SIST EN 14408-3:2005
(Main)Plastics piping systems for renovation of underground gas supply networks - Part 3: Lining with close-fit pipes
Plastics piping systems for renovation of underground gas supply networks - Part 3: Lining with close-fit pipes
This part 3 of EN 14408, in conjunction with EN 14408-1:2004 specifies requirements and test methods for close-fit lining systems intended to be used for the renovation of gas supply networks.
It covers polyethylene (PE) pipe for both independent and interactive pressure pipe liners and associated fittings and joints for the construction of the lining system. It is applicable to the plastic lining system intended to be used under the following conditions:
a) a maximum operating pressure, MOP, up to and including 10 bar 1);
b) an operating temperature of 20 °C as reference temperature.
NOTE For other operating temperatures, de-rating coefficients may be used, see EN 1555 5.
Kunststoff-Rohrleitungssysteme für die Renovierung von erdverlegten Gasversorgungsnetzen - Teil 3: Close-Fit-Lining
Dieser Teil 3 von EN 14408 legt in Verbindung mit EN 14408-1:2004 die Anforderungen an und Prüfverfahren für Close Fit Lining Systeme fest, die für den Einsatz bei der Renovierung von Gasversorgungsnetzen vorgesehen sind.
Die Norm gilt für Rohre aus Polyethylen (PE) sowohl für unabhängige als auch für interaktive Druckrohr-Liner und zugehörige Fittings und Verbindungen für den Aufbau des Lining Systems. Sie ist auf Kunststoff Liningsysteme anwendbar, die für die Verwendung unter folgenden Bedingungen vorgesehen sind:
a) ein maximal zulässiger Betriebsdruck, MOP, bis einschließlich 10 bar );
b) eine Betriebstemperatur von 20 °C als Bezugstemperatur.
ANMERKUNG Für weitere Betriebstemperaturen dürfen Leistungsminderungsfaktoren verwendet werden, siehe EN 1555 5.
Systemes de canalisations plastiques pour la rénovation des réseaux de gaz enterrés - Partie 3 : Tubage par tuyau continu sans espace annulaire
La présente partie 3 de l'EN 14408, a consulter en association avec l'EN 14408-1:2004, spécifie les exigences et les méthodes d'essai pour les systemes de tubages par tuyau continu sans espace annulaire utilisés pour la rénovation des réseaux de gaz enterrés.
Elle couvre les tubes en polyéthylene (PE) a la fois pour les tubages autostructurants et les tubages nécessitant le maintien de l'enveloppe ainsi que les raccords associés et les assemblages pour la construction du systeme de rénovation. Elle est applicable au systeme de rénovation en plastique destiné a etre utilisé dans les conditions suivantes :
a) une pression maximale de service, MOP, jusqu'a 10 bars ) inclus ;
b) une température de fonctionnement de 20 °C comme température de référence.
NOTE Pour d'autres températures de fonctionnement, il est possible d'utiliser des facteurs de réduction, voir le EN 1555 5.
Cevni sistemi iz polimernih materialov za obnovo podzemnih omrežij za oskrbo s plinom - 3. del: Oblaganje s tesno prilagodljivimi cevmi
General Information
Relations
Standards Content (Sample)
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
SIST EN 14408-3:2005
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
EN 14408-3:2004 (E) 2 Contents page Foreword.3 1 Scope.5 2 Normative references.5 3 Terms, definitions, symbols and abbreviations.6 4 Pipes at the “M” stage.9 5 Fittings at the “M” stage.10 6 Valves.11 7 Fitness for purpose of the lining system at the “I” stage.11 8 Installation practice.12 Annex A (informative)
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
SIST EN 14408-3:2005
EN 14408-3:2004 (E) 3 Foreword
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.
SIST EN 14408-3:2005
EN 14408-3:2004 (E) 4
Figure 1 Format of the renovation system standards SIST EN 14408-3:2005
EN 14408-3:2004 (E) 5 1 Scope This part 3 of EN 14408, in conjunction with EN 14408-1:2004 specifies requirements and test methods for close-fit lining systems intended to be used for the renovation of gas supply networks. It covers polyethylene (PE) pipe for both independent and interactive pressure pipe liners and associated fittings and joints for the construction of the lining system. It is applicable to the plastic lining system intended to be used under the following conditions: a) a maximum operating pressure, MOP, up to and including 10 bar 1); b) an operating temperature of 20 °C as reference temperature. NOTE For other operating temperatures, de-rating coefficients may be used, see EN 1555-5. 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. EN 1555-1:2002, Plastics piping systems for gaseous fuel supply — Polyethylene (PE) — Part 1: General EN 1555-2:2002, Plastics piping systems for gaseous fuel supply — Polyethylene (PE) — Part 2: Pipes EN 1555-3:2002, Plastics piping systems for gaseous fuel supply — Polyethylene (PE) — Part 3: Fittings EN 1555-4, Plastics piping systems for gaseous fuel supply — Polyethylene (PE) — Part 4: Valves
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
EN 14408-3:2004 (E) 6
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
EN 14408-3:2004 (E) 7 3.3.7 maximum wall thickness (at any point)
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
EN 14408-3:2004 (E) 8 3.6 Definitions related to service conditions 3.6.1 gaseous fuel any fuel which is in gaseous state at a temperature of 15 °C, at the atmospheric pressure 3.6.2 maximum operating pressure (MOP) maximum effective pressure of the fluid in the piping system, expressed in bar, which is allowed in continuous use.
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
EN 14408-3:2004 (E) 9 t :
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
EN 14408-3:2004 (E) 10 NOTE In the case of factory folded pipes variations in wall thickness in one cross-section can be present. This is acceptable as long as the folded pipe has the property to obtain a wall thickness in accordance with 7.4 during/after the reversion process. See 7.4. 4.5 Mechanical characteristics 4.5.1 Conditioning Unless otherwise specified by the applicable test method, the test pieces shall be conditioned at (23 ± 2) °C, before testing in accordance with Table 1. 4.5.2 Requirements When tested in accordance with the method given in Table 1, the pipe shall conform to the requirements in the table. Table 1 — Mechanical characteristics of pipes Test parameters Test method Characteristic Requirement Parameters Value
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
EN 14408-3:2004 (E) 11 6 Valves Valves shall conform to EN 1555-4.
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.
SIST EN 14408-3:2005
EN 14408-3:2004 (E) 12 7.5 Mechanical characteristics When tested in accordance with the test methods given in Table 3, pipes, taken from actual or simulated installations in accordance with 7.8, shall have mechanical characteristics conforming to Table 3. Table 3 — Mechanical characteristics of pipes Test parameters a, b Characteristics Requirement Parameters Value Test method Hydrostatic strength (20°C, 100 h) Hydrostatic strength (80°C, 1000 h) Resistance to rapid crack propagation Resistance to slow crack growth Shall conform to EN 1555-2:2002 a Where the test parameters cannot be met with a particular technique (e.g. limited product range, not including SDR11), the test parameters shall be re-calculated accordingly b Where electro fusion saddles are offered as part of the lining system, the long term integrity of the saddle/reverted pipe-assembly shall be demonstrated in accordance with EN 1555-5
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 characteristics of the installed pipe. 7.8 Sampling Sampling of the installed pipe shall conform to 7.8 of EN 14408-1:2004. NOTE For process verification testing, samples can conveniently be taken either from the exposed end of an installed liner where this emerges from the host pipe, or from a section of the liner installed in a length of simulated host pipe; see 8.4.3 of EN 14408-1:2004 8 Installation practice 8.1 Preparatory work Preparatory work shall conform to 8.1 of EN 14408-1:2004. 8.2 Storage, handling and transport Precautions shall be taken to ensure that no excessive damage is caused to the lining pipe during unloading, site handling and storage. In this context excessive damage shall mean any scratch which is more than 10 % of the wall thickness in depth, or the imposition of any severe bending operation which results in a permanent kink, crease or fold. NOTE
The lining pipe should be stored on reasonably level ground, free of large sharp stones, debris or litter, to avoid potentially damaging
point-loading. SIST EN 14408-3:2005
EN 14408-3:2004 (E) 13 In general and in the absence of any specific handling requirements, these precautions shall include the use of webbing slings in place of wire rope or chains, and the use of spreader beams for pipe lengths in excess of 12 m. Where the system designer specifies handling requirements, these shall prevail. The lining pipe shall be transported on a flat bed vehicle free from nails or other projections or on a purpose-built trailer designed to carry the lining pipe as a freestanding coil or wound on to a drum. Before being loaded onto a trailer, the lining pipe shall be visually checked for any damage. Pipes which do not meet the above stated specifications shall be rejected, clearly marked and removed to a separate stock. 8.3 Equipment 8.3.1 Butt-fusion and debeading equipment Butt fusion equipment shall conform to ISO 12176-1 and shall be capable of producing joints under site conditions, and in addition to the heater plate shall include such clamping, re-rounding and trimming facilities as will ensure alignment and matching of the pipe ends, and an external debeader able to remove the bead cleanly in one continuous strip without damage to the pipe, in accordance with the installation manual.
NOTE A shelter should be provided to avoid weld contamination from water and dust, and to generally maintain a clean and warm working environment. The lining pipe string should be plugged to prevent cold air blowing through which could otherwise adversely affect the weld. 8.3.2 Reduction equipment Depending on the lining technique, a reduction of the lining pipe may take place at the site. The reduction equipment shall be operated in accordance with the technique’s specification. Reduction or deformation equipment for use on site shall be free from sharp edges that could damage the pipe during deformation. Any lubricant used in the reduction process shall have no adverse effects on the lining material. 8.3.3 Pipe skids / rollers Depending on the technique, pipe skids or rollers shall be used. These shall minimise frictional loads and prevent damage to the pipe as it is moved during the butt-fusion and installation processes. 8.3.4 Winching equipment The winch equipment shall have a means of recording, graphically or numerically, the load applied to the winch cable during installation. NOTE 1 All winching operations are potentially dangerous and any exposed winch cable should be guarded. It is necessary in respect of winching equipment and operations to take account of all applicable national health and safety regulations. NOTE 2 Winching equipment normally consists of a powered winch connected to the lining pipe by a winch cable and appropriate nose cone connection. The force in the winch cable should be measured directly, and not inferred from the hydraulic pressure on the drive motors or by other such indirect means. 8.3.5 Pipe entry guides Guides should be used at the ends of the host pipe to prevent damage to the lining pipe during insertion. 8.3.6 Reforming equipment Any equipment used to carry out the reforming or rerounding process shall be capable of providing the required conditions of pressure and temperature and shall be in accordance with the technique’s specification. SIST EN 14408-3:2005
EN 14408-3:2004 (E) 14 8.3.7 Electrofusion equipment Electrofusion equipment shall conform to ISO 12176-2. The power supplier/controller and associated alignment and fixing clamps shall be such as to ensure fusion when following the manufacturer's guidelines for surface preparation and fusion. 8.4 Installation Installation shall follow the procedures detailed in the installation manual. The installation manual shall specify all necessary parameters and details of the method of reforming the lining pipe to achieve a closefit. Where applicable, the description of the reforming method and the installation parameters shall specify, according to the requirements of the technique concerned: a)
maximum and/or minimum values of any internal pressure to be applied; b)
maximum and/or minimum values of temperatures to be reached on the inside and/or outside surfaces of the pipe; c)
maximum pulling forces; d)
minimum installed bending radii; e)
permitted ambient temperature range. The manual shall also include details of the type of fittings to be used and any special requirements for these. Where pipes are jointed to form one string on site using butt-fusion, the method of external debeading shall be specified. The method statement shall detail at least:
how the bead is removed;
how the bead and the related joint are identified;
how the bead should be examined for quality control purposes, and stored for future reference. Where squeeze-off is used during the installation process, the squeezed-off section shall, if instructed by the client, be removed before the liner is put into service. Otherwise, the squeezed-off section shall be re-rounded and marked to prevent repeat squeezing of the same section. For pipes expanded to fit an electrofusion coupler, a stiff internal supporting sleeve shall be installed to maintain melt pressure during fusion. The supporting sleeve shall have a design and dimensions that have been proved to give satisfactory joints, in accordance with EN 1555-3:2002, with the make and type of electrofusion couplers to be used. Note : Where possible, prior to lining, sections of the existing pipeline should be removed as necessary to accommodate external fittings to the lining system, e.g. couplers, saddles, branches. 8.5 Process related inspection and testing If required by the client, the finished liner shall be inspected internally to verify that it is continuous over the entire length of the installation. Inspection shall be made at the leading end, and where possible at other places along the installed lengths when the pipe is exposed (e.g. service connections windows), to verify that the e
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