Omar Khalid
Threading grey plastic pipe is a process used to mechanically join two sections of plastic tubing, creating a leak-free service. This is often done to contain higher pressures, greater than 100 PSI, and for deep submersible well applications. To thread grey plastic pipe, you will need to purchase or rent a manual ratcheting pipe threader, which can be used to cut threads into the end of a pipe. The process involves lubricating the end of the pipe, selecting the appropriate die head for the pipe's diameter, and securing the pipe in a vise before cutting the threads. It is important to follow proper installation guidelines to avoid issues with stress cracking and over-tightening.
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What You'll Learn
Choosing the right equipment
First, assess the nature of the job. Is it a simple home repair, or are you working on a complex plumbing project? The scope and complexity of the task will dictate the type of equipment you need. For basic home repairs, a manual ratcheting pipe threader should suffice. These can be purchased or rented from home improvement centres. If you're a plumbing professional or tackling extensive pipe threading, investing in a handheld power threader or a threading machine might be more efficient. These automatic threaders are more expensive but offer increased convenience and speed.
Next, select the appropriate die head for your plastic pipe. The die head, which attaches to the ratcheting pipe threader handle, should be chosen based on the pipe's diameter. Refer to the markings on the die head or the manufacturer's instructions to determine the correct size. This step is crucial to ensure a secure fit and effective threading.
Protective gear is also essential when working with pipes. Ensure you have work gloves to protect your hands from metal shavings and accidental cuts. Safety goggles or glasses will shield your eyes from any debris or metal slivers.
Additionally, you'll need cutting oil or threading oil. This oil lubricates the pipe and the die head, making it easier to cut the threads and reducing friction. Pipe wrenches are another important tool to have on hand, as they provide leverage and help you apply the necessary pressure during the threading process.
Finally, consider the specific type of plastic pipe you are working with. Different types of plastic pipes have unique characteristics and requirements. For example, PVC pipes have specific assembly guidelines, including the use of pipe dope or PTFE paste for sealing. If you're working with PEX or polybutylene pipes, ensure you use the appropriately sized conduit for solid floor applications to protect the pipe from thermal expansion.
By carefully selecting the right equipment, you can confidently approach your grey plastic pipe threading project, ensuring a safe and effective outcome.
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Preparing the pipe
Firstly, it is important to select the appropriate pipe for threading. Only Schedule 80 and Schedule 120 PVC pipes are suitable for threading due to their thicker wall thickness. Schedule 40 pipes have thinner walls and are not recommended for threading as it may compromise their strength.
Once you have selected the correct pipe, it's time to set up your work area. Put on work gloves and safety glasses to protect yourself from any metal shards and debris during the process.
Now, you need to secure the pipe firmly in a vise. Loosen the jaws of the vise by turning the handle counterclockwise, insert the pipe, and then tighten it securely by turning the handle clockwise. Ensure that the end of the pipe you want to thread is sticking out by 6 to 8 inches from the clamping mechanism. Wrap a rag around the pipe where it will mate with the clamp to protect the plastic surface from damage.
The next step is to lubricate the pipe. Apply a generous amount of threading oil to the outside end of the pipe that will be threaded. This will make it easier to cut the threads and prevent the die head from overheating.
Finally, choose the correct die head for your pipe's diameter. Read the numbers indicated on the die heads and select the one that matches your pipe size. The die head is the part of the pipe threader that cuts the threads. You can purchase or rent a ratcheting pipe threader with various die heads at a home improvement store or hardware store.
By carefully following these steps, you will have successfully prepared your grey plastic pipe for threading, ensuring a smooth and efficient process.
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Using a ratcheting pipe threader
To use a ratcheting pipe threader, start by choosing the right die head for your pipe. The die head is the part of the pipe threader that actually cuts the threads, and it comes in different diameters. Select a die head that matches the size of your pipe. You can purchase or rent a ratcheting pipe threader and die heads at a hardware store or home improvement centre. An inexpensive ratcheting pipe threader with multiple die heads typically costs between $40 and $60 USD.
Once you have the right die head, attach it to the ratcheting pipe threader handle. Before you begin, make sure to put on work gloves and safety glasses to protect yourself from any metal slivers and accidental cuts. Lubricate the end of the pipe generously with threading oil. This will make it easier to attach the die head and cut the threads. You can use a pipe vise to secure the pipe and make the process easier.
Now, place the die head onto the end of the lubricated pipe. Slide the centre hole of the die cutter onto the pipe and push it as far as it will go. If it's difficult to get onto the pipe, apply more threading oil. Once the die head is in place, start ratcheting the handle. Continue ratcheting until the pipe threader has completely cut through the pipe. Then, switch the rotation by ratcheting the handle in the opposite direction to disengage the teeth of the die head from the threads.
Finally, remove the die head from the pipe by turning it counterclockwise until it's completely unbolted. Remember to seal the threaded connections with pipe sealant, Teflon tape, or a liquid pipe thread compound to prevent leaks and protect the pipes from corrosion. You can use sandpaper to remove any burrs from the surface and ensure a clean connection.
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Avoiding common mistakes
Threading grey plastic pipe, or polyvinyl chloride (PVC) pipe, is a process used to mechanically join two sections of plastic tubing. This is a reliable method for containing higher pressures, exceeding 100 pounds per square inch (PSI). While threading PVC pipe is a straightforward process, there are some common mistakes to avoid.
Firstly, ensure you are using the correct type of PVC pipe. Only Schedule 80 and Schedule 120 PVC pipes can be threaded. The wall thickness of Schedule 40 PVC pipes is too thin, compromising the strength of the joint. When purchasing the pipe, check that it is either Schedule 80 or Schedule 120.
Before beginning the threading process, it is crucial to take the necessary safety precautions. Wear work gloves and safety glasses to protect yourself from sharp shavings and debris. Failure to wear protective gear can result in injuries.
When setting up the pipe for threading, avoid over-tightening the clamp as this can crack the pipe. Secure the pipe firmly but not excessively. Additionally, be cautious when selecting a sealing compound. Some compounds contain oils that can damage plastic. Always choose a sealing compound specifically designed for use with plastics.
During the threading process, avoid using any type of cutting fluid on the PVC pipe. Cutting fluids can clog the die cutter and interfere with the quality of the threads. Instead, use threading oil to lubricate the die head and facilitate the cutting action. If you encounter resistance while cutting, apply more threading oil to the exposed teeth of the die head.
Finally, be mindful of the number of turns when assembling threaded PVC fittings. For Schedule 40 or Schedule 80 fittings, finger-tighten first, and then add one to two turns at most. Adding too many turns can cause strain on the female part of the fitting, leading to stress cracking or splitting.
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Ensuring a leak-free service
Plastic piping and threaded fittings are generally reliable when it comes to providing a leak-free service. However, issues with stress cracking can occur if proper installation guidelines are not followed. Here are some tips to ensure a leak-free service when working with plastic pipes:
Choose the Right Materials
Before starting any plumbing project, it is important to select the appropriate materials. Ensure that the pipe and fitting materials are compatible. For example, PTFE tape is intended for metal pipes and not plastic. Pipe dope and PTFE paste can be used with both metal and plastic. When working with threaded plastic fittings, opt for a sealant designed specifically for plastic. Some sealants contain oils that can damage plastic, so it is crucial to choose a non-hardening compound that can be forced into potential leak areas by water pressure, completely sealing them.
Prepare the Pipes
Before applying any thread sealant, check that your system and the materials used are approved and compatible with the thread. Clean all pipe threads to ensure they are free from rust, scale, grease, and other contaminants. Use a clean cloth or wire brush to remove any debris.
Apply the Sealant
When applying the thread sealant, brush it across the threads rather than in the same direction as the threads to ensure better coverage and properly filled joints. If using tape, wrap it around the male threads first, stretching and tearing the tape to complete the wrap. Then, spread a thin layer of pipe joint compound over the tape. If working with plastic pipe, choose a pipe joint compound that is compatible with plastic, such as Teflon pipe joint compound.
Tighten the Connections
Hand-tighten all joints first, then use wrenches to tighten the connection further. Avoid over-tightening, as this can cause strain and lead to cracking or other issues. For compression fittings, use two wrenches to firmly tighten the connection and crimp the ferrule onto the pipe. Ensure that the pipe goes straight into the fitting, as misalignment will cause a leak.
Additional Tips
- When working with plastic pipes, avoid using CPVC female threaded adapters. The stress of cranking in a metal nipple can cause microscopic cracks that can lead to leaks.
- Avoid solid copper or chrome supply lines, as they can restrict water flow over time. Instead, opt for flexible supply hoses with braided coverings when replacing faucets or toilets.
- Lubricate drain tubing and slip joints with pipe joint compound to help the washer slide smoothly and create a tighter seal.
- For slip joints, ensure that plastic trap parts use hard plastic slip joint washers, with the flat part against the nut and the tapered side facing the fitting.
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Frequently asked questions
You will need a manual ratcheting pipe threader, work gloves, safety glasses, and threading oil. You can purchase or rent a ratcheting pipe threader and die heads at a home improvement centre or hardware store.
First, lubricate the end of the pipe with threading oil. Then, place the die head onto the end of the pipe. Ratchet the handle so that the die head spins onto the pipe, cutting threads as it goes.
Only Schedule 80 and Schedule 120 PVC pipes can be threaded. Do not use any type of cutting fluid on the pipe while cutting the threads. When assembling threaded PVC fittings, finger-tighten, then add one to two turns, but no more.
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