ISO 6993-3:2006
(Main)Buried, high-impact poly(vinyl chloride) (PVC-HI) piping systems for the supply of gaseous fuels — Part 3: Fittings and saddles for a maximum operating pressure of 1 bar (100 kPa)
Buried, high-impact poly(vinyl chloride) (PVC-HI) piping systems for the supply of gaseous fuels — Part 3: Fittings and saddles for a maximum operating pressure of 1 bar (100 kPa)
ISO 6993-3:2006 gives the requirements for full-end load-resistant fittings and saddles made of high-impact poly(vinyl chloride) (PVC-HI) intended to be used for the supply of gaseous fuels through buried pipelines having an operating temperature range of 0 degrees Celsius up to and including +30 degrees Celsius and a maximum operating pressure of 1 bar (100 kPa). It is applicable only to fittings and saddles manufactured from the high-impact PVC materials PVC-A, PVC-CPE and PVC-EPR. It is applicable to joints with elastomeric sealing elements and of the solvent cement type. The fittings and saddles are suitable for those gases not containing potentially damaging components in such concentrations as to impair the properties of the fitting/saddle material.
Systèmes de canalisations enterrées en poly(chlorure de vinyle) à résistance au choc améliorée (PVC-HI) pour réseaux de combustibles gazeux — Partie 3: Raccords et colliers pour une pression maximale de service de 1 bar (100 kPa)
General Information
Relations
Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 6993-3
First edition
2006-06-01
Buried, high-impact poly(vinyl chloride)
(PVC-HI) piping systems for the supply of
gaseous fuels —
Part 3:
Fittings and saddles for a maximum
operating pressure of 1 bar (100 kPa)
Systèmes de canalisations enterrées en poly(chlorure de vinyle) à
résistance au choc améliorée (PVC-HI) pour réseaux de combustibles
gazeux —
Partie 3: Raccords et colliers pour une pression maximale de service de
1 bar (100 kPa)
Reference number
©
ISO 2006
PDF disclaimer
This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but
shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In
downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat
accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.
Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation
parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In
the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.
© ISO 2006
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or
ISO's member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2006 – All rights reserved
Contents Page
Foreword. iv
1 Scope . 1
2 Normative references . 1
3 Terms, definitions, symbols and abbreviated terms. 2
4 Material . 5
5 General characteristics of fittings/saddles . 6
6 Geometrical characteristics. 6
7 Physical characteristics. 7
8 Mechanical characteristics . 8
9 Saddle design and construction . 9
10 Performance requirements . 10
11 Test methods. 11
12 Marking . 11
Annex A (normative) Determination of resistance to external blows at 0 °C for fittings. 13
Annex B (normative) Determination of resistance to external blows at 0 °C for saddles . 15
Annex C (normative) Determination of tensile resistance of in-line fitting assemblies . 18
Annex D (normative) Determination of leaktightness of saddle joints by internal air pressure,
with and without mechanical loading. 19
Annex E (normative) Determination of leaktightness of saddle joints under negative pressure and
mechanical loading. 21
Annex F (normative) Determination of leaktightness under constant load and by tensile testing at
constant speed of lateral connections (end-load resistant joints of tapping saddles with
PE service pipe lines). 23
Bibliography . 25
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 6993-3 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 first edition of ISO 6993-3, together with ISO 6993-1, ISO 6993-2 and ISO 6993-4, cancels and replaces
ISO 6993:2001, of which it constitutes a technical revision.
ISO 6993 consists of the following parts, under the general title Buried, high-impact poly(vinyl chloride)
(PVC-HI) piping systems for the supply of gaseous fuels:
⎯ Part 1: Pipes for a maximum operating pressure of 1 bar (100 kPa)
⎯ Part 2: Fittings for a maximum operating pressure of 200 mbar (20 kPa)
⎯ Part 3: Fittings and saddles for a maximum operating pressure of 1 bar (100 kPa)
⎯ Part 4: Code of practice for design, handling and installation
iv © ISO 2006 – All rights reserved
INTERNATIONAL STANDARD ISO 6993-3:2006(E)
Buried, high-impact poly(vinyl chloride) (PVC-HI) piping
systems for the supply of gaseous fuels —
Part 3:
Fittings and saddles for a maximum operating pressure of 1 bar
(100 kPa)
1 Scope
This part of ISO 6993 gives the requirements for full-end load-resistant fittings and saddles made of
high-impact poly(vinyl chloride) (PVC-HI) intended to be used for the supply of gaseous fuels through buried
pipelines having an operating temperature range of 0 °C up to and including +30 °C and a maximum operating
1)
pressure of 1 bar (100 kPa) .
It is applicable only to fittings and saddles manufactured from the high-impact PVC materials PVC-A,
PVC-CPE and PVC-EPR. It is applicable to joints with elastomeric sealing elements and of the solvent cement
type. The fittings and saddles are suitable for those gases not containing potentially damaging components in
such concentrations as to impair the properties of the fitting/saddle material.
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 580:2005, Plastics piping and ducting systems — Injection-moulded thermoplastics fittings — Methods for
visually assessing the effects of heating
ISO 2507-1, Thermoplastics pipes and fittings — Vicat softening temperature — Part 1: General test method
ISO 2507-2, Thermoplastics pipes and fittings — Vicat softening temperature — Part 2: Test conditions for
unplasticized poly(vinyl chloride) (PVC-U) or chlorinated poly(vinyl chloride) (PVC-C) pipes and fittings and for
high impact resistance poly(vinyl chloride) (PVC-HI) pipes
ISO 3126, Plastics piping systems — Plastics components — Determination of dimensions
ISO 3127, Thermoplastics pipes — Determination of resistance to external blows — Round-the-clock method
ISO 4422-3:1996, Pipes and fittings made of unplasticized poly(vinyl chloride) (PVC-U) for water supply —
Specifications — Part 3: Fittings and joints
ISO 6993-1:2006, Buried, high-impact poly(vinyl chloride) (PVC-HI) piping systems for the supply of gaseous
fuels — Part 1: Pipes for a maximum operating pressure of 1 bar (100 kPa)
5 2
1) 1 bar = 0,1 MPa = 10 Pa; 1 MPa = 1 N/mm
ISO 9080, Plastics piping and ducting systems — Determination of the long-term hydrostatic strength of
thermoplastics materials in pipe form by extrapolation
EN 682:2002, Elastomeric seals — Material requirements for seals used in pipes and fittings carrying gas and
hydrocarbon fluids
EN 922:1994, Plastics piping and ducting systems — Pipes and fittings of unplasticized poly(vinyl chloride)
(PVC-U) — Specimen preparation for determination of the viscosity number and calculation of the K-value
3 Terms, definitions, symbols and abbreviated terms
For the purposes of this document, the terms, definitions, symbols and abbreviated terms given in ISO 6993-1
and the following terms, definitions and symbols apply.
3.1 Terms and definitions
3.1.1
fitting
component, other than a pipe, used in a pipeline
EXAMPLE Bend, tee, coupler, end cap.
3.1.2
joint
connection between the ends of two components (with smooth spigot-ends and/or sockets)
NOTE In this part of ISO 6993, only solvent weld joints are considered.
3.1.3
socket
end of the fitting into which a smooth spigot-end can be inserted and joined by the solvent weld process
3.1.4
tapping saddle
component, including the necessary parts such as wedges and connector, used to make branches from a
main pipeline to a service pipeline of polyethylene (PE) with a maximum d of 63
n
See Figure 1.
2 © ISO 2006 – All rights reserved
Key
1 cap 5 wedge
2 end trust joint 6 lower saddle half
3 upper saddle half 7 tapping tee
4 clamp
Figure 1 — Tapping saddle
3.1.5
bag stopper saddle
component, including the necessary parts such as wedges and balloon entry equipment, used to introduce a
balloon into a pipeline in order to temporarily interrupt the gas flow
See Figure 2.
Figure 2 — Bag stopper saddle
3.2 Symbols
d depth/total depth of cracks, delaminations, blisters, or open yield seam, as applicable
L crack/blister length
l key-way length
4 © ISO 2006 – All rights reserved
4 Material
4.1 Material for fittings/saddles
4.1.1 Composition
The fittings and saddles shall be made of high-impact PVC, to which only such additives are added that are
necessary to facilitate conformity of the components to this part of ISO 6993.
The impact-resistant modified PVC shall be one of the following compositions:
a) a mixture based on PVC;
b) a blend based on PVC;
c) a copolymer based on PVC;
d) a combination of these types.
The proportion of the impact modifier in the composition shall be at least 7 % by mass.
4.1.2 Long-term strength
The MRS value of the injection-moulding material shall be at least 14 MPa. Conformity to this requirement
shall be proven using a long-term evaluation in accordance with ISO 9080. Testing is to be carried out at
20 °C, 40 °C and 60 °C, for periods up to 10 000 h. At 60 °C no knee shall occur before 5 000 h.
For injection-moulding compounds, this test shall be carried out on test pieces in the form of an injection
moulded or extruded sample in solid wall pipe form made from the relevant injection-moulding material.
NOTE The MRS evaluation is used for a material qualification and is not intended to be used for a pressure rating.
4.1.3 Vicat softening temperature
The Vicat softening temperature of the injection-moulding material shall be not less than 74 °C when
determined in accordance with ISO 2507-1 and ISO 2507-2.
4.1.4 K-value
The K-value of the unplasticized polyvinyl chloride (PVC-U) resin in the injection-moulding material shall
exceed 57, when measured in accordance with EN 922.
4.2 Material for elastomeric sealing elements
The material of the elastomeric sealing elements shall conform to EN 682:2002, type G.
The elastomeric sealing element shall have no detrimental effects on the properties of the components.
5 General characteristics of fittings/saddles
5.1 Contaminants
The material of the fitting or saddle shall not be shown to contain any contaminants, such as inorganic
particles or agglomerations thereof, exceeding 50 µm in size, when measured in accordance with 11.1
and 11.2.
5.2 Appearance and finish
The appearance and finish of the fitting/saddle shall be examined visually without magnification.
Internal and external surfaces shall be free from grooves, pits, blisters, indications of
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.