Main types and types- Overview + Video

Main types and types- Overview + Video Parts used for installation, piping systems are called fittings. The article talks about pipe fittings. Installation methods and specifications are indicated. The main types of parts for connection and their types are given. The materials for the manufacture of fittings are indicated and for which pipes they are suitable.

How the details are attached in the section of each view.

What are fittings?

General information

They are pipe section connectors using various connection methods:

Using fittings for pipelines, the following actions are performed:

  • Extending the pipeline route.

  • The route forks into several sections.
  • Installation of piping.
  • Fitting pipes of different diameters.

Main types of fittings

Connecting parts are divided according to materials of manufacture according to the ratio to the materials of pipelines and the way they are connected to pipes.

Material for making connectors

  • Cast iron parts, used for steel pipelines in heating and water supply systems, for drainage.

    They are highly durable, heat-resistant at high temperatures, do not react to sudden changes in ambient temperatures, long service life, and are poorly susceptible to corrosion. They do not withstand freezing of the environment, deformation with destruction is possible with prolonged exposure. They are produced with diameters from 15 mm to 100 mm.

  • Metal fittings are suitable for installation in heat supply, water conduits and pipelines for supplying non-aggressive liquids and natural gas. High-strength materials, withstand heating of the medium to the formation of steam, withstand sudden temperature changes.

    With prolonged exposure to low temperatures, under the influence of ice of the frozen internal environment, deformation and destruction are possible. The sizes are produced in diameters from 10 mm to 1000 mm

Important! Metal connectors are made from copper, brass, ordinary steel, stainless steel, pressed from metal powder without alloy. Surfaces are plated with chrome, copper, zinc and chromium alloys for corrosion protection.

  • Fittings made of polypropylene , used for installation of heating and cold water supply and hot water supply systems through polypropylene pipelines, metal-plastic pipes, polypropylene pipes pierced. There are restrictions on high temperature, it allows liquid to pass through no higher than 90 0 C.

    In this case, there is a slight expansion of the material. Withstand temperature extremes. Suitable for use in pipelines with aggressive media, except for concentrated acids. Long service life if used correctly.

Degrades when exposed to ultraviolet rays.

Produced in diameters by external dimensions from 20mm to 160mm.

  • Combined polypropylene fittings with molded steel parts. The inserts are used for cutting threads on them. Used to connect pipelines and system parts made of different materials.
  • Polyethylene parts are used for heating systems, cold water supply and hot water supply, in sewage systems, for passing all types of aggressive media, for supplying gaseous substances.

    Long service life if used correctly. Average strength. Elastic material. Minor changes in size occur with temperature drops with a further return to the original characteristics.

Available in outer diameters from 10 mm to 1600 mm.

Ways of connecting fittings

  • Main types and types- Overview + Video Connecting fittings with pressing is available for parts for reinforced-plastic pipelines. It is carried out using a special apparatus through push-sleeves. Part of this function belongs to polyethylene connectors by compressing tapered rings.
  • Threaded connection of parts with pipelines or equipment that is part of the system. This connection is available for cast iron, steel and polyethylene fittings.

    In part, this function belongs to the combined parts.

  • Welded method of pipes and fittings between themselves is used for parts made of cast iron, plain steel, copper, stainless steel. Other metals are not suitable for welding.

Important! For different metals, specially designed electrodes are used, taking into account the specifics of the material. Alternatively, gas welding is used for steel fittings.

  • Soldering of connectors is performed for fittings made of polypropylene and polyethylene. It is produced using special electrical devices.

Help! For fittings with large diameters from 180 mm to 1600 mm. A self-welded system has been developed by means of a pressed-in copper spiral on the inner surface of the part and electrode outputs. An electric current is supplied to it and under the action of heating the spiral, the process of soldering of materials occurs.

Basic types of fittings

  • Corner bends. Differences in angle 45 0 and 90 0 . By special order, polyethylene bends are made in accordance with the design dimensions. The diameters correspond to the technical characteristics of the pipes.
  • Tees , details are used to connect pipelines in the whole volume of the entire system.

    They are produced with the same and different bend diameters.

The diameters correspond to the technical characteristics of the pipes.

  • Crosspieces are made of cast iron, steel and polyethylene. They are used for the construction of networks from appropriate materials.The diameters correspond to the technical characteristics of the pipes.

  • Main types and types- Overview + Video Couplings are made for all types of pipelines from appropriate materials. The diameters correspond to the technical characteristics of the pipes.
  • Transition in diameters, made of materials in accordance with the pipe material. It is used for smooth transition of different pipe diameters in the system.
  • Combined couplings , made of polypropylene and a metal insert with an internal thread or an external thread.

    They are used to connect a plastic pipe to a steel pipe. The diameters correspond to the technical characteristics of the pipes.

  • Couplings combined with a split body . Made of polypropylene and metal. It is used to connect fixed parts of the pipeline made of different materials.


The world of pipe fittings is represented by a large variety of parts options. They are produced for a narrow brand line and have no analogues for replacement, and, as is customary, universal designs are produced. They are suitable for different system models.

There is a section of special fittings with increased technical properties. They withstand high pressure and are made from metal alloys with composite additives.

( 1 grade, average 5 of 5 )