Chloe Zhang
Connecting two plastic tubes can be done in several ways. One method is to use a barbed hose coupling, which involves inserting a connector into the ends of the tubes. Another approach is to use solvent welding, where the natural sheen on the outside of the pipes is removed with wire wool, and solvent cement is used to fuse the two pieces of plastic together. A third option is to use a larger tube to connect the two smaller tubes, securing them with clamps.
Characteristics and Values Table for Connecting Two Plastic Tubes
| Characteristics | Values |
|---|---|
| Type of Connection | Barbed Hose Coupling |
| Tools/Materials | Wire Wool, UPVC Cleaner, Cloth, Solvent Cement, Hacksaw, Plastic Pipe Cutters |
| Steps | 1. Clean inside and outside of pipes with wire wool and UPVC cleaner. 2. Remove sheen from outside of pipe. 3. Let pipes dry. 4. Apply solvent cement to both surfaces to be fused. 5. Push pipes together and twist. 6. Leave under no stress for at least 25 minutes. |
| Tips | Use plastic pipe cutters to get straight cuts. Ensure pipe is clamped securely when cutting. |
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What You'll Learn
Using a barbed hose coupling
Barbed hose couplings are an effective way to connect two plastic tubes. They are versatile and can be used to securely connect water, gas, pneumatics, and more. To connect two plastic tubes using a barbed hose coupling, follow these steps:
First, ensure that your tubing is made of a flexible rubber or plastic material. Barbed fittings are designed to work with soft, flexible tubing and are not suitable for hard, rigid tubing. Examples of compatible flexible materials include polyurethane, silicone, nylon, and PVC.
Next, select an appropriate barbed hose coupling. These fittings come in various materials such as brass, stainless steel, plastic, and nylon, each offering different levels of durability and resistance. The barbed fitting should match the inside diameter of your tubing. Check the printed numbers on the sides of your tubing for the inside diameter (ID). The barbed coupling's outer diameter (OD) should be similar to or slightly larger than the tubing's ID to ensure a snug fit.
Before inserting the barbed fitting, there is a trick to make the process easier. Fill a cup with hot water and soak the end of the tubing in it for 10-20 seconds. This will make the tubing softer and more pliable. Now, push the barbed end of the coupling into the end of the hose. Ensure that the edge of the tubing is right up against the stop point on the barbed fitting. If there is a gap, keep wiggling and pushing the fitting further until it sits snugly in place.
Finally, secure the connection with a hose clamp. Slide the hose clamp over the tubing and tighten it with a screwdriver. Stainless steel hose clamps are an excellent choice as they won't corrode due to moisture. This will ensure a leak-free connection and increase the pressure the coupling can withstand.
By following these steps, you can effectively use a barbed hose coupling to connect two plastic tubes, creating a tight and secure joint.
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Replacing the tubing
If you are looking to replace tubing, it may be that the connector has broken. In this case, you will need to remove the old connector pieces from the ends of the tubing. Warm the tubes to make the plastic more malleable and use pliers to pull out the connector pieces.
You can then decide whether to replace the entire run with a new piece of tubing or attempt to join the two pieces. Joining the two pieces of tubing may be a more cost-effective option, as a few feet of tubing is not expensive.
To join the two pieces of tubing, you can use a barbed hose coupling. Alternatively, you can use solvent cement to fuse the two pieces of plastic together. This method is ideal for fusing two pieces of plastic piping of various shapes and sizes.
Firstly, you will need to cut the plastic pipe. You can use a hacksaw, but this may not result in a straight edge. It is recommended to use specialised plastic pipe cutters to achieve a straight line.
Next, you will need to prepare the pipe for bonding. Use wire wool to remove the sheen from the outside of the pipe. Clean the pipe with a UPVC cleaner, and then rub it with a cloth, inside and out, before allowing it to dry.
Coat both surfaces to be fused with the solvent cement, using a brush, and push the pipes together, twisting to ensure an even spread of the solvent in the join. The solvent cement will create a solid and waterproof bond. Once the pipes are joined, they must be left undisturbed for at least 25 minutes.
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Using a larger tube
One method for connecting two plastic tubes is to use a third, larger tube. This method requires that the smaller tubes fit inside the larger one. The inner tubes should be able to slide snugly into the larger tube, with a tight fit. This method can be strengthened by using hose clamps on the outside of the larger tube, ensuring sufficient compression.
To ensure the tubes fit together, you can use hot water to make the ends of the plastic tubes more supple, and then force them together. It is important to ensure the tubes are not under stress and are flexible. You can also use aluminium foil to wrap around the smaller tube, acting as a spacer, allowing the tubes to fit together without any wiggle.
This method has some disadvantages. Firstly, the tubes can slide easily, and the method may not work if there is high pressure. Secondly, if you are inserting a metal sleeve inside the smaller tube, you are reducing its inner diameter, which may cause issues.
An alternative to using a metal sleeve is to use heat-shrink tubing. This method is stronger than glue, but the tubes can still slip if pulled hard enough.
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Solvent joining
Firstly, you must clean the inside and outside of the pipes with wire wool to remove the natural sheen on the outside of the pipe. Then, use a UPVC cleaner to clean all parts of the pipe around the area to be joined to allow for a better bond, and let the pipe dry.
Next, evenly apply solvent cement with a brush to both surfaces to be fused. Ensure you are in a well-ventilated area, as the fumes can be dangerous. Push the pipes together and twist to ensure an even spread of the solvent in the join. This will ensure the bond is completely watertight and secure.
Once the pipes are joined, they must be left under no stress for at least 25 minutes. When the solvent cement sets, you will have a permanent and sealed connection between the pipes.
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Using hose clamps
Hose clamps are a great way to connect two plastic tubes, especially in plumbing and marine applications. Here is a step-by-step guide on how to use hose clamps to join two plastic tubes:
Step 1: Prepare the Tubes
Before joining the tubes, ensure they are clean and free of any debris or obstructions. Check the diameter of the tubes to ensure they are the same size and will fit snugly together.
Step 2: Choose the Right Hose Clamps
Select hose clamps that are suitable for the size and type of tubes you are joining. It is important to use high-quality clamps, such as those made by ABA or AWAB, to ensure a secure and long-lasting connection. For marine applications, use clamps made from marine-grade materials like stainless steel or bronze.
Step 3: Position the Hose Clamps
Loosen the hose clamps using an adjustable wrench or a screwdriver. Slide the clamps onto the first tube, ensuring they are positioned correctly and not too close to the end of the tube. The clamps should be snug but not too tight, as this can cause distortion or put too much pressure on the tube.
Step 4: Join the Tubes
Insert one end of the second tube into the corresponding end of the first tube. Push the tubes together firmly, ensuring they are fully inserted and there are no gaps. You can warm the tubes slightly to make the plastic more malleable and easier to work with.
Step 5: Tighten the Hose Clamps
Using your wrench or screwdriver, carefully tighten the hose clamps onto the joined tubes. Do not over-tighten, as this can cause the tubes to crack or the clamps to strip. Ensure both clamps are securely in place, providing an even and strong connection.
Additional Tips:
For below-waterline applications in marine settings, it is recommended to use two hose clamps for added security. Always measure the hose adapter to ensure it is long enough to accommodate two clamps safely. Regularly inspect your hose clamp connections and replace any worn or failed clamps promptly.
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Frequently asked questions
Solvent joining is a method for fusing two pieces of plastic piping. It is ideal for connecting pipes of different shapes and sizes. The solvent cement forms a solid and waterproof bond, similar to welding metal.
First, use wire wool to remove the natural sheen on the outside of the pipes. Then, clean all parts of the pipe around the area to be joined with UPVC cleaner and a cloth.
Coat both surfaces to be fused with solvent cement, using a brush. Ensure you are in a well-ventilated area as the fumes can be dangerous. Push the pipes together and twist to ensure an even spread of the solvent in the join.
Once the pipes are joined, they must be left under no stress for at least 25 minutes to ensure the bond is completely watertight and secure.
