en 15655 2009 polyurethen lining

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Pagina IUNI EN 15655:2009

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UNI EN 15655

APRILE 2009

Tubi, raccordi e accessori di ghisa sferoidaleRivestimento interno in poliuretano per tubi e raccordiRequisiti e metodi di prova

Ductile iron pipes, fittings and accessoriesInternal polyurethane lining for pipes and fittingsRequirements and test methods

La norma specifica i requisiti e i metodi di prova per il rivestimentointerno in poliuretano applicato in fabbrica quale protezione rinfor-zata alla corrosione per tubazioni e raccordi in ghisa sferoidaleinterrati conformi alle norme UNI EN 545, UNI EN 598, UNI EN 969per utilizzo a temperature di esercizio permanenti fino a 45°C.

TESTO INGLESE

La presente norma è la versione ufficiale in lingua inglese dellanorma europea EN 15655 (edizione gennaio 2009) e tiene contodelle correzioni introdotte il 4 febbraio 2009.

ICS 23.040.10; 23.040.40

BUREAU VERITAS ITALIA SPA - servizio UNICoNTO - abbonamento n. 9324 scadenza: 13/2/2014 - Documento scaricato il 15/11/2011

© UNI Pagina IIUNI EN 15655:2009

Le norme UNI sono elaborate cercando di tenere conto dei punti di vista di tutte le partiinteressate e di conciliare ogni aspetto conflittuale, per rappresentare il reale statodell’arte della materia ed il necessario grado di consenso.Chiunque ritenesse, a seguito dell’applicazione di questa norma, di poter fornire sug-gerimenti per un suo miglioramento o per un suo adeguamento ad uno stato dell’artein evoluzione è pregato di inviare i propri contributi all’UNI, Ente Nazionale Italiano diUnificazione, che li terrà in considerazione per l’eventuale revisione della norma stessa.

Le norme UNI sono revisionate, quando necessario, con la pubblicazione di nuove edizioni odi aggiornamenti. È importante pertanto che gli utilizzatori delle stesse si accertino di essere in possessodell’ultima edizione e degli eventuali aggiornamenti. Si invitano inoltre gli utilizzatori a verificare l’esistenza di norme UNI corrispondenti allenorme EN o ISO ove citate nei riferimenti normativi.

PREMESSA NAZIONALELa presente norma costituisce il recepimento, in lingua inglese, del-la norma europea EN 15655 (edizione gennaio 2009 con correzionidel 4 febbraio 2009), che assume così lo status di norma nazionaleitaliana.

La presente norma è stata elaborata sotto la competenza dell’entefederato all’UNIUNSIDER - Ente Italiano di Unificazione Siderurgica

La presente norma è stata ratificata dal Presidente dell’UNI ed èentrata a far parte del corpo normativo nazionale il 23 aprile 2009.


EUROPEAN STANDARD

NORME EUROPÉENNE

EUROPÄISCHE NORM

EN 15655

January 2009

ICS 23.040.10; 23.040.40

English Version

Ductile iron pipes, fittings and accessories - Internalpolyurethane lining for pipes and fittings - Requirements and test

methods

Tuyaux, raccords et accessoires en fonte ductile -Revêtement intérieur en polyuréthane des tuyaux et

raccords - Prescriptions et méthodes d'essais

Rohre, Formstücke und Zubehörteile aus duktilemGusseisen - Polyurethan-Auskleidung von Rohren und

Formstücken - Anforderungen und Prüfverfahren

This European Standard was approved by CEN on 22 November 2008.

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 CEN Management Centre 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 CEN Management Centre has the same status as theofficial versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATIONC O M I T É E U R O P É E N D E N O R M A LI S A T I O NEUR OP ÄIS C HES KOM ITEE FÜR NOR M UNG

Management Centre: rue de Stassart, 36 B-1050 Brussels

© 2009 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.

Ref. No. EN 15655:2009: E

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Contents Page

Foreword ..............................................................................................................................................................3 Introduction .........................................................................................................................................................4 1 Scope ......................................................................................................................................................5 2 Normative references ............................................................................................................................5 3 Terms and definitions ...........................................................................................................................5 4 Ordering information .............................................................................................................................7 5 Technical Requirements .......................................................................................................................7 5.1 Surface preparation ...............................................................................................................................7 5.2 Finished polyurethane lining ................................................................................................................7 5.3 Pipe ends ................................................................................................................................................8 5.4 Repairs ....................................................................................................................................................8 5.5 Marking ...................................................................................................................................................8 5.6 Non porosity ...........................................................................................................................................9 5.7 Hardness .................................................................................................................................................9 5.8 Adhesion .................................................................................................................................................9 6 Performance Requirements ..................................................................................................................9 6.1 Chemical resistance ..............................................................................................................................9 6.2 Indirect Impact strength ........................................................................................................................9 6.3 Resistance to ovalization ......................................................................................................................9 6.4 Elongation at break............................................................................................................................. 10 6.5 Specific lining resistance ................................................................................................................... 10 6.6 Abrasion resistance (only for waste water application) ................................................................. 10 6.7 Light ageing ......................................................................................................................................... 10 6.8 Materials in contact with water intended for human consumption ............................................... 11 7 Test Methods ....................................................................................................................................... 11 7.1 Routine tests ....................................................................................................................................... 11 7.2 Performance tests............................................................................................................................... 12 Annex A (informative) Quality assurance ...................................................................................................... 15 A.1 General ................................................................................................................................................. 15 A.2 Performance test; DN grouping ........................................................................................................ 16 A.3 Quality assessment system ............................................................................................................... 17 Annex B (informative) Lining process and materials .................................................................................... 18 B.1 Lining application process ................................................................................................................ 18 B.2 Material properties .............................................................................................................................. 18 B.3 Field of use, characteristics of transported waters ........................................................................ 19 Annex C (informative) Packaging ................................................................................................................... 20 Bibliography ..................................................................................................................................................... 21

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Foreword

This document (EN 15655:2009) has been prepared by Technical Committee CEN/TC 203 “Cast iron pipes, fittings and their joints”, the secretariat of which is held by AFNOR.

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 July 2009, and conflicting national standards shall be withdrawn at the latest by July 2009.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.

According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom.

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Introduction

This standard is in conformity with the general requirements already established by CEN/TC 164 in the field of water supply (e.g. potable water) and CEN/TC 165 in the field of waste water.

In respect of potential adverse effects on the quality of water intended for human consumption, caused by the product covered by this standard:

a) no information is provided as to whether the product may be used without restriction in any of the member states of the EU or EFTA;

b) it should be noted that, while awaiting the adoption of verifiable European criteria, existing national regulations concerning the use and/or the characteristics of this product remain in force.

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1 Scope

This European Standard defines the requirements and test methods applicable to factory applied internal polyurethane high duty corrosion protection of buried ductile iron pipes and fittings conforming to EN 545, EN 598 and EN 969 for use at permanent operating temperatures up to 45 °C.

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 545, Ductile iron pipes, fittings, accessories and their joints for water pipelines — Requirements and test methods

EN 598:2007, Ductile iron pipes, fittings, accessories and their joints for sewerage applications — Requirements and test methods

EN 969, Ductile iron pipes, fittings, accessories and their joints for gas pipelines — Requirements and test methods

EN ISO 4624, Paints and varnishes — Pull-off test for adhesion (ISO 4624:2002)

ISO 62:2008, Plastics — Determination of water absorption

ISO 527–3:1995, Plastics — Determination of tensile properties – Part 3: Test conditions for films and sheets

ISO 868, Plastics and ebonite — Determination of indentation hardness by means of a durometer (Shore hardness)

ISO 8501–1:2007, Representative photographic examples of the change of appearance imparted to steel when blast-cleaned with different abrasives

ISO 8503–1:1988, Preparation of steel substrates before application of paints and related products — Surface roughness characteristics of blast-cleaned steel substrates — Part 1: Specifications and definitions for ISO surface profile comparators for the assessment of abrasive blast-cleaned surfaces

3 Terms and definitions

For the purposes of this document, the following terms and definitions apply.

3.1 ductile iron cast iron used for pipes, fittings and accessories in which graphite is present substantially in spheroidal form

3.2 adhesion force per unit area, applied perpendicular to the surface, which is necessary to separate the lining from its substrate

3.3 indirect impact strength impact energy applied from outside of the pipe with deformation to which a lining can withstand without damage under defined test conditions

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3.4 hardness resistance of the lining to the penetration of a ball under defined test conditions

3.5 minimum lining thickness lower limit calculated for the polyurethane lining thickness by the mean value (x) minus two times the standard deviation (σ)

3.6 non porosity absence of holidays in a high voltage test under defined test conditions

3.7 polyurethane lining factory applied lining which consists of polyurethane on the inside of the pipe or fitting

Key

1 gasket seat 2 pipe barrel 3 spigot end 4 lining 5 internal socket profile

Figure 1 — Location of the defined pipe areas

Key

1 lining 2 internal socket profile

Figure 2 — Location of the defined fitting areas

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3.8 specific lining resistance surface related electric resistance of the lining perpendicular to the pipe wall

3.9 performance test test which is done once and is repeated according to a schedule or after relevant change of lining material and/or material supplier or change in process application

3.10 routine test test carried out to control the manufacturing process with a frequency defined by the manufacturer

4 Ordering information

The following information shall be supplied to the manufacturer by the purchaser.

Ductile iron pipes according to EN 545, EN 598 or EN 969 but internally coated in accordance with this European Standard shall be specified in the purchaser's enquiry and order by reference to this standard, e.g.

⎯ 5 000 m of ductile iron pipe DN 300 according to EN 545, internal polyurethane lining according to EN 15655; or

⎯ 10 pieces of ductile cast iron fittings DN 300 according to EN 598, internal PUR-lining according to EN 15655.

5 Technical Requirements

5.1 Surface preparation

Prior to application of the polyurethane lining, the surface of the pipes or fittings to be lined shall be clean, free of rust, loose constituent materials, dirt, oil, grease and moisture.

In cold weather, or anytime when the moisture tends to condense on the surface of the pipe or fitting, it shall be uniformly warmed for sufficient time to dry prior to cleaning. The surface temperature shall be maintained at least 5 °C above the dew point.

The surface shall be prepared by grinding (only for pipes) and grit blasting and be in compliance with level Sa 2-2.5 of ISO 8501-1 when checked according to 7.1.1. The surface roughness Ra in accordance with ISO 8503-1 shall be at least 12,5 micrometers which is equivalent to an anchored profile Rz of 63 micrometers or higher if required by the lining material provider or manufacturer.

5.2 Finished polyurethane lining

5.2.1 Appearance and continuity

The polyurethane lining shall be of:

⎯ uniform colour, except the spigot end and the internal socket profile which may be of a different colour and different coating material;

⎯ uniform appearance and smoothness except for admissible repairs;

⎯ free of visible defects (pinholes, bubbles, blisters, wrinkles, cracks or voids).

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Slight superficial variations of colour or brilliance due to repairs or prolonged exposure to sunlight or contact with other pipes are permissible.

5.2.2 Minimum lining thickness

When measured in accordance with 7.1.3, the lining thickness shall be as indicated in Table 1a for drinking water application and in Table 1b for waste water application.

Table 1a — Lining thickness of pipes and fittings for drinking water transport according to EN 545

DN mean value x

μm

(x-2σσσσ)

μm

80 - 200 ≥ 1 300 ≥ 800

> 200 ≥ 1 500

Table 1b — Lining thickness of pipes and fittings for waste water transport according to EN 598

DN mean value x

μm

(x-2σσσσ)

μm

80 - 200 ≥ 1 300 ≥ 800

250 - 700 ≥ 1 500 ≥ 800

700 – 1 000 ≥ 1 800 ≥ 1 000

> 1 000 ≥ 2 000 ≥ 1 000

5.3 Pipe ends

Spigot end and internal socket profile (see Figure 1) shall be coated with one of the following:

⎯ epoxy lining in accordance with EN 14901;

⎯ polyurethane in accordance with this standard with a minimum lining thickness of 150 μm;

⎯ bituminous paint (only for drinking water);

⎯ multilayer of epoxy, PUR-Epoxy.

When spigot end and socket entrance are coated with epoxy or polyurethane, the manufacturer shall ensure that the joint can be assembled. The coating thickness shall be checked according to 7.1.4.

5.4 Repairs

In case of holidays or damage, repairs shall be carried out in accordance with the manufacturer’s written instructions. Repairs shall be checked according to 7.1.5.

Fresh surfaces of pipes cut on site shall be protected by appropriate coatings according to the manufacturer's written instructions.

5.5 Marking

All pipes shall be marked legibly and durably according to the pipe standard EN 545, EN 598 or EN 969.

Reference to this standard shall be legibly and durably applied by any method upon the external surface.

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This shall be checked according to 7.1.6.

5.6 Non porosity

When tested in accordance with the test method described in 7.1.7 with a tension of 3,0 kV for mean lining thickness up to 1 500 μm and 4 kV for mean lining thickness greater than 1 500 μm, the lining shall be free from porosity.

5.7 Hardness

When assessed by testing in accordance with 7.1.8, the hardness of the polyurethane lining shall be at minimum 70 Shore D. Testing temperature shall be within the range of 10 °C to 30 °C.

5.8 Adhesion

The adhesion shall be at least 8 MPa when tested in accordance with 7.1.9.

6 Performance Requirements

6.1 Chemical resistance

The chemical resistance is determined by the change in weight of the polyurethane lining. When tested in accordance with 7.2.1, the weight increase resp. weight loss shall meet the requirements given in Table 2 when compared to the original weight.

Table 2 — Weight changes requirements

Property Unit Test method Clause Requirement

Mass change after

100 days in deionised water at 50 °C

% Immersion test 7.2.1.1 Less than 15 % weight increase

Mass change after subsequent drying

% ISO 62, method 2 Less than 2 % weight loss

Mass change after 100 days in sulphuric acid 10 % at 50 °C

% Immersion test 7.2.1.2 Less than 10 % weight increase

Mass change after subsequent drying

% ISO 62, method 2 Less than 4 % weight loss

6.2 Indirect Impact strength

Due to handling activities, the PU-lined pipes may fall or get impacts from outside with minor plastic deformations which can cause damages on the lining.

The minimum impact strength shall be determined in accordance with the test method defined in 7.2.2 with an impact energy E of at least 50 joules.

The lining shall subsequently show no damage when tested in accordance with 7.1.7.

6.3 Resistance to ovalization

When tested according to 7.2.3, the pipe shall comply with the requirements of 6.3.1 and subsequently 6.3.2.

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6.3.1 Integrity under service conditions

There shall be no detrimental damage to the polyurethane lining when the lined pipe is tested in accordance with 7.2.3 and subjected to an ovalization not less than given in Table 3. This shall be checked by visual inspection and holiday test (see 5.6) while the pipe is under load.

Table 3 — Pipe ovalization

DN

Pipe ovalization

%

100 to 250 2

300 to 600 3

700 to 2 000 4

6.3.2 Resistance to large deformations

After the test according to 6.3.1, the lining shall withstand without failure an ovalization equal to not less than twice the value given in Table 3. This shall be checked by visual inspection.

6.4 Elongation at break

The elongation at break shall be assessed by testing in accordance with the test method defined in 7.2.4.

The lining shall have a minimum elongation at break of 2,5 %.

6.5 Specific lining resistance

The specific lining resistance of the polyurethane lining shall be assessed by testing in accordance with the test method defined in 7.2.5.

The specific lining resistance of the polyurethane lining after immersion in a 0,1 M NaCl solution for 100 days shall be at least 108 Ω m2.

The ratio days 70 after resistancedays 100 after resistance shall not be less than 0,8 if the surface resistance of the lining after

100 days is less than 109 Ω m2. The test shall be carried out at room temperature (20 ± 5) °C.

6.6 Abrasion resistance (only for waste water application)

When tested in accordance with 7.2.6, the pipes shall not have an abrasion depth greater than 0,2 mm after 100 000 movements.

NOTE In order to test the abrasion resistance of fittings, straight fittings as flanged pipes, etc. may be lined as fittings and tested according to 7.2.6.

6.7 Light ageing

After 6 months storage outside exposed to atmospheric conditions, the lining shall show no damage when tested according to 7.2.7.

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6.8 Materials in contact with water intended for human consumption

When used under the conditions for which they are designed, in permanent or in temporary contact with water intended for human consumption, the polyurethane lining applied on ductile iron pipes and fittings shall not change the quality of that water to such an extent that it fails to comply with the requirements of national regulations.

For this purpose, reference shall be made to the relevant national regulations and standards, transposing EN standards when available, dealing with the influence of materials on water quality and to the requirements for external systems and components as given in EN 805.

NOTE A European Acceptance Scheme (EAS) is in course of development in relation to the Construction Products Directive and to the Drinking Water Directive; its requirements will be introduced in this standard when completed.

7 Test Methods

7.1 Routine tests

The following routine tests shall be carried out to control the lining production process in order to obtain a lining of high and stable quality.

7.1.1 Surface preparation

The blasted surface of the pipes and fittings shall be checked visually for compliance with preparation grade Sa 2-2.5 of ISO 8501-1. The surface roughness Ra shall be checked in accordance with ISO 8503-1.

7.1.2 Appearance and continuity

The appearance of the finished lining shall be checked visually.

7.1.3 Lining thickness

The thickness of the lining shall be measured with non-destructive instruments (e.g. based on magnetic or electro-magnetic principles) which have a measuring accuracy of ± 2 % and an automatic statistic evaluation.

A minimum of 10 measurements evenly distributed over the circumference at each end of the pipe (between 100 mm and 300 mm after the entrance) shall be carried out prior to the calculation of (Xmean – 2σ).

7.1.4 Pipe ends

The pipe ends are tested visually and with appropriate metering gauge.

7.1.5 Repairs

Repairs have to be carried out according to the manufacturer’s written instructions and then subjected to visual inspection. All repairs shall subsequently meet the non porosity test requirements.

7.1.6 Marking

The marking of the finished lining shall be checked visually.

7.1.7 Non porosity

AC or DC devices with a voltage defined in 5.6 and conductive rubber test electrodes are required as test instruments for testing the polyurethane lining.

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During the measurement, the test electrode shall be in contact with the surface of the lining, since any significant air gap would falsify the result. The presence of faults can be detected by the noise of the arcing spark or by signals emitted by the instrument.

7.1.8 Hardness

The test shall be carried out directly after production on the lined pipe after it has attained the ambient temperature between 10 °C and 30 °C. The test method of ISO 868 shall be used.

7.1.9 Adhesion

Adhesion shall be determined using the punch separation method according to EN ISO 4624 at (20 ± 5) °C directly on the pipe barrel for each DN group. The mean value of 6 measurements per pipe is indicated whereby no values under 8 MPa are acceptable. If one value under 8 MPa is obtained, then a new set of measurements shall be repeated at the same location of the pipe after it has been rotated by approximately 60°.

7.2 Performance tests

Performance tests are carried out once after selection of a lining material and an application process. They shall be carried out again for a new lining material and when a significant process parameter is changed.

7.2.1 Chemical resistance

The chemical resistance of the lining is tested by immersion in two different fluids.

7.2.1.1 Immersion test in deionised water

The immersion test in deionised water shall be performed on a detached specimen of polyurethane lining, approximately 1 mm in thickness, produced and cured in a similar way to the pipe lining.

The dry specimens shall be weighed, then immersed for 100 days in a tank of deionised water at 50 °C (+/- 2 °C). Immediately after removal from the tank and simple wiping off their surface with a dry cloth, the specimens shall be weighed again and their weight increase calculated.

Subsequently the absorbed solution shall be evaporated in accordance with ISO 62 Method 2; the samples shall be reweighed and their weight decrease calculated.

7.2.1.2 Immersion test in diluted sulphuric acid

The immersion test in diluted sulphuric acid shall be performed on a detached specimen of polyurethane lining, approximately 1 mm in thickness, produced and cured in a similar way to the pipe lining.

The dry specimens shall be weighed, then immersed for 100 days in 10 % volume diluted sulphuric acid at 50 °C (+/–2 °C). Immediately after removal from the tank and simple wiping off their surface with a dry cloth, the specimens shall be weighed again and their weight increase calculated.

Subsequently the absorbed solution shall be evaporated in accordance with ISO 62 Method 2; the samples shall be reweighed and their weight decrease calculated.

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7.2.2 Indirect impact strength

In order to test the impact strength, the specimen (pipe or pipe shell) shall be supported in such a way that the spring action of the specimen caused by the impact of the falling weight is absorbed. The front surface of the weight used in the test (5 000 g) shall be part of a spheroidal surface (diameter of sphere 25 mm). The height of fall of the falling weight shall be 100 cm; the impact energy shall be adjusted to within 5 %. Care shall be taken to ensure that the impact energy is maintained at a constant level by ensuring that little or no friction is encountered when the falling weight is dropped. The test shall be carried out at an ambient temperature of (20 ± 5) °C.

Any damage to the lining shall be detected immediately after impact in accordance with 7.1.7.

7.2.3 Resistance to ovalization

The test shall be carried out on a pipe section 500 mm ± 20 mm long, cut from the pipe barrel. The pipe section shall be placed on a support approximately 200 mm wide and 600 mm long, having a V shape with an angle between 170° and 180° (see Figure 3). The load shall be applied at the pipe crown through a loading beam approximately 50 mm wide and 600 mm long. Both the V support and the loading beam shall be covered with a sheet of elastomer with a thickness of 10 mm ± 5 mm and a hardness greater than or equal to 50 IRHD.

The load shall be increased steadily until the pipe ovalization reaches the relevant value given in Table 3. The integrity of the lining shall be checked by visual inspection and by holiday testing according to 7.1.7.

Figure 3 – Resistance to ovalization

The load shall then be increased steadily until the vertical deflection reaches twice the value previously measured. The absence of lining failure shall be checked by visual inspection.

NOTE The ovalization is 100 times the measured vertical deflection in millimetres (caused by the applied load) divided by the measured pipe external diameter in millimetres.

7.2.4 Elongation at break

The test shall be conducted according to ISO 527-3 with specimen type 2 produced from a free film.

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7.2.5 Specific lining resistance

Five specimens each with a test area of not less than 0,03 m2 taken from five different pipe barrels shall be tested. If one of the specimens does not satisfy the requirements, the test shall be repeated on 10 further specimens, in which case none of the specimens may fail. Prior to the test, each specimen shall be tested for non porosity (see 7.1.7). The test equipment shall comprise a counter electrode with a surface area of not less than 10 cm², a DC source with an output voltage of not less than 50 V, an ammeter and a voltmeter are also required. A 0,1 M NaCl solution shall be used as the test medium.

The specimens shall be exposed to the test medium for a duration of 100 days.

Either one of the following test arrangements may be used:

a) one end of the pipe specimen to be tested shall be sealed in such a way that the test medium cannot come into contact with the metal surface of the ductile iron pipe. For the purposes of measuring the resistance, the specimens may be removed from the test medium and wetted with any suitable electrolyte solution (towel method);

b) a vessel containing the test medium shall be attached to the surface of the pipe by means of an appropriate adhesive.

The measurement shall be carried out by attaching the positive pole of the DC source to the ductile iron pipe and the negative pole to the counter electrode. The counter electrode shall be immersed in the test medium. It may be the container wall as under a) or the vessel wall as under b).

The specific lining resistance Rs of the lining shall be calculated using the following equation:

2s m in. Ω

IAUR =

where

Rs is the specific lining resistance, in Ω * m²;

U is the voltage between counter electrode and ductile iron pipe, in V;

A is the test area, in m²;

I is the current flowing through the lining, in A.

The electrical voltage shall only be applied during the measurement. The first measurement shall be carried out at least 3 days after the specimen has been installed. Measurements shall subsequently be carried out at 10 days intervals.

Between the 70th and the 100th day, the linear straight regression shall be calculated from the measured values.

7.2.6 Abrasion resistance (only for waste water application)

The test shall be carried out according to 7.10.2 of EN 598:2007.

7.2.7 Light ageing resistance

After 6 months storage outside exposed to atmospheric conditions, the lining shall be tested for adhesion according to 7.1.9.

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Annex A (informative)

Quality assurance

A.1 General

The manufacturer has the responsibility to demonstrate the conformity of his products with this standard by:

⎯ carrying out performance tests according to Table A.1.

Table A.1 — Performance tests

Nr Parameter Requirement Clause Test method Clause

1 Chemical resistance to effluents

Less than 15 % weight increase after immersion

Less than 2 % weight loss after drying

6.1 Immersion in deionised water

ISO 62, method 2

7.2.1.1

Less than 10 % weight increase after immersion

Less than 4 % weight loss after drying

Immersion in diluted sulphuric acid 10 %

ISO 62, method 2

7.2.1.2

2 Indirect impact strength No porosity 6.2 Dropping weight

High voltage test

7.2.2

3 Ovalization resistance No damage 6.3 Static deformation test, holiday test, visual inspection

7.2.3

4 Elongation at break > 2,5 % 6.4 Tensile test 7.2.4

5 Specific lining resistance in 0,1 M NaCl

>108 Ωm²

6.5 Resistivity test

towel method or vessel method

7.2.5

6 Ratio of lining resistance > 0,8 6.5 Res 100 d/res. 70 d 7.2.5

7 Abrasion resistance (only for sewage application)

< 0,2 mm 6.6 EN 598 7.2.6

8 Light ageing resistance Adhesion (> 8 MPa) 6.7 Outside storage for 6 months

7.2.7

9 Materials in contact with potable water

6.8 Migration tests 6.8

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⎯ controlling the manufacturing process by routine tests according to Table A.2:

Table A.2 — Routine tests

Nr parameters Requirements Clause Tests frequency Clause

1 Surface preparation SA 2-2.5 of ISO 8501-1 5.1 Visual 100 % 7.1.1

2 Surface roughness Ra ≥ 12,5 μm 5.1 ISO 8503-1 Min. 1/shift 7.1.1

3 Appearance of finished lining

Uniform and smooth 5.2.1 Visual 100 % 7.1.2

4 Minimum lining

thickness

Different values acc. to DN and application

5.2.2 Non destructive instruments

error ± 2%

Min. 1/shift 7.1.3

5 Pipe ends painted parts

Length depending on type of socket

5.3 Appropriate measures

10 % 7.1.4

6 Repairs Manufacturer’s written instructions

5.4 High voltage test 100 % 7.1.5

7 Marking Legible and durable 5.5 Visual 10 % 7.1.6

8 Non porosity No spark at

3,0 or 4 kV

5.6 High voltage test instrument

1 per 1 000 pipes

7.1.7

9 Hardness > 70 Shore D 5.7 Hardness test Min. 1/shift 7.1.8

10 Adhesion > 8 MPa at 20 °C 5.8 Punch separation method acc. EN ISO 4624

1 per 1 000 pipes

7.1.9

A.2 Performance test; DN grouping

In order to ensure their fitness for purpose in the field of heavy duty corrosion protection, all the pipes shall fulfil the technical requirements of Clause 5 and performance requirements of Clause 6.

In order to demonstrate this, the performance tests of Clause 6 shall be performed on at least one DN for each of the groupings given in Table A.3. One DN is representative of a grouping when the performances are based on the same design parameters and lining process throughout the size range. If a grouping covers products of different designs and/or manufactured by different processes, the grouping shall be sub-divided. If for a manufacturer a grouping contains only one DN, this DN may be considered as part of the adjacent grouping provided that it is of identical design and manufactured by the same process.

Table A.3 – DN grouping

DN groupings Preferred DN in each grouping

80 to 200 150

250 to 600 400

700 to 1 000 800

1 100 to 2 000 1 400

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Where tests have been performed in accordance with the requirements and test methods of this standard (prior to the adoption of the standard) these tests results may be taken into account for the purpose of initial type testing.

A.3 Quality assessment system

The manufacturer controls the quality of its products during their manufacture by a system of process control in order to comply with the requirements of this standard. Wherever possible, statistical sampling techniques are used.

It is recommended that the manufacturer's quality system conforms to EN ISO 9001. If third party certification is involved, it is recommended that the certification body is accredited to EN 45011 or EN 45012, as applicable.

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Annex B (informative)

Lining process and materials

B.1 Lining application process

The pipe or fitting is heated to a temperature within the tolerances recommended by the lining material provider or manufacturer.

The lining is applied to the full length of each pipe or fitting (piece):

⎯ coating of the spigot and lining the internal socket profile, with epoxy or polyurethane;

⎯ lining of the pipe barrel or fitting corpus with polyurethane.

During the lining and curing periods, the coated piece is handled with due care in order to avoid any damage to the piece.

After lining cure, the piece is cooled to facilitate the inspection.

Repairs within the plant are acceptable. They are made under the manufacturer's responsibility. The manufacturer selects the method and process to be used and establishes a written repair procedure.

B.2 Material properties

B.2.1 General

All lining materials purchased or used under this specification should be packaged in suitable and approved containers. These containers should be plainly marked with the name of the manufacturer, type of material and batch or lot number where applicable. Bulk shipment may be allowed provided the above information is included in the bill of lading.

The lining materials should be packaged in containers suitable to keep the contents clean and dry during handling, shipping and storage. Storage and handling conditions should be in accordance with the manufacturer's written recommendations.

Precautions should be taken during handling, shipping and storage of all materials to prevent damage to the containers that would result in contamination of the lining materials. All contaminated or otherwise damaged materials should be discarded.

B.2.2 Polyurethane

The polyurethane used should be a solvent free two components system for spray application.

Polyurethane, mineral fillers, pigments and additives should be selected in order that the final product complies with the performance requirements given in Clause 6 of this standard.

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B.2.3 Epoxy resin

Depending on the method of application, the epoxy resin used should be a solvent free two-component system, for spray application.

Mineral fillers, pigments and additives should be selected in order that the final product complies with the performance requirements given in Clause 6 of this standard.

B.3 Field of use, characteristics of transported waters

Ductile iron pipelines supplied with the lining according to this standard can be used to transport all types of water and domestic effluents and most types of industrial effluents, provided that they are not exposed to values below pH 1 or greater than pH 13 according to Table B.1.

Table B.1 – Characteristics of transported waters

Transported medium pH of transported medium

Industrial waste water 1 to 6,4

Potable water 6,5 to 9

Waste water 9,1 to 13

Industrial process water < 13

By agreement between manufacturer and purchaser, the use can be extended to special applications, after consideration of other parameters such as temperature, nature of the main aggressive substances as organic solvents, frequency of occurrence, etc. and the performance of other parts of the pipelines such as rubber gaskets, accessories, etc.

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Annex C (informative)

Packaging

In order to prevent damage to the polyurethane lining, suitable mechanical protection should be provided, e.g. by end caps, wooden saddles, etc.

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Bibliography

[1] EN 45011, General requirements for bodies operating product certification systems (ISO/IEC Guide 65:1996)

[2] EN 45012, General requirements for bodies operating assessment and certification/registration of quality systems (ISO/IEC Guide 62:1996)

[3] ISO 8504–1, Preparation of steel substrates before application of paints and related products — Surface preparation methods — Part 1: General principles

[4] EN ISO 9001, Quality management systems — Requirements (ISO 9001:2000)

UNI EN 15655:2009


Riproduzione vietata - Legge 22 aprile 1941 Nº 633 e successivi aggiornamenti.UNIEnte Nazionale Italianodi UnificazioneVia Sannio, 220137 Milano, Italia


en 15655 2009 polyurethen lining

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