How to solder polypropylene pipes
Do It Yourself Educational Program / / December 19, 2019
1. Prepare materials and tools
- pipes;
- fitting;
- napkins;
- gloves;
- soldering;
- Pipe scissors;
- roulette;
- pencil;
- level;
- isopropyl alcohol.
2. Make a pipeline circuit
Compound polypropylene pipes is relatively straightforward, but - as with any other structure - before starting to prepare a desirable exemplary mounting scheme.
Sketch drawing on paper with an arrangement of tapping points, valves, and other relevant details. So you can immediately estimate the length of the pipe, as well as to determine the location, type and number of required fittings.
Since the compound is heated both ends of the pipeline, it is important for the convenience of mounting, so that one of them remained free. Part of pipe fittings can be assembled on the table, and then set in the right place, doing the only one joint. All this will help provide a circuit assembly.
3. Prepare the soldering iron
Generally, the device is properly termed "welding machine». Process polypropylene compound takes place without the use of solder and therefore - a welding instead of brazing. We will use both terms.
Install the platform soldering required diameter nozzles and secure the screw with a wrench. If you are working with several pipe sizes - use an extra pair of sleeves.
Set the heating temperature of 260 ° C and switch to the network. On heating require 10-20 minutes. About ready to use report LED. For about 5 minutes to wait before welding the first joint.
When heated polypropylene allocated noxious fumes and smoke, which is better not to inhale. Therefore, while the ventilated room.
4. Make markup
Till soldering Iron heats, prepare the pipe and fittings. For quality welding they should be included at each other strictly on the certain depth. Insufficient immersion will lead to a bad connection, and excessive - reduce or completely clog the flow section of extruded plastic. Here are recommended by most manufacturers values for the most common sizes:
As you can see, soldering depth depends on the diameter of pipes and fittings.
To avoid mistakes, measure the desired length of the pipe, taking into account allowance for joint and put pencil hyphen. Then, at the right distance from this mark, draw one more line - it will serve as a reference point during welding.
For example, we need to connect the area and tee Heating system. The distance between them is 270 mm. For fittings 25 mm diameter solder depth - 18 mm, then add 36 more to 270 mm (18 per side). The result is 306 mm - such necessary piece of pipe cut off.
5. Cut the pipe
Cutting polypropylene uses special scissors, which are also called cutter. They make it easy to cut a thick-walled tube and get smooth edges without burrs.
Install a pair of scissors is strictly perpendicular to the tube and align the blade with the first label. Hold the tube with one hand, press the scissors handle as long as the item is not completely cut the.
It is important to get a smooth end to trumpet uniformly it entered into the fitting and the junction equally across the entire diameter. If the oblique cut, then too deep bulging portion comes off and the molten polypropylene is pressed out by reducing the internal diameter of the fitting.
If the region gets rough and allows the stock, it is better to cut off again. If the length of the butt - and then align the end of removing all the excess with a sharp knife.
6. degrease parts
According to the instructions of manufacturers of welded parts degreasing relies for secure connections. And while many master ignore this and are limited only by wiping with a cloth pipes, we recommend sticking technology.
Clean the pipes of any debris. Pour out the remaining water and wipe thoroughly with a tissue or dry toilet paper. Treat the surface of the fittings and pipes cloth soaked in isopropyl alcohol.
The same alcohol is easily erased all the inscriptions on the pipes and make them more aesthetic appearance.
7. Heat pipe and fitting
When working with a hot soldering iron there is the risk of getting serious burnsSo be sure to wear protective gloves. Details of various sizes to warm for a certain time. The larger the diameter - the longer.
For reliable connection polypropylene important not to overheat, otherwise the material will become fluid, and block the melt inside the fitting.
Insert the respective first handpiece fitting sleeve, then pipe. Pushing parts, do not turn them around its axis and tilt. The tube insert to a depth previously marked, as long as the molten polypropylene does not reach the pencil dashes. Only then shall ye put time.
All these data are valid for operations at an ambient temperature of about 20 ° C. If the room cooler 5 ° C, the heating time is increased by about twice.
8. Weld seam
Not turning or tilting, quickly remove the nozzle, first tube and then fitting and connect the two parts in position relative to each other. Do not fuss, but do not loiter - you have in stock 4-6 seconds.
Hold the pipe and fitting is fixedly about 5 seconds to joint locks. At this point, turn the connection is allowed no more than 10 degrees to adjust its position.
Full cooling time, after which it is possible to load the welding site is between 2 to 4 minutes.
Residues polypropylene nozzle easily removed with a paper towel until the hot soldering iron. If you have to clean the cooled sleeves - there is a risk to damage the Teflon coating.
9. Check the connection
Determine the welding quality can be uniform over a small influx on the end fitting. If it is not, it is possible that the joint sub cooled and tightness will be called into question. If too great an influx - pipe is likely to overheat, and it oplavilas inside, partially and completely blocking the orifice.
For those who first has to do with welding polypropylene, it is not superfluous to first practice and some training to weld the joints. To study better to direct couplings. Unlike other parts and fittings of complex shape, they are easy to inspect the well after soldering, not only outside but inside.
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