Water supply

Pipes for water supply - the types and characteristics, methods of thermal insulation of pipelines

Selection of pipes is very large and many peoplethe question arises - what is better for the water supply pipe? To determine this diversity, the following parameters must be taken into account - the temperature, the nature of the environment, the required durability, the pressure in the water pipes, as well as their financial capacity. After reading this article, everyone can himself choose the most suitable option for him. Conventionally, pipes for water supply are divided into 3 groups: metal-polymer and metal.

Content

  • Metal pipes: pros, cons
    • Standard steel pipe
    • Stainless Steel Pipes
    • Copper pipes for water supply

  • The era of plastic pipes
    • Generation 1 - pipe PVC (polyvinyl chloride)
    • Generation 2 - polyethylene pipes for water supply
    • 3 generations - polypropylene pipes

  • Metal-pipes - the symbiosis of the advantages of
  • The warm water?

Metal pipes: pros, cons

Their common advantages are high strength and "reference oxygen barrier."

Standard steel pipe

Steel pipes

Steel pipes are reliable but not protected from corrosion

The main advantages:

  • Availability;
  • The relative cheapness;
  • High strength.

The main disadvantages:

  • The absence of protection against internal and external corrosion;
  • The high labor intensity of assembly.

As a result - the inner diameter of overgrowing, leaks, rusty water, etc. Steel pipes according to SNIP must be changed every 25 years.

Installation is gas or electric welding, as well as using standard threaded connectors with seals (hemp, sealing and so on. N.).

Stainless Steel Pipes

The main advantages:

  • Beauty;
  • Reliability.

The main disadvantage:

  • High price;
  • The high cost of installation.

As a consequence of such pipes are not in high demand.

Copper pipes for water supply

Copper pipe and fittings

Copper pipes and fittings are durable, but do not apply to water systems that supply water with high acidity

The main advantages:

  • Beauty;
  • Reliability;
  • Durability;
  • The ability to withstand any temperature hot water;
  • Resistance to corrosion of chlorine and ozone;
  • High plasticity of the material. The pipes are not only susceptible to a change in shape, but can not become brittle at low temperatures;
  • Long term (from fifty to one hundred years old), trouble-free operation;
  • Maintain a single freezing and in multiple amount of damage is minimal.

The main disadvantages:

  • Not recommended for use in systems with excess acid with water, with a plurality of solid or solids with high water flow rate;
  • Installation is a high-temperature capillary soldering, screwed or press-fitting.

The era of plastic pipes

At present, there is a consistent trend of growth in demand for these pipes. This is due to the following indisputable advantages of polymer materials:

  • Corrosion resistance;
  • Low weight;
  • Absence of deposits on the walls;
  • Small pressure loss from a small friction;
  • Not afraid of stray currents;
  • Resistant to many chemicals;
  • Low thermal conductivity.

Disadvantages:

  • The oxygen permeability;
  • Intolerance to direct sunlight;
  • Loss of strength depending on the load and time;
  • The inapplicability of systems fire line;
  • It requires special tools for mounting and welding equipment;
  • We need protection from accidental damage (including rodent).

In the domestic construction market offer a plastic pipe 3 generations:

Generation 1 - pipe PVC (polyvinyl chloride)

PVC Pipes

PVC pipes are cheap and practical

The main advantages:

  • high strength;
  • Chemical resistance;
  • Resistance to abrasion.

The main disadvantages:

  • Increased toxicity;
  • Flammability.

In European countries such pipes for cold water does not practically used. There they are used mainly in the domestic sewage systems.

Generation 2 - polyethylene pipes for water supply

Polyethylene pipes

Polyethylene pipes are mainly used for the organization of systems of cold water supply

Industry produces 2 types of polyethylene: high pressure LDPE and HDPE low pressure. HDPE pipes for water supply are an excellent alternative to traditional metal pipes for water supply. This highly technical solution to the current problems on the construction of water pipelines. They can be easily connected to the pipes of any other materials. The cost of such a small pipe.

The main advantages of polyethylene pipes:

  • Resistance to low temperatures down to -20 ° C.

The main disadvantages:

  • At high temperature strength polyethylene decreases and it becomes plastic-viscous;
  • From direct sunlight the material is rapidly aging.

As a consequence of these pipes for hot water supply is not used.

Pipes of "cross-linked" polyethylene

The main advantages:

  • Much strength;
  • A higher resistance to temperature influences.

The main disadvantages:

  • Unsuitable for welding.

As a consequence of such pipes can be used for hot water supply.

3 generations - polypropylene pipes

Polypropylene pipes

Polypropylene pipes - a combination of the best technical characteristics

  • Physical durability;
  • Painting is not required;
  • The lower the thermal conductivity;
  • Low weight;
  • The absence of electrical conductivity;
  • The absence of chemical corrosion;
  • Easy to install - installation of pipes is performed in two to four times faster than steel;
  • Not prone to lime, to solvents, acids or other chemicals;
  • Chemical resistance. Polypropylene does not affect the water quality;
  • Acoustic insulation (due to water leakage and noise resonance occurs not from water hammer).
The unit composition pipe

The unit composition pipe

Metal-pipes - the symbiosis of the advantages of

They combine the best qualities of tubes made of plastic and metal, but at the same time deprived of most of their disadvantages. They consist of several layers:

  • External - cross-linked polyethylene, resistant to UV rays;
  • Middle - aluminum pipe with wall thickness of 0.2-2 mm, welded along the length of lap or butt;
  • Inner layer.

Such pipes can be bent, after which theykeep them imparted shape. And with such high strength pipe can withstand pressures of up to twenty MPa and the temperature to 95 ° C. Diameter range of these products is quite large - from 14 to 110 mm.

Thermal insulation of pipes

Expanded polystyrene - the most demanded material for thermal insulation of water pipes

The warm water?

Fiberglass insulation is used toinsulation of metal pipes. When glass wool insulation requires an additional external insulator - rolled material, for example, glass or roofing material.

Expanded polystyrene (styrofoam) morecommon material for insulation of domestic water pipes. The insulated shell of polystyrene is used as the outer cover, and without it, is optional stacking trays. Using foam designed for reusable application.

Basalt insulation areCylinders of thermal insulation material. The obvious advantage is - convenience cylinder assembly. The downside is that their value is not the lowest. Protective coating layers are made of foil insulating, roofing paper or glassine.

All modern thermal insulation materialsinsulation of water pipes have a common principle of action - acts as a thermal insulator air, which is located in a space heater. Because the choice of insulation depends only on the location of pipes and installation convenience.

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