ISO 18672-1:2009

INTERNATIONAL ISO
STANDARD 18672-1
First edition
2009-06-15
Plastics piping systems for non-pressure
drainage and sewerage — Polyester resin
concrete (PRC) —
Part 1:
Pipes and fittings with flexible joints
Systèmes de canalisations en plastique pour les branchements et les
collecteurs d'assainissement sans pression — Béton résines polyester
(BRP) —
Partie 1: Tubes et raccords avec assemblages flexibles

Reference number
©
ISO 2009
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©  ISO 2009
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ii © ISO 2009 – All rights reserved

Contents Page
Foreword. iv
1 Scope . 1
2 Normative references . 1
3 Terms, definitions, symbols and abbreviations . 2
3.1 Terms and definitions. 2
3.2 Symbols and abbreviations . 6
4 General requirements. 9
4.1 Materials . 9
4.2 Appearance . 10
4.3 Reference conditions for testing. 10
4.4 Joints. 10
5 Pipes. 11
5.1 Classification. 11
5.2 Designation . 12
5.3 Geometrical characteristics. 12
5.4 Mechanical characteristics . 20
5.5 Marking of pipes . 24
6 Fittings . 24
6.1 General. 24
6.2 Bends . 25
6.3 Branches. 28
6.4 Marking of fittings. 30
7 Joint performance. 30
7.1 General. 30
7.2 Requirements . 30
Annex A (normative) Test method for the determination of a pipe’s crushing strength and ring
bending tensile strength using a pipe test piece . 34
Annex B (normative) Test method for the determination of a pipe’s crushing strength or ring
bending tensile strength using test pieces sawn from a pipe . 42
Annex C (normative) Test methods for the assessment of longitudinal bending moment
resistance . 48
Annex D (normative) Test method for the determination of the compressive strength of polyester
resin concrete (PRC) using test pieces cut from a pipe. 54
Annex E (normative) Test method for the determination of the fatigue strength of a pipe under
cyclic loading . 58
Annex F (normative) Method for the assessment of the leaktightness of a pipe and its joints
under short-term exposure to internal water pressure. 63
Annex G (normative) Test method for the determination of the long-term (50 years) crushing
strength of a pipe, including the effects of media attack . 65

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, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 18672-1 was prepared by Technical Committee ISO/TC 138, Plastics pipes, fittings and valves for the
transport of fluids, Subcommittee SC 6, Reinforced plastics pipes and fittings for all applications.
ISO 18672 consists of the following parts, under the general title Plastics piping systems for non-pressure
drainage and sewerage — Polyester resin concrete (PRC):
⎯ Part 1: Pipes and fittings with flexible joints

iv © ISO 2009 – All rights reserved

INTERNATIONAL STANDARD ISO 18672-1:2009(E)

Plastics piping systems for non-pressure drainage and
sewerage — Polyester resin concrete (PRC) —
Part 1:
Pipes and fittings with flexible joints
1 Scope
This part of ISO 18672 specifies definitions, requirements and characteristics of pipes, fittings, joints, materials,
test methods and marking for pipes and fittings made from polyester resin concrete (PRC), intended to be
used within a drain or sewer system operating without pressure. It applies to products for use in buried
installations to be installed by open-trench techniques or pipe jacking.
It applies to pipes, fittings and their joints of nominal sizes from DN 150 to DN 3000 for circular cross-sections,
from WN/HN 300/450 to WN/HN 1400/2100 for egg-shaped cross-sections and from DN 800 to DN 1800 for
kite-shaped cross-sections.
The intended use of these products is for the conveyance of sewage, rainwater and surface water at
1)
temperatures up to 50 °C, without pressure or occasionally at a head of pressure up to 0,5 bar , and installed
in areas subjected to vehicle and/or pedestrian traffic.
The pipes are classified on the basis of the intended method of installation and cross-sectional shape.
NOTE It is the responsibility of the purchaser or specifier to make the appropriate selections, taking into account the
particular requirements and any relevant national regulations and installation practices or codes.
2 Normative references
The following referenced documents are indispensable for the application 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 75-2, Plastics — Determination of temperature of deflection under load — Part 2: Plastics and ebonite
ISO 3126, Plastics piping systems — Plastics components — Determination of dimensions
ISO 7510, Plastics piping systems — Glass-reinforced plastics (GRP) components — Determination of the
amounts of constituents using the gravimetric method
ISO 8639, Glass-reinforced thermosetting plastics (GRP) pipes and fittings — Test methods for leaktightness
of flexible joints
ISO 10928, Plastics piping systems — Glass-reinforced thermosetting plastics (GRP) pipes and fittings —
Methods for regression analysis and their use
EN 681-1, Elastomeric seals — Material requirements for pipe joint seals used in water and drainage
applications — Part 1: Vulcanized rubber

2 5 2
1) 1 bar = 0,1 MPa = 0,1 N/mm = 10 N/m
EN 13121-1, GRP tanks and vessels for use above ground — Part 1: Raw materials — Specification
conditions and acceptance conditions
3 Terms, definitions, symbols and abbreviations
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1.1
adaptor
fitting that provides for connections to structures, pipes of other materials, or valves
3.1.2
angular deflection
δ
angle between the axes of two adjacent pipes
See Figures 1b) and 1c).
NOTE Angular deflection is expressed in degrees (°).
3.1.3
bend
fitting that provides for a change of alignment within a pipeline
3.1.4
branch
fitting comprising a pipe with one additional connecting pipe of equal or smaller nominal size, DN or WN/HN,
to connect two pipelines
NOTE See 3.1.13 and 3.1.14 for DN and WN/HN.
3.1.5
design service temperature
maximum sustained temperature at which the system is expected to operate
NOTE It is expressed in degrees Celsius (°C).
3.1.6
draw
D
longitudinal movement of a joint
See Figure 1a).
NOTE Draw is expressed in millimetres (mm).
3.1.7
laying length of a bend
L
distance from one end of the bend, excluding the spigot insertion depth, L , of a socket end, where applicable,
i
projected along the axis of that end of the bend to the point of intersection with the axis of the other end of the
bend
See Figure 8.
NOTE Laying length of a bend is expressed in metres (m).
2 © ISO 2009 – All rights reserved

3.1.8
laying length of a pipe
internal barrel length
L
total length of a pipe, L , minus, where applicable, the manufacturer’s recommended spigot insertion depth,
tot
L , in the socket
i
NOTE 1 The laying length of a pipe is expressed in metres (m).
NOTE 2 See 3.1.20 for total pipe length, L .
tot
3.1.9
fitting
component comprising an adaptor, bend or branch
3.1.10
flexible joint
joint that allows relative movement between the components being joined
3.1.11
minimum crushing load
q
cr,min
short-term load that a component is required to withstand during a crushing strength test, without failure,
corresponding to its nominal size, classification and strength class
NOTE 1 The minimum crushing load is determined using Equation (1) or Equation (2), as applicable (see 5.4.1.1).
NOTE 2 For the purposes of this part of ISO 18672, it is expressed in newtons per millimetre length (N/mm).
3.1.12
misalignment
M
amount by which the centre lines of adjacent pipes fail to coincide
See Figure 1d).
3.1.13
nominal size
DN
alphanumerical designation of size, for a component with a circular or kite-shaped bore
NOTE 1 It is a convenient round number for reference purposes and is r
...