Ethan Clarke
There are various methods to attach black plastic to fittings, depending on the type of plastic and the application. Black plastic piping, also known as black poly pipe or polyethylene pipe, is commonly used for water supply lines and drainage systems. When joining black plastic pipes, it is essential to ensure a watertight connection to prevent leaks. This can be achieved through several methods, including using solvent cements, primers, and creating strong joints. Additionally, fittings such as barbed inserts secured with hose clamps or pinch clamps, or push-to-connect fittings, are also recommended. For a more permanent solution, cementing connections or using threaded fittings can be considered, although these methods may not be suitable for all situations.
| Characteristics | Values |
|---|---|
| Type of black plastic | Polyethylene pipe (also called black poly pipe) |
| Fittings | Barbed (twister) inserts made of plastic or galvanized steel, secured with hose clamps or pinch clamps |
| Sprint push-to-connect fittings made by Apollo | |
| Union fittings (metal on one side and plastic on the other) | |
| Composite unions (metal on one side and plastic socket on the other) | |
| Standard threaded fitting with a metal thread | |
| Connection method | Slip the pipe over the fitting, install screw clamps, then tighten the clamps |
| Apply plumbing-grade pipe sealing compound ("goop") to the serrated fitting before sliding the pipe on | |
| Use a primer and solvent cement to glue the pipe and fitting together |
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What You'll Learn
Using glue or cement
When attaching black plastic to a fitting, it's important to identify the type of plastic you are working with. Black plastic is often made from ABS, which is commonly used for drain, waste, and vent pipes. To glue ABS, you can use a solvent cement specifically designed for this material. It's important to note that ABS does not typically have threaded fittings for attaching finish plumbing, so gluing may be the best option.
When gluing ABS, it is recommended to use a primer before applying the solvent cement. While some sources suggest using a purple primer, others recommend using a primer specifically designed for ABS or PVC. Allow the primer to dry for about 10 seconds before continuing. Then, apply an even layer of solvent cement to the inside of the fitting and the outside of the pipe using a brush or cotton ball. Work quickly, as you will only have a few seconds to align the pieces before they are permanently stuck together.
If you are joining black ABS plastic to white PVC plastic, it is recommended to use a transition cement specifically designed for this purpose. This type of cement is not suitable for pressure applications but will work for drain, waste, and vent applications. Additionally, a mechanical coupling is required when joining these two materials, as gluing them together is not advisable.
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Using a threaded fitting
When attaching black plastic to a threaded fitting, there are several factors to consider to ensure a secure and leak-proof connection. Here are some detailed instructions for using a threaded fitting:
First, it is crucial to determine the type of thread you are working with. The two most common types are NPT (National Pipe Thread) and NPS (National Pipe Straight). NPT threads are tapered, making them suitable for creating watertight seals, while NPS threads are straight or parallel. Inspect the male and female components of your fitting to ensure they are free of any contaminants, nicks, or burrs, which can compromise the seal.
When connecting plastic threads to metal threads, it is essential to consider the differences in material behaviour with temperature changes. Metal and plastic expand and contract at different rates and amounts, which can compromise the seal. Therefore, using a composite union fitting is recommended. These fittings have metal on one side and a plastic socket on the other, with an EPDM seal inside to maintain the seal even if one side expands more than the other.
If you are using a standard PVC threaded fitting with a metal thread, it is advisable to use a reinforcing ring. The reinforcing ring provides extra strength to the plastic, preventing cracking due to over-tightening. It also makes the connection more forgiving, reducing the risk of damage.
When assembling the threaded joint, it is crucial to use the correct thread sealant to prevent leaks. Select a sealant that is compatible with plastic and adds a little slipperiness to lubricate the joint. Ensure that the sealant is certified by the manufacturer to be harmless to the fitting material and will not contaminate the fluid in the pipe. Apply the sealant or Teflon seal tape to the threads, leaving the first couple of threads uncovered for proper threading.
Finally, tighten the joint securely. For smaller diameter threads, finger-tighten and then add no more than half to three-quarters of a turn with a tool. For larger ports, you can tighten it a full turn past finger-tight. Be cautious not to over-tighten, as it can cause splitting or cracking, especially with smaller diameter threads and plastic fittings.
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Using a composite union
When attaching black plastic to a fitting, one option is to use a composite union. A composite union is a fitting that is entirely metal on one side and entirely plastic on the other, with an EPDM seal inside. This seal allows for the expansion and contraction of the two different materials with temperature changes, preventing the seal from being compromised.
Composite unions are available with either female threads on the metal side or male threads on the metal side. They can also be made with stainless steel or brass. When using a composite union, it is important to consider the differences in the expansion and contraction of the metal and plastic materials with temperature changes. Without a reinforcing ring, the metal side expanding can crack the fitting, so it is recommended to use a reinforcing ring to give the plastic more strength.
To use a composite union, start by ensuring that you have the correct size and type of composite union for your specific application. Follow the manufacturer's instructions for proper use and safety precautions. Ensure that the metal and plastic surfaces are clean and dry before assembly.
Align the composite union with the fitting, ensuring that the metal side of the composite union matches the metal fitting. Thread the composite union onto the fitting by hand until it is secure. If necessary, use a wrench or pliers to tighten the connection further, but be careful not to over-tighten and damage the plastic.
It is important to note that composite unions are just one option for attaching black plastic to fittings. There are also standard threaded fittings and other special fittings available, each with its own advantages and considerations. The chosen method will depend on the specific application and the materials involved.
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Using barbed inserts
Barbed inserts are a versatile method to connect black plastic pipes. They are typically made of plastic or galvanised steel and can be secured with hose clamps or pinch clamps.
To begin, ensure that the black plastic pipe is made of a flexible rubber or plastic material. Barbed fittings are designed to work with soft, flexible tubing, so they are not suitable for hard, rigid tubing. Examples of compatible flexible materials include polyurethane, silicone, nylon, and PVC.
Next, choose a barbed insert that matches the inside diameter of your tubing. Look for the printed numbers on the sides of your tubing to find the inside diameter, or "ID". Use a barbed insert with a diameter that matches this measurement exactly, or it won't fit properly.
Now, slip the ring over the end of the barbed insert until it sits in the middle of the barbs inside the tubing. Hold the ring in place and tighten it by turning the fastening screw clockwise with a screwdriver. Avoid tightening the hose clamp by hand, as it may not create a tight enough seal.
Finally, insert and clamp the black plastic pipe onto the barbed insert to create a tight, leak-proof connection. This method can be used to securely connect water, gas, and more.
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Using push-to-connect fittings
When it comes to attaching black plastic fittings, one option is to use push-to-connect fittings. These fittings are designed for fast connections and disconnections without the need for additional tools. They are typically made from durable materials such as acetal copolymer and include a food-grade EPDM o-ring.
Push-to-connect fittings are commonly used with plastic tubing in industrial systems. They are versatile and can be used with air, gases, vacuum systems, and liquids. This makes them suitable for a wide range of applications, including pneumatic systems and fluid power components.
When using push-to-connect fittings with black plastic, it is important to ensure compatibility with the specific type of plastic tubing being used. Different types of plastic tubing may have varying levels of flexibility and temperature resistance, so selecting the appropriate fittings is crucial.
To install push-to-connect fittings, follow these general steps:
- Ensure that the black plastic tubing is cut to the correct length and properly prepared, with any burrs or sharp edges removed.
- Insert the tubing into the fitting: Simply push the tubing firmly into the fitting until it is fully seated. You should feel a slight resistance or a click, indicating a secure connection.
- Verify that the tubing is securely connected by gently pulling on it to ensure it is locked in place.
- If needed, you can disconnect the tubing by releasing the collet or locking mechanism and pulling the tubing out.
Push-to-connect fittings offer convenience and ease of use, making them a popular choice for various applications. They are designed to provide secure connections while allowing for quick adjustments or modifications to systems when needed.
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Frequently asked questions
There are a few ways to attach black plastic to fittings, depending on the type of pipe and fitting you are using. For black poly pipes, you can use barbed inserts made of plastic or galvanized steel, secured with hose clamps or pinch clamps. Alternatively, you can use push-to-connect fittings. For black ABS pipes, you can use glue or cement to bond them to PVC pipes.
A barbed insert is a type of fitting that has barbs or serrations on the inside to grip the pipe and create a watertight seal. To attach a barbed insert, you need to slide the pipe over the fitting, install screw clamps, and then tighten the clamps with a nut driver or socket wrench.
When gluing or cementing black plastic to fittings, it is important to use a solvent that is formulated for the specific type of pipe you are using. For black ABS pipes, you can use solvent cement, but avoid universal solvent cements. Make sure to follow the instructions on the label and take the necessary precautions as these solvents contain aggressive chemicals.
Yes, there are alternatives to gluing or cementing depending on the application. For example, you can use rubber couplings to connect unthreaded pipes of the same or different diameters. There are also composite unions that have metal on one side and a plastic socket on the other, which can be used to connect metal threads to plastic threads and reduce the risk of compromising the seal due to differences in temperature expansion and contraction.
