Omar Khalid
There are several methods for connecting plastic waste pipes, including solvent welding, push-fit joints, and compression fittings. Solvent welding involves using solvent cement to join plastic waste pipes and fittings for various wastes such as showers, baths, sinks, and domestic appliances. Push-fit joints are commonly used for twin-wall ducting systems, providing a simple and secure connection. Compression fittings, available in 32mm and 40mm sizes, are versatile and reliable solutions, especially when dealing with different pipe materials during renovations or repairs. Each method has its advantages and considerations, and the chosen technique depends on the specific requirements of the plumbing project.
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What You'll Learn
Using solvent weld or push fit joints
Using Solvent Weld Joints
Solvent weld joints use solvent cement (essentially a glue) to permanently join plastic waste pipes. Before gluing, ensure that the pipes are cut and cleaned. When measuring, make sure that your fittings are dry-fitted and in place so that you can measure right up to the base of each fitting's collar. The solvent weld will set fully in about 10 minutes, but it will be pretty solid after 1 minute and fully cured within 24 hours. However, this may vary depending on the manufacturer, so be sure to read their guidelines.
Using Push Fit Joints
Push fit joints are one of the most commonly used waste fittings, mainly due to their ease of use. They are constructed from polypropylene, which is hardwearing, heat-resistant, and chemical-resistant. To use push fit joints, simply push the pieces together. Each section of pipework features a small, thin captive rubber collar that, when a section of pipe is pushed in, forms a watertight seal around the pipe that prevents leaks. Before cutting the pipe, ensure that it is clamped securely so that it does not move. Use a hacksaw to make your cut, checking regularly that you are cutting straight. Once cut, remove any burrs using a half-round file or a de-burring tool. Smear the pipe with silicone grease or spray it with silicone to help the pipe push past the "O" ring. Push the pipe into place, ensuring that the cut end goes all the way into the fitting to the pipe stop.
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Using compression fittings
Compression fittings are a versatile and reliable solution for connecting plastic waste pipes made from different materials, making them especially useful in renovations or repairs involving mismatched systems. They are compatible with modern plastics and older metal pipes, including copper, lead, and iron waste pipes. Compression fittings are available in 32mm and 40mm sizes, making them suitable for a variety of domestic waste systems.
Each compression fitting joint consists of three key components: a compression nut, a plastic washer, and a rubber seal washer. The compression nut is used to tighten and secure the fitting, while the plastic washer helps position the pipe within the fitting. The rubber seal washer creates a watertight connection by compressing against the pipe.
To use compression fittings, start by cleaning and deburring your pipe to remove any dirt and residue. You can use wire wool or a pipe wrench for this step. Mark your cooling times on the pipework next to the fitting, along with any other relevant information. Cut the pipe squarely using a pipe cutter or hacksaw, and remove any burrs with sandpaper or a deburring tool. Ensure that the pipe ends are clean and free of debris.
Now, slide the compression nut down the pipe, followed by the plastic washer and the rubber washer. Insert the waste pipe into the compression fitting body and push the pipe until it reaches the pipe stop. Check that the rubber washer is not twisted, then slide the compression nut and washer up and start the nut on the threads. Tighten the nut in a clockwise direction, being careful not to cross-thread it. Repeat this process with the other pipe, and you will have successfully created a compression waste joint.
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Connecting plastic pipes to old copper, lead or iron pipes
Connecting plastic pipes to old copper, lead, or iron pipes can be challenging due to the differences in materials and pipe diameters. Here is a step-by-step guide to help you through the process:
Prepare the Pipes
Start by cleaning both the plastic and metal pipes to ensure there is no debris or residue that could hinder the connection. Use a pipe cutter or hacksaw to squarely cut the pipe ends, and then remove any burrs with sandpaper or a deburring tool. This will ensure a smooth and even surface for the joint.
Choose the Right Fittings
Compression fittings are the best option for connecting plastic pipes to old copper, lead, or iron pipes. These fittings are versatile and reliable, providing a leak-free connection between different pipe materials. Compression fittings are available in 32mm and 40mm sizes, so choose the size that best suits your pipe diameters.
Assemble the Compression Fitting
A compression fitting consists of three main components: a compression nut, a plastic washer, and a rubber seal washer. The plastic washer helps to position the pipe within the fitting, while the rubber seal washer creates a watertight connection by compressing against the pipe. Ensure you have all the components and assemble them correctly according to the manufacturer's instructions.
Join the Pipes
Insert the plastic pipe into the lead, copper, or iron pipe, making sure they are securely connected. Use sliding joint water-pump pliers to gently crimp the top edge of the metal pipe around the plastic pipe, creating a neat and secure joint. Tighten the compression nut to secure the fitting and ensure a strong connection.
Final Checks
Once the pipes are joined, check the connection for any signs of leaks or irregularities. If needed, you can use sealing mastic or tape to reinforce the joint and ensure a watertight seal. However, if the connection is made properly, the low pressure within the pipes should not require additional sealing.
Connecting plastic pipes to old copper, lead, or iron pipes can be a delicate process, especially when dealing with old pipe materials. It is important to work carefully and ensure a secure and leak-free connection to avoid future plumbing issues.
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Using a strap-on boss adaptor
Connecting plastic waste pipes using a strap-on boss adaptor is a straightforward process, but it's important to ensure a secure, leak-free connection. Here's a step-by-step guide on how to do it:
First, you'll need to identify the type of strap boss connector you have. In most cases, it will be either a push-fit or a solvent weld. A push-fit connection is exactly as it sounds—the pipe is pushed into the connector, and a rubber lip or seal inside the connector holds it in place. A solvent weld connection, on the other hand, uses solvent weld cement to create a strong, permanent bond between the pipe and connector.
If you have a push-fit connection and it's wobbly or loose, you can remove the pipe, clean around the seal, and then refit the pipe. This is a neat solution and will ensure a tighter fit. Alternatively, you can leave the pipe as it is and use a silicone sealant around the outside of the joint to secure it. However, this option might not be accessible for future adjustments once the bathroom is fitted, so it's crucial to ensure that it's leak-free.
For a solvent weld connection, you'll need to apply solvent weld cement to both the pipe and the connector. Insert the pipe into the connector and hold it in place for a few minutes to allow the cement to set. Again, make sure that the connection is leak-free to avoid any costly repairs later.
In some cases, you might need to use an adaptor to connect the waste pipe to the strap boss. There are various adaptors available, such as the Polypipe Boss Pipe Rubber Connector, which is a push-fit adaptor designed to adapt 50mm pipe connections on 40mm pipes. You can also find PVC reducer couplings and Y-shaped branch connectors to accommodate different pipe sizes and configurations.
When using an adaptor, follow the manufacturer's instructions carefully. In most cases, you'll insert the adaptor into the boss opening and then connect the waste pipe to the adaptor. Ensure that the waste pipe is properly aligned and doesn't protrude too far into the soil pipe. Also, remember to clean the inside of the soil pipe and boss opening to prevent leaks or blockages.
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Using a short boss pipe
To begin, ensure that you have identified the type of pipes you are working with, as there are various sizes of waste pipe available for different purposes. Soil pipes, for example, are typically manufactured from uPVC and come in diameters of 21.5mm, 32mm, 40mm, or 110mm, with wider diameter pipes available if required.
Once you have identified the pipe types, you can install the short boss pipe along the soil pipe run. Secure the joints using solvent cement to create a permanent and watertight seal. If you are using a solvent weld, ensure you allow adequate time for the cement to cure and form a strong bond.
If your soil pipe does not include any bosses, you will need to use a boss adapter to connect the waste pipe to one of the boss connections on the soil stack. Push the waste pipe into the boss adaptor, ensuring it sits about 1 cm inside the soil pipe to avoid blockages. Drill out additional boss openings if needed; short boss pipes typically come with one open boss and two closed ones.
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Frequently asked questions
There are two main types of plastic waste pipes: solvent weld and push fit joints. Compression fittings are also used to connect plastic waste pipes.
To connect plastic waste pipes using solvent weld joints, you will need to use solvent cement. First, cut and clean the pipe. Then, dry fit the pipe through the sink waste and into the sink waste trap. Next, dry fit a 90-degree solvent weld bend to the other end of the pipe and measure the length of the pipe needed to reach the soil pipe. Cut the pipe to the correct length and insert it into the boss adaptor. Finally, slip the boss over the pipe, fix it in place, and allow the solvent cement to set.
Compression fittings are ideal for connecting different pipes together and can be used with older metal pipes. They create a secure, watertight connection using a compression nut, a plastic washer, and a rubber seal washer. First, ensure the pipe ends are clean and free of debris. Cut the pipe squarely and remove any burrs with sandpaper or a deburring tool. Then, insert the pipe into the compression fitting and tighten the compression nut to secure the connection.
Push-fit joints are simple and quick to install. They are commonly used for joining ring seal soil, waste, and underground drainage pipe systems. To install, lubricate the chamfered end of each pipe section with a silicone or water-based pipe lubricant. Then, push the pipes squarely and evenly into the fitting to compress the rubber seal and create an airtight and watertight joint. Finally, withdraw the pipe by about 10mm to allow for expansion.
