ISO 18672-1:2009

Plastics piping systems for non-pressure drainage and sewerage - Polyester resin concrete (PRC) - Part 1: Pipes and fittings with flexible joints

ISO 18672-1:2009 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.

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

General Information

• Status: Published
• Publication Date: 01-Jun-2009
• ICS: 23.040.20 - Plastics pipes
• ICS: 23.040.45 - Plastics fittings
• ICS: 91.140.80 - Drainage systems
• ICS: 93.030 - External sewage systems
• Technical Committee: ISO/TC 138/SC 6 - Reinforced plastics pipes and fittings for all applications
• Drafting Committee: ISO/TC 138/SC 6 - Reinforced plastics pipes and fittings for all applications
• Current Stage: 9093 - International Standard confirmed
• Start Date: 13-Sep-2024
• Completion Date: 13-Dec-2025

Overview

ISO 18672-1:2009 - "Plastics piping systems for non-pressure drainage and sewerage - Polyester resin concrete (PRC) - Part 1: Pipes and fittings with flexible joints" specifies definitions, requirements and characteristics for PRC pipes, fittings and flexible joints intended for non‑pressure drainage and sewer systems. It covers materials, dimensional and mechanical requirements, test methods, joint performance and marking for buried installations installed by open-trench techniques or pipe jacking. The standard applies to circular (DN 150–DN 3000), egg‑shaped (WN/HN 300/450 to WN/HN 1400/2100) and kite‑shaped (DN 800–DN 1800) cross‑sections, for service temperatures up to 50 °C and occasional heads up to 0.5 bar.

Key Topics and Requirements

• Scope and sizing: Nominal sizes and cross‑section forms (circular, egg, kite) and classifications based on installation method and shape.
• Materials and composition: Requirements for polyester resin concrete (PRC) components, including aggregate and binder considerations.
• Geometrical & mechanical characteristics: Dimensions, wall thicknesses and mechanical strength criteria for crushing, ring bending and longitudinal bending resistance.
• Joint design and performance: Specifications for flexible joints, allowable draw, angular deflection, misalignment and leaktightness under short‑term exposure.
• Test methods: Normative annexes (A–G) that include methods for:
  • Crushing strength and ring bending tensile strength
  • Longitudinal bending moment resistance
  • Compressive strength of PRC
  • Fatigue strength under cyclic loading
  • Joint leaktightness and long‑term (50‑year) crushing strength including media attack
• Marking and documentation: Manufacturer marking, designation and information required for traceability and specification compliance.
• Reference conditions: Normal service defined as conveyance of sewage, rainwater or surface water between 2 °C and 50 °C for 50 years.

Applications

ISO 18672-1 is used for the specification, testing and acceptance of PRC pipes and fittings in:

• Urban and municipal sewer systems (gravity drains, combined sewers)
• Stormwater and surface‑water drainage
• Buried infrastructure installed by open trench or pipe jacking
• Areas subjected to vehicle and pedestrian traffic where durable, non‑pressure sewer conveyance is required

Who uses this standard

• Civil and municipal engineers specifying sewer infrastructure
• Pipe and fitting manufacturers (product design, quality control)
• Construction contractors and installers (compliance with joint movement and installation practice)
• Testing laboratories performing type and routine tests
• Asset owners and utilities for procurement and conformity assessment
• Regulators and standards bodies referencing performance requirements

Related Standards

Normative references include ISO 75‑2, ISO 3126, ISO 7510, ISO 8639, ISO 10928 and relevant EN standards for elastomer seals and GRP materials (e.g., EN 681‑1, EN 13121‑1). These support material testing, dimensional verification and joint sealing performance.

Standards Content (Sample)

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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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 related to the internal diameter when expressed
in millimetres.
NOTE 2 The designation for reference or marking purposes consists of the letters DN plus a number, e.g. DN 600.
3.1.14
nominal size
WN/HN
alphanumerical designation of size for a component with an egg-shaped bore
NOTE 1 It is a convenient round number for reference purposes and is related to the internal width and height (w and
i
h , see Figures 3 and 6), expressed in millimetres.
i
NOTE 2 The designation, for reference or marking purposes, consists of the letters WN/HN plus two numbers, e.g.
WN/HN 300/450.
3.1.15
non-pressure pipe or fitting
pipe or fitting not subject to an internal pressure greater than 0,5 bar
3.1.16
normal service conditions
conveyance of surface water, rainwater or sewage, in the temperature range from 2 °C to 50 °C, without
pressure, for 50 years
3.1.17
rerating factor
multiplication factor that quantifies the relation between a mechanical, physical or chemical property at the
service condition and the respective value at 23 °C and 50 % relative humidity
3.1.18
strength class
S
c
constant equal to the minimum short-term crushing load of a component, q , divided by one thousandth of
cr,min
either its nominal size (DN) or nominal width (WN)
NOTE It is expressed in newtons per millimetre length (N/mm).
3.1.19
total draw
D
tot
sum of the draw, D, plus the additional longitudinal movement of joint components, J, due to angular deflection, δ
See Figure 1c).
NOTE It is expressed in millimetres (mm).
3.1.20
total pipe length
L
tot
distance between two planes normal to the pipe axis and passing through the extreme end points of the pipe
See Figures 2 to 7.
NOTE It is expressed in millimetres (mm).
3.1.21
type tests
tests carried out in order to assess the fitness for purpose of a product or assembly of components to fulfil its
or their function(s) in accordance with the product specification
3.1.22
crushing load
crushing strength
q
cr
maximum short-term load that a component is able to withstand during a crushing strength test
NOTE It is expressed in newtons per millimetre length (N/mm).
3.1.23
polyester resin concrete
PRC
material formed from mineral aggregates and fillers which are bound together using a polyester resin
4 © ISO 2009 – All rights reserved

a)
b)
c)
Figure 1 (continued)
d)
Key
δ angular deflection
D draw
D total draw
tot
J longitudinal movement of the joint due to angular deflection
M misalignment
Figure 1 — Joint movements
3.2 Symbols and abbreviations
For the purposes of this part of ISO 18672, the symbols given in Table 1 and abbreviations given in Table 2
apply.
Table 1 — Symbols
Symbol Description Unit Where used
a width of a bearing strip mm Annexes A and B
b
B laying length of a branch pipe mm 6.3, Figure 9
B nominal offset (body) length of a branch pipe mm 6.3, Figure 9
B
B spigot insertion depth of a branch pipe mm 6.3, Figure 9
i
b width of a sawn test piece mm 5.4.1.2, Annexes B and E
D draw mm 3.1.6, 3.1.19, Figure 1, 7.2.2
D maximum draw mm 4.4.2.2, 7.2.2, 7.2.4
max
D total draw mm 3.1.19, Figure 1, 7.2.4
tot
d external diameter of a pipe mm 5.3.1, Figure 2, 5.3.3 to 5.3.6, Figures 4
a
to 7, 6.2.1.1, 6.3.1.1
d external diameter of a spigot mm 5.3.4 to 5.3.6, Figures 5 to 7
e
d internal diameter of a pipe with a circular or mm 5.3.1, Figure 2, 5.3.3, Figure 4, 5.3.4,
i
kite-shaped cross-section Figure 5, 5.3.6, Figure 7, Annexes A, B
and E
e wall thickness of a pipe with a circular or kite- mm 4.1.3, 5.3.1, Figure 2, 5.3.3, Figure 4,
shaped cross-section or wall thickness of a 5.3.4, Figure 5, 5.3.6, Figure 7, 6.2.1.1,
test piece taken from a pipe 6.3.1.1, Annexes A, B and E
e wall thickness at the spring-line of a pipe mm 5.3.2, Figure 3, 5.3.5, Figure 6, Annex A
with egg-shaped cross-section
6 © ISO 2009 – All rights reserved

Table 1 (continued)
Symbol Description Unit Where used
e wall thickness at top of pipe of a pipe with mm 5.3.2, Figure 3, 5.3.5, Figure 6,
egg-shaped cross-section. Annexes A and B
e pedestal height of a pipe with egg-shaped mm 5.3.2, Figure 3
cross-section
f correction factor for stress distribution — Annexes B and E
corr
f factor for lower load — Annex E
low
f factor for upper load — Annex E
up
h internal height of a pipe with egg-shaped mm 3.1.14, 5.3.2, Figure 3, 5.3.5, Figure 6
i
cross-section
J longitudinal movement within a joint due to mm 3.1.19, Figure 1, 7.2.4
angular deflection, δ (see 3.1.2)
L laying length of a pipe or a bend or laying mm 3.1.7, 3.1.8, 4.4.2.2, 5.3.1 to 5.3.6,
length of the main pipe of a branch fitting Figures 2 to 7, 5.3.7.1, 5.4.2.2, 5.5,
Figure 8, 6.2.1.5, Figure 9, 6.3.1.4
L nominal body length of the main pipe of a mm 6.2, Figure 8, 6.3, Figure 9
B
fitting
L insertion depth of the spigot of a pipe or mm 3.1.7, 3.1.8, 5.3.1 to 5.3.6, Figures 2 to 7,
i
main pipe of a fitting 6.2, Figure 8, 6.3, Figure 9
L total length of a pipe mm 3.1.8, 3.1.20, Figures 2 to 7, 5.3.1 to
tot
5.3.6
l lever arm length m Annexes C and G
a
l distance between the centres of the bearers mm Annexes B, C and E
b
l distance between the centres of the fulcrums m Annex G
f
l length of a test piece mm 5.4.1.2, 7.2.4.6, Annexes A, B and E
p
l support span m Annex C
s
M misalignment mm 3.1.12, Figure 1
M minimum longitudinal bending moment kNm 5.4.2, Annex C
BMR
resistance
M calculated longitudinal bending moment kNm 5.4.2.1, Annex C
resisted by the pipe when tested using three-
point loading method
M calculated longitudinal bending moment kNm 5.4.2.1, Annex C
resisted by the pipe when tested using four-
point loading method
N specified shear load for joint misalignment N/mm of 7.2.4.2
d
test nominal size
P test load applied by loading frame N Annexes A, B and E
P total bending load applied kN Annex C
b
P calculated minimum test load N Annexes A and B
calc
P calculated lower limit of cyclic load N 5.4.4, Annex E
calc,low
P calculated upper limit of cyclic load N 5.4.4, Annex E
calc,up
Table 1 (continued)
Symbol Description Unit Where used
P load applied by loading frame at failure N Annex A
cr
P effective test load applied to a test piece with N Annex A
eff,CK
a circular or kite-shaped cross-section
P effective test load applied to a test piece with N Annex A
eff,E
an egg-shaped cross-section
P minimum load to be applied by loading frame N Annexes A and B
min
q crushing load (or crushing strength) of a pipe N/mm 3.1.22, Annexes A and B
cr
calculated from the load applied to the test
piece at the moment of failure (collapse)
q minimum crushing load N/mm 3.1.11, 3.1.18, 5.4.1, Annexes A and B
cr,min
r radius of curvature mm 6.2, Figure 8, 6.4
S strength class N/mm 3.1.11, 3.1.18, 5.2, 5.4.1.1, 5.5, 6.1.1,
c
6.1.5, 6.4, Annexes A and B
t tolerance on diametrical squareness mm/m 5.3.1 to 5.3.6, Figures 2 to 7
sq
T height, length and width of a cube sawn from mm 5.4.3, Annex D
cube
a pipe wall
W* load due to own weight of the compression N Annexes A and B
beam
W load due to own weight of a test piece N Annex A
p
W load due to own weight of a pipe N/mm of length Annex B
pipe
w internal width of a pipe with an egg-shaped mm 3.1.14, 5.3.2, Figure 3, 5.3.5, Figure 6,
i
bore Annexes A and B
w width of the pedestal of a pipe with an egg- mm 5.3.2, Figure 3
p
shaped bore
α fitting angle degrees 6.2, Figure 8, 6.3, Figure 9, 6.4
n
δ angular deflection of a joint degrees 3.1.2, Figure 1, 3.1.19, 4.4.2.1, 7.2.3
∆ deviation from straightness mm/m 5.3.1 to 5.3.6, Figures 2 to 7
str
2 a
σ calculated compressive strength N/mm 5.4.3
c
σ calculated fatigue strength N/mm Annex E
fat
σ lower limit of bending tensile stress N/mm Annex E
low
σ calculated ring bending tensile stress or N/mm Annexes A and B
rb
strength
σ minimum ring bending tensile stress N/mm Annexes B and E
rb,min
σ upper limit of bending tensile stress N/mm Annex E
up
a 2
1 N/mm = 1 MPa.
8 © ISO 2009 – All rights reserved

Table 2 — Abbreviations
Symbol Meaning Where used
BMR longitudinal bending moment resistance 5.4.2, Annex C
DN nominal size 1, 3.1.4, 3.1.11, 3.1.13, 3.1.18, 5.2 to 5.5, 6,
7.2.4, Annexes A to C,
HN nominal internal height of a pipe with egg-shaped cross- 1, 3.1.4, 3.1.14, 5.2 to 5.5, 6.1, 6.4, Annex A
section
OC classification for open-trench construction with circular 5.2 to 5.5, 6.1 and 6.4, Annexes A and B
bore
OE classification for open-trench construction with egg-shaped 5.2 to 5.5 and 6.4, Annexes A and B
bore
OK classification for open-trench construction with kite-shaped 5.2 to 5.5 and 6.4, Annexes A and B
bore
PRC polyester resin concrete 1, 3.1.23, 4.1.3, 4.1.6, 4.3.4, 5.2 to 5.5, 6.1 to
6.4, Annexes A to E
TC classification for trenchless construction with circular bore 5.2 to 5.5, Annexes A and B
TE classification for trenchless construction with egg-shaped 5.2 to 5.5, Annexes A and B
bore
TK classification for trenchless construction with kite-shaped 5.2 to 5.5, Annexes A and B
bore
WN nominal internal width of a pipe with egg-shaped cross- 1, 3.1.4, 3.1.11, 3.1.14, 3.1.18, 5.2 to 5.5, 6.1
section to 6.4, 7.2.4, Annexes A and B

4 General requirements
4.1 Materials
4.1.1 General
The pipe or fitting shall be constructed using aggregates, polyester resin (with or without fillers) and, if
applicable, additives necessary to impart specific properties to the resin.
4.1.2 Resin
The resin used in the pipe or fitting shall have a temperature of deflection of at least 70 °C, when tested in
accordance with Method A of ISO 75-2 with the test specimen in the edgewise position. It shall also conform
to the applicable requirements of EN 13121-1.
4.1.3 Aggregates and fillers
Aggregates and fillers shall not contain constituents in such quantities as may be detrimental to the curing,
strength, leaktightness or durability of the polyester resin concrete (PRC) (see 3.1.23). The size of particles in
aggregates and fillers shall not exceed one third of the smallest wall thickness, e, of the pipe or fitting.
4.1.4 Elastomers
Each elastomeric material of the sealing component shall conform to EN 681-1. The sealing component shall
be supplied by the pipe or fitting manufacturer either attached to the pipe or fitting, or separately.
4.1.5 Metals
When exposed metal components are used, there shall be no evidence of corrosion of the components after
the metallic item has been immersed for seven days at (23 ± 2) °C in an aqueous sodium chloride solution,
30 g/l, and then removed from the solution and visually examined for evidence of corrosion.
4.1.6 Minimum resin content
When tested in accordance with ISO 7510 the content of resin in the polyester resin concrete (PRC) shall be
not less than 7 % mass fraction of the sample.
4.2 Appearance
Both internal and external surfaces shall be free of irregularities which would impair the ability of the
component to conform to the requirements of this part of ISO 18672. The edges of the pipe faces shall be free
of cracks or burrs and the joint surfaces shall be free of irregularities that would preclude the formation of a
leaktight seal. The ends of a component shall be square to its longitudinal axis within the tolerances specified
in Clause 5, Tables 4 to 9, as applicable.
4.3 Reference conditions for testing
4.3.1 Temperature
The mechanical, physical and chemical properties specified in this part of ISO 18672 shall be determined at
(23 ± 5) °C. For service temperatures over 35 °C and up to and including 50 °C, type tests shall be carried out
at least at the purchaser’s declared design service temperature (see 3.1.5) to establish rerating factors (see
3.1.17) for all long-term properties to be used in design.
4.3.2 Properties of water for testing
The water used for the tests referred to in this part of ISO 18672 shall be tap water having a pH of (7 ± 2).
4.3.3 Loading conditions
The mechanical, physical and chemical properties specified in this part of ISO 18672 shall be determined
using circumferential and/or longitudinal loading conditions, as applicable.
4.3.4 Measurement of dimensions
The dimensions of the polyester resin concrete (PRC) components and the joints shall be determined at
(23 ± 5) °C. Measurements shall be made either in accordance with ISO 3126 or using any method of
sufficient accuracy to determine conformity or otherwise to the applicable limits. Routine measurements shall
be determined at the prevailing temperature or if the manufacturer prefers, at (23 ± 5) °C.
4.4 Joints
4.4.1 General
The manufacturer shall declare the length and the maximum external diameter or, for egg-shaped
components, the maximum dimensions of the assembled joint, and the materials used, in documents at the
time of the enquiry or delivery.
10 © ISO 2009 – All rights reserved

4.4.2 Flexibility of the jointing system
4.4.2.1 Maximum angular deflection
The manufacturer shall declare the maximum value of the angular deflection, δ, for which each joint is
designed, in writing at the time of enquiry or delivery.
4.4.2.2 Maximum draw
The manufacturer shall declare the maximum draw, D (see Figure 1), for which each joint is designed, in
max
writing at the time of enquiry or delivery. For flexible joints, the maximum draw, which includes temperature
effects, shall not be less than 0,2 % of the laying length, L, of the longest pipe with which it is intended to be
used.
4.4.3 Joint seals
Elastomeric joint seals shall be made from material conforming to EN 681-1. They shall be supplied by the
pipe manufacturer and shall either be integrated into the unit or supplied separately. A sealing ring shall not
have any detrimental effect on the properties of the components with which it is used and shall not cause the
test assembly to fail the functional requirements of Clause 7.
4.4.4 Adhesives
When the components of a joint are to be connected using adhesives, the adhesives to be used shall be
specified by the manufacturer of the joint in writing at the time of enquiry or delivery. The joint manufacturer
shall ensure that the adhesives do not have any detrimental effects on the components with which they are
used and they shall not cause the test assembly to fail the functional requirements of Clause 7.
5 Pipes
5.1 Classification
5.1.1 General
Pipes shall be classified (see Tables 2 and 3) according to
a) the intended method of installation, i.e. whether open-trench construction or trenchless construction, and
b) the bore shape, i.e. whether circular, egg-shaped or kite-shaped.
5.1.2 Method of installation
Pipes intended to be installed using open-trench techniques shall be classified as such by the use of the letter
“O” in their designation.
Pipes intended to be installed using trenchless techniques, such as jacking, shall be classified as such by the
use of the letter “T” in their designation.
5.1.3 Bore shape
Pipes having a bore shape that is circular shall be classified by the use of the letter “C” in their designation.
Pipes having a bore shape that is egg-shaped shall be classified by the use of the letter “E” in their
designation.
Pipes having a bore shape that is kite-shaped shall be classified by the use of the letter “K” in their
designation.
5.2 Designation
A pipe made in accordance with this part of ISO 18672 shall be designated by adding the appropriate letters
from 5.1.2 and 5.1.3 to the letters PRC, which indicate that it is manufactured from polyester resin concrete.
This procedure produces the designations with respect to the pipe’s classification shown in Table 3.
Table 3 — Designation of polyester resin concrete (PRC) pipes
with respect to the classification
Bore shape Designation
Open-trench construction Trenchless construction,
such as pipe jacking
O T
Circular C PRC-OC PRC-TC
Egg-shaped E PRC-OE PRC-TE
Kite-shaped K PRC-OK PRC-TK
The complete designation of a pipe consists of the number of this part of ISO 18672, the designation with
respect to the classification (see Table 3), the nominal size and the strength class, S . The strength class shall
c
be taken from Table 10, Table 11 or Table 12, as applicable, relative to the pipe’s nominal size, DN or WN/HN,
and classification.
EXAMPLE The designation of a pipe with a kite-shaped bore, a nominal size DN 800 and a strength class
S = 120 N/mm, to be installed using open-trench construction, shall be as follows:
c
ISO 18672-1 PRC-OK DN 800 S = 120 N/mm
c
5.3 Geometrical characteristics
5.3.1 Polyester resin concrete (PRC) pipes with circular bore for installation in open trenches —
PRC-OC
When measured in accordance with 4.3.4, the dimensions d , L, ∆ and t (see Figure 2) shall conform to the
i str sq
applicable values and tolerances according to Table 4 and 5.3.7. The dimensions e, d , L , L and their
a i tot
tolerances shall be specified by the manufacturer in writing at the time of enquiry or delivery.
12 © ISO 2009 – All rights reserved

Key
∆ deviation from straightness L laying length
str
d external diameter L insertion depth of spigot
a i
d internal diameter L total length
i tot
e pipe wall thickness t tolerance on diametrical squareness
sq
Figure 2 — Specified dimensions for pipes designated PRC-OC
Table 4 — Dimensional requirements for pipes designated PRC-OC
Nominal size Maximum deviation Maximum tolerance on
Internal diameter
a
DN from straightness diametrical squareness
d tolerance ∆ t
i str,max sq,max
mm mm mm/m mm/m
150 150
200 200
± 3 5 3
250 250
300 300
400 400 ± 4
6 4
500 500 ± 5
600 600
700 700
800 800 ± 6 7 5
900 900
1000 1 000
1200 1 200
1400 1 400
± 10 6
1500 1 500
1600 1 600
1800 1 800
2000 2 000
2200 2 200
2400 2 400 ± 12 7
2600 2 600
2800 2 800
3000 3 000
a
Applicable dimensions shall be interpolated between the nearest values in this table for other nominal sizes.
5.3.2 Polyester resin concrete (PRC) pipes with egg-shaped bore for installation in open trenches —
PRC-OE
When measured in accordance with 4.3.4, the dimensions w , h , L, w , ∆ and t (see Figure 3) shall
i i p str sq
conform to the applicable values and tolerances according to Table 5 and 5.3.7. The dimensions e , e , e , L ,
1 2 3 i
L and their tolerances shall be specified by the manufacturer in writing at the time of enquiry or delivery.
tot
Key
∆ deviation from straightness L insertion depth of a spigot
str i
e wall thickness at springline L total length
1 tot
e wall thickness at top t tolerance on diametrical squareness
2 sq
e height of pedestal w internal width
3 i
h internal height w width of pedestal
i p
L laying length
Figure 3 — Specified dimensions for pipes designated PRC-OE

14 © ISO 2009 – All rights reserved

Table 5 — Dimensional requirements for pipes designated PRC-OE
Nominal size Internal dimensions Minimum Maximum Maximum
pedestal deviation from tolerance on

a
width straightness diametrical
WN/HN
squareness
w h tolerance w ∆ t
i i p,min str,max sq,max
mm mm mm mm mm/m mm/m
300/450 300 450 ± 3 180 5 3
400/600 400 600 ± 4 240
6 4
500/750 500 750 300
550/1000 550 1 000 ± 5 330
600/900 600 900 360
700/1050 700 1 050 420
700/1200 700 1 200 420
800/1200 800 1 200 ± 6 480
850/1400 850 1 400 510
900/1350 900 1 350 540
1000/1500 1 000 1 500 600
1200/1800 1 200 1 800 ± 10 720
1400/2100 1 400 2 100 840
a
Applicable dimensions shall be interpolated between the nearest values in this table for other nominal sizes.

5.3.3 Polyester resin concrete (PRC) pipes with kite-shaped cross-section for installation in open
trenches — PRC-OK
When measured in accordance with 4.3.4, the dimensions d , L, ∆ and t (see Figure 4) shall conform to the
i str sq
applicable values and tolerances according to Table 6 and 5.3.7. The dimensions e, d , L , L and their
a i tot
tolerances shall be specified by the manufacturer in documents at the time of the enquiry or delivery.

Key
∆ deviation from straightness L laying length
str
d external diameter L insertion depth of a spigot
a i
d internal diameter at springline L total length
i tot
e wall thickness at springline t tolerance on diametrical squareness
sq
Figure 4 — Specified dimensions for pipes designated PRC-OK
Table 6 — Dimensional requirements for pipes designated PRC-OK
Nominal Internal diameter Maximum Maximum tolerance
size deviation from on diametrical
straightness squareness
a
DN
d tolerance t
∆
i sq,max
str,max
mm mm mm/m mm/m
800 800
900 900 ± 6 7 5
1000 1 000
1200 1 200
1400 1 400
8 6
± 10
1600 1 600
1800 1 800
a
Applicable dimensions shall be interpolated between the nearest values in this table for other
nominal sizes.
5.3.4 Polyester resin concrete (PRC) pipes with circular cross-section for installation using
trenchless techniques — PRC-TC
When measured in accordance with 4.3.4, the dimensions d , L, ∆ and t (see Figure 5) shall conform to
a str sq
the applicable values and tolerances according to Table 7 and 5.3.7. The dimensions e, d , d , L , L and their
i e i tot
tolerances shall be specified by the manufacturer in writing at the time of enquiry or delivery.

Key
∆ deviation from straightness L laying length
str
d external diameter L insertion depth of a spigot
a i
d external diameter of a spigot L total length
e tot
d internal diameter at springline t tolerance on diametrical squareness
i sq
e wall thickness at springline
Figure 5 — Specified dimensions for pipes designated PRC-TC
16 © ISO 2009 – All rights reserved

Table 7 — Dimensional requirements for pipes designated PRC-TC
Nominal External diameter Maximum deviation Maximum tolerance on
size from straightness diametrical squareness
a
DN
d tolerance ∆ t
a str,max sq,max
mm mm mm/m mm/m
150 210
200 275
250 360
± 5
300 400
400 550
500 660
5 1,0
600 760
700 860
800 960 ± 6
900 1 100
1000 1 185
1200 1 485
1400 1 720
1500 1 820
± 7 10
1600 1 940
1800 2 160
1,5
2000 2 400
2200 2 630
2400 2 870
± 8 15
2500 2 985
2600 3 100
a
Applicable dimensions shall be interpolated between the nearest values in this table for other
nominal sizes.
5.3.5 Polyester resin concrete (PRC) pipes with egg-shaped internal cross-section and circular
external cross-section for installation using trenchless techniques — PRC-TE
When measured in accordance with 4.3.4, the dimensions d , L, ∆ and t (see Figure 6) shall conform to
a str sq
the applicable values and tolerances according to Table 8 and 5.3.7. The dimensions d , e , e , h , L , L and
e 1 2 i i tot
w and their tolerances shall be specified by the manufacturer in writing at the time of enquiry or delivery.
i
Key
∆ deviation from straightness L laying length
str
d external diameter L insertion depth of a spigot
a i
d external diameter of a spigot L total length
e tot
e wall thickness at springline t tolerance on diametrical squareness
1 sq
e wall thickness at top of pipe w internal width at springline
2 i
h internal height
i
Figure 6 — Specified dimensions for pipes designated PRC-TE
Table 8 — Dimensional requirements for pipes designated PRC-TE
Nominal External diameter Maximum Maximum tolerance on
width/height deviation from diametrical squareness
straightness
a
WN/HN
d tolerance ∆ t
a str,max sq,max
mm mm mm/m mm/m
300/450 660 ± 5
400/600 760
5 1,0
500/750 960
± 6
600/900 1 100
550/1000 1 185
700/1050 1 310
700/1200 1 485
800/1200 1 485
850/1400 1 720 ± 7
10 1,5
900/1350 1 720
1000/1500 1 820
1200/1800 2 160
1400/2100 2 520 ± 8
a
Applicable dimension shall be interpolated between the nearest values in this table for other nominal
sizes.
18 © ISO 2009 – All rights reserved

5.3.6 Polyester resin concrete (PRC) pipes with kite-shaped internal cross-section and circular
external cross-section for installation using trenchless techniques — PRC-TK
When measured in accordance with 4.3.4, the dimensions d , L, ∆ and t (see Figure 7) shall conform to
a str sq
the applicable values and tolerances according to Table 9 and 5.3.7. The dimensions e, d , d , L , L and their
i e i tot
tolerances shall be specified by the manufacturer in documents at the time of the enquiry or delivery.

Key
∆ deviation from straightness L laying length
str
d external diameter L insertion depth of a spigot
a i
d external diameter of a spigot L total length
e tot
d internal diameter at springline t tolerance on diametrical squareness
i sq
e wall thickness at springline
Figure 7 — Specified dimensions for pipes designated PRC-TK
Table 9 — Dimensional requirements for pipes designated PRC-TK
Nominal External diameter Maximum Maximum tolerance
size deviation from on diametrical
straightness squareness
a
DN
d tolerance ∆ t
a str,max sq,max
mm mm mm/m mm/m
800 960
900 1 100 ± 6 5 1,0
1000 1 185
1200 1 485
1400 1 720
1500 1 820 ± 7 10 1,5
1600 1 940
1800 2 160
a
Applicable dimensions shall be interpolated between the nearest values in this table for
other nominal sizes.
5.3.7 Laying lengths (internal barrel lengths)
5.3.7.1 Pipes designated PRC-OC, PRC-OE and PRC-OK
The laying length, L (see 3.1.8), shall be one of the following values:
⎯ for DN u 250: 2 m ± 10 mm;
⎯ for DN > 250: 2 m ± 10 mm or 3 m ± 10 mm;
⎯ for WN: 2 m ± 10 mm.
NOTE Laying lengths other than these can be supplied by agreement between the manufacturer and the purchaser
using the same tolerance.
5.3.7.2 Pipes designated PRC-TC, PRC-TE and PRC-TK
The laying length shall be one of the following values:
⎯ for DN or WN u 400: 1 m ± 10 mm or 2 m ± 10 mm;
⎯ for DN or WN > 400 and DN or WN u 1000: 2 m ± 10 mm;
⎯ for DN or WN > 1000: 3 m ± 10 mm.
NOTE Laying lengths other than these can be supplied by agreement between the manufacturer and the purchaser,
using the same tolerance.
5.4 Mechanical characteristics
5.4.1 Crushing strength
5.4.1.1 Requirements
A pipe shall withstand the applicable minimum crushing load, q , corresponding to its nominal size,
cr,min
classification and strength class, S , as given in Table 10, Table 11 or Table 12, as applicable.
c
The minimum crushing load, q , is determined using Equation (1) or Equation (2), as applicable:
cr,min
qS=× DN× 0,001 (1)
⎡⎤
cr,min c⎣⎦
qS=× WN× 0,001 (2)
⎡⎤
cr,min c⎣⎦
It is expressed in newtons per millimetre length (N/mm).
Table 10 — Minimum strength classes for pipes
designated PRC-OC or PRC-TC
Nominal size Strength class
S
c
DN
N/mm
PRC-OC PRC-TC
150 u DN u 500 140 160
600 u DN u 1000 120 140
1200 u DN u 3000 90 120
20 © ISO 2009 – All rights reserved

Table 11 — Minimum strength classes for pipes
designated PRC-OE or PRC-TE
Nominal width/height Strength class
S
c
WN/HN
N/mm
PRC-OE PRC-TE
300/450 u WN/HN u 600/900 140 160
700/1050 u WN/HN u 1000/1500 120 140
1200/1800 u WN/HN u 1400/2100 90 120

Table 12 — Minimum strength classes for pipes
designated PRC-OK or PRC-TK
Nominal size Strength class
S
c
DN
N/mm
PRC-OK PRC-TK
800 u DN u 1000 120 140
1200 u DN u 1800 90 120
The pipe shall be tested in accordance with Annex A, or, if suitable apparatus is not available, in accordance
with Annex B using test pieces sawn from a pipe.
5.4.1.2 Test pieces
When testing in accordance with Annex A, the test piece shall be a length of pipe, with or without a socket,
with a laying length of at least the applicable value from Table 13.
When testing in accordance with Annex B, the test piece shall be a piece sawn from a pipe or a broken piece
of a pipe. When testing pipes with kite-shaped or egg-shaped cross-section the test piece shall be taken from
the top of the pipe. The test piece shall have parallel boundary surfaces. The length, l , in the circumferential
p
direction, shall be about five times the wall thickness and its width, b, in the longitudinal direction, about three
times the wall thickness. The longitudinal sides of the test piece shall be perpendicular to the generated
surface of the pipe. Three test pieces shall be taken from a pipe and the average of the results from the three
tests is the test result.
Table 13 — Minimum length of a test piece
Nominal size Nominal si
...