Build Daily


September 08, 2016 23:03

Polypropylene pipes for heating specifications

Polypropylene pipes for heating technical characteristics which may differ among themselves on the market today are presented in a very wide range.Their popularity is high, and there is a tendency to its continued growth.This demand is due to the convenience of installation and the breadth of their application: depending on the type, they are used to the usual water pipe installation to create heating circuits.They certainly do not have the flexibility expressed by metal pipes, but if necessary, they can be given a smooth bend.

Polypropylene pipes for heating specifications

Polypropylene pipes for heating specifications

Species polypropylene pipes - many, and each of them has its own scope.To understand what type of the most suitable for the heating circuit, it is necessary to get acquainted with their structure and characteristics.

Criteria for selection of polypropylene pipes for heating

Article Contents

  • 1 Criteria for selection of polypropylene pipes for heating
  • 2 Varieties of polypropylene pipes
  • 3 reinforced polypropylene pipes
  • 4 Installation of polypropylene pipes
  • 5 main motives to choose for heating circuit polypropylene pipes
    • 5.1 Video: useful information on choosing polypropylene pipes and accessories

heating will last as long as possible without crashing, and repair,if the right components that meet a number of specific requirements will be selected for it.

For heating systems suitable not all varieties of polypropylene pipes

For heating systems suitable not all varieties of polypropylene pipes

all elements and components of the heating system during normal operation even quite experienced enough serious load.This, of course, very amplitude changes in temperature, pressure surges, which are exacerbated by aggressive chemical effects of poor quality coolant, especially if the home (apartment) system is connected to the central heating.

Polypropylene pipes - material rather ambiguous, and is represented in the sale of a variety of types of differing wall thickness, the presence or absence of reinforcement, quality material, resistant to temperature, and pressure loads, UV exposure, the characteristics of linear expansion.Therefore, intending to upgrade the heating system circuit, you must really know exactly what qualities should have pipe manufacturing material.

to install the heating system must be selected polypropylene pipes that meet the following basic characteristics:

  • Since the standard coolant temperature in the central heating system is typically 70 ÷ 75 degrees, but sometimes it can be even more pipes it is necessary to choose fromthis calculation to their thermal stability has a certain margin, to 90 ÷ 95 degrees heat.Pipes must not deform, bend, "float" at high temperature, their thermal expansion must not overstep certain bounds.
The unfortunate consequences of neglecting the rules of selection of polypropylene pipes for the heating circuit

sad consequences of neglecting the rules of selection of polypropylene pipes for the heating circuit

  • addition to elevated temperatures in the central heating system having uncontrolled pressure surges and water hammer.They are especially likely to occur during the test events before the start of the heating season.Hence the conclusion - the pipes must steadfastly resist high baric load.
  • material from which pipes are made, must be inert to the aggressive agents which may be part of the coolant.The walls must not corrode, and polypropylene fully possesses these qualities, so it's perfect for heating systems.
  • To achieve the normal circulation of the coolant along the contour, without creating it mud tubes, the inner surface of the pipe must have a perfect smoothness and store it in its original condition for as long as possible.Unlike metal pipes, polypropylene will not be eroded by any of the known types of corrosion, and its interior walls are not misaligned, which usually accumulates dirt and limescale.
  • coefficient of thermal expansion of the pipe material for the heating system must be minimal, or by heating in the long straight sections of the pipe will start to sag.
  • Duration of operation pipe must be at measures that are not below the terms of service for which the other elements of the heating system calculated.
  • would seem insignificant feature, but it should also be borne in mind.When the coolant flows through the pipes, if they have an uneven inner surface can be created noise inconspicuous like at first but gradually causing irritation.Polypropylene is capable of providing a liquid circulation is practically noiseless, unlike metal, as polymer pipes strong turbulence is created, and hence the resonant sound.
  • contour of polypropylene pipes is always more aesthetic than metal, and does not require periodic staining.

Timely polypropylene pipes are manufactured using modern production technologies of plastic and composite materials, and additional equipment of some species reinforcement makes them ideal for heating systems.For example, polypropylene pipes for contacting the hot water produced in a multilayer embodiments, the reinforcing layer, which greatly reduces the thermal expansion of the wall and makes more durable.

Since the duration of trouble-free operation and the quality of polypropylene pipes for heating and hot water systems depends on the composition of materials from which they are made, should consider their different options.

Varieties of polypropylene pipes

Polypropylene (accepted international designation - PP have long been used for the manufacture of pipes as the base material, however, only the development of modern technology made it possible to obtain such products, which can be used for hot water supply and.heating.

itself polypropylene differs pronounced inertness to chemical attack possible liquid coolant medium. However, the heat resistance and durability of various types can vary considerably among themselves.

for pipes made of this material are divided into three main types, have their own symbols:

PP -H are only for cold water

PP-H are only for cold water

  • PP-H - is the first type of polypropylene pipes, inert to chemical attack, but not resistant to high temperatures.Therefore, they are designed for cold water supply, sewerage, drainage, ventilation and other applications where elevated temperatures are not assumed.Very often, such a kind of pipe is the prevailing industrial production lines, as it has a high resistance to increased internal pressure.
Диапазон возможного применения труб РР-В - несколько шире, но для отопления они все равно "слабоваты"

possible use pipe band of PP-B - slightly wider, but for heating, they still "rather weak»

  • PP-B - this is the second type of polypropylene pipes, which has all the same advantages of the PP-Hbut, in addition, it has the ability to withstand thermal stresses low amplitude.Therefore, they can be installed on certain main areas of "warm floor" systems.And also in the hot-water supply circuits, provided that the water or coolant is not heated above 50 degrees.

Nevertheless, the main scope of application of PP-B - other.In most cases such tubes are to sewer systems, since the material of which they are made, has a sufficient degree for the area in toughness and heat resistance.

For heating systems only RRR - pipe fit fully

For heating systems fully fit only RRR-pipe

  • RRRC, RRR or PP-3 - this is the most perfect type of pipes used in the hot water and heating systems, ie where the temperaturecan exceed 50 degrees, and there is a possibility of high compression loads.Increased heat resistance and mechanical strength is achieved through a special manufacturing technology, in which during the synthesis of propylene in a molecular lattice are introduced ethylene molecule.

RRR - pipes, which are most widely used in the domestic environment, as they have expressed resistance to internal pressure and temperature changes.

Polypropylene Pipes (RRR), used in a domestic environment, in turn, are divided into several types, depending on the resistance to stress baric: PN -25;PN -20;PN -16;PN -10.Their main characteristics are shown in the table:

type of polypropylene pipes Nominal working pressure Scope of use pipes
MPa technical atmospheres (kgf / s²)
PN -10 1 10.21 Eyeliner to the outline of a "warm floor", in which the coolant system has a temperature of no higher than 45? C, or cold water.
This type of pipe is designed for the pressure in the system is not more than 1 MPa.
He is the most affordable because of its rather low performance.
PN -16 1.6 16.32 hot and cold water with a temperature not exceeding 60 ° C and a pressure of not more than 1.6 MPa.
PN -20 2 20.40 hot and cold water in the autonomous system with low pressure and lack of water hammer.
coolant temperature for this type of product should not exceed 80 ° C and a pressure of 2.0 MPa.
PN -25 2.5 25.49 hot water and heating with coolant up to 90 ÷ 95˚S, including in the central heating system.
pressure to which they are rated at 2.5 MPa.

Each of the types of pipes produced in a fairly wide range of diameters, internal and external, from which depends on the thickness of the walls

outer diameter, mm
PN -10 PN -16 PN -20 PN -25
Inner Ø mm Thickness
mm Inner Ø mm Thickness
mm Inner Ø mm Thickness
wall mm
Inner Ø mm thickness
wall mm
16 - - 11.6 2.2 10.6 2.7 - -
20 16.2 1.9 14.4 2.8 13.2 3.4 13.2 3.4
25 20.4 2.3 18 3.5 16.6 4.2 16.6 4.2
32 26 3 23 4.4 21.2 5.4 21.2 3
40 32.6 3.7 28.8 5.5 26.6 6.7 26.6 3.7
50 40.8 4.6 36.2 6.9 33.2 8.4 33.2 4.6
63 51.4 5.8 45.6 8.4 42 10.5 42 5.8
75 61.2 6.9 54.2 10.3 50 12.5 50 6.9
90 73.6 8.2 65 12.3 60 15 - -
110 90 10 79.6 15.1 73.2 18.4 - -

Naturally, the diameters and wall thicknesses directly affect the stability of the pipes to the temperatures and pressures that, in principle, prejudice and the duration of their possible use in various conditions:

coolant temperature? C Lifetime, years tube type
PN -10 PN -16 PN -20 PN -25
Permissible excess pressure (kgf / cm²)
20 10 13.5 21.7 21.7 33.9
25 13.2 21.1 26.4 33
50 12.9 20.7 25.9 32.3
30 10 11.7 18.8 23.5 9.3
25 11.3 18.1 22.7 28.3
50 11.1 17.7 22.1 27.7
40 10 10.1 16.2 20.3 25.3
25 9.7 15.6 19.5 24.3
50 9.2 14.7 18.4 23
50 10 13.9 17.3 23.5 21.7
25 8 12.8 16 20
50 7.3 11.7 14.7 18.3
60 10 7.2 11.5 14.4 18
25 6.1 9.8 12.3 15.3
50 5.5 8.7 10.9 13.7
70 10 5.3 8.5 10.7 13.3
25 4.5 7.3 9.1 11.9
30 4.4 7 8.8 11
50 4.3 6.8 8.5 10.7
80 5 4.3 6.9 8.7 10.8
10 3.9 6.3 7.9 9.8
25 3.7 5.9 7.5 9.2
95 1 3.9 6.7 7.6 8.5
5 2.8 4.4 5.4 6.1

datain the tables - is the result of lengthy testing activities pipes in various conditions that can even theoretically occur during their operation, so you should take them into service in the process of selecting the desired material.

Polypropylene pipes may have a different color, but when they are selected it is not necessary to pay special attention to (possible only from an aesthetic point of view) as the external color does not determine the characteristics of the product and does not affect their quality.

on the surface of some of the pipes can be applied to the red or blue bar - it serves a specific purpose signaling device for a particular type.Thus, the blue color is applied to the cold water supply pipe, and red indicates products ability to withstand elevated temperatures in the heating system or heating circuit.

By purchasing the pipe , be sure to pay attention to their labeling

purchasing pipe, be sure to pay attention to their labeling

On the tube, in addition to the color bar to apply a literal mark, which tells about the characteristics and intended them to be installed in some water or heating system, and it also must be investigatedAttention.Meaning marking indicators as explained in the tables.