Choose pipes for the installation of sanitary and heating systems

Choose pipes for the installation of sanitary and heating systems

When installing the water supply system and the pipes of the heating system, a material selection step precedes. It’s hard for an amateur to navigate a huge variety: both manufacturers and assembly companies have praised the material they work with. Let’s try to calculate with the help of an expert.

When choosing pipes for the arrangement of plumbing and heating, we must not take for granted the statements of manufacturers and sellers. It is necessary to understand which pipes are preferable in specific operating conditions depending on the economic possibilities. Thus, when installing a free-flow drainage system, plastic (polypropylene) pipes are used almost universally and justifiably, but in the water supply and heating systems of a cottage there is no such module of choice. Examine the properties of different pipes and determine the preferred areas of their application.

Which pipe is best to choose for home plumbing

In water systems, the transportable medium is pure water with a large amount of oxygen dissolved in it. In addition, some salts are possible. The pressure rarely exceeds line 5 and the temperature is + 60 ° C.

Water and copper pipes

From a technical, environmental and practical point of view, copper pipes are the most suitable for a water supply system. Copper is a natural material used by humans to transport and store water for thousands of years. This material is inert to drinking water and the oxygen that dissolves in it and is also bacteriologist – that is, it prevents the biological overgrowth of the pipes, preventing the growth of bacteria in them.

Copper pipes have smooth inner walls and are therefore less prone to salt deposition than steel. Capillary welding is commonly used to connect copper pipes, which gives the connection reliability comparable to the quality of professional crimping.

Plastic pipes and tubes made of metal-polymer (metal-plastic)

If you are not ready for large investments in advance, then plastic and metal pipes made of polymers can be used for water supply systems. The cheapest pipe is produced from polypropylene pipes, while for the hot water supply system (HWS) the use of reinforced pipes is recommended. Diffusion welding is used for their connections and installers must necessarily have the required qualifications, because even with slight overheating, a significant reduction of the diode is possible – until the connection is completely blocked. This creates a hidden flaw that is very difficult to detect.

Polyethylene + metal-plastic pipes

The intermediate position for price and reliability is occupied by cross-linked polyethylene (PEX) and metal-plastic (MP) pipes. Externally, they are very similar, but differ significantly in structure and properties.

The bearing base of PEX pipes is a rather solid wall of cross-linked polyethylene and for MPs it is a multilayer welded structure: PEX + glue + AI + glue + PEX or PEX + glue + AI + glue + PERT, where PERT is a grade of thermostable polyethylene can be welded. PEX pipes can also be reinforced with an aluminum (AI) layer, but they have this layer over the transfer pipe and not on its body, like metal-plastic.

Adjustment

Press fittings are recommended for connecting PEX and MP pipes, as they provide permanent connections which, according to the current SNiP, can be integrated into the body of construction structures. Threaded parts should only be used as a last resort and all connections should be available for maintenance as they require periodic tightening.

Accessories for PEX and MP pipes are expensive, their share can reach 50% of the system cost. Cross-linked polyethylene components do not have sealing rubber rings, which, of course, increases the overall durability of the system. High construction capacity reduces the risk of errors during installation due to the “human factor”, which increases the reliability of the system.

Steel pipes

Steel pipes, despite their strength, undergo intense corrosion due to oxygen dissolving in water and tend to exceed the salts due to the roughness of the walls.

 

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