ISO 161-1:2018 PDF

Thermoplastics pipes for the conveyance of fluids — Nominal outside diameters and nominal pressures — Part 1: Metric series

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Title (English):

ISO 161-1:2018

Thermoplastics pipes for the conveyance of fluids — Nominal outside diameters and nominal pressures — Part 1: Metric series

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 5
Publication date:: January 8, 2018
Edition:: ISO IS 161 edition 4 version 1
ICS:: 23.040.20

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Description (English):

ISO 161-1:2018 specifies the nominal outside diameters for metric thermoplastics pipes for the conveyance of fluids in pressure and non-pressure applications. It also specifies nominal pressure ratings and minimum required strengths for pressure applications. ISO 161-1:2018 is applicable to smooth thermoplastics pipes of constant circular cross-section along the whole length of the pipe, whatever their method of manufacture or material of construction. ISO 161-1:2018 is not applicable to pipes designated according to the nominal inside diameter DN/ID. ISO 161-1:2018 is a basis for standards writers for the selection of nominal diameters and nominal pressures in the drafting of product standards.

Technical details

Technical committee: ISO/TC 138 - Plastics pipes, fittings and valves for the transport of fluids
SKU: ISO 161-1:2018

Abstract

Overview

ISO 161-1:2018 - Thermoplastics pipes for the conveyance of fluids - Part 1: Metric series - defines the nominal outside diameters (dn), nominal pressure ratings (PN) and minimum required strengths (MRS) for metric thermoplastics pipes used to convey fluids. The standard applies to smooth thermoplastics pipes with a constant circular cross-section (regardless of material or manufacturing method) and serves as a reference basis for product standard writers. It does not apply to pipes designated by nominal inside diameter (DN/ID).

Key topics and requirements

Nominal outside diameter (dn): Values are specified in a metric table covering nominal sizes up to 3 000 mm (DN 3000 uses the R 40 series in ISO 3). For metric pipes conforming to ISO 161-1, dn equals the minimum mean outside diameter dem.min specified in the applicable pipe standard.
Nominal pressure rating (PN): PN values are selected from the R 10 preferred-number series (ISO 3). ISO 161-1:2018 extends PN choices (including PN 25) and clarifies that PN 6 must be designed using 6.3 bar from the R 10 series.
Minimum required strength (MRS): MRS is defined as the lower confidence limit (LPL) of long-term hydrostatic strength at 20 °C for 50 years, rounded to preferred-number series values. MRS steps from 1 to 20 MPa use R 10 increments; MRS values above 20 MPa use R 20 increments.
Design stress and hydrostatic stress: Design stress σS = MRS / C, where C is the design coefficient (see ISO 12162). Hydrostatic stress for internal pressure p is given by σ = p·d / (2·e) (with d = outside diameter, e = wall thickness).
Terminology and measurement rules: Definitions for outside diameter at any point, mean outside diameter, minimum mean outside diameter and other terms are provided to ensure consistency in product standards.

Applications and who uses it

ISO 161-1:2018 is essential for:

Standards writers drafting thermoplastics pipe product standards and specifications
Pipe manufacturers and material suppliers specifying nominal sizes and pressure ratings
Pipeline designers, civil and mechanical engineers selecting pipe systems for pressure and non-pressure fluid conveyance
Test laboratories and certification bodies assessing long-term pressure performance
Procurement and regulatory authorities harmonizing technical requirements across projects

Related standards

ISO 3 - Preferred numbers (R series used for dn, PN, MRS rounding)
ISO 12162 - Thermoplastics materials for pipes and fittings for pressure applications (classification and design coefficient)
ISO 497 - Guide to choice of preferred-number series

Keywords: ISO 161-1:2018, thermoplastics pipes, nominal outside diameter, nominal pressure, MRS, metric series, pipe standards, conveyance of fluids.

Related standards

Standards mentioned in the description

Abstract

Overview

Key topics and requirements

Nominal outside diameter (dn): Values are specified in a metric table covering nominal sizes up to 3 000 mm (DN 3000 uses the R 40 series in ISO 3). For metric pipes conforming to ISO 161-1, dn equals the minimum mean outside diameter dem.min specified in the applicable pipe standard.
Nominal pressure rating (PN): PN values are selected from the R 10 preferred-number series (ISO 3). ISO 161-1:2018 extends PN choices (including PN 25) and clarifies that PN 6 must be designed using 6.3 bar from the R 10 series.
Minimum required strength (MRS): MRS is defined as the lower confidence limit (LPL) of long-term hydrostatic strength at 20 °C for 50 years, rounded to preferred-number series values. MRS steps from 1 to 20 MPa use R 10 increments; MRS values above 20 MPa use R 20 increments.
Design stress and hydrostatic stress: Design stress σS = MRS / C, where C is the design coefficient (see ISO 12162). Hydrostatic stress for internal pressure p is given by σ = p·d / (2·e) (with d = outside diameter, e = wall thickness).
Terminology and measurement rules: Definitions for outside diameter at any point, mean outside diameter, minimum mean outside diameter and other terms are provided to ensure consistency in product standards.

Applications and who uses it

ISO 161-1:2018 is essential for:

Standards writers drafting thermoplastics pipe product standards and specifications
Pipe manufacturers and material suppliers specifying nominal sizes and pressure ratings
Pipeline designers, civil and mechanical engineers selecting pipe systems for pressure and non-pressure fluid conveyance
Test laboratories and certification bodies assessing long-term pressure performance
Procurement and regulatory authorities harmonizing technical requirements across projects

Related standards

ISO 3 - Preferred numbers (R series used for dn, PN, MRS rounding)
ISO 12162 - Thermoplastics materials for pipes and fittings for pressure applications (classification and design coefficient)
ISO 497 - Guide to choice of preferred-number series

Keywords: ISO 161-1:2018, thermoplastics pipes, nominal outside diameter, nominal pressure, MRS, metric series, pipe standards, conveyance of fluids.

ISO 161-1:2018 PDF

Technical details

Abstract

Overview

Key topics and requirements

Applications and who uses it

Related standards

Related standards

Abstract

Overview

Key topics and requirements

Applications and who uses it

Related standards

Related standards

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