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ISO 11922 - Thermoplastics pipes for the conveyance of fluids - Dimensions

Dimensions of plastic pipes according ISO 11922 - metric and imperial units

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ISO 11922 specifies tolerance grades for the outside diameter, out-of-roundness and wall thickness of thermoplastics pipes for the conveyance of fluids.

Outside Diameters Metric Series

Nominal Outside Diameter (mm)
10 125 500
12 140 560
16 160 630
20 180 710
25 200 800
32 225 900
40 250 1000
50 280 1200
63 315 1400
75 355 1600
90 400 1800
110 450 2000

Outside Diameter Tolerances

  • Grade A: For all nominal outside diameters, the tolerance equals O,009dn, rounded up to the nearest 0.1 mm with a minimum value of 0,3 mm and a maximum value of 10.0 mm.
  • Grade B: For all nominal outside diameters, the tolerance equals O,006dn, rounded up to the nearest 0.1 mm with a minimum value of 0.3 mm and a maximum value of 4,0 mm.
  • Grade C: For all nominal outside diameters, the tolerance equals O,003dn, rounded up to the nearest 0.1 mm, with a minimum value of 0.3 mm and a maximum value of 20 mm.
  • Grade D: For nominal outside diameters from 10 to 1000 mm, the tolerances have been based on practical experience where tighter tolerances than those specified for grade C are required.
  • Grade E: Practical experience and test data have demonstrated that, for certain types of joint for which grade B tolerances may generally be applicable, e.g. socket fusion joints in PE pipe systems, the calculated tolerances for nominal outside diameters of 110, 125 and 140 are too great and may lead to premature joint failure. Therefore, for such applications, grade E tolerances have been established.

Outside Diameters Inch-based Series

Mean External Diameter
(mm)
Nominal Size
(inches)
10.2 1/8
13.5 1/4
17.2 3/8
21.3 1/2
26.9 3/4
33.7 1
42.4 1 1/4
48.3 1 1/2
60.3 2
75.3 2 1/2
88.9 3
114.3 4
168.3 6
193.7 7
219.1 8
244.5 9
273.0 10
323.9 12
355.6 14
406.4 16
457.2 18
508.0 20
558.8 22
609.6 24
660.4 26
711.2 28

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