EN 14408-3:2004

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Cevni sistemi iz polimernih materialov za obnovo podzemnih omrežij za oskrbo s plinom - 3. del: Oblaganje s tesno prilagodljivimi cevmiKunststoff-Rohrleitungssysteme für die Renovierung von erdverlegten Gasversorgungsnetzen - Teil 3: Close-Fit-LiningSystemes de canalisations plastiques pour la rénovation des réseaux de gaz enterrés - Partie 3 : Tubage par tuyau continu sans espace annulairePlastics piping systems for renovation of underground gas supply networks - Part 3: Lining with close-fit pipes91.140.40Sistemi za oskrbo s plinomGas supply systems83.140.30Cevi, fitingi in ventili iz polimernih materialovPlastics pipes, fittings and valvesICS:Ta slovenski standard je istoveten z:EN 14408-3:2004SIST EN 14408-3:2005en,fr,de01-januar-2005SIST EN 14408-3:2005SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 14408-3September 2004ICS 23.040.20; 23.040.45English versionPlastics piping systems for renovation of underground gassupply networks - Part 3: Lining with close-fit pipesSystèmes de canalisations plastiques pour la rénovationdes réseaux de gaz enterrés - Partie 3 : Tubage par tuyaucontinu sans espace annulaireKunststoff-Rohrleitungssysteme für die Renovierung vonerdverlegten Gasversorgungsnetzen - Teil 3: Close-Fit-LiningThis European Standard was approved by CEN on 29 July 2004.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2004 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 14408-3:2004: ESIST EN 14408-3:2005

Guidance for assessment of conformity.15 Annex B (normative)
Factory folded polyethylene (PE) pipe –
Test method for the determination of memory ability.19 Annex C (informative)
Folded polyethylene (PE) pipe — Determination of resistance to circumferential tensile stress at constant temperature.21 Bibliography.25
This document (EN 14408-3:2004) has been prepared by Technical Committee CEN/TC 155, "Plastics piping systems and ducting systems", the secretariat of which is held by NEN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by March 2005, and conflicting national standards shall be withdrawn at the latest by March 2005. System standards dealing with the following applications are either available or in preparation:
Plastics piping systems for renovation of underground non-pressure drainage and sewerage networks;
Plastics piping systems for renovation of underground gas supply networks [this application];
Plastics piping systems for renovation of underground water supply networks;
Plastics Piping Systems for Renovation of underground pressure drainage and sewerage networks;
Plastics piping systems for renovation of industrial pipe systems. These system standards are distinguished from system standards for conventionally installed plastics piping systems by the requirement to verify certain characteristics in the as-installed condition, after site processing. This is in addition to verification of characteristics of plastics piping systems as manufactured. These system standards are complemented by the information contained in ISO/TR 11295 [5] and EN 13689 [2] (listed in the bibliography). The system standard EN 14408 comprises four parts, as follows:
Part 1: General
Part 21): Lining with continuous pipes
Part 3: Lining with close-fit pipes (this document)
Part 41): Lining with cured-in-place pipes The requirements for any given renovation technique family are covered by Part 1: General, and are for use in conjunction with the relevant other part. For example, for the requirements relating to "Lining with close-fit pipes", it is necessary to refer to both parts 1 and 3. A consistent structure of clause headings has been adopted for all parts to facilitate direct comparisons across renovation technique families. Figure 1 shows the common part and clause structure and the relationship between EN 14408 and the system standards for other applications. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard : Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
1) At the date of publication of this document, the standardization work on prEN 14408-2 and prEN 14408-4 has not started.
Figure 1  Format of the renovation system standards SIST EN 14408-3:2005

EN 1555-5, Plastics piping systems for gaseous fuel supply — Polyethylene (PE) — Part 5: Fitness for purpose of the system EN 14408-1:2004, Plastics systems for renovation of underground gas supply networks — Part 1: General EN ISO 899-1:2003, Plastics — Determination of creep behaviour — Part 1: Tensile creep (ISO 899-1:2003) prEN ISO 3126, Plastics piping systems — Plastics components — Determination of dimensions (ISO FDIS 3126:2002) ISO 12176-1, Plastics pipes and fittings — Equipment for fusion jointing polyethylene systems — Part 1: Butt fusion ISO 12176-2, Plastics pipes and fittings — Equipment for fusion jointing polyethylene systems — Part 2: Electro fusion
1) 1 bar = 0,1 MPa SIST EN 14408-3:2005

3 Terms, definitions, symbols and abbreviations For the purposes of this document, the terms, definitions, symbols and abbreviations given in EN 14408-1:2004 and the following apply. 3.1 General terms and definitions 3.1.1 close fit situation of the outside of the installed liner relative to the inside of the existing pipeline, which may either be an interference fit or include a small annular gap resulting from shrinkage and tolerances only 3.1.2 close-fit pipe continuous lining pipe of thermoplastic material reshaped or otherwise expanded after insertion to achieve a close fit to the existing pipeline 3.2 Terms and definitions related to techniques No definitions apply. 3.3 Geometrical definitions 3.3.1 outside diameter (at any point)
de value of the measurement of the outside diameter through its cross-section at any point of the pipe, rounded to the next greater 0,1 mm 3.3.2 minimum mean outside diameter
dem,min minimum value for the mean outside diameter as specified for a given nominal size 3.3.3 maximum mean outside diameter
dem,max maximum value for the mean outside diameter as specified for a given nominal size 3.3.4 out-of-roundness (ovality) difference between the maximum and the minimum outside diameter in the same cross-section of a pipe or spigot 3.3.5 nominal wall thickness
en numerical designation of the wall thickness of a component, which is a convenient round number, approximately equal to the manufacturing dimension in millimetres (mm) NOTE For thermoplastics components conforming to EN 1555, the value of the nominal wall thickness, en, is identical to the specified minimum wall thickness at any point, emin. 3.3.6 minimum wall thickness (at any point)
emin minimum value for the wall thickness around the circumference of a component, as specified SIST EN 14408-3:2005

em,max maximum value for the mean wall thicknessaround the circumference of a component, as specified 3.3.8 tolerance permitted variation of the specified value of a quantity, expressed as the difference between the permitted maximum and the permitted minimum value 3.4
Material definitions 3.4.1 compound homogenous mixture of base polymer (PE) and additives, i.e. anti-oxidants, pigments, UV-stabilisers and others, at a dosage level necessary for the processing and use of components conforming to the requirements of this document 3.5 Definitions related to material characteristics 3.5.1 lower confidence limit of the predicted hydrostatic strength
σLPL quantity, expressed in megapascals (MPa), which can be considered as a material property, representing the 97,5 % lower confidence limit of the predicted long-term hydrostatic strength for water at 20 °C for 50 years 3.5.2 minimum required strength (MRS) value of LPL, rounded to the next lower value of the R10-series when the LPL is below 10 MPa, or to the next lower value of the R20-series when the LPL is 10 MPa or greater NOTE R10- and R20-series are the Renard number series conforming to ISO 3[3] and ISO 497[4].
3.5.3 overall service (design) coefficient or safety factor
C coefficient with a value greater than one, which takes into consideration service conditions as well as properties of the components of a piping system other than those represented in the LPL NOTE The minimum overall design coefficient for gas is 2,0. 3.5.4 design stress
σs allowable stress, in megapascals, for a given application.
It is derived from the MRS by dividing it by the coefficient C, i.e.: =C[MRS]Sσ 3.5.5 melt-mass flow rate (MFR) value relating to the viscosity of the molten material at a specified temperature and rate of shear, expressed in grams per 10 min (g/10 min) SIST EN 14408-3:2005

It takes into account the physical and the mechanical characteristics of the components of a piping system
NOTE It is calculated using the following equation: 1)-([SDR][MRS] 20 P][××=C 3.7 Definitions related to joints 3.7.1 electrofusion joint joint between a PE electrofusion socket or saddle fitting and a pipe or a spigot end fitting. The electrofusion fittings are heated by the Joule effect of the heating element incorporated at their jointing surfaces, causing the material adjacent to them to melt and the pipe and fitting surfaces to fuse 3.7.2 butt fusion joint (using heated tool) joint made by heating the planed ends the surfaces of which match by holding them against a flat heating plate until the PE material reaches fusion temperature, removing the heating plate quickly and pushing the two softened ends against one another 3.7.3 mechanical joint joint made by assembling a PE pipe with a fitting that generally includes a compression part to provide for pressure integrity, leaktightness and resistance to end loads.
3.7.4 fusion compatibility ability of two similar or dissimilar polyethylene materials to be fused together to form a joint which conforms to the performance requirements of this document 3.8 Definitions related to assessment of conformity No definitions apply 3.9 Symbols and abbreviations 3.9.1 Symbols C :
overall service (design) coefficient de :
outside diameter (at any point) dem :
mean outside diameter dem,max :
maximum mean outside diameter dem,min :
minimum mean outside diameter dmanuf :
the original circular diameter of the pipe (before folding) em,max :
maximum mean wall thickness
T :
temperature at which stress rupture data have been determined SIST EN 14408-3:2005

time for leak to occur in the test piece ty :
wall thickness tolerance σs :
design stress 3.10 Abbreviations DN :
nominal size DN/OD :
nominal size, outside diameter related LPL :
lower confidence limit of the predicted hydrostatic strength MFR :
melt mass-flow rate MOP :
maximum operating pressure MRS :
minimum required strength PE :
polyethylene R :
series of preferred numbers, conforming to the Renard series 4 Pipes at the “M” stage 4.1 Materials 4.1.1 Virgin material The compound shall conform to EN 1555-1:2002. 4.1.2 Reprocessable material and recyclable material Own reprocessable material may be used, provided that it is derived from the same compound, as used for the relevant production.
External reprocessable material shall not be used.
Recyclable material shall not be used. 4.2 General characteristics 4.2.1 Appearance When viewed without magnification, the internal and external surfaces of the pipe shall be smooth, clean and free from scoring, cavities and other defects which would prevent conformity to this document. 4.2.2 Colour The pipes shall be yellow or orange, black or black with yellow identification stripes 4.3 Material characteristics The material from which the pipes are made shall conform to the requirements as specified in Table 1 of EN 1555-1:2002. 4.4 Geometric characteristics The pipe diameter, wall thickness and shape in the "M" stage depend on the specific close-fit lining technique. "M" stage dimensions needed to obtain "I" stage dimensions
(see 7.4), shall be declared, with their tolerances, by the manufacturer. SIST EN 14408-3:2005

Elongation at break Hydrostatic strength (80°C, 165 h) a
Shall conform to EN 1555-2 a The pipe shall be reverted in the case of factory-folded pipes
4.6 Physical characteristics Physical characteristics shall conform to those specified in EN 1555-2:2002. In the case of factory-folded heat-reverted pipes, the pipe shall additionally conform to the requirement for memory ability specified in Annex B. 4.7 Jointing Butt fusion joints shall conform to EN 1555-2:2002 and EN 1555-5. Butt fusion joints shall not be made between folded pipes prior to reversion. NOTE The joining of circular pipes to form a string prior to site processing is considered as part of the “M”-stage. 4.8 Marking Pipes shall be marked in accordance with 4.8 of EN 14408-1:2004. NOTE In addition the PE pipe can be marked with the following optional information:
MFR 5 Fittings at the “M” stage Fittings shall conform to EN 1555-3:2002. NOTE 1 It is possible that some fittings conforming to EN 1555-3:2002 are not compatible with the dimensions and tolerances detailed in Table 2. NOTE 2
Interactive pressure pipe liners can rely on the use of technique-dependent, mechanical fittings for end connections and service connections. The mechanical fittings provide the connection between the liner, which is generally thin walled, and the rest of the pipeline system, by clamping the liner wall inside/outside. By means of a movable compression part, the fitting provides pressure integrity, leaktightness and resistance to end loads. The fitting generally includes a support sleeve either inserted into or assembled around the liner and can include also a grip ring. The mechanical fitting can be supplied for field assembly. SIST EN 14408-3:2005

7 Fitness for purpose of the lining system at the “I” stage 7.1 Materials Any combination of pipes, fittings and valves conforming to Clauses 4, 5 and 6 respectively, may be used, provided that, where applicable, fusion compatibility has been demonstrated in accordance with Clause 4 of EN 1555-5. 7.2 General characteristics The internal surface of the pipe shall be smooth, free from scoring and other defects that could impair the functionality. NOTE A feature of close fit pipe is that the lining may conform to the surface characteristics of the existing pipe. 7.3 Material characteristics There are no additional requirements for material characteristics. 7.4 Geometric characteristics Samples of pipes taken from actual or simulated installations, shall have wall thicknesses conforming to the requirements of Table 2, whereby relevant dimensions shall be measured according to EN ISO 3126 at a temperature of (23 ± 2) °C. Table 2 —Ppipe wall thicknesses after installation Dimensions in millimetres Standard dimension ratio a SDR 11 SDR 17 SDR 17,6 SDR 26 Wall thickness b
Maximum mean outside diametera dem,max
emin em,max emin em,max emin em,max emin em,max 100 125 150 200 225 250 300 350 400 500 600
9,1
11,4
13,7
18,2
20,5
22,7
27,3
31,9 — — — 10,7 13,3 15,9 20,9 23,5 26,0 31,1 36,3 — — —
5,9
7,4
8,9
11,9
13,4
14,8
17,7
20,6
23,7
29,7 —
7,1
8,8 10,5 13,9 15,6 17,1 20,4 23,6 27,1 33,5 —
5,7
7,1
8,6
11,4
12,8
14,2
17,1
19,9
22,8
28,3 —
6,9
8,5 10,2 13,3 14,9 16,4 19,7 22,8 26,1 32,2 —
3,9
4,8
5,8
7,7
8,6
9,6
11,6
13,5
15,3
19,1
23,1
4,9
5,9
7,0
9,2
10,2
11,3
13,5
17,7
15,4
21,9
26,4 a Outside diameters and SDRs are examples, other
sizes and SDRs are acceptable. b Wall thickness requirements calculated as, both rounded up to the next 0,1 mm:
emin
= dem,max / SDR;
em,max = 1,12emin + 0,5 mm.
Joints shall conform to EN 1555-5. 7.6 Physical characteristics There are no requirements for physical characteristics of the installed pipe. 7.7 Additional characteristics There are no requirements for additional characteris
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