In the market of building materials, a water pipe with a diameter of 25 mm is represented by two types: steel and plastic. The latter variety is divided into groups, which are based on the polymer from which the tubular products are made. The main purpose of pipes of this diameter is the organization of cold and hot water supply networks, as well as heating systems.
Steel pipes
The selection criteria depend mainly on the material from which the pipe sections are made. Therefore, it is necessary to conduct a comparative analysis of all plumbing products on the market.
On the market, steel pipes with a diameter of 25 mm are represented by two types that differ from each other in the production method:
- Cold deformed. These are products that belong to the category of “seamless”. They are produced in a rolling mill with further cold calibration.
- Electric welded, in which there is a seam.
The latter are divided into two groups: with a straight seam and a spiral. In the assortment with a spiral seam of pipes with a diameter of 25 mm in no. The minimum diameter here is 159 mm. If cold-deformed can be installed in water networks with high pressure, then electrowelded only in systems with moderate pressure.
Steel pipes differ from plastic ones in that they have a minimum coefficient of linear expansion, they easily tolerate quite serious mechanical stresses, changes in humidity and temperature. They will not be damaged by rodents. The method of connecting pipes to each other and to fittings is electric welding.
A separate category are water and gas pipes (VGP). They are considered the most popular in the category of steel pipes. Gas networks according to GOSTs can be carried out only from steel pipe products. Manufacturers offer galvanized models that guarantee a long service life due to the additionally applied protective layer.
Plastic pipes with a diameter of 25 mm
Pipes made of plastic with a diameter of 25 mm are represented by a small model range. They differ from each other in the material from which they are made. Hence the excellent technical and operational characteristics.
Propylene products belong to the class of thermoplastic and durable. Their distinctive characteristics:
- withstand short-term effects of temperature at + 100С;
- do not change their size and technical characteristics when interacting with chemically active substances (alkali, acid and salt);
- withstand large mechanical loads (pipes of this type can be laid in an open way).
Manufacturers offer two types of execution:
- ordinary;
- reinforced.
The first type is purely plastic pipes. They have their own classification, which is based on the pressure of the water flowing through the water supply network. The marking has a letter designation - "PN", and a digital designation of pressure.
Products of the PN10 or 16 brands are recommended for use in the water supply system, and PN20 or 25 in heating systems.
The second type is two layers of polymer, between which a reinforcing layer is laid. Usually this is aluminum foil or a mesh of aluminum wire. Manufacturers use fiberglass or composite mesh.
Polypropylene pipes are represented on the market by two types of execution: for cold and hot water. A blue line is drawn on the outer plane of the former, and a red line on the latter.
Prices for polypropylene plastic water pipes with a diameter of 25 mm depend on the class of the product. Brand PN10 costs 22 rubles. at the rate of one running meter. Price PN16 - 26 rubles.The cost of PN16 reinforced execution costs 62 rubles.
Polyvinyl Chloride (PVC) pipe sections are not widely used in water supply systems. The reason is the difficulty of connecting the elements of the water supply network.
To connect the PVC pipes, special fittings are used that are fastened together by a thread. The second connecting technology is cold welding, which uses a special adhesive composition.
We must pay tribute to the pipe material of this type for its high strength and neutrality to all chemicals.
The price of a PVC water pipe with a diameter of 25 mm is 220-250 rubles / meter.
Manufacturers offer two varieties polyethylene pipes: low and high pressure. The second ones with a diameter of 25 mm are not produced, because these products have reduced strength due to the low density of the plastic itself.
The former, on the contrary, have high density and strength. At the same time, HDPE pipes are very flexible. When it is necessary to carry out a branch or branch, they are laid, bending under the required bending radius - installation is carried out without the use of connecting fittings.
HDPE pipes produce only black. Some companies put a blue line on the surface, thereby indicating that these products can only be used when forming a cold water supply. Under the influence of high temperatures, the polyethylene softens, so it is not used in the hot water supply system or in heating networks.
According to GOST, polyethylene pipes with a diameter of 25 mm are produced with a wall thickness of 2 to 2.3 mm. The weight of one running meter is 0.12-0.16 kg. Pipes can withstand pressure up to 16 MPa.
High frost resistance can be added to the advantages of low-pressure polyethylene pipes, therefore, temporary water supply networks are constructed in the dachas from them, which are laid in an open way. They are not canned for the winter. There are two ways to connect water supply elements to each other:
- using couplings;
- by welding.
Experts give preference to the first as the simplest.
Prices per meter of HDPE water pipe with a diameter of 25 mm, depending on the wall thickness, range from 20 to 25 rubles per linear meter.
Products from crosslinked polyethylene have increased flexibility, so they are sold in bays. The uniqueness of this type of pipe lies in the fact that it can be used for laying not only cold water pipes. It easily tolerates high temperatures, therefore it is used in the organization of hot water supply and in heating systems. Cross-linked polyethylene material was especially popular in the formation of a system of underfloor heating.
Pipes withstand temperatures up to + 95 ° C, pressure up to 16 MPa. Bend at a radius of 10 cm. Guaranteed life of 50 years. Connection method - crimp couplings or press fittings. Price - within 100 rubles / m.
Metal-plastic pipes are classified as reinforced. They include aluminum foil. It is located in the middle of the product wall and is attached to two layers of plastic with a special adhesive composition, which is applied using hot technology. Plastic is a flexible material, so pipes are sold in bays.
Compared to a pipe made of cross-linked polyethylene, in which bending can be carried out under a radius of 10 cm, this parameter is 6 cm for metal-plastic. The remaining characteristics are almost the same:
- the maximum temperature that a metal-plastic pipe can withstand is + 95 ° C;
- pressure - 10 MPa;
- a small linear expansion, which provides a reinforcing layer - 0.81%;
- service life - 50 years;
- the price is about 100 rubles per linear meter.
Metal-plastic pipe products are rarely used in the formation of water supply networks, because they cost more than other models.In underfloor heating systems, they guarantee efficient operation and provide ease of installation.
