COMPOSITE CHARACTERISTICS

With the PP-R/Al system, the linear expansion due to temperature change is reduced by at least 75 % when compared to standard PP-R pipes and hence has the following characteristics.

  • The coefficient of linear expansion is almost identical to that of metal pipes.

  • In comparison with other plastic pipe systems the supporting clamp intervals can be increased leading to a reduction in the number of mounting clips being used.

  • Optimum cost-performance ratio in comparison to metal pipes.

  • Lower weight than equivalent metal pipes.

  • High impact strength.

 

Expansion of PPR Composite Pipes

The expansion of composite pipe is 75% less than the normal PPR pipe, as noted in the below table:

  Longitudinal Expansion: PPR Composite Pipes

 Pipe length in meters

l (m)

 Temperature difference ∆ t (k)

 10

20

30

40

50

60

70

80

 0.1

 0.03

0.06 

 0.09

0.12 

 0.15

0.18 

 0.21

0.24 

 0.2

 0.06

 0.12

 0.18

 0.24

 0.30

 0.36

 0.42

 0.48

 0.3

 0.09

  0.18

 0.27

 0.36

 0.45

 0.54

 0.63

 0.72

 0.4

 0.12

 0.24

 0.36

 0.48

 0.60

 0.72

 0.84

 0.96

 0.5

 0.15

 0.30

 0.45

 0.60

 0.75

 0.90

 1.05

 1.20

 0.6

 0.18

 0.36

 0.54

 0.72

 0.90

 1.08

 1.28

 1.44

 0.7

 0.21

 0.42

 0.63

 0.84

 1.05

 1.26

 1.47

 1.68

 0.8

 0.24

 0.48

 0.72

 0.96

 1.20

 1.44

 1.68

 1.92

 0.9

 0.27

 0.54

 0.81

 1.08

 1.35

 1.62

 1.89

 2.16

 1.0

 0.30

 0.60

 0.90

 0.120

 1.50

 1.80

 2.10

 2.40

 2.0

 0.60

 1.20

 1.80

 2.40

 3.00

 3.60

 4.20

 4.80

 3.0

 0.90

 1.80

 2.70

 3.60

 4.50

 5.40

 6.30

 7.20

 4.0

 1.20

 2.40

 3.60

 4.80

 6.00

 7.20

 8.40

 9.60

 5.0

 1.50

 3.00

 4.50

 6.00

 7.50

 9.00

 10.50

 12.00

 6.0

 1.80

 3.60

 5.40

 7.20

 9.00

 10.80

 12.80

 14.40

 7.0

 2.10

 4.20

 6.30

 8.40

 10.50

 12.60

 14.70

 16.80

 8.0

 2.40

 4.80

 7.20

 9.60

 12.00

 14.40

 16.80

 19.20

 9.0

 2.70

 5.40

 8.10

 10.80

 13.50

 16.20

 18.90

 21.60

 10.0

3.00 

 6.00

9.00 

 12.00

15.00 

 18.00

21.00 

 24.00