ISO 11922 Thermoplastic Pipes Dimensions

Reference data and engineering information about iso 11922 thermoplastic pipes dimensions for piping systems applications.

iso11922thermoplasticpipes

Overview

Engineering reference data for ISO 11922 Thermoplastic Pipes Dimensions in piping systems.

$A_1 v_1 = A_2 v_2$

Mass conservation in pipe flow.

$\Delta P = f \frac{L}{D} \frac{\rho v^2}{2}$

Darcy-Weisbach equation.

$A = \frac{\pi D^2}{4}$

Cross-sectional area of a pipe.

The standard defines five tolerance grades for the outside diameter. Grades A, B, and C are calculated from the nominal diameter (dn).

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ISO 11922 Outside Diameter Tolerance Grades (Metric Series)
Grade	Formula	Min Tolerance (mm)	Max Tolerance (mm)	DN Range (mm)	Notes
A	T = 0.009d_n	0.3	10	All	Rounded up to 0.1 mm.
B	T = 0.006d_n	0.3	4	All	Rounded up to 0.1 mm.
C	T = 0.003d_n	0.3	2	All	Rounded up to 0.1 mm.
D	N/A	-	-	10 – 1000	Based on practical experience; tighter than Grade C.
E	Specific values	-	-	110, 125, 140	For applications like socket fusion in PE systems where Grade B may be too loose.

Source: iso.org/standard/73918.html

The standard specifies the following nominal outside diameters (d_n) for thermoplastic pipes in the metric series.

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Source: iso.org/standard/73918.html

For the inch-based series, the standard provides the mean external diameter corresponding to the nominal pipe size.

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Source: iso.org/standard/73918.html