BS ISO 4065:2018 pdf download

BS ISO 4065:2018 pdf download

BS ISO 4065:2018 pdf download.Thermoplastics pipes — Universal wall thickness table
1 Scope
This document specifies the relationship between the nominal wall thickness e n and the nominal outside diameter d n of thermoplastics pipes.
It is applicable to solid-wall thermoplastics pipes of constant circular cross-section along the whole length of the pipe, whatever their method of manufacture, their composition or their intended application.
NOTE Pipes with constant circular cross-section along the whole length of the pipe are commonly known as pipes with smooth external and internal surfaces.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 3, Preferred numbers — Series of preferred numbers
ISO 497:1973, Guide to the choice of series of preferred numbers and of series containing more rounded values of preferred numbers
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at
— ISO Online browsing platform: available at
3.1 nominal outside diameter
d n
specified outside diameter, assigned to a nominal size DN
Note 1 to entry: Nominal outside diameter is expressed in millimetres.
Note 2 to entry: For metric pipes conforming to this document, the nominal outside diameter, expressed in millimetres, is the minimum mean outside diameter dem.min specified in the applicable pipe standard.
3.2 mean outside diameter
d em
value of the measurement of the outer circumference of the pipe in any cross-section divided by π,rounded up to the nearest 0,1 mm
Note 1 to entry: The value of π is taken to be 3,142.
3.3 wall thickness at any point
measured wall thickness at any point around the circumference of the pipe, rounded to the next higher 0,1 mm
3.4 nominal wall thickness
wall thickness tabulated in this document, and identical to the minimum permissible wall thickness at any point, e min
3.5 standard dimension ratio
numerical designation of a pipe series, which is a convenient round number, approximately equal to the ratio of the nominal outside diameter d n of а pipe to its nominal wall thickness e n
Note 1 to entry: This value may also be derived from the formula given in 3.6.