ISO 4437:2007
(Main)Buried polyethylene (PE) pipes for the supply of gaseous fuels — Metric series — Specifications
Buried polyethylene (PE) pipes for the supply of gaseous fuels — Metric series — Specifications
ISO 4437:2007 specifies the general properties of the polyethylene (PE) compounds for the manufacture of pipes, the physical and mechanical properties of the pipes made from these compounds and the requirements for the marking of such pipes, intended to be used for the supply of gaseous fuels.
Canalisations enterrées en polyéthylène (PE) pour réseaux de distribution de combustibles gazeux — Série métrique — Spécifications
General Information
Relations
Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 4437
Third edition
2007-06-15
Buried polyethylene (PE) pipes for the
supply of gaseous fuels — Metric
series — Specifications
Canalisations enterrées en polyéthylène (PE) pour réseaux de
distribution de combustibles gazeux — Série métrique — Spécifications
Reference number
ISO 4437:2007(E)
©
ISO 2007
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ISO 4437:2007(E)
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ii © ISO 2007 – All rights reserved
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ISO 4437:2007(E)
Contents Page
Foreword. iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions. 3
4 PE compound. 5
4.1 Technical data . 5
4.2 Change in compound quality . 5
4.3 Identification compound . 5
4.4 Rework material . 5
4.5 Characteristics of PE compound . 5
4.6 Fusion compatibility of PE compound . 5
4.7 Classification. 5
5 Pipes. 8
5.1 Appearance . 8
5.2 Geometrical characteristics. 8
5.3 Mechanical characteristics . 12
5.4 Physical characteristics. 13
5.5 Fusion compatibility for butt-fusion joints . 13
5.6 Minimum required marking. 14
Annex A (normative) Resistance to gas constituents. 15
Annex B (informative) Design guidance . 16
Annex C (normative) Pipes with co-extruded layers . 18
Annex D (normative) Pipes with peelable layer . 19
Annex E (informative) Squeeze-off technique. 21
Bibliography . 22
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ISO 4437:2007(E)
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 4437 was prepared by Technical Committee ISO/TC 138, Plastics pipes, fittings and valves for the
transport of fluids, Subcommittee SC 4, Plastics pipes and fittings for the supply of gaseous fuels.
This third edition cancels and replaces the second edition (ISO 4437:1997), which has been technically
revised as follows. A clear distinction has been made between requirements on compounds and requirements
on pipes. Substantial changes have been made in introducing specifications for pipes, including additional
layers, and in amending the relationship of the S4 critical pressure to the maximum operating pressure and FS
critical pressure. An informative annex (Annex B) has been added, giving an alternative design approach
using a pre-set, overall service (design) coefficient. Normative references have been updated and changed as
appropriate. It also incorporates the Technical Corrigendum ISO 4437:1997/Cor.1:1999.
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INTERNATIONAL STANDARD ISO 4437:2007(E)
Buried polyethylene (PE) pipes for the supply of gaseous
fuels — Metric series — Specifications
1 Scope
This International Standard specifies the general properties of the polyethylene (PE) compounds for the
manufacture of pipes, the physical and mechanical properties of the pipes made from these compounds, and
the requirements for the marking of such pipes, intended to be used for the supply of gaseous fuels.
It deals with three types of pipe:
⎯ PE pipes (outside diameter d ) including any identification stripes;
n
⎯ PE pipes with co-extruded layers on either or both the outside and/or inside of the pipe (total outside
diameter d ) as specified in Annex C, where all layers have the same MRS rating;
n
⎯ PE pipes (outside diameter d ) with a peelable, contiguous thermoplastics additional layer on the outside
n
of the pipe (“coated pipe”) as specified in Annex D.
This International Standard also gives guidance on a calculation and design scheme on which the maximum
operating pressure (MOP) of the pipes is based. The pipes are intended to be buried.
NOTE For above-ground application of pipes conforming to this International Standard, the pipes need always to be
protected by a casing pipe.
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 3, Preferred numbers — Series of preferred numbers
ISO 161-1, Thermoplastics pipes for the conveyance of fluids — Nominal outside diameters and nominal
pressures — Part 1: Metric series
ISO 497, Guide to the choice of series of preferred numbers and of series containing more rounded values of
preferred numbers
ISO 1133, Plastics — Determination of the melt mass-flow rate (MFR) and the melt volume-flow rate (MVR) of
thermoplastics
ISO 1167-1, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids — Determination of
the resistance to internal pressure — Part 1: General method
ISO 1167-2, Thermoplastics pipes, fittings and assemblies for the conveyance of fluids — Determination of
the resistance to internal pressure — Part 2: Preparation of pipe test pieces
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ISO 4437:2007(E)
ISO 1183 (all parts), Plastics — Methods for determining the density of non-cellular plastics
ISO 2505, Thermoplastics pipes — Longitudinal reversion — Test method and parameters
ISO 3126, Plastics piping systems — Plastics components — Determination of dimensions
ISO 4065, Thermoplastics pipes — Universal wall thickness table
ISO 6259-1, Thermoplastics pipes — Determination of tensile properties — Part 1: General test method
ISO 6259-3, Thermoplastics pipes — Determination of tensile properties — Part 3: Polyolefin pipes
ISO 6964, Polyolefin pipes and fittings — Determination of carbon black content by calcination and pyrolysis —
Test method and basic specification
ISO 8085-3, Polyethylene fittings for use with polyethylene pipes for the supply of gaseous fuels — Metric
series — Specifications — Part 3: Electrofusion fittings
ISO 9080, Plastics piping and ducting systems — Determination of the long-term hydrostatic strength of
thermoplastics materials in pipe form by extrapolation
ISO 11357-6, Plastics — Differential scanning calorimetry (DSC) — Part 6: Determination of oxidation
1)
induction time (isothermal OIT) and oxidation induction temperature (dynamic OIT)
ISO 11413, Plastics pipes and fittings — Preparation of test piece assemblies between a polyethylene (PE)
pipe and an electrofusion fitting
ISO 11414:1996, Plastics pipes and fittings — Preparation of polyethylene (PE) pipe/pipe or pipe/fitting test
piece assemblies by butt fusion
ISO 11922-1:1997, Thermoplastics pipes for the conveyance of fluids — Dimensions and tolerances — Part 1:
Metric series
ISO 12162:1995, Thermoplastics materials for pipes and fittings for pressure applications — Classification and
designation — Overall service (design) coefficient
ISO 13477, Thermoplastics pipes for the conveyance of fluids — Determination of resistance to rapid crack
propagation (RCP) — Small-scale steady-state test (S4 test)
ISO 13478, Thermoplastics pipes for the conveyance of fluids — Determination of resistance to rapid crack
propagation (RCP) — Full-scale test (FST)
ISO 13479, Polyolefin pipes for the conveyance of fluids — Determination of resistance to crack propagation —
Test method for slow crack growth on notched pipes (notch test)
ISO 13480, Polyethylene pipes — Resistance to slow crack growth — Cone test method
ISO 13953, Polyethylene (PE) pipes and fittings — Determination of the tensile strength and failure mode of
test pieces from a butt-fused joint
ISO 13954, Plastics pipes and fittings — Peel decohesion test for polyethylene (PE) electrofusion assemblies
of nominal outside diameter greater than or equal to 90 mm
ISO 15512, Plastics — Determination of water content
1) To be published. (Revision of ISO 11357-6:2002)
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ISO 4437:2007(E)
ISO 16871, Plastics piping and ducting systems — Plastics pipes and fittings — Method for exposure to direct
(natural) weathering
ISO 18553, Method for the assessment of the degree of pigment or carbon black dispersion in polyolefin pipes,
fittings and compounds
ASTM D3849, Standard test method for carbon black — Morphological characterization of carbon black using
electron microscopy
EN 12099, Plastics piping systems — Polyethylene piping materials and components — Determination of
volatile content
3 Terms and definitions
For the purpose of this document, the following terms and definitions apply.
3.1
nominal outside diameter
d
n
numerical designation of size which is common to all components in a thermoplastics piping system other than
flanges and components designated by thread size
NOTE 1 It is a convenient round number for reference purposes.
NOTE 2 For metric pipes conforming to ISO 161-1, the nominal outside diameter, expressed in millimetres, is the
minimum mean outside diameter, d .
em,min
3.2
mean outside diameter
d
em
measured length of the outer circumference of the pipe divided by π, rounded up to the nearest 0,1 mm
NOTE The value for π is taken to be 3,142.
3.3
minimum mean outside diameter
d
em,min
minimum mean outside diameter of the pipe
3.4
maximum mean outside diameter
d
em,max
maximum mean outside diameter of the pipe
3.5
out-of-roundness
ovality
difference between the measured maximum outside diameter and the measured minimum outside diameter in
the same cross-sectional plane of the pipe
3.6
nominal wall thickness
e
n
wall thickness, in millimetres, tabulated in ISO 4065, corresponding to the minimum wall thickness e at
y,min
any point e
y
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ISO 4437:2007(E)
3.7
wall thickness at any point
e
y
measured wall thickness at any point around the circumference of the pipe, rounded up to the nearest 0,1 mm
3.8
minimum wall thickness
e
y,min
minimum wall thickness of the pipe
3.9
standard dimension ratio
SDR
ratio of the nominal outside diameter of the pipe to its nominal wall thickness
d
n
SDR =
e
n
3.10
lower confidence limit of predicted hydrostatic strength
σ
LPL
quantity with the dimension of stress, which represents the 97,5 % lower confidence limit of the predicted
hydrostatic strength for a single value at a temperature T and a time t
NOTE It is denoted as σ = σ .
LPL (T,t,0,975)
3.11
minimum required strength
MRS
value of σ at a temperature of 20 °C and a time of 50 years (σ ), rounded down to the next
LPL (20,50years,0,975)
smaller value of the R10 series or of the R20 series conforming to ISO 3, ISO 497 and ISO 12162, depending
on the value of σ
LPL
3.12
gaseous fuel
any fuel which is in the gaseous state at a temperature of 15 °C and a pressure of 1 bar
5 2
NOTE 1 bar = 0,1 MPa = 10 Pa; 1 MPa = 1 N/mm .
3.13
maximum operating pressure
MOP
maximum effective pressure of the gas in a piping system, expressed in bar, which is allowed for continuous
use
NOTE 1 It takes into account the physical and the mechanical characteristics of the components of the piping system
and the influence of the gas on these characteristics.
5 2
NOTE 2 1 bar = 0,1 MPa = 10 Pa; 1 MPa = 1 N/mm .
3.14
compound
homogeneous extruded mixture of base polymer (PE) and additives, i.e. antioxidants, pigments, UV-stabilizers
and others, at a dosage level necessary for the processing and use of components conforming to the
requirements of this International Standard
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ISO 4437:2007(E)
3.15
rework material
unused material from a manufacturer's retained production that has been reground, granulated or pelletized
for reuse by that same manufacturer
4 PE compound
4.1 Technical data
The technical data concerning the materials used, relevant to the performance of the pipe, shall be made
available to the purchaser of the compound by the compound manufacturer.
4.2 Change in compound quality
Any change in dosage levels or processing of the compound affecting the performance of the pipe may
require a new qualification of the compound.
NOTE Guidelines can be found in Bibliographic references [4] and [6].
4.3 Identification compound
Where applicable, the compound used for identification stripes shall be made from the same base resin as
one of the pipe compounds for which fusion compatibility of pipes is proven by the pipe manufacturer.
4.4 Rework material
Clean rework material may be used, provided that it is derived from the same pipe and/or fitting compound as
used for the relevant production.
4.5 Characteristics of PE compound
The PE compound shall be in accordance with Tables 1 and 2.
4.6 Fusion compatibility of PE compound
The compound manufacturer shall demonstrate fusion compatibility for the compounds of his own product
range by checking that the requirement for tensile strength given in Table 3 is fulfilled for butt-fusion joints
prepared using the parameters specified in ISO 11414:1996, Annex A, at an ambient temperature of
(23 ± 2) °C.
4.7 Classification
PE compounds shall be classified by MRS in accordance with Table 4.
The classification in accordance with ISO 12162 shall be given and demonstrated by the compound producer.
The long-term hydrostatic strength of the compound shall be evaluated in accordance with ISO 9080, with
pressure tests performed at least three temperatures, where two of the temperatures are fixed to 20 °C and
80 °C, and the third temperature free between 30 °C and 70 °C. At 80 °C, there shall be no knee detected in
the regression curve at t < 5 000 h.
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ISO 4437:2007(E)
Table 1 — Characteristics of PE compound
Characteristic Unit Requirement Test parameter Test method
a 3
Density kg/m W 930 23 °C ISO 1183
b
Melt flow rate g/10 min ± 20 % of the condition T ISO 1133
nominated value or
± 0,1 g/10 min,
whichever is the
greatest
c
Thermal stability min > 20 200 °C ISO 11357-6
d
Volatile content mg/kg u 350 EN 12099
d, e
Water content mg/kg u 300 ISO 15512
f
Carbon black content % (mass 2,0 % to 2,5 % ISO 6964
fraction)
Grade u 3
Carbon black or pigment dispersion ISO 18553
Rating of
A1,A2,A3 or B
appearance
f
Carbon black particle size nm 10 to 25 ASTM D3849
a
For the base polymer only.
b
The condition used for determining the MFR shall be related to the conditions used by the manufacturer.
c
Testing may be carried out at 210 °C provided there is clear correlation with the results at 200 °C. In case of dispute, the reference
temperature shall be 200 °C.
d
This test method may be used for quality control purposes.
e
Only applicable if the compound does not conform to the requirement for volatile content. In case of dispute, the requirement for
water content shall be decisive. The requirement applies to the compound producer at the stage of compound manufacturing and to the
compound user at the stage of processing (if the water content exceeds the limit, drying is required prior to use).
f
Only applicable for black compounds.
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ISO 4437:2007(E)
Table 2 — Characteristics of PE compound — Tested in pipe form
Characteristic Unit Requirement Test parameter Test method
80 °C
Resistance to gas constituents h W 20 Annex A
2 MPa
p W 1,5 × MOP
Resistance to rapid crack propagation
c
with
(RCP):
bar 0 °C ISO 13477
p = 3,6 × p + 2,6
c cS4
S4 test (e W 15 mm) a
(in bar)
b
80 °C; 8,0 bar
Resistance to slow crack growth h W 500 ISO 13479
c
80 °C; 9,2 bar
2 e
Resistance to weathering — After weathering E W 3,5 GJ/m ISO 16871
(for non-black compounds only)
Hydrostatic strength 80 °C; W1 000 h ISO 1167-1
d
of pipe ISO 1167-2
W 350 % ISO 6259-1
Elongation at break of pipe
ISO 6259-3
23 °C; u 33,3 % ISO 13954
De-cohesion of an f
ISO 11413
electrofusion joint —
Jointing condition 1
percentage brittle failure
ISO 8085-3
a
The full-scale/S4 correlation factor is equal to 3,6 and is defined by the formula:
p + p = 3,6 (p + p )
cFS atm cS4 atm
where p is the full-scale test critical pressure, p is the atmospheric pressure, and p is the small-scale, steady-state (S4) test
cFS atm cS4
critical pressure.
NOTE Attention is drawn to the fact that the correlation factor could be modified.
If the requirement is not met, then retest using the full-scale test ISO 13478. In this case, critical pressure p = p .
c c,FS
b
Test parameter for PE 80, d 110 mm or 125 mm, SDR 11.
n
c
Test parameter for PE 100, d 110 mm or 125 mm, SDR 11.
n
d
Test parameter for PE 80: 4,0 MPa. Test parameter for PE 100: 5,0 MPa.
e 2
The value of 3,5 GJ/m represents the yearly exposure to sunlight near the 50th degree of latitude. This value might not be
appropriate for other global locations, in which case, national standards and regulations will apply.
f
ISO 11413:1996 does not take into account peelable pipe. It is intended that its next revision will cover this aspect.
Table 3 — Characteristic of PE compound — Tested in butt-fusion joint form
Characteristic Unit Requirement Test parameter Test method
Test to failure:
Tensile strength for butt fusion
— Ductile — Pass 23 °C ISO 13953
(d : 110 mm or 125 mm — SDR 11)
n
Brittle — Fail
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ISO 4437:2007(E)
Table 4 — Classification of PE compounds
MRS
σ
(20 °C, 50 years, 0,975)
Designation
MPa MPa
PE 80 8,00 to 9,99 8,0
PE 100 W 10,00 10,0
2)
5 Pipes
5.1 Appearance
When viewed without magnification, the internal and external surfaces shall be smooth, clean and free from
scoring, cavities and other surface defects which may affect pipe performance. The pipe ends shall be cut
cleanly and square to the axis of the pipe.
5.2 Geometrical characteristics
5.2.1 General
The dimensions of the pipe shall be measured not less than 24 h after manufacture in accordance with
ISO 3126 after having being conditioned at (23 ± 2) °C for at least 4 h.
5.2.2 Mean outside diameter and out-of-roundness (ovality) and their tolerances
The mean outside diameter d , the out-of-roundness (ovality) and their tolerances shall be in accordance
e,m
with Table 5.
Grade B tolerances in accordance with ISO 11922-1 shall apply.
5.2.3 Wall thicknesses and their tolerances
The minimum wall thickness e shall be in accordance with Table 6. Small pipe diameters are
y,min
characterized by wall thickness. Large pipe diameters are characterized by SDR. All SDR values may be used,
taken from series stated in ISO 4065 and ISO 161-1.
NOTE The minimum required wall thickness for pipes with a nominal diameter of 75 mm or lower does not, in all
cases, conform with ISO 4065.
The tolerance on the wall thickness at any point shall conform to of ISO 11922-1:1997, Grade V. The
maximum permitted positive deviation between the minimum wall thickness e and the wall thickness at
y,min
any point e shall conform to Table 7.
y
2) Specifications for pipes with co-extruded and peelable layers are given in Annexes C and D.
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ISO 4437:2007(E)
5.2.4 Circumferential reversion
The circumferential reversion of pipes (“tow-in”) with a d equal to or greater than 250 mm shall be determined
n
between 24h and 48h after manufacturing and after a conditioning in water at 80 °C. The conditioning shall be
in accordance with ISO 1167-1 and 1167-2. The pipe test pieces shall be 3d in length. With the test piece at
n
(23 ± 2) °C, circumferential measurement shall be made to establish d . The difference between d
em em
measurement made at distance of 1,0d and 0,1d , respectively, from the end of the test piece shall not be
n n
greater than the d tolerance range (grade B) specified in Table 5.
em
Table 5 — Mean outside diameters and out-of-roundness
Dimensions in millimetres
Maximum of absolute out-of-roundness
Nominal outside
d
em, max
a
d (ovality)
diameter
em,min
d
n
b
Grade B
Grade K Grade N
16 16,0 16,3 1,2 1,2
20 20,0 20,3 1,2 1,2
25 25,0 25,3 1,5 1,2
32 32,0 32,3 2,0 1,3
40 40,0 40,4 2,4 1,4
50 50,0 50,4 3,0 1,4
63 63,0 63,4 3,8 1,5
75 75,0 75,5 — 1,6
90 90,0 90,6 — 1,8
110 110,0 110,7 — 2,2
125 125,0 125,8 — 2,5
140 140,0 140,9 — 2,8
160 160,0 161,0 — 3,2
180 180,0 181,1 — 3,6
200 200,0 201,2 — 4,0
225 225,0 226,4 — 4,5
250 250,0 251,5 — 5,0
280 280,0 281,7 — 9,8
315 315,0 316,9 — 11,1
355 355,0 357,2 — 12,5
400 400,0 402,4 — 14,0
450 450,0 452,7 — 15,6
500 500,0 503,0 — 17,5
560 560,0 563,4 — 19,6
630 630,0 633,8 — 22,1
a
Measurement of out-of-roundness shall be made at the point of manufacture according to ISO 3126.
b
For coiled pipe with d u 63 mm, grade K applies; for pipe with d W 75 mm, the maximum out-of roundness shall be specified by
n n
agreement.
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ISO 4437:2007(E)
Table 6 — Minimum wall thickness
Dimensions in millimetres
Nominal Minimum wall thickness
e
outside
y,min
diameter
a a b
SDR 9 SDR 11 SDR 13,6 SDR 17 SDR 17,6 SDR 21 SDR 26
d
n
d
16 3,0 2,3 — — — — —
d
20 3,0 2,3 — — — — —
d c
25 3,0 2,3 2,0 — — — —
d c c
32 3,6 3,0 2,4 2,0 2,0 — —
d d c
40 4,5 3,7 3,0 2,4 2,3 2,0 —
d d c
50 5,6 4,6 3,7 3,0 2,9 2,4 2,0
d
63 7,1 5,8 4,7 3,8 3,6 3,0 2,5
d
75 8,4 6,8 5,6 4,5 4,3 3,6 2,9
90 10,1 8,2 6,7 5,4 5,2 4,3 3,5
110 12,3 10,0 8,1 6,6 6,3 5,3 4,2
125 14,0 11,4 9,2 7,4 7,1 6,0 4,8
140 15,7 12,7 10,3 8,3 8,0 6,7 5,4
160 17,9 14,6 11,8 9,5 9,1 7,7 6,2
180 20,1 16,4 13,3 10,7 10,3 8,6 6,9
200 22,4 18,2 14,7 11,9 11,4 9,6 7,7
225 25,2 20,5 16,6 13,4 12,8 10,8 8,6
250 27,9 22,7 18,4 14,8 14,2 11,9 9,6
280 31,3 25,4 20,6 16,6 15,9 13,4 10,7
315 35,2 28,6 23,2 18,7 17,9 15,0 12,1
355 39,7 32,2 26,1 21,1 20,2 16,9 13,6
400 44,7 36,4 29,4 23,7 22,8 19,1 15,3
450 50,3 40,9 33,1 26,7 25,6 21,5 17,2
500 55,8 45,5 36,8 29,7 28,4 23,9 19,1
560 — 50,9 41,2 33,2 31,9 26,7 21,4
630 — 57,3 46,3 37,4 35,8 30,0 24,1
a
Preferred series.
b
SDR 17,6 series might be removed at the next revision of this International Standard.
c
For practical reasons, electrofusion and butt fusion of pipe of 2,0 mm wall thickness is not recommended.
d
Minimum wall thickness values greater than limits of 2,3 mm, 2,4 mm and 2,9 mm may be imposed for practical reasons in
accordance with national requirements. See manufacturer's technical files or national specifications for advice.
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ISO 4437:2007(E)
Table 7 — Tolerances on wall thickness at any point
Dimensions in millimetres
Minimum wall thickness Minimum wall thickness
Permitted positive Permitted positive
e e
y,min y,min
deviation deviation
u u
> >
2,0 3,0 0,4 30,0 31,0 3,2
3,0 4,0 0,5 31,0 32,0 3,3
4,0 5,0 0,6 32,0 33,0 3,4
5,0 6,0 0,7 33,0 34,0 3,5
6,0 7,0 0,8 34,0 35,0 3,6
7,0 8,0 0,9 35,0 36,0 3,7
8,0 9,0 1,0 36,0 37,0 3,8
9,0 10,0 1,1 37,0 38,0 3,9
10,0 11,0 1,2 38,0 39,0 4,0
11,0 12,0 1,3 39,0 40,0 4,1
12,0 13,0 1,4 40,0 41,0 4,2
13,0 14,0 1,5 41,0 42,0 4,3
14,0 15,0 1,6 42,0 43,0 4,4
15,0 16,0 1,7 43,0 44,0 4,5
16,0 17,0 1,8 44,0 45,0 4,6
17,0 18,0 1,9 45,0 46,0 4,7
18,0 19,0 2,0 46,0 47,0 4,8
19,0 20,0 2,1 47,0 48,0 4,9
20,0 21,0 2,2 48,0 49,0 5,0
21,0 22,0 2,3 49,0 50,0 5,1
22,0 23,0 2,4 50,0 51,0 5,2
23,0 24,0 2,5 51,0 52,0 5,3
24,0 25,0 2,6 52,0 53,0 5,4
25,0 26,0 2,7 53,0 54,0 5,5
26,0 27,0 2,8 54,0 55,0 5,6
27,0 28,0 2,9 55,0 56,0 5,7
28,0 29,0 3,0 56,0 57,0 5,8
29,0 30,0 3,1 57,0 58,0 5,9
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ISO 4437:2007(E)
5.3 Mechanical characteristics
When tested in accordance with the test methods as specified in Table 8 using the indicated parameters, the
pipe shall have mechanical characteristics conforming to the requirements given in Table 8.
NOTE For information about providing evid
...
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