner diameter of the pipe. This will ensure that you do not damage the pipe during the drilling process. Place the drill bit into the drill and adjust the speed and torque settings according to the manufacturer's instructions.
Slowly and carefully drill into the pipe, applying gentle pressure to allow the drill to do the work. Use a steady hand to guide the drill bit and avoid applying too much force, as this may cause the bit to break or damage the pipe. Continue drilling until you have created a hole through the glued area.
Once the hole is drilled, use a suitable tool, such as a pipe extractor or a pair of pliers, to grip the pipe and twist it gently. This will help loosen the glue and allow you to separate the pipe from the fitting. If necessary, apply a small amount of heat to the joint using a heat gun or a hair dryer to soften the glue and make it easier to twist and pull apart.
By following these steps, you can effectively use a specialised drill bit to remove glued PVC fittings without causing damage to the surrounding area.
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Cutting the pipe with a PVC cutter
While it is impossible to unglue PVC pipes, you can cut a 4-inch plastic pipe with a PVC pipe cutter. This is a quick and convenient way to cleanly cut PVC pipe.
To cut the pipe, place it on a stable surface like a workbench or cabinet. Clamp the pipe into place with a vise to avoid slippage and ensure your safety. Then, mark where you want to cut the pipe with a pencil or a permanent marker.
Line up the blade of the PVC cutter with the mark on the pipe. Hold the tool square and then squeeze the handles together to push the blade through the PVC. Continue the ratcheting action until the pipe is cut into two pieces.
If you want to achieve a smooth edge, you can use a deburring tool or a utility knife to remove any shavings or particles left behind after cutting.
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Frequently asked questions
It is impossible to unglue a plastic pipe. However, you can try to twist the pipe apart before the glue sets. If the glue has set, you can try to cut the pipe with a hacksaw or heat up the joints to melt the glue.
You will need to twist and pull the pipe with a lot of force to break the weld.
Cut the pipe along the fitting of the joint you want to unglue.
You can use a hairdryer on a high heat setting to melt the glue. Alternatively, you can use a candle flame or boiling water to heat the joints.
You will need to replace the pipe. To do this, prime the new pipe with a purple primer and let it dry. Then, apply PVC cement to the joints and couplings. Finally, turn the pipe stealthily to stretch it out of its glued area.
