ISO 10803:2024
(Main)Design method for ductile iron pipes
Design method for ductile iron pipes
This document specifies the design of ductile iron pipes used for conveying water, sewerage and other fluids — with or without internal pressure, and — with or without earth and traffic loading. The design method defined in this document is applicable to ductile iron pipes conforming to ISO 2531, ISO 7186 and ISO 16631.
Méthode de calcul des tuyaux en fonte ductile
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Standards Content (Sample)
International
Standard
ISO 10803
Third edition
Design method for ductile iron pipes
2024-11
Méthode de calcul des tuyaux en fonte ductile
Reference number
© ISO 2024
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ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Design procedure . 3
4.1 General .3
4.2 Design steps .3
5 Design for internal pressure . 3
5.1 Design formulae for wall thickness .3
5.2 Design safety factors .4
6 Design for external loads . 4
6.1 Spangler formula .4
6.2 Pipe embedment .7
6.2.1 Types of embedment .7
6.2.2 Types of trenches .8
6.2.3 Embedment properties .8
6.2.4 Spangler modulus of native soils .9
7 Safety check against internal pressure and external loads . 9
7.1 Principle .9
7.1.1 General .9
7.1.2 Method 1: calculate maximum allowable depth of cover from maximum
allowable pipe deflection .10
7.1.3 Method 2: calculate the actual pipe deflection from the actual depth of cover .10
7.2 Total vertical pressure on the pipe.10
7.3 Pressure from earth loads .11
7.4 Pressure from traffic loads .11
7.5 Allowable pipe diametral deflection . 12
Annex A (informative) Dimensions of preferred and other class pipes . 14
Annex B (informative) Examples of calculations for safety check with methods 1 and 2. 17
Annex C (informative) Examples of traffic loads systems .34
Annex D (informative) Soil classification .40
Bibliography . 41
iii
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee
has been established has the right to be represented on that committee. International organizations,
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with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO document should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
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This document was prepared by Technical Committee ISO/TC 5, Ferrous metal pipes and metallic fittings,
Subcommittee SC 2, Cast iron pipes, fittings and their joints.
This third edition cancels and replaces the second edition (ISO 10803:2011), which has been technically
revised.
The main changes are as follows:
— considering various applicable standards in different countries for the traffic loading, common new
formulae have been developed to enable the calculation of the pressure on pipe due to traffic loads for
any country;
— the previous formula to calculate the pressure on pipe due to traffic loads and the earth loads has no
provision to consider the effect of the settlement of side fill and the effect of native soil; the modified
formula now takes into account the effect of settlement of soil in terms of deflection lag factor and the
effect of native soil by considering the soil modulus of native soil;
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
International Standard ISO 10803:2024(en)
Design method for ductile iron pipes
1 Scope
This document specifies the design of ductile iron pipes used for conveying water, sewerage and other fluids
— with or without internal pressure, and
— with or without earth and traffic loading.
The design method defined in this document is applicable to ductile iron pipes conforming to ISO 2531,
ISO 7186 and ISO 16631.
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 2531, Ductile iron pipes, fittings, accessories and their joints for water applications
ISO 7186, Ductile iron products for sewerage applications
ISO 7268, Pipe components — Definition of nominal pressure
ISO 10802, Ductile iron pipelines — Hydrostatic testing after installation
ISO 16631, Ductile iron pipes, fittings, accessories and their joints compatible with plastic (PVC or PE) piping
systems, for water applications and for plastic pipeline connections, repair and replacement
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 7268 and the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
3.1
allowable operating pressure
PFA
P
FA
maximum internal pressure, excluding surge, that a component can safely withstand in permanent service
[SOURCE: ISO 2531:2009, 3.2, modified — The symbol P has been added.]
FA
3.2
maximum allowable operating pressure
PMA
P
MA
maximum internal pressure, including surge, that a component can safely withstand in service
[SOURCE: ISO 2531:2009, 3.17, modified — The symbol P has been added.]
MA
3.3
allowable site test pressure
PEA
P
EA
maximum hydrostatic pressure that a newly installed component can withstand for a relatively short
duration, when either fixed above ground level or laid and backfilled underground, in order to ensure the
integrity and leak tightness of the pipeline
Note 1 to entry: This test pressure is different from the system test pressure, which is related to the design pressure
(3.11) of the pipeline.
[SOURCE: ISO 2531:2009, 3.3, modified — The symbol P has been added.]
EA
3.4
embedment
arrangement and type(s) of material around a buried pipeline, which contribute to its structural performance
Note 1 to entry: See Figure 2.
3.5
bedding
lower part of the embedment (3.4), composed of the lower bedding (if necessary) and the upper bedding
Note 1 to entry: See Figure 2.
3.6
bedding reaction angle
conventional angle used in the calculation model to account for the actual soil pressure distribution at pipe invert
3.7
compaction
deliberate densification of soil during the installation process
3.8
standard proctor density
degree of soil compaction (3.7) using a 2,5 kg rammer and a 305 mm drop
Note 1 to entry: The degree of soil compaction is defined in AASHTO T99.
3.9
deflection lag factor
factor that takes account of the settlement of the sidefill over time resulting in further deflection of the pipe,
till the final equilibrium is reached after pipe installation
3.10
operating pressure
OP
P
O
highest pressure that occurs at a time and at a point in the pipeline when operating continuously under
stable conditions, without surge
3.11
design pressure
maximum operating pressure (3.10) of the pipeline system or of the pressure zone fixed by the designer,
considering future developments but excluding surge
4 Design procedure
4.1 General
The pipe wall thickness shall provide adequate strength against the internal pressure of the fluid and
against the effects of external loads due to backfill and surcharge, i.e. traffic loadings.
Ductile iron pipes in confo
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