ISO 8085-1:2001

Polyethylene fittings for use with polyethylene pipes for the supply of gaseous fuels — Metric series — Specifications — Part 1: Fittings for socket fusion using heated tools

Raccords en polyéthylène pour utilisation avec des tubes en polyéthylène pour la distribution de combustibles gazeux — Série métrique — Spécifications — Partie 1: Raccords à emboîture à souder au moyen d'outils chauffés

General Information

• Status: Withdrawn
• Publication Date: 12-Sep-2001
• Withdrawal Date: 12-Sep-2001
• ICS: 75.200 - Petroleum products and natural gas handling equipment
• ICS: 83.140.30 - Plastics pipes and fittings for non fluid use
• Technical Committee: ISO/TC 138/SC 4 - Plastics pipes and fittings for the supply of gaseous fuels
• Drafting Committee: ISO/TC 138/SC 4 - Plastics pipes and fittings for the supply of gaseous fuels
• Current Stage: 9599 - Withdrawal of International Standard
• Completion Date: 13-Jan-2014

Relations

• Revised: ISO 4437-3:2014 - Plastics piping systems for the supply of gaseous fuels — Polyethylene (PE) — Part 3: Fittings
• Effective Date: 29-Jan-2011

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 8085-1
First edition
2001-09-01
Polyethylene fittings for use with
polyethylene pipes for the supply of
gaseous fuels — Metric series —
Specifications —
Part 1:
Fittings for socket fusion using heated
tools
Raccords en polyéthylène pour utilisation avec des tubes en polyéthylène
pour la distribution de combustibles gazeux — Série métrique —
Spécifications —
Partie 1: Raccords à emboîture à souder au moyen d'outils chauffés
Reference number
ISO 8085-1:2001(E)
©
ISO 2001

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ISO 8085-1:2001(E)
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ii © ISO 2001 – All rights reserved

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ISO 8085-1:2001(E)
Contents Page
Foreword.iv
1 Scope .1
2 Normative references .1
3 Terms and definitions .2
4 Symbols .4
5 Material .5
6 General requirements.7
7 Geometrical characteristics.8
8 Mechanical characteristics .10
9 Physical characteristics.13
10 Technical file .13
11 Marking .13
12 Packaging.14
Annex A (normative) Formulae for calculating the equivalent dimensions of non-metric fitting series.15
Annex B (normative) Short-term pressure test method.18
Annex C (normative) Tensile test for fitting/pipe assemblies .20
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ISO 8085-1:2001(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 3.
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 part of ISO 8085 may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
International Standard ISO 8085-1 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.
ISO 8085 consists of the following parts, under the general title Polyethylene fittings for use with polyethylene pipes
for the supply of gaseous fuels — Metric series — Specifications:
— Part 1: Fittings for socket fusion using heated tools
— Part 2: Spigot fittings for butt fusion, for socket fusion using heated tools and for use with electrofusion fittings
— Part 3: Electrofusion fittings
Annexes A, B and C form a normative part of this part of ISO 8085.
iv © ISO 2001 – All rights reserved

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INTERNATIONAL STANDARD ISO 8085-1:2001(E)
Polyethylene fittings for use with polyethylene pipes for the supply
of gaseous fuels — Metric series — Specifications —
Part 1:
Fittings for socket fusion using heated tools
1 Scope
This part of ISO 8085 specifies the requirements for polyethylene (PE) socket fusion fittings intended to be used
with PE pipes and fittings for the supply of gaseous fuels.
In addition, it specifies some general properties of the material from which these fittings are made.
This part of ISO 8085 also lays down requirements for dimensions and performance of such fittings.
It is applicable to socket fusion fittings designed to be fusion-jointed to PE pipes conforming to ISO 4437, and to
spigot fittings conforming to ISO 8085-2.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of
this part of ISO 8085. For dated references, subsequent amendments to, or revisions of, any of these publications
do not apply. However, parties to agreements based on this part of ISO 8085 are encouraged to investigate the
possibility of applying the most recent editions of the normative documents indicated below. For undated
references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain
registers of currently valid International Standards.
ISO 3:1973, Preferred numbers� Series of preferred numbers
ISO 497:1973, Guide to the choice of series of preferred numbers and of series containing more rounded values of
preferred numbers
ISO 1133:1997, Plastics� Determination of the melt mass-flow rate (MFR) and the melt volume-flow rate (MVR) of
thermoplastics
ISO 1167:1996, Thermoplastics pipes for the conveyance of fluids� Resistance to internal pressure� Test
method
ISO 1183 (all parts), Plastics — Methods for determining the density of non-cellular plastics
ISO 1872-1:1993, Plastics� Polyethylene (PE) moulding and extrusion materials� Part 1: Designation system
and basis for specifications
1)
ISO 3126:— , Plastics piping systems — Plastics piping components — Measurement and determination of
dimensions
1) To be published. (Revision of ISO 3126:1974)
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ISO 8085-1:2001(E)
ISO 4437:1997, Buried polyethylene (PE) pipes for the supply of gaseous fuels� Metric series� Specifications
ISO 6964:1986, Polyolefin pipes and fittings � Determination of carbon black content by calcination and
pyrolysis — Test method and basic specification
ISO 8085-2:2001, Polyethylene fittings for use with polyethylene pipes for the supply of gaseous fuels — Metric
series — Specifications — Part 2: Spigot fittings for butt fusion, for socket fusion using heated tools and for use
with electrofusion fittings
ISO 8085-3:2001, Polyethylene fittings for use with polyethylene pipes for the supply of gaseous fuels� Metric
series� Specifications — Part 3: Electrofusion fittings
ISO 9356:1989, Polyolefin pipe assemblies with or without jointed fittings — Resistance to internal pressure — Test
method
2)
ISO 9080:— , Plastics piping and ducting systems — Determination of the long-term hydrostatic strength of
thermoplastics materials in pipe form by extrapolation
ISO/TR 10837:1991, Determination of the thermal stability of polyethylene (PE) for use in gas pipes and fittings
ISO/TS 10839:2000, Polyethylene pipes and fittings for the supply of gaseous fuels — Code of practice for design,
handling and installation
ISO 12162:1995, Thermoplastics materials for pipes and fittings for pressure applications� Classification and
designation� Overall service (design) coefficient
ISO 13477:1997, Thermoplastics pipes for the conveyance of fluids� Determination of resistance to rapid crack
propagation (RCP)� Small-scale steady-state test (S4 test)
ISO 13478:1997, Thermoplastics pipes for the conveyance of fluids� Determination of resistance to rapid crack
propagation (RCP)� Full-scale test (FST)
ISO 13479:1997, 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 13951:2001, Plastics piping systems — Test method for the resistance of polyolefin pipe/pipe or pipe/fitting
assemblies to tensile loading
3)
ISO 18553:— , Method for the assessment of pigment or carbon black dispersion in polyolefin pipes, fittings and
compounds
ASTM D 4019-94, Standard Test Method for Moisture in Plastics by Coulometric Regeneration of Phosphorus
Pentoxide
3 Terms and definitions
For the purposes of this part of ISO 8085, the following terms and definitions apply.
3.1 Geometrical definitions
3.1.1
nominal diameter of a fitting
d
n
the nominal diameter of a fitting is taken as the nominal diameter of the corresponding pipe series
2) To be published. (Revision of ISO/TR 9080:1992)
3) To be published. (Revision of ISO 11420:1996 and ISO 13949:1997)
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ISO 8085-1:2001(E)
3.1.2
nominal wall thickness of a fitting
e
n
the nominal wall thickness of a fitting is taken as the nominal wall thickness of the corresponding pipe series
3.1.3
mean inside diameter
arithmetic mean of at least two inside diameters measured at right angles to each other in transverse planes
3.1.4
out-of-roundness of a socket
maximum inside diameter minus the minimum inside diameter of the socket, measured in the same plane, parallel
to the plane of the mouth
3.1.5
maximum out-of-roundness of a socket
greatest value of the out-of-roundness between the plane of the mouth and a plane separated from it by a distance
L (the socket reference length)
3.1.6
socket taper
included angle at the vertex of the triangle corresponding to the longitudinal cross-section of a cone based on the
mean socket-mouth diameter, the mean socket-root diameter and the reference length of the socket
3.1.7
standard dimension ratio of a fitting
SDR
the SDR value of a fitting is taken as being the same as that of the corresponding pipe series
d
n
SDR =
e
n
3.1.8
wall thickness of a fitting
E
wall thickness at any point of the body of the fitting which could be subjected to the full stress induced by the
pressure of the gas in the piping system
3.2 Material definitions
3.2.1
virgin material
thermoplastics material in a form such as granules or powder which has not been previously processed other than
for compounding and to which no reprocessable or recyclable materials have been added
3.2.2
reprocessable material
thermoplastics material prepared from clean unused rejected pipes, fittings or valves, produced in a manufacturer’s
plant by a process such as injection-moulding or extrusion, which will be reprocessed in the same plant
NOTE Such material may include trimmings from the production of such pipes, fittings and valves.
3.2.3
compound
homogenous mixture of base polymer (PE) and additives, e.g. anti-oxidants, pigments and UV-stabilizers, at
concentrations necessary for the particular application
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ISO 8085-1:2001(E)
3.3 Definitions related to material characteristics
3.3.1
lower confidence limit
�
lcl
quantity with the dimensions of stress, in megapascals, which can be considered as a property of the material and
represents the 97,5 % lower confidence limit of the mean long-term hydrostatic strength at 20 °C for 50 years
determined by pressurizing internally with water
3.3.2
overall service (design) coefficient
C
overall coefficient, with a value larger than 1,0, which takes into consideration service conditions as well as
properties of the components of a piping system other than those represented in the lower confidence limit
NOTE For gas applications, C can have any value equal to or greater than 2,0.
3.3.3
minimum required strength
MRS
the value of � rounded down to the next lower value in the R 10 series when � is less than 10 MPa, or to the
lcl lcl
next lower value in the R 20 series when� is greater than or equal to 10 MPa
lcl
NOTE The R 10 and R 20 series are the Renard number series as defined in ISO 3 and ISO 497.
3.3.4
melt mass-flow rate
MFR
value relating to the viscosity of molten thermoplastic material at a specified temperature and rate of shear
3.4 Definitions related to service conditions
3.4.1
gaseous fuel
4�
any fuel which is in the gaseous state at a temperature of +15 °C and a pressure of 1 bar
3.4.2
maximum operating pressure
MOP
maximum effective pressure of the gas in a piping system, expressed in bars, which is allowed in continuous use
NOTE It takes into account the physical and the mechanical characteristics of the components of a piping system and is
given by the equation:
20� MRS
MOP �
C��(SDR 1)
4 Symbols
The dimensions and symbols used in this part of ISO 8085 are shown in Figure 1, where
D is the mean inside diameter of the socket mouth, i.e. the mean diameter of the circle at the intersection of the
1
extension of the socket with the plane of the socket mouth.
5 2
4� 1 bar = 10 N/m =0,1 MPa
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ISO 8085-1:2001(E)
D is the mean inside diameter of the socket root, i.e. the mean diameter of the circle in a plane parallel to the
2
plane of the mouth and separated from it by a distance L which is the reference length of the socket.
D is the minimum bore, i.e. the minimum diameter of the flow channel through the body of the fitting.
3
L is the reference socket length, i.e. the theoretical minimum socket length used for calculation purposes.
L is the actual length of the socket from mouth to shoulder (if any).
1
L is the heated length of the fitting, i.e. the length of penetration of the heated tool into the socket.
2
L is the insertion depth, i.e. the depth of penetration of the heated pipe end into the socket.
3
NOTE L is also the depth of the “depth gauge” tool used in normal socket fusion jointing practice.
3
Figure 1 — Socket dimensions
5 Material
5.1 Technical data
The technical data referred to in Table 1 concerning the materials used shall be made available by the fitting
manufacturer.
Any change in the choice of materials affecting the quality shall require fresh type-testing of the fitting in
accordance with clause 8.
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ISO 8085-1:2001(E)
a
Table 1 — Characteristics of the PE compound
Property Units Requirement Test parameters Test method
3
Density W 930 (base polymer) 23 °C ISO 1183, ISO 1872-1
kg/m
Melt mass-flow rate g/10 min 190 °C/5 kg ISO 1133:1997
� 20 % of value declared by compound
(set of conditions T)
producer
b
Thermal stability minutes � 20 ISO/TR 10837
200 °C
Volatile-matter content mg/kg u 350 ISO 4437:1997, annex A
c
mg/kg u 300 ASTM D 4019
Water content
d
%(m/m) 2,0 % to 2,5 % ISO 6964
Carbon black content
d
grade u 3 ISO 18553
Carbon black dispersion
e
grade u 3 ISO 18553
Pigment dispersion
Resistance to gas h W 20 80 °C, 2 MPa ISO 4437:1997, annex B
constituents
Resistance to rapid crack
f
propagation (RCP):
Full-scale (FS) test: MPa The critical pressure in the FS test shall 0 °C ISO 13478
d > 250 mm be greater than or equal to the value of the
n
MOP of the system multiplied by 1,5
or
g
S4 test MPa The critical pressure in the S4 test shall be 0 °C ISO 13477
greater than or equal to the value of the MOP
of the system divided by 2,4, minus 0,72
h
(expressed in bars)
i
Resistancetoslowcrack h 165 80 °C, 8,0 bar ISO 13479
f
growth, e � 5mm
n
j
80 °C, 9,2 bar
a
Non-black compounds shall conform to the weathering requirements of ISO 4437.
b
Test may be carried out at 210 °C provided that there is a clear correlation with the results at 200 °C. In cases of dispute, the reference
temperature shall be 200 °C.
c
Only applicable if the compound does not conform to the requirement for volatile-matter content. In cases of dispute, the requirement
for water content shall apply.
d
For black compounds only.
e
Pigment dispersion method for non-black compounds only.
f
Only applicable to material in pipe form.
g
Shall be performed on pipe with a wall thicknessW 15 mm.
h
If this requirement is not met, then retesting using the full-scale (FS) test shall be performed (the calculation formula is still under study).
i
Test parameters for PE 80, SDR 11.
j
Test parameters for PE 100, SDR 11.
5.2 Compound
The compound from which the fitting is produced shall be polyethylene which shall be made by adding only those
additives necessary for the manufacture and end use of fittings conforming to this specification and for their fusion
jointing.
All additives shall be uniformly dispersed. The additives shall not have a negative influence on the performance
with respect to fusability.
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ISO 8085-1:2001(E)
5.3 Reprocessable material
Only clean reprocessable material generated from a manufacturer’s own production of fittings to this specification
may be used, and it shall be derived from the same resin as used for the relevant production.
5.4 Characteristics of the compound
The fittings shall be made of
a) virgin material,
b) reprocessable material or
c) a combination of virgin and reprocessable material.
The PE compound from which the fitting is manufactured shall conform to the requirements given in Table 1.
5.5 Classification
PE compounds shall be classified by MRS as specified in Table 2.
Table 2 — Classification of PE compounds
� (20 °C, 50 years, 97,5 %) MRS
lcl
Designation
MPa
MPa
8,00u� u 9,99
PE 80 8,0
lcl
10,00u� u 11,19
PE 100 10,0
lcl
The classification shall be established by the producer of the compound using the ISO 9080 extrapolation method
and stated in accordance with ISO 12162.
5.6 Compatibility
Conformity to clause 8 shall be established by the fitting manufacturer to ensure compatibility of the fittings with PE
pipes conforming to ISO 4437. The PE pipe compound(s) used for this demonstration, the fusion condition(s) and
the tooling shall be as detailed in the fitting manufacturer's technical file (see clause 10).
6 General requirements
6.1 Multiple connections
If a fitting includes one or more spigot ends, these shall conform to the relevant product standard.
6.2 Appearance of the fitting
When viewed without magnification, the internal and external surfaces shall be smooth, clean and free from
scoring, cavities and other surface defects which might prevent conformity to this part of ISO 8085.
© ISO 2001 – All rights reserved 7
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