Learn how to join plastic pipes

Plastic pipes are used increasingly in plumbing. But before the distribution facilities in copper, with the necessary facilities were welding fittings, elbows, etc., and complications that it is entailed.

join plastic pipes

The use of polyethylene pipes has provided facilities, and few tools that easily connect the pipes. For drains have been always used the PVC pipe, these are facilities that do not have to withstand water pressure and therefore do not need very strong bonds.

Install polyethylene pipes

Carrying out a polyethylene installation requires knowledge of the characteristics of the fluid (nature, pressure, flow, temperature, etc.) in order to choose the appropriate material (PE, HDPE/HDPE or PERT) and thus define the appropriate family of fittings to install (compression, clip, etc.).

In distribution facilities with polyethylene pipes, professionals use some accessories that are pressed on the pipe to make the connections. With the help of a special machine, firmly fasten the compression on the pipe ring.

If we are going to join polyethylene pipe, it is not necessary to buy the pressing machine, since there are attachment fittings (elbows, T, etc.) with nuts that pressure, when tightening with the help of a wrench, firmly attached to the pipe.

PVC pipes

PVC pipes for drains used PVC fittings and stick with special glue. We will look for the right accessory to the diameter of the pipe and cut the area to be connected so that it is straight.

join pvc pipes

With fine grit sandpaper, we will sandpaper the bond areas ranging in touch and clean up of dust and grease with a cloth moistened with alcohol.

Once prepared unions, apply glue with a brush (that usually included) and let dry a few minutes, according to the manufacturer’s instructions. Once the glue is ready, we will unite the two sides without turning; introduce only one piece in the other and let dry at least 24 hours before using the pipe.


Consider these additional recommendations for optimal liquid solder bonding:

  • Have a trained professional for installation. Although if the person is interested in learning, they can be trained by taking workshops.
  • Make sure the ends to be joined are clean and dry, unless you are using glue for wet connections.
  • Liquid solder must be free of lumps.
  • Never dissolve the solder with any type of solution, it should be used as it comes in the can.
  • Liquid solder glues are flammable so avoid sources of ignition and work in ventilated areas.
  • Carry out the welding in the morning or in cool hours.
  • Do not leave the can uncovered because the content evaporates, storage must be in cool weather.
  • Check the expiration date. PVC glues generally last 2-3 years, while CPVC glues last 1-2 years.
  • Do not heat the tubes to shape it, it is advisable to use nipples or unions, because when they are heated the conditions and properties with which it was created are lost.


What is the difference between PVC and CPVC pipes?

PVC stands for poly (vinyl chloride). Its characteristics include that it is resistant to cracks and acids. CPVC, meanwhile, stands for chlorinated poly (vinyl chloride), unlike PVC, this material has one more molecule of chlorine. It is used in a similar way to PVC, but the main difference is that it resists high pressures and temperatures, it can withstand up to 80° C, ideal for hot water pipes.

What are the cons of using PVC pipes?

The use of PVC pipes is limited, since at high temperatures, this material can suffer alterations. Low temperatures also affect it negatively, causing great rigidity in the plastic, increasing its sensitivity to shocks.