Alexei Volkov
Bending compression plastic is a challenging task due to the material's unique properties. Unlike metal, plastic does not bend easily and requires careful manipulation to achieve the desired result. The thickness of plastic also plays a crucial role in the bending process, as thinner sections may be more susceptible to snapping or breaking. One common approach to bending plastic is the application of heat. This can be done using a hairdryer, heat gun, or oven to gradually increase the temperature until the plastic becomes pliable. However, it is important to exercise caution and patience during this process, as applying too much heat or force at once can cause the plastic to snap. Additionally, it's worth noting that bending plastic may not always yield a natural-looking result, especially when trying to replicate the appearance of thin metal parts.
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What You'll Learn
Using a brass compression nut and brass tube insert
Brass compression fittings are used with copper, aluminium, and thermoplastic tubing. They are not recommended for steel tubing or applications using gaseous media. Brass compression nuts and tube inserts are used in plumbing to connect a polyethylene water supply line to a refrigerator.
The process of using a brass compression nut and brass tube insert involves the following steps:
First, ensure that you have the correct size of brass compression nut and brass tube insert for your specific application. The size of the nut and insert must match the size of the tubing you are using.
Next, prepare the tubing by cutting it to the appropriate length and ensuring that the end is clean and free of any debris. If necessary, you can use a tube cutter or a sharp knife to cut the tubing to the desired length.
Insert the brass tube insert into the end of the tubing. The insert should fit snugly and securely inside the tubing. Make sure that the tubing is pushed firmly onto the insert to create a tight seal.
Then, slide the brass compression nut over the tubing, so that it covers the tube insert. Make sure that the nut is threaded onto the tubing in the correct direction. Tighten the nut using a wrench or by hand, ensuring that it is secure and will not leak. It is important not to over-tighten the nut, as this can damage the tubing or the fitting.
Finally, check the connection for any leaks. Turn on the water supply and inspect the fitting for any signs of leakage. If there are leaks, you may need to tighten the compression nut further or check that the tube insert is correctly seated inside the tubing.
When using a brass compression nut and brass tube insert, it is important to choose the correct materials for your application. Brass compression fittings are available in different brass alloys, such as CA360 for barstock fittings and CA377 for forged fittings. These fittings meet the specifications and standards of ASA, ASME, and SAE. Additionally, consider the temperature range and vibration resistance of the fitting. Brass compression fittings typically operate within a temperature range of 65°F to +250°F (-53°C to +121°C). For applications with excessive vibration, it is recommended to use a long nut to provide greater vibration resistance.
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Plastic tubing vs braided stainless line
When it comes to choosing between plastic tubing and braided stainless steel lines, there are several factors to consider in terms of durability, flexibility, aesthetics, and cost.
Durability is a key consideration when choosing tubing. Braided stainless steel lines are generally more durable than plastic tubing, especially for applications such as refrigerator ice makers. Stainless steel braided hoses can withstand higher pressure levels and temperature variations, making them suitable for both hot and cold water lines. They also provide better protection against corrosion, especially when compared to PVC flex tubes. However, it is important to note that not all stainless steel braided hoses are equal, and lower grades of stainless steel may be prone to corrosion and premature failure.
Flexibility is another important factor. Braided stainless steel lines are more flexible than rigid plastic or metal pipes, allowing for smoother hose curves and easier installation. This increased flexibility can also reduce the risk of hose bursts by accommodating various pressures and flow levels. On the other hand, PVC flex tubes made of braided nylon and PVC are highly flexible and offer excellent strength and ease of use, making them a popular choice for faucet and toilet connections.
Aesthetics may also play a role in your decision. Braided stainless steel hoses have a shiny metal finish with a textured, fabric-like appearance, making them more visually appealing than bare, coloured PVC pipes, especially in public settings where the pipes are visible.
Cost is a significant consideration when choosing between plastic tubing and braided stainless steel lines. Stainless steel braided lines are usually the most expensive option for flexible supply tubes. However, it is worth noting that the cost of replacing a lower-quality hose that fails prematurely can be insignificant compared to the damage caused by water flooding due to a catastrophic failure. Therefore, investing in a good-quality braided stainless-steel hose can provide a safe, long-lasting solution.
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Compression fittings with PEX/poly pipe
PEX, or cross-linked polyethylene, is a versatile plastic material used in pipework systems, hydronic radiant heating and cooling systems, and domestic water piping. PEX is most commonly used for indoor plumbing applications due to its flexibility, which allows for fewer fittings and easier installation.
Compression fittings are a type of coupling used to connect two pipes or a pipe to a fixture or valve. They are used to seal fluid within the pipes and prevent leakage through tight seals. They are commonly used with PEX tubing to secure the pipe and ensure a watertight seal.
When choosing compression fittings for PEX tubing, it is important to consider material compatibility, size, and resilience under varying pressures and temperatures. PEX compression fittings are available in different materials, such as brass, bronze, and poly or plastic. Brass crimp-style fittings are the most common and affordable option, while poly fittings are similar in appearance and can be installed using the crimp or cinch method. Push-fit or SharkBite fittings are unique in that they do not require the crimp or cinch method and instead utilise a built-in locking mechanism.
It is crucial to select compatible compression fittings for PEX tubing to maintain system integrity and performance. Compression fittings for PEX tubing offer a practical solution by providing a watertight seal in diverse applications. They are easy to install, reliable, and do not require special tools or heat/soldering during installation, making them a convenient choice for various plumbing applications.
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Compression fittings with copper, brass, aluminium, thermoplastic and plastic tubing
Compression fittings are used to connect two tubes or pipes together. They are commonly used with copper, brass, aluminium, thermoplastic, and plastic tubing.
When using compression fittings with these types of tubing, it is important to ensure that the tubing is compatible with the fitting and that a tight seal can be created. For example, when using a brass compression fitting with a thermoplastic or soft metal tube, it is necessary to generate an acceptable flare on the tube to ensure a secure connection.
Watts Ander-Lign compression fittings are specifically designed for use with plastic tubing and claim to be universal. These fittings are stronger than typical water filter/fridge water supply fittings and use an insert to secure the connection. When using Ander-Lign fittings, it is important to follow the manufacturer's instructions regarding the use of a plastic sleeve, as some fittings come with a captive sleeve, while others may require a separate sleeve to be purchased.
While plastic tubing can be used with compression fittings, it is important to note that it may be less durable than other materials. Over time, plastic tubing can develop pinholes or pull out of the fitting, leading to water damage. As such, it is recommended to use a braided stainless line for certain applications, such as refrigerator ice maker installations, as they are more durable and have a similar cost to plastic line kits.
Overall, when using compression fittings with copper, brass, aluminium, thermoplastic, or plastic tubing, it is crucial to select the appropriate fitting for the specific type of tubing and follow the manufacturer's instructions to ensure a secure and leak-proof connection.
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How to tighten compression fittings
Compression fittings are user-friendly and easy to install. They are composed of three parts: a valve, a sleeve, and a retainer nut. All these components work together to create a leak-free, solid joint. To tighten compression fittings, follow these steps:
Firstly, ensure you have the right tools and materials. You will need either two open-end wrenches sized to fit the retainer nuts or two adjustable wrenches. It is also recommended to use pipe dope to lubricate and seal the connections.
Before tightening the compression fitting, make sure that the fitting is pushed in all the way and seated squarely. Check that the shut-off is not cross-threaded. If there are any issues with the threads, use Teflon tape on the compression sleeve.
When tightening the compression fitting, be careful not to over-tighten it. "Do not over-tighten" is a warning for professionals, but if you are not a professional, you may need to tighten it more than you think. You should tighten it to the point where you feel a steep rise in torque. However, be cautious, as over-tightening can damage the fitting and lead to leaks.
If you are still experiencing leaks after tightening, consider using a small amount of pipe dope on the ferrule. This can help create a better seal and prevent leaks. However, some manufacturers advise against this, so use it sparingly and only if necessary.
By following these steps and being mindful of not over-tightening, you can effectively tighten compression fittings and create a solid and leak-free joint.
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Frequently asked questions
Ander-Lign is a unique compression fitting that is assembled with a captive sleeve. It is interchangeable with standard compression fittings and can be used with copper, brass, aluminum, thermoplastic, and plastic tubing.
A compression fitting is a type of coupling used to connect two pipes or a pipe to a fixture or valve. As the nut is tightened, the compression ring is pressed into the seat, creating a watertight connection.
Hold the compression fitting body tightly with a pair of grips and tighten the nut with a spanner. It is important not to over-tighten the fitting, as this can distort the olive or fitting. Generally, a nut will need one whole turn after hand-tightening.
Yes, Ander-Lign compression fittings are compatible with plastic tubing. However, some sources recommend avoiding plastic tubing if possible, as it may develop leaks over time. A braided stainless line is a more durable alternative.
The Ander-Lign fitting is described as having a captive sleeve, so an additional plastic sleeve may not be necessary. However, it is recommended to follow the specific instructions provided with your fitting to ensure proper installation.
