Build Daily

Sanitary Engineering

December 12, 2017 00:15

As soldering polypropylene pipes

Polypropylene tubes has many advantages over other types of materials.They are not subject to corrosion and the formation of mold, have a high rate of wear and a wide temperature range hold liquids.Because plastic products are widely used in domestic and industrial construction and repair works.


  • Thermal resistance of polypropylene pipes
  • thermal elongation of polypropylene pipes
  • reinforced polypropylene pipes
  • Types of pipes and fittings
  • Tools Required
  • rules of operation of the soldering iron
  • Instructions soldering polypropylene pipes
  • few tips

pipes made of polypropylene with a specialized set of the soldering apparatus.Connecting plastic pipe with elements of metal water pipe connection is carried out by special items.To learn how to solder a pipe made of plastic, discussed below.

Thermal resistance of polypropylene pipes

For a better understanding of the rules of working with any kind of material, it is necessary to know the general characteristics and propertie

s of the material itself.The first characteristic of pipes made of plastic, which is worth paying attention to - heat resistance.Plastic products lose their solid properties at a temperature of 1400 ° C, this figure depends on the type of pipe.Manufacturers indicate their products maximum temperature range for which it is intended.On average, the figure is for the 950S is not reinforced pipes.


for heating systems and hot water supply pads should pay particular attention to the type of purchased pipes.High heat resistance demonstrate reinforced pipes that combine quality plastic and metal constructions.Another indicator, which pay attention to the selection of materials - maximum pressure in the pipe.All these figures are indicated by the manufacturer directly on the pipe.

thermal elongation of polypropylene pipes

thermal elongation - a measure of change in linear dimensions when heated.Direct and long section of the pipe is covered with the heat waves and sags.Installation of heating or hot water supply systems should not be performed on the slab to slab section of one pipe.Otherwise, there riser tension, this will lead to deformation of the pipe, and a lot of trouble.How to solder heating pipes, to avoid problems:

  • used to supply water pipes reinforcing coating, as has been said above.The coefficient of thermal extension of this product in 5 times lower than that of non-reinforced, moreover, above the allowable pressure value.
  • Use compensators - section of pipe bends in the shape of the letter "P".In this case, flexible plastic will remain straight under elongation as the legs will converge at the bend.For the installation of the heating system, experts recommend using both described method.


reinforced polypropylene pipes

reinforced pipes - are products with a rigid frame made of aluminum or fiberglass.Reinforcing aluminum layer is located outside or between the plastic layers.The layers are joined with a special adhesive.The thickness of the aluminum layer - 0.1-0.5 mm.Glass fiber reinforcement is done slightly different principle - a layer located only in the middle, and the pipe itself is a monolith, in which the layers are welded securely to one another.

presence of the reinforcing layer affects not only the characteristics of the pipe, but also on the method of its spikes.In general, the process of installation of reinforced pipes does not differ from the pads are not reinforced structures.There is only one caveat - the pipe with an external reinforcing layer of aluminum brazing trimmed before the special tool - shaver.Wired inside the product is trimmed milling cutter.

reinforced pipe is more expensive product without coverage because they have to perform the installation of cold running water is not advisable.With wire cold water perfectly cope conventional polypropylene pipes.


Types of pipes and fittings

pipes made of polypropylene are divided into 4 main categories:

  1. product with thin walls PN10 for underfloor heating and cold water supply systems.Pressure indicator - 1 MPa, the maximum temperature - 450C and 200C.
  2. PN16 product for heating systems, installation of low pressure value and the cold water supply systems.Pressure Indicator - 2 MPa, the ceiling on the temperature - 800C, internal reinforcement aluminum.
  3. PN20 universal product for laying hot and cold water.Pressure Indicator - 2 MPa, the upper temperature limit - 800S.
  4. product for laying hot and cold water PN25, internal reinforcement aluminum.Pressure indicator - 2.5 MPa.The upper temperature indicator - 950S.

To connect pipes made of polypropylene and steel products using fittings with chrome and brass inserts.The main types of fittings:

  1. solder joints for the same product and different diameters.
  2. Corners 45 and 90 degrees for the same product and different diameters.
  3. Corner triple tee for products of the same diameter.
  4. plug.
  5. Pike polypropylene.
  6. Cross.
  7. clutches combined with different types of thread - internal, external, and with collar nuts.
  8. Welded seat.
  9. corners 90 combined.
  10. Tees combined, external and internal threads, combined nut.
  11. Squares combined for mounting various devices.
  12. Cranes solder ball, with American, straight and angled.


Tools Required

For soldering pipes made of plastic using a specialized soldering equipment.For sale such a machine in any hardware store, prices from 100 EUR.The most simple mechanisms have a capacity of heating element 800 W, it is enough for the construction of communications in an apartment or private house.Professional soldering irons have a temperature setting adjustments up to a 1-5o C. In soldering quality power is not affected, it only determines the speed of the heating element to the desired temperature.


Standard soldering iron for pipes made of polypropylene has a complete nozzle diameter of 20, 25 and 32 mm.These dimensions are suitable for standard pipe, couplings and connections.Nozzles are part of the heating element has a sleeve which melts the outside of the pipe and mandrel to the inner surfaces joined materials.Well, if the nozzle have a Teflon coating, it protects them from the effects of the molten plastic, facilitates removal of the molten tube, increases the weld quality.

Soldering iron - is the main tool that is required for installation of polypropylene pipes, but apart from him for future reference:

  1. Roulette - measuring the required pipe sizes.
  2. Pencil - to mark the pipes and walls.
  3. Hacksaw - in the absence of a special knife for plastic pipes.
  4. sharp knife - for chamfering the pipe during installation.
  5. Building level.
  6. Sheymer pipe reinforced outside.
  7. Planer for reinforced inside the tubes.

Particular attention should be paid to cutting the pipes before installation.The best tool for this is the special steel of high quality scissors.With their help, the pipe are cut exactly at the angle of 90 degrees.This saves time during installation and makes the process easier.Often manufacturers introduce such packaging scissors soldering pipes, because when you buy a soldering iron should look at the contents of the box.


Operating Rules soldering

  1. Soldering iron set on a flat surface.Special keys fixed nozzle diameters needed.The nozzle, which will be necessary for soldering on a wall, set the edge.
  2. Individual parts of the pipeline are collected on the establishment of steady soldering iron.When assembling the chains on the wall convenient to carry out the work with an assistant.
  3. work begins only after full heating soldering iron.For heating up to 260 ° it takes about 10-15 minutes.More precisely, the figure specified in the instructions to the machine.
  4. Soldering is not disconnected from the network throughout the installation process.
  5. two mating parts are heated simultaneously.
  6. Remains plastic nozzle is removed immediately after soldering using a canvas cloth.Clean the cooled nozzle is not allowed.


Instructions soldering polypropylene pipes

  1. Included soldering machine to warm up.Standard mechanisms are two indicators - the thermostat and turn on the machine.The indicators do not go out in the heat of the soldering iron, after 10-15 minutes the thermostat light goes out.This indicates that the soldering iron is hot and ready to go.
  2. Soldering consume more energy during the first activation, the nozzle is often heated over the required temperature.Therefore it is advisable to wait for the re-enable and disable the thermostat display, and then get to work.
  3. Measure out a piece of pipe to length.The length is taken with a reserve, accounted for the nozzle and the fitting depth.
  4. a measured piece of pipe is cut with special scissors or a hacksaw.
  5. select a suitable size fitting - its inner diameter is not heated as to be wider than the outside diameter of the pipe.
  6. wipe the dust flare fitting and the outer part of the pipe, degreased with soap and water or alcohol and dried.
  7. details are set on the soldering iron tip.The tube is inserted into the nozzle sleeve and the fitting dresses on the mandrel.

details on soldering iron aged necessary for their diameter and width of the time.Determine the value by using the table:

Pipe diameter, mm Belt Width Heating time, sec Connection Time, sec time to cool spikes, mines
20 14-16 6 4 2
25 15-18 7 4 2
32 16-21 8 6 4
40 18-22 12 6 4
50 20-25 18 6 4
63 24-28 24 8 6

heating time given in the table based on room temperature - about 200C.At lower or higher performance time, respectively, is increased or decreased.Perform soldering at a temperature of 00C is prohibited.

  1. details removed from soldering and connected to each other without turning on an axis.This is done with a little pressure.The tube is inserted into the fitting to its full depth.Compounds becomes reliable after complete hardening plastic.This value is indicated in the table above.
  2. If the edges of the socket formed a continuous influx of a roller over the entire circumference, the connection is made correctly.
  3. During incubation period of cooling pipes are not permitted twist or bend it.If the connection has an angle or offset, it must be cut and re-execute.Details describes how to solder pipe, video at the end.

Several different process spikes reinforced pipes:

  1. From the outside tube chamfered, shaver trimmed reinforcement.
  2. If the tube is reinforced with aluminum top, it just put in a sweep and make a couple of turns.
  3. If an internal reinforcement, the reinforcing layer is firmly pressed against the mopping-planer and crank.
  4. Then the process repeats spike not reinforced pipes, which has already been described above.

few tips

  1. To learn how to solder a pipe made of polypropylene, it is necessary to understand that in this process the most important thing - to act quickly and confidently and observe the ratio of parts.If soldering pipes for the first time, it is advisable to perform a few test compounds.To control the quality of the performed spikes, cut along the control sample.
  2. During the work, pay special attention to corners, tees and valves.Pens crane must be free to move to any position and does not rest on the pipe.It is also necessary to carry out safety as work is carried out at high temperatures, using a plastic material, which when heated releases hazardous vapors.
  3. Chamfering the pipe necessary, it must also be removed and the inside of the fitting.Otherwise, the softened plastic during soldering will be battened down, the compound will be less durable.
  4. pipe inserted into the fitting until it stops.By fitting pipe is welded along its entire length and end.Especially important this time for products with an inner reinforcing layer.
  5. nozzles soldering iron with Teflon can not be cleaned from the remnants of plastic coated with metal objects.Remove the remains of polypropylene must be coarse cloth with a heated nozzle.