Sofia Martinez
Plastic pipes are often stored and transported in coils, which can make them tricky to straighten. There are several methods to straighten plastic pipes, including using a pipe bender, applying heat, or soaking the pipe in warm water. Some people suggest using a hairdryer or heat gun, while others recommend running hot water through the pipe. Leaving the pipe in the sun for a few hours is another option, as is soaking the pipe in warm water for one to two hours.
| Characteristics | Values |
|---|---|
| Techniques | Running hot water through the pipe, soaking the pipe in hot water, using a hair dryer, using a heat gun, leaving the pipe in the sun, using a pipe straightener, using a pipe bender |
| Pros | Running hot water through the pipe is efficient, using a hair dryer is safe, leaving the pipe in the sun is a workout, using a pipe straightener is easy |
| Cons | Running hot water may be wasteful, using a heat gun may be unsafe, using a pipe straightener may be expensive |
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What You'll Learn
Using hot water
Next, connect one end of the pipe to a hot water source, such as a tap. Ensure the water temperature is not too high, ideally between 40-50°C, to avoid potential damage to the pipe. Begin pumping the hot water through the pipe. The heat from the water will gradually straighten the pipe as it flows through. It is important to maintain a consistent flow rate to ensure that the pipe straightens evenly.
While the hot water is running through the pipe, you can apply manual pressure to further assist the straightening process. This can be done by gently bending the pipe in the opposite direction of its coils at regular intervals. However, be cautious not to overdo this, as excessive bending may cause the pipe to buckle or develop kinks.
After running hot water through the pipe, it is essential to flush it with cold water to set its straight shape. This final step will help the pipe retain its desired form and prevent it from reverting to its coiled state. By following these steps, you can effectively straighten plastic pipes using hot water, ensuring they are ready for installation or any desired application.
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Soaking the pipe in warm water
Soaking or running warm water through a plastic pipe is an effective way to straighten it. This method works well with MDPE pipes, which are often stored and transported in coils. The coils are beneficial for saving space but can be tricky to lay out when they quickly recoil. The warmth of the sun on the pipes while they are coiled can also contribute to this.
To straighten the pipe, you will need to connect one end to a tap that dispenses hot water. Then, lay the pipe out as flat as possible and begin pumping hot water through it. This process will quickly straighten the pipe. Running cold water through the pipe at the end of the process will ensure that it stays straight.
If you do not have access to a hot water tap, another option is to soak the pipe in a container of warm water. The water should not be boiling but should be between 40-50°C. You can also try placing a metal rod through the centre of the pipe and boiling it in water. This method is effective, as PVC tubing is often heat-set with boiling water during manufacturing.
It is important to note that applying too much heat can cause the physical properties of the pipe to change, leading to breakage, cracking, or splitting. Therefore, it is recommended to avoid using heat guns or boiling water directly on the pipe.
Additionally, you can combine this method with others to achieve better results. For example, you can secure one end of the pipe to a stationary object, stretch it to unbend it, and then secure the other end to another object. Leaving the pipe in this position for several hours will help it "learn" its new shape.
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Applying heat with a hairdryer
To straighten a plastic pipe using a hairdryer, start by heating a specific section of the pipe with the dryer. Aim for temperatures between 99 and 135 degrees Celsius, which is ideal for bending PVC pipes. Once the desired section is heated, slowly apply pressure to bend the pipe to the required angle. After achieving the desired angle, remove the hairdryer. It is important to take your time with this process, slowly heating and bending the pipe to achieve the best results.
Although using a hairdryer to straighten a plastic pipe is a viable option, it is not without its risks. One of the main concerns is overheating the pipe, which can cause it to collapse, kink, or become warped. Therefore, it is crucial to work slowly and carefully to avoid applying too much heat in one spot. Additionally, when heating and bending plastic pipes, there is a risk of releasing dangerous dioxins and other toxic gases. To mitigate this risk, ensure that you work in a well-ventilated area and wear a respirator to protect yourself from inhaling these harmful substances.
Another consideration when using a hairdryer to straighten a plastic pipe is the potential for uneven heating. It can be challenging to heat the pipe uniformly, which may affect the final shape and integrity of the pipe. This method may also be time-consuming, as it can take up to 30 minutes to heat the tubing sufficiently for bending.
When using a hairdryer to straighten a plastic pipe, it is essential to exercise patience and caution. Take your time to heat the pipe gradually and avoid overheating or applying excessive force during the bending process. By following these guidelines, you can effectively straighten a plastic pipe using a hairdryer while minimizing the risks of damage or personal harm.
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Leaving the pipe in the sun
Leaving a plastic pipe out in the sun is one way to straighten it. However, this method may not be effective for all types of plastic pipes. For instance, while it is possible to straighten MDPE pipes by leaving them in the sun, it is difficult to straighten coiled poly pipes using this method.
MDPE pipes are often stored and transported in coils, which can be tricky to handle when laying them out. To straighten them, you can leave the coil unravelled outside in a sunny spot. Over time, the sun's heat will cause the pipe to return to its original straight shape. To speed up the process, you can tie the pipe to a straight piece of timber or metal. Although this method requires minimal effort, it can be time-consuming, especially in locations with less sunlight.
Similarly, poly pipes can be left in the sun in an attempt to straighten them. However, one user reported that their poly pipe always returned to its coiled state when used in close-coupled situations, even after trying to straighten it by leaving it in the sun. This method may be less effective for poly pipes due to their inherent flexibility.
It is important to note that while sunlight can help straighten some plastic pipes, it can also cause degradation over time. All plastics, including PVC pipes, will break down when exposed to sunlight. Therefore, while leaving a plastic pipe in the sun may help straighten it, prolonged exposure should be avoided to prevent damage.
As an alternative to sunlight, you can run hot water through the pipe to reshape it more quickly. This method requires a connection to a hot water source and a flat surface to lay the pipe out. After pumping hot water through the pipe, cold water can be run through it to ensure it stays straight.
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Using a pipe bender
Align the curve with the correct symbol and match the top of the pipe with the degree marker. To make the bend, apply steady, firm pressure to the foot hold. When bending, use gradual pressure to avoid kinking the pipe. If the curve is not at the correct angle, place the pipe back in the bender and adjust.
To make a back-to-back conduit bend, which results in a "U" shape, attach the bender to the conduit with the hook pointed toward the "up" free end. Apply pressure to the heel end of the bender with your foot, using the handle as a lever, until you reach a 90-degree position. Remove the conduit and check the angle. If there is slight spring-back, you may need to overbend.
An offset conduit bend changes the direction of the conduit at an angle while keeping a consistent distance to a wall, ceiling, or other surface. To make this bend, place the bender on the conduit facing the free end opposite the original bend. Line up the mark from the previous step with the start point symbol on the bender. Apply pressure to the heel end until you reach a 90-degree position, ensuring the new bend is on the same plane as the original.
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Frequently asked questions
There are several ways to straighten plastic pipe. One way is to use a pipe bender or a versatile pipe straightener. Another way is to apply heat to the pipe, either by running hot water through it, soaking the pipe in hot water, or using a hair dryer or heat gun. For pipes that have been coiled for a long time, leaving them unraveled in direct sunlight for a week or two can help straighten them.
Yes, running hot water through the pipe can help to straighten it. Connect one end of the pipe to a hot water source and run the water through while keeping the pipe laid out flat. Once the pipe is flat, run cold water through it to help it hold its shape.
In addition to using hot water, you can apply heat to the pipe with a hair dryer or a heat gun. Be cautious when using a heat gun, as too much heat can damage the pipe.
Plastic pipes that have been coiled for a long time may have a ""memory"" of their original shape and will try to spring back. Leaving the pipe in direct sunlight for several hours can help straighten it, and you can also try to soak the pipe in hot water for one to two hours.
