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Polyethylene Pipe Systems

The Polyethylene Difference

Crown Plastics PE pipes are made from 100% virgin polyethylene and only contain UV stabilizers and pigments necessary for the pipes to conform to the specifications. Pipes contain minimum of 2.5% carbon black. All pipes are black in color for maximum UV resistance and suitable for drinking water and potable water supplies.


Table 1: Designation of Material

Designation of material MRS at 50 years and 20 oC MPa Maximum allowable hydrostatic
design stress, σs
MPa
PE 100 10 8
PE 80 8 6.3
PE 63 6.3 5
PE 40 4 3.2
PE 32 3.2 2.5

The relationship between MRS and σs for various design coefficients is given in Table 2



Table 2: Relationship between MRS, σs and design coefficient C at 20oC
Hydrostatic
design σs
stress of pipe, MPa
Minimum required strength of material
10 8 6.3 4 3.2
Design coefficient, C
8 1.25 - - - -
6.3 1.6 1.25 - - -
5 2 1.6 1.25 - -
4 2.5 2 1.6 - -
3.2 3.2 2.5 2 1.25 -
2.5 - 3.2 2.5 1.6 1.25


ISO 4427: 1996 DIN 8074
Pipes of High Density Polyethylene (HDPE)
Polyethylene pipes with a design stress σ of 5 MPa

Nominal
Outside
Diameter
Pipe Series 1)
S 16 S 12.5 S 8.3 S 8 S 6.3 S 5 S 4 S 3.2
Standard Dimension Ratio
SDR 33 SDR 26 SDR 17.6 SDR 17 SDR 13.6 SDR 11 SDR 9 SDR 7.4
Nominal pressure PN 2) for σ=5 MPa
PN 3.2 PN 4 PN 6 PN 6.3 PN 8 PN 10 PN 12.5 PN 16
Nominal wall thickness, en
mm
16 - - - - - 2.3 2.3 2.3
20 - - - - 2.3 2.3 2.3 2.8
25 - - 2.3 2.3 2.3 2.3 2.8 3.5
32 - - 2.3 2.3 2.4 2.9 36 4.4
40 - 2.3 2.3 2.4 3.0 3.7 4.5 5.5
50 - 2.3 2.9 3.0 3.7 4.6 5.6 6.9
63 2.3 2.5 3.6 3.8 4.7 5.8 7.1 8.6
75 2.3 2.9 4.3 4.5 5.6 6.8 8.4 10.3
90 2.8 3.5 5.1 5.4 6.7 8.2 10.1 12.3
110 3.4 4.2 6.3 6.6 8.1 10.0 12.3 15.1

DIN 8072

Pipes of Linear Low Density Polyethylene (LLDPE)

Outside
Diameter
Wall Thickness
2.5 Bar
Rating
6 Bar
Rating (mm)
10 Bar
Rating (mm)
10 - - 2.0
12 - - 2.0
16 - 2.0 2.7
20 - 2.2 3.4
25 2.0 2.7 4.2
32 2.0 3.5 5.4
40 2.0 4.3 6.7
50 2.4 5.4 8.4
60 3.0 6.8 10.5
75 3.6 8.1 12.5
90 4.3 9.7 15.0
110 5.3 11.8 18.4

Drip Tubing

ASAE S435

ASTM Standard Linear Low Density Drip Tubing (LLDPE)

Ordering
Code
Nominal
Inside
Diameter
Average
Outside
Diameter
Minimum
Wall
Thickness
Nominal
Working
Pressure
in mm in mm in mm Bar Psi
DP 15670 D (112) 1/ 2 13 .617 15.67 .044 1.12 69 4.8
DP 17960 D (124) 1/ 2 15 .707 17.96 .049 1.24 67 4.6
DP 18110 D (107) 1/ 2 16 .713 18.11 .042 1.07 57 3.9
DP 20900 D (119) 3/ 4 18 .823 20.90 .047 1.19 55 3.8
DP 23440 D (132) 3/ 4 21 .923 23.44 .052 1.32 54 3.7
DP 30020 D (157) 1 27 1.180 30.02 .062 1.57 50 3.4

AUST STD 2698-1 : 1984

Australian Standard Linear Low Density Drip Irrigation Tubing (LLDPE)

Ordering Code Nominal Inside Diameter Minimum Inside Diameter Minimal Wall Thickness Nominal Working Pressure Coil
Size
in mm in mm in mm Bar Psi M
DP 13 (12) 1/2 13 .50 12.70 .047 1.2 3 45 250 m
DP 13 (15) 1/2 13 .50 12.70 .059 1.5 4 60 250 m
DP 16 (12) 1/2 16 .62 15.80 .047 1.2 3 45 250 m
DP 19 (13) 3/4 19 .74 18.90 .051 1.3 3 45 250 m
DP 25 (15) 1 25 1.00 25.20 .059 1.5 3 45 250 m
DP 32 (20) 1 ¼ 32 1.24 31.50 .078 2.0 3 45 250 m

BS 1972 / 67

British Standard Low Density Polyethylene (LDPE)

Nominal Size Outside Diameter Wall Thickness
Class B
6.1 kgf/cm2 (Bar Aprox)
Class C
9.1 kgf/cm2 (Bar Aprox)
Class D
12.2 kgf/cm2 (Bar Aprox)
  Min Max Min Max Min Max Min Max
  in mm in mm in mm in mm in mm in mm in mm in mm
3/8 17.0 (0.669) 17.3 (0.681) - - - - 2.2 (0.087) 2.5 (0.098) 2.8 (0.110) 3.1 (0.122)
1/2 21.2 (0.835) 21.5 (0.847) - - - - 2.7 (0.106) 3.0 (0.118) 3.4 (0.134) 3.7 (0.146)
3/4 26.6 (1.047) 26.9 (1.059) 2.3 (0.091) 2.6 (0.102) 3.4 (0.134) 3.7 (0.146) 4.3 (0.169) 4.7 (0.185)
1 33.4 (1.315) 33.7 (1.327) 3.0 (0.118) 3.3 (0.130) 4.2 (0.165) 4.6 (0.181) 5.4 (0.213) 5.9 (0.232)
1 1/4 42.1 (1.657) 42.5 (1.673) 3.7 (0.146) 4.1 (0.161) 5.3 (0.209) 5.8 (0.228) 6.8 (0.268) 7.5 (0.295)
1 1/2 48.1 (1.894) 48.5 (1.910) 4.3 (0.169) 4.7 (0.185) 6.1 (0.240) 6.7 (0.264) 7.8 (0.307) 8.6 (0.338)
2 60.1 (2.366) 60.6 (2.386) 5.3 (0.209) 5.8 (0.228) 7.6 (0.299) 8.4 (0.331) - - - -
3 88.6 (3.488) 89.3 (3.516) 7.8 (0.307) 8.6 (0.339) 11.2 (0.441) 12.3 (0.484) - - - -
4 113.9 (4.484) 114.7 (4.516) 10.0 (0.394) 11.0 (0.433) - - - - - - -

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