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Noua generatie tevi PE clasa MULTIPIPE si TWINPIPE

New and very high requirements for the construction of water supply networks, sewerage systems, gas grids and telecommunication networks contributed to very strong development of polyethylene (PE) as a raw material in the direction of improving its material properties, especially its resistance to crack propagation, which in turn, contributed to development of new types of pipes, which provide an appropriate level of protection, their long term durability and operating life. New types of raw materials and new designs of PE pipes, meet current market needs and contribute to more cost-effective technologies of their installation.

 

Why multilayer pipes?

  • Better protection
  • Increased safety
  • Longer life
  • Higher resistance to extreme mechanical loads
  • Possibility of using various methods of pipe installation
  • Lower investment costs
  • Shorter implementation period of the investment

 

Single-layer pipes

  • Piping installed according to international standards on a sand or fine gravel bed
  • Avoid any damage to the pipe surface, such as notches, cuts, grooves (a source of crack propagation)
  • Longer implementation period of the investment and higher costs

 

Multilayer pipes

  • Cost-effective installation in trenches without sand bedding
  • Much greater resistance to point loads, scratches and notches, and the resulting high resistance to crack propagation
  • Used in trenchless technologies without the risk of damaging the pipe
Situations resulting in crack propagation in PE pipes

1.  Scratches or cuts of the outer surface of the pipe that occurred before its installation (due to incorrect storage or transportation) or at the time of installation. General rule – the pipe with the outer surface damage of the depth greater than 10% of the wall thickness shall not be used for safety reasons. 
2.  Point loads – direct contact of a hard (sharp) object with the outer surface of the pipe (e.g. a stone), which is the cause of additional stresses in the pipe wall. As time passes, on the opposite side of the pipe wall due to the stresses from internal pressure, external pressure and the object, a crack starts to occur that propagates with the progress of time.

We introduced two types of double-layer polyethylene pipes to the production and commercial offer, MULTIPIPE and TWINPIPE. The MULTIPIPE pipes may be also produced in a version with a steel strip insert placed between the inner pipe and the protective pipe. This strip is used to locate the pipeline in the terrain and detect a possible lack of the pipeline continuity (pipe break). 

The MULTIPIPE and TWINPIPE pipes are designed for construction of water supply and pressure, vacuum and gravity sewage drainage systems and networks as well as protective pipes. The MULTIPIPE and TWINPIPE pipe networks may be installed in the ground without the use of bedding and backfill, using traditional and narrow trenches. The MULTIPIPE and TWINPIPE pipes may also be used for the construction and renovation of pipe networks by means of a trenchless method.

Methods of joining the MULTIPIPE and TWINPIPE pipe sections and fittings:

  • thermal butt welding,
  • welding using electrofusion couplings
  • mechanical connections using push-on joints and flanged joints designed for polyethylene pipes.

The TWINPIPE and MULTIPIPE pipes are designed to convey pressurized water and wastewater of the temperature of up to 20°C. When using pipes for conveying water of the temperature above 20°C (max. 40°C), the allowable operating is calculated from the equation: PFA = fT x fA x PN, where the pressure reduction coefficient is given in the table:

Coefficient fT as a function of temperature

Temperature, °C

20

30

40

Pressure reduction coefficient, fT

1,00

0,87

0,74

 

The TWINPIPE and MULTIPIPE pipes and fittings may also be used as a cable sheath of power cables, telecommunication lines and other ones, both indoors and outdoors.

According to the Hygienic Certificate the TWINPIPE pipes and fittings meet the hygienic requirements and may be used in systems and networks for the conveyance of drinking water.

Structural differences of polyethylene pipes:

MULTIPIPE double-layer pipe

 

Plastic material layers not bound molecularly 
material PE 80 or PE 100

TWINPIPEdouble-layer pipe

 

- Plastic material layers bound molecularly 
material:  PE100 / PE 100 RC

 

 

The difference between the MULTIPIPE and TWINPIPE pipe is that the TWINPIPE pipe is made of two layers of polyethylene bound molecularly to each other. This type of bond is not present in the case of MULTIPIPE pipes. Depending on the purpose, the layers are made of PE 80 or PE 100 polyethylene. For the TWINPIPE pipes, both layers are made of PE 100 polyethylene, however, the outer layer is made of PE 100 RC – plastic material resistant to crack propagation. For the manufacture of products we use PE 100 RC polyethylene of high resistance to slow growth of cracks and to point loads. 
In the case of a MULTIPIPE pipe, we are able to manufacture their version with an insert in the form of a steel strip to identify the pipeline and its continuity (detection technology). 

The physical properties of the polyethylene used for the production of the MULTIPIPE and TWINPIPE pipes shall be in accordance with the ones specified in the standard: PN EN 12201-1:2012.

Physical properties of the polyethylene PE 100 RC

The dimensions and tolerances of the TWINPIPE pipes should be in accordance with the standard PN-EN 12201-2:2004 whereas for the MULTIPIPE pipes these dimensional requirements refer to the internal pipe. The thickness of the outer layer of MULTIPIPE pipes depends on the application and agreements between the Manufacturer and a customer but it cannot be lower than the thickness specified in the table below

Property

Requirement

Testing method

FNCT Test (Full Notch Creep Test)

not damaged during the test

ISO 16770 
(testing parameters: 
4 N/mm2, 80°C, 2% Arkopal N-100, time > 8760 hours)

Point load test

not damaged during the test

Dr Nessel’s PLT test 
(testing parameters: 
4 N/mm2, 80°C, 2% Arkopal N-100, time > 8760 hours)

Resistance to slow growth crack propagation 
(Notch Test)

not damaged during the test

PN-EN ISO 13479:2009 
(parameters: SDR 11, pressure 9.2 bar, temp. 80°C, time > 8760 h)

Resistance to rapid crack propagation

stopped

ISO 13477:1997 
critical pressure: Pc ≥ 10 bar

Dimensions and tolerances

The dimensions and tolerances of the TWINPIPE pipes should be conforming to the PN-EN 12201-2:2004 or PN-EN 13244-2:2004 standard. In case of MULTIPIPE pipes these geometrical requirements refer to the internal pipe. The thickness of the outer layer of MULTIPIPE pipes depends on the intended use and agreements between the Manufacturer and the Customer bur it cannot be lower than specified in the table below:

 

Nominal diameter of pipe (mm)

90,110,125,140

160,180,200

225,250,280

315,355,400

Minimum wall thickness of the casing pipe (mm)

1,5

3,0

2,5

3,0

 

MULTIPIPE pipes

- Range: Ø90 – 450 mm 
- Material PE80 or PE100 
- SDR 11, SDR 17

 

Range of diameters 
(Ø of inner pipe / min. Ø of outer pipe)

PE100 SDR 11 PN 16 
(product index)

PE100 SDR 17 PN 10 
(product index)

90/95

419014309

419034309

110/115

419014311

419034311

125/131

419014312

419034312

140/146

419014313

419034313

160/167

419014314

419034314

180/187

419014315

419034315

200/207

419014316

419034316

225/233

419014317

419034317

250/258

419014318

419034318

280/288

419014319

419034319

315/324

419014320

419034320

355/364

419014326

419034326

400/409

419014321

419034321

 

TWINPIPE Pipes Ø180 – 800mm

Double-layer pipes for water supply SDR 11, Ø180-800, PE 100/PE100RC

 

180x16,4

200x18,2

225x20,5

250x22,7

280x25,4

315x28,6

355x32,2

400x36,3

450x40,9

500x45,4

560x50,8

630x57,2

Weight

8,35

10,3

13,04

16,04

20,11

25,47

32,32

41,04

51,99

64,14

80,36

101,81

Total

wall

thickness

16,4 +

1,8

18,2 +

2,0

20,5 +

2,2

22,7 +

2,4

25,4 +

2,7

28,6 +

3,0

32,2 +

3,4

36,3 +

3,8

40,9 +

4,2

45,4 +

4,7

50,8 +

5,2

57,2 +

5,9

Outer

layer

thickness

3,3

3,6

4,1

4,5

5,1

5,7

6,4

7,3

8,2

9,1

10,2

11,4

Inner

layer

thickness

13,1

14,6

16,4

18,2

20,3

22,9

25,8

29,0

32,7

36,3

40,6

45,8

 

Double-layer pipes for water supply SDR 17, Ø180-800, PE 100/PE100RC

 

180 x

10,7

200 x

11,9

225 x

13,4

250 x

14,8

280 x

16,6

315 x

18,7

355 x

21,1

400 x

23,7

450 x

26,7

500 x

29,7

560 x

33,2

630 x

37,4

710 x

42,1

800 x

47,4

Weight

5,65

9,68

8,85

10,85

13,63

17,26

24,96

27,77

35,18

43,47

54,45

68,98

87,52

111,00

Total

wall

thickness

10,7 +

1,2

11,9 +

1,3

13,4 +

1,5

14,8 +

1,6

16,6 +

1,8

18,7 +

2,0

21,1 +

2,3

23,7 +

2,5

26,7 +

2,8

29,7 +

3,1

33,2 +

3,5

37,4 +

3,9

42,1 +

4,4

47,4 +

4,9

Outer

layer

thickness

2,1

2,4

2,7

3,0

3,3

3,7

4,2

4,7

5,3

5,9

6,6

7,5

8,4

9,5

Inner

layer

thickness

8,6

9,5

10,7

11,8

13,3

15,0

16,9

19,0

21,4

23,8

26,6

29,9

33,7

37,9

 

 



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