SIST EN 14628-1:2020
(Main)Ductile iron pipes, fittings and accessories - Requirements and test methods - Part 1: PE coatings
Ductile iron pipes, fittings and accessories - Requirements and test methods - Part 1: PE coatings
This European Standard defines the requirements and test methods applicable to factory applied extruded polyethylene coatings for the external corrosion protection of ductile iron pipes conforming to EN 545, EN 598 and EN 969 for use at operating temperatures up to 50 °C.
This European Standard does not cover ductile iron pipes protected with thin PE sleeve. Special works at site like drilling, tapping etc. may influence the corrosion protection properties. Those job steps shall be included in the instructions of pipe saddle and accessory manufacturers and all other essential installation instructions. These instructions are not part of this European Standard.
Rohre, Formstücke und Zubehörteile aus duktilem Gusseisen - Anforderungen und Prüfverfahren - Teil 1: Polyethylenumhüllung von Rohren
Dieses Dokument legt Anforderungen an und Prüfverfahren für werksseitig aufgebrachte extrudierte Polyethylenumhüllungen für den äußeren Korrosionsschutz von Rohren aus duktilem Gusseisen nach EN 545, EN 598 und EN 969 für die Verwendung bei Betriebstemperaturen bis 50 °C fest.
Dieses Dokument gilt nicht für Rohre aus duktilem Gusseisen, die mit einer dünnen PE-Schlauchfolie geschützt sind. Besondere Arbeiten an der Baustelle wie Anbohren, Setzen von Hausanschlussschellen usw. können die Korrosionsschutzeigenschaften beeinflussen. Diese Arbeitsschritte sind für die Aufnahme in die Einbauanleitungen der Hersteller von Anbohrschellen und Hausanschlussformstücken und in alle wesentlichen Arbeitsanweisungen vorgesehen. Diese Anweisungen sind nicht Bestandteil dieses Dokuments.
Tuyaux, raccords et accessoires en fonte ductile - Prescriptions et méthodes d’essai - Partie 1 : Revêtements en PE
Le présent document spécifie les prescriptions et les méthodes d’essai applicables aux revêtements en polyéthylène extrudés appliqués en usine pour protéger de la corrosion extérieure les tuyaux en fonte ductile conformes à l’EN 545, l’EN 598 et l’EN 969 et destinés à être utilisés à des températures de fonctionnement allant jusqu’à 50 °C.
Le présent document n’est pas applicable aux tuyaux en fonte ductile protégés par une manche en PE de faible épaisseur. Des travaux particuliers effectués à la pose, tels que perçage, taraudage, etc., peuvent avoir une incidence sur les propriétés de protection contre la corrosion. Il est prévu que ces étapes figurent dans les instructions des fabricants de selles et d’accessoires de tuyaux ainsi que dans toutes les autres instructions d’installation indispensables. Ces instructions ne font pas partie du présent document.
Cevi, fitingi in pribor iz duktilne železove litine - Zahteve in preskusne metode - 1. del: Polietilenska (PE) zunanja prevleka
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 14628-1:2020
01-september-2020
Nadomešča:
SIST EN 14628:2006
Cevi, fitingi in pribor iz duktilne železove litine - Zahteve in preskusne metode - 1.
del: Polietilenska (PE) zunanja prevleka
Ductile iron pipes, fittings and accessories - Requirements and test methods - Part 1: PE
coatings
Rohre, Formstücke und Zubehörteile aus duktilem Gusseisen - Anforderungen und
Prüfverfahren - Teil 1: Polyethylenumhüllung von Rohren
Tuyaux, raccords et accessoires en fonte ductile - Prescriptions et méthodes d’essai -
Partie 1 : Revêtements en PE
Ta slovenski standard je istoveten z: EN 14628-1:2020
ICS:
23.040.10 Železne in jeklene cevi Iron and steel pipes
23.040.40 Kovinski fitingi Metal fittings
25.220.01 Površinska obdelava in Surface treatment and
prevleke na splošno coating in general
SIST EN 14628-1:2020 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 14628-1:2020
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SIST EN 14628-1:2020
EN 14628-1
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2020
EUROPÄISCHE NORM
ICS 23.040.10; 23.040.40 Supersedes EN 14628:2005
English Version
Ductile iron pipes, fittings and accessories - Requirements
and test methods - Part 1: PE coatings
Tuyaux, raccords et accessoires en fonte ductile - Rohre, Formstücke und Zubehörteile aus duktilem
Prescriptions et méthodes d'essai - Partie 1 : Gusseisen - Anforderungen und Prüfverfahren - Teil 1:
Revêtements en PE Polyethylenumhüllung von Rohren
This European Standard was approved by CEN on 9 April 2020.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC 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
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 14628-1:2020 E
worldwide for CEN national Members.
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SIST EN 14628-1:2020
EN 14628-1:2020 (E)
Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Ordering information . 8
4.1 General. 8
4.2 Mandatory . 8
4.3 Options to be indicated by the purchaser . 8
5 Technical requirements . 9
5.1 Surface condition . 9
5.2 Material properties . 9
5.3 Finished polyethylene coating . 9
5.4 Repairs . 11
5.5 Marking . 11
5.6 Peeling strength . 11
5.7 Non-porosity . 11
6 Performance requirements . 11
6.1 Impact strength . 11
6.2 Indentation resistance . 12
6.3 Elongation at break . 12
6.4 Specific coating resistance . 13
6.5 Heat ageing . 13
6.6 Light ageing . 13
7 Test methods . 13
7.1 Peel resistance of the adhesive . 13
7.2 Coating thickness . 15
7.3 Non-porosity . 15
7.4 Impact strength . 15
7.5 Indentation resistance . 16
7.6 Elongation at break . 16
7.7 Specific coating resistance . 16
7.8 Heat ageing . 17
7.9 Light ageing . 17
Annex A (informative) Quality assurance . 18
A.1 General. 18
A.2 Performance test . 20
A.3 Quality assessment system . 20
Annex B (informative) Application process . 21
B.1 General. 21
B.2 Tubular extrusion method . 21
2
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EN 14628-1:2020 (E)
B.3 Flat die wrapping extrusion method . 22
Annex C (informative) Coating material . 23
C.1 General . 23
C.2 Polyethylene . 23
C.3 Adhesive . 23
Bibliography . 24
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SIST EN 14628-1:2020
EN 14628-1:2020 (E)
European foreword
This document (EN 14628-1:2020) 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 January 2021, and conflicting national standards shall
be withdrawn at the latest by January 2021.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 14628:2005.
In comparison with the previous edition, the following technical modifications have been made:
a) EN 14628 has been split into two parts. This part covers factory applied extruded polyethylene
coatings for the external corrosion protection of ductile iron pipes.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
4
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SIST EN 14628-1:2020
EN 14628-1:2020 (E)
Introduction
This document 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 document:
a) this document provides no information as to whether the product can be used without restriction
in any of the member states of the EU or EFTA;
b) it is also 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.
5
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SIST EN 14628-1:2020
EN 14628-1:2020 (E)
1 Scope
This document specifies the requirements and test methods applicable to factory applied extruded
polyethylene coatings for the external corrosion protection of ductile iron pipes according to EN 545,
EN 598 and EN 969 for use at operating temperatures up to 50 °C.
This document is not applicable to ductile iron pipes protected with thin PE sleeve. Special works at site
like drilling, tapping, etc. can influence the corrosion protection properties. Those job steps are
intended to be included in the instructions of pipe saddle and accessory manufacturers and all other
essential installation instructions. These instructions are not part of this document.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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, Ductile iron pipes, fittings, accessories and their joints for sewerage application - Requirements
and test methods
EN 969, Ductile iron pipes, fittings, accessories and their joints for gas pipelines – Requirements and test
methods
EN 1238, Adhesives - Determination of the softening point of thermoplastic adhesives (ring and ball)
EN ISO 527-1, Plastics - Determination of tensile properties - Part 1: General principles (ISO 527-1)
EN ISO 527-2, Plastics - Determination of tensile properties - Part 2: Test conditions for moulding and
extrusion plastics (ISO 527-2)
EN ISO 1133-1, Plastics - Determination of the melt mass-flow rate (MFR) and melt volume-flow rate
(MVR) of thermoplastics - Part 1: Standard method (ISO 1133-1)
EN ISO 3681, Binders for paints and varnishes - Determination of saponification value - Titrimetric
method (ISO 3681)
EN ISO 4892-2, Plastics - Methods of exposure to laboratory light sources - Part 2: Xenon-arc lamps (ISO
4892-2)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp/ui
3.1
ductile iron
cast iron used for pipes, fittings and accessories in which graphite is present substantially in spheroidal
form
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EN 14628-1:2020 (E)
3.2
elongation at break
relative change in length of the specimen of the polyethylene material when it breaks in a tensile test
3.3
heat ageing
artificial ageing of the polyethylene under the effects of hot air at a given temperature and over a given
period
3.4
impact strength
impact energy which a coating can withstand without damage under defined test conditions
3.5
indentation resistance
resistance of the coating to the penetration of a punch under defined test conditions
3.6
light ageing
artificial ageing of the polyethylene under the effects of xenon arc radiation at an elevated temperature
and at a given level of atmospheric humidity using a xenon test apparatus
3.7
minimum coating thickness
lower limit specified for the polyethylene coating thickness
3.8
non-porosity
absence of holidays in a high voltage test under defined test conditions
3.9
peeling resistance
force required to peel off a strip of polyethylene coating over a defined peeling path under defined test
conditions
3.10
polyethylene coating
coating which generally consists of two factory applied layers:
— an adhesive layer applied by extrusion or by hot spraying; and
— an extruded polyethylene compound outer layer applied either by the tubular extrusion method
(cross head extrusion) or by the flat die wrapping extrusion method.
3.11
specific coating resistance
surface related electric resistance of the coating perpendicular to the pipe wall
3.12
performance test
test which is done once and is repeated only after change of polymer supplier, polymer material or
relevant change in process application
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EN 14628-1:2020 (E)
3.13
routine test
test carried out to control the manufacturing process with a frequency defined by the manufacturer
3.14
reground material
material that has been used in the coating process at least once before subsequently ground or chopped
4 Ordering information
4.1 General
The following information shall be supplied to the manufacturer by the purchaser:
4.2 Mandatory
Ductile iron pipes according to EN 545, EN 598 or EN 969, but coated in accordance with this document
shall be specified in the purchaser's enquiry and order by reference to this document:
EXAMPLE 5 000 m of ductile iron pipe DN 300 according to EN 545;
external polyethylene coating according to EN 14628-1.
4.3 Options to be indicated by the purchaser
One of the following options shall be specified by the purchaser:
a) standard thickness, pipe not zinc-coated: PE-A;
b) reinforced thickness, pipe not zinc-coated: PE-B;
c) standard thickness, pipe zinc-coated: PE-C;
d) reinforced thickness, pipe zinc-coated: PE-D;
e) standard thickness, pipe zinc-alloy coated: PE-E;
f) reinforced thickness, pipe zinc-alloy coated: PE-F;
g) standard thickness, pipe zinc-alloy coated with finishing layer: PE-G;
h) reinforced thickness, pipe zinc-alloy coated with finishing layer: PE-H;
In case that no option is stipulated, option a) shall apply.
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5 Technical requirements
5.1 Surface condition
The polyethylene coating shall be applied to the works' standard oxide skin surface, zinc or zinc-alloy
coated surface of ductile iron pipes, with or without finishing layer. Immediately prior to application the
surface of the pipes shall be substantially free of rust (individual incipient rust spots are permissible),
loose constituent materials, dirt, oil, grease and moisture.
5.2 Material properties
5.2.1 Polyethylene
Only the use of virgin material or reground material up to 10 % is permitted. Reground material shall
comply with the technical requirements given in Clause 5 of this document.
5.2.2 Adhesive
The adhesive consists generally of a blend of rubber and high molecular weight resins and its physical
properties shall conform to the values specified in Table 1.
Table 1 — Adhesive physical properties
Property Standard Requirements
Softening point EN 1238 > 70 °C
Saponification value EN ISO 3681 < 3 mg KOH/g
5.3 Finished polyethylene coating
5.3.1 Appearance and continuity
The polyethylene coating shall be of:
— uniform colour, except for permitted marking;
— uniform appearance and smoothness, except admissible repairs.
5.3.2 Minimum coating thickness
The minimum coating thickness shall comply with the values given in Table 2 for the standard thickness
or for the reinforced thickness (see 4.3).
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Table 2 — Polyethylene coating thickness
Minimum coating thickness mm
Nominal size
Reinforced
DN
Standard thickness
thickness
80 to 100 1,8 2,5
125 to 250 2,0 2,5
300 to 450 2,2 3,0
500 to 700 2,5 3,5
800 to 1 400 3,0 3,5
1 500 to 2 000 3,5 4,0
The polyethylene coating thickness shall be measured in accordance with the method defined in 7.2.
Localized areas where the minimum coating thickness is not attained are permissible if these do not
2
exceed a total area of 5 cm over one metre length of pipe and the thickness of the coating is not less
than 90 % of the specified minimum coating thickness.
5.3.3 Ends of pipes
The spigot shall be not covered by the polyethylene coating over a free length “a” (see Figure 1).
Key
1 push in socket
Figure 1 — Ends of pipe
The uncoated spigot length “a” depends on the type of joint. It is the responsibility of the manufacturer
to define the appropriate uncoated length for each type of joint.
The front end of sockets may be uncoated on a length “b” depending on the application method (see
informative Annex B):
— tubular extrusion: < 5 mm, (15 mm after storage outside);
— flat die wrapping extrusion: < 50 mm.
The pipe ends surfaces not covered by the polyethylene coating (spigot, front end of socket and internal
section of socket) shall be coated with suitable coating(s) according to EN 545. Where such coatings are
in contact with water intended for human consumption, these shall comply with the relevant
requirements stated in the introduction of this document.
NOTE The pipe parts not covered by PE will be protected after laying using appropriate measures, e.g. heat
shrinkable sleeves, which are in compliance with EN 545, EN 598 or EN 969.
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5.4 Repairs
In case of holidays or damage, repairs shall be carried out in accordance with the manufacturer’s
written instructions. All repairs shall subsequently meet the non-porosity test requirements.
5.5 Marking
All pipes shall be marked legibly and durably according to the pipe standard EN 545, EN 598 or EN 969
with the addition: PE-A, PE-B, PE-C, PE-D, PE-E, PE-F, PE-G or PE-H (see 4.3). The transported medium
can be denoted by appropriate markings, e.g. by coextruded coloured stripes.
5.6 Peeling strength
Experience with the transport, laying and operation of polyethylene-coated pipes and pipelines has
shown that good bonding is necessary in order to avoid mechanical damage. It is, however, not
necessary to ensure the corrosion protection properties of polyethylene coating if the thickness and the
quality of the coating comply with the requirements of this document.
When tested in accordance with method 1 as defined in 7.1.2, the adhesive shall be selected in order to
provide a mean peel resistance of at least 10 N per cm strip width (zinc or zinc-alloy coating with or
without finishing layer) or 20 N per cm strip width (oxide skin) of polyethylene coating.
When tested in accordance with method 2 defined in 7.1.3, the peeling time shall be at least 0,04 DN in
minutes. The mean peeling rate is thus 10 mm/min.
5.7 Non-porosity
The polyethylene coating shall be free from pores extending through the coating, so, no electrical
puncture shall occur according to the test method defined in 7.3.
6 Performance requirements
6.1 Impact strength
The minimum impact strength shall be determined in accordance with the test method defined in 7.4.
The number of electrical punctures in the test shall be confined to range A as defined in Figure 2.
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EN 14628-1:2020 (E)
Key
X number of punctures
Y number of impacts
A range A test passed
B test to be continued
C test failed
Figure 2 — Test ranges of impact resistance
6.2 Indentation resistance
The indentation resistance shall be assessed by testing in accordance with the test method defined in
7.5.
The indentation depth of the polyethylene coating shall not exceed 0,3 mm.
6.3 Elongation at break
The elongation at break shall be assessed by testing in accordance with the test method defined in 7.6.
The elongation at break for polyethylene coating shall be at least 200 %.
Ten specimens taken from at least five different pipes shall be subjected to this test.
The maximum allowable failure rate shall be one specimen out of ten. If the result does not comply with
the requirements, a second test with ten specimens shall be carried out without any failure allowed.
12
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EN 14628-1:2020 (E)
6.4 Specific coating resistance
The specific coating resistance of the polyethylene coating shall be assessed by testing in accordance
with the test method defined in 7.7.
The specific coating resistance of the polyethylene coating after immersion in a 0,1 M NaCl solution for
8 2
100 days shall be at least 10 Ω m .
The ratio (resistance after 100 days)/(resistance after 70 days) shall not be less than 0,8 if the surface
resistance of the coating is only one decimal power above the minimum permissible value for 100 days.
6.5 Heat ageing
The heat ageing shall be assessed in accordance with the test method defined in 7.8.
The change in the melt-flow rate of the specimens after being subjected to the effects of heat shall not
exceed ± 35 % of the initial value (see Table A.1 of the informative Annex A).
6.6 Light ageing
The light ageing shall be assessed in accordance with the test method defined in 7.9.
The change in the melt-flow rate of the specimens after exposure to xenon arc radiation shall not
exceed ± 35 % of the initial value (see Table A.1 of the informative Annex A).
7 Test methods
7.1 Peel resistance of the adhesive
7.1.1 General
Test methods 1 and 2 are comparative tests to assess the resistance to peeling of the polyethylene
coating on ductile iron pipes. They do not provide absolute bonding strength values. Therefore, a direct
comparison of the values produced by test methods 1 and 2 is not possible. The test temperature shall
be between 15 °C and 25 °C.
The tests shall be carried out on a ductile pipe, either with the oxide layer, or zinc coated.
Test methods 1 and 2 may be used for all diameters of pipe. In all cases the test method used is to be
specified together with the determined peel resistance.
7.1.2 Test method 1
Conditions for use:
Maintenance of a constant peeling rate and a peeling angle of 90° to the surface of the pipe.
The following are required for the test:
A double-bladed saw or a corresponding cutting device and a peeling device with recording
dynamometer (example shown in Figure 3).
13
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EN 14628-1:2020 (E)
Figure 3 — Peeling resistance test method 1
Incisions shall be made in the polyethylene coating (e.g. by means of a double-bladed saw) down to the
wall of the ductile iron pipe to produce a strip of minimum 20 mm and maximum 50 mm in width
around the circumference. The strip thus produced shall be cut at right angle to the incisions and a
length of approximately 20 mm lifted from the pipe by means of a knife. The strip shall be peeled off in
the peeling device at a rate of 10 mm/min. The force applied shall be recorded. The mean value shall be
calculated from this recording and expressed in N, the first and last 20 mm being excluded from the
evaluation. In the test, the test path used may not contain any averaged path section in which the mean
peeling force is less than 75 % of the mean value required. A path section is deemed to be any part of
the path over the extent of the test path with a length of 20 mm.
7.1.3 Test method 2
The following are required for the test:
A double-bladed saw or a corresponding cutting device, a clamp, and a stop watch. The test
arrangement can be seen from Figure 4.
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EN 14628-1:2020 (E)
Figure 4 — Peeling resistance test method 2
Incisions shall be made in the polyethylene coating (e.g. by means of a double-bladed saw) down to the
wall of the ductile iron pipe to produce a strip of minimum 20 mm and maximum 50 mm in width. The
strip shall be cut off laterally at the lowest point of the circumference of the pipe and at the level of the
pipe axis. Starting at the latter cut, the strip shall be lifted from the ductile iron pipe by means of a knife
over a 45° section of the circumference of the pipe (see Figure 4). A weight equal to 2,0 kg (pipe with
oxide skin) or 1,0 kg (zinc coated pipe) per cm width of strip shall be attached to the free end.
The peeling time required for the 45° section terminating at the lowest point shall then be measured.
7.2 Coating thickness
The thickness of the coating shall be measured with non-destructive instruments (e.g. based on
magnetic or electro-magnetic principles) with a measuring accuracy of ± 1 %.
A sufficient numb
...
SLOVENSKI STANDARD
oSIST prEN 14628:2020
01-januar-2020
Cevi, fitingi in pribor iz duktilne železove litine - Zahteve in preskusne metode - 1.
del: Polietilenska (PE) zunanja prevleka
Ductile iron pipes, fittings and accessories - Requirements and test methods - Part 1: PE
coatings
Rohre, Formstücke und Zubehörteile aus duktilem Gusseisen - Anforderungen und
Prüfverfahren - Polyethylenumhüllung von Rohren
Ta slovenski standard je istoveten z: prEN 14628-1
ICS:
23.040.10 Železne in jeklene cevi Iron and steel pipes
23.040.40 Kovinski fitingi Metal fittings
25.220.01 Površinska obdelava in Surface treatment and
prevleke na splošno coating in general
oSIST prEN 14628:2020 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 14628:2020
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oSIST prEN 14628:2020
DRAFT
EUROPEAN STANDARD
prEN 14628
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2019
ICS 23.040.10; 23.040.40 Will supersede EN 14628:2005
English Version
Ductile iron pipes, fittings and accessories - Requirements
and test methods - Part 1: PE coatings
Rohre, Formstücke und Zubehörteile aus duktilem
Gusseisen - Anforderungen und Prüfverfahren -
Polyethylenumhüllung von Rohren
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 203.
If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations
which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 14628:2019 E
worldwide for CEN national Members.
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oSIST prEN 14628:2020
prEN 14628-1:2019 (E)
Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Ordering information . 8
4.1 General. 8
4.2 Mandatory . 8
4.3 Options to be indicated by the purchaser . 8
5 Technical Requirements . 9
5.1 Surface condition . 9
5.2 Material properties . 9
5.2.1 Polyethylene . 9
5.2.2 Adhesive . 9
5.3 Finished polyethylene coating . 9
5.3.1 Appearance and continuity . 9
5.3.2 Minimum coating thickness . 9
5.3.3 Ends of pipes . 10
5.4 Repairs . 11
5.5 Marking . 11
5.6 Peeling strength . 11
5.7 Non-porosity . 11
6 Performance requirements . 11
6.1 Impact strength . 11
6.2 Indentation resistance . 12
6.3 Elongation at break . 12
6.4 Specific coating resistance . 13
6.5 Heat ageing . 13
6.6 Light ageing . 13
7 Test Methods . 13
7.1 Peel resistance of the adhesive . 13
7.1.1 General. 13
7.1.2 Test method 1 . 13
7.1.3 Test method 2 . 14
7.2 Coating thickness . 15
7.3 Non-porosity . 15
7.4 Impact strength . 15
7.5 Indentation resistance . 16
7.6 Elongation at break . 16
7.7 Specific coating resistance . 16
7.8 Heat ageing . 17
7.9 Light ageing . 17
Annex A (informative) Quality assurance . 18
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A.1 General . 18
A.2 Performance test . 20
A.3 Quality assessment system . 20
Annex B (informative) Application process . 21
B.1 General . 21
B.2 Tubular extrusion method . 21
B.3 Flat die wrapping extrusion method . 22
Annex C (informative) Coating material . 23
C.1 General . 23
C.2 Polyethylene . 23
C.3 Adhesive . 23
Bibliography . 24
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European foreword
This document (prEN 14628-1:2019) 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 document is currently submitted to the CEN Enquiry.
This document will supersede EN 14628:2005.
In comparison with the previous edition, the following technical modifications have been made:
a) EN 14628 has been split into two parts. This part covers factory applied extruded polyethylene
coatings for the external corrosion protection of ductile iron pipes.
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Introduction
This document 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 document:
a) this document provides no information as to whether the product can be used without
restriction in any of the member states of the EU or EFTA;
b) it is also 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 document defines the requirements and test methods applicable to factory applied extruded
polyethylene coatings for the external corrosion protection of ductile iron pipes according to EN 545,
EN 598 and EN 969 for use at operating temperatures up to 50 °C.
This document does not cover ductile iron pipes protected with thin PE sleeve. Special works at site like
drilling, tapping etc. can influence the corrosion protection properties. Those job steps are intended to
be included in the instructions of pipe saddle and accessory manufacturers and all other essential
installation instructions. These instructions are not part of this document.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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, Ductile iron pipes, fittings, accessories and their joints for sewerage application – Requirements
and test methods
EN 969, Ductile iron pipes, fittings, accessories and their joints for gas pipelines – Requirements and test
methods
EN 1238, Adhesives – Determination of the softening point of thermoplastic adhesives (ring and ball)
EN ISO 527-1, Plastics – Determination of tensile properties - Part 1 : General principles (ISO 527-1)
EN ISO 527-2, Plastics – Determination of tensile properties - Part 2 : Test conditions for moulding and
extrusion plastics (ISO 527-2)
EN ISO 1133, Plastics – Determination of the melt mass - flow rate (MFR) and the melt volume - flow rate
(MVR) of thermoplastics (ISO 1133:1997)
EN ISO 3681, Binders for paints and varnishes – Determination of saponification value – Titrimetric
method (ISO 3681)
EN ISO 4892-2, Plastics – Methods of exposure to laboratory light sources – Part 2: Xenon-arc sources
(ISO 4892-2)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
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3.1
ductile iron
cast iron used for pipes, fittings and accessories in which graphite is present substantially in spheroidal
form
3.2
elongation at break
relative change in length of the specimen of the polyethylene material when it breaks in a tensile test
3.3
heat ageing
artificial ageing of the polyethylene under the effects of hot air at a given temperature and over a given
period
3.4
impact strength
impact energy which a coating can withstand without damage under defined test conditions
3.5
indentation resistance
resistance of the coating to the penetration of a punch under defined test conditions
3.6
light ageing
artificial ageing of the polyethylene under the effects of xenon arc radiation at an elevated temperature
and at a given level of atmospheric humidity using a xenon test apparatus
3.7
minimum coating thickness
lower limit specified for the polyethylene coating thickness
3.8
non-porosity
absence of holidays in a high voltage test under defined test conditions
3.9
peeling resistance
force required to peel off a strip of polyethylene coating over a defined peeling path under defined test
conditions
3.10
polyethylene coating
coating which generally consists of two factory applied layers:
— an adhesive layer applied by extrusion or by hot spraying; and
— an extruded polyethylene compound outer layer applied either by the tubular extrusion method
(cross head extrusion) or by the flat die wrapping extrusion method.
3.11
specific coating resistance
surface related electric resistance of the coating perpendicular to the pipe wall
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3.12
performance test
test which is done once and is repeated only after change of polymer supplier, polymer material or
relevant change in process application
3.13
routine test
test carried out to control the manufacturing process with a frequency defined by the manufacturer
3.14
regrinded material
material that has been used in the coating process at least once before subsequently ground or chopped
4 Ordering information
4.1 General
The following information shall be supplied to the manufacturer by the purchaser:
4.2 Mandatory
Ductile iron pipes according to EN 545, EN 598 or EN 969, but coated in accordance with this document
shall be specified in the purchasers enquiry and order by reference to this document:
EXAMPLE 5 000 m of ductile iron pipe DN 300 according to EN 545;
external polyethylene coating according to EN 14628-1.
4.3 Options to be indicated by the purchaser
One of the following options shall be specified by the purchaser:
a) standard thickness, pipe not zinc-coated: PE-A;
b) reinforced thickness, pipe not zinc-coated: PE-B;
c) standard thickness, pipe zinc-coated: PE-C;
d) reinforced thickness, pipe zinc-coated: PE-D;
e) standard thickness, pipe zinc-alloy coated: PE-E;
f) reinforced thickness, pipe zinc-alloy coated: PE-F;
g) standard thickness, pipe zinc-alloy coated with finishing layer: PE-G;
h) reinforced thickness, pipe zinc-alloy coated with finishing layer: PE-H;
In case that no option is stipulated, option a) shall apply.
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5 Technical Requirements
5.1 Surface condition
The polyethylene coating shall be applied to the works' standard oxide skin surface, zinc or zinc-alloy
coated surface of ductile iron pipes, with or without finishing layer. Immediately prior to application the
surface of the pipes shall be substantially free of rust (individual incipient rust spots are permissible),
loose constituent materials, dirt, oil, grease and moisture.
5.2 Material properties
5.2.1 Polyethylene
Only the use of virgin material or regrinded material up to 10 % is permitted. Regrinded material shall
comply with the technical requirements given in Clause 5 of this document.
5.2.2 Adhesive
The adhesive consists generally of a blend of rubber and high molecular weight resins and its physical
properties shall conform to the values specified in Table 1.
Table 1 — Adhesive physical properties
Property Standard Requirements
Softening point EN 1238 > 70 °C
Saponification value EN ISO 3681 < 3 mg KOH/g
5.3 Finished polyethylene coating
5.3.1 Appearance and continuity
The polyethylene coating shall be of:
— uniform colour, except for permitted marking;
— uniform appearance and smoothness, except admissible repairs.
5.3.2 Minimum coating thickness
The minimum coating thickness shall comply with the values given in Table 2 for the standard thickness
or for the reinforced thickness (see 4.2.).
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Table 2 — Polyethylene thickness
Minimum coating thickness mm
Nominal size
Reinforced
DN
Standard thickness
thickness
80 to 100 1,8 2,5
125 to 250 2,0 2,5
300 to 450 2,2 3,0
500 to 700 2,5 3,5
800 to 1 400 3,0 3,5
1 500 to 2 000 3,5 4,0
The polyethylene coating thickness shall be measured in accordance with the method defined in 7.2.
Localized areas where the minimum coating thickness is not attained are permissible if these do not
2
exceed a total area of 5 cm over one metre length of pipe and the thickness of the coating is not less
than 90 % of the specified minimum coating thickness.
5.3.3 Ends of pipes
The spigot shall be not covered by the polyethylene coating over a free length “a” (see Figure 1).
Key
1 Push in socket
Figure 1 — Ends of pipe
The uncoated spigot length “a” depends on the type of joint. It is the responsibility of the manufacturer
to define the appropriate uncoated length for each type of joint.
The front end of sockets may be uncoated on a length “b” depending on the application method (see
Annex B):
— tubular extrusion: < 5 mm, (15 mm after storage outside);
— flat die wrapping extrusion: < 50 mm.
The pipe ends surfaces not covered by the polyethylene coating (spigot, front end of socket and internal
section of socket) shall be coated with suitable coating(s) according to EN 545. Where such coatings are
in contact with water intended for human consumption, these shall comply with the relevant
requirements stated in the introduction of this document.
NOTE The pipe parts not covered by PE will be protected after laying using appropriate measures, e.g. heat
shrinkable sleeves, which are in compliance with EN 545, EN 598 or EN 969.
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5.4 Repairs
In case of holidays or damage, repairs shall be carried out in accordance with the manufacturer’s
written instructions. All repairs shall subsequently meet the non-porosity test requirements.
5.5 Marking
All pipes shall be marked legibly and durably according to the pipe standard EN 545, EN 598 or EN 969
with the addition: PE-A, PE-B, PE-C, PE-D, PE-E, PE-F, PE-G or PE-H (see 4.3). The transported medium
can be denoted by appropriate markings, e.g. by coextruded coloured stripes.
5.6 Peeling strength
Experience with the transport, laying and operation of polyethylene-coated pipes and pipelines has
shown that good bonding is necessary in order to avoid mechanical damage. It is, however, not
necessary to ensure the corrosion protection properties of polyethylene coating if the thickness and the
quality of the coating comply with the requirements of this document.
When tested in accordance with method 1 as defined in 7.1.2, the adhesive shall be selected in order to
provide a mean peel resistance of at least 10 N per cm strip width (zinc or zinc-alloy coating with or
without finishing layer) or 20 N per cm strip width (oxide skin) of polyethylene coating.
When tested in accordance with method 2 defined in 7.1.3, the peeling time shall be at least 0,04 DN in
minutes. The mean peeling rate is thus 10 mm/min.
5.7 Non-porosity
The polyethylene coating shall be free from pores extending through the coating, so, no electrical
puncture shall occur according to the test method defined in 7.3.
6 Performance requirements
6.1 Impact strength
The minimum impact strength shall be determined in accordance with the test method defined in 7.4.
The number of electrical punctures in the test shall be confined to range A as defined in Figure 2.
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Key
X Number of punctures
Y Number of impacts
A Range A Test passed
B Test to be continued
C Test failed
Figure 2 — Test ranges of impact resistance
6.2 Indentation resistance
The indentation resistance shall be assessed by testing in accordance with the test method defined in
7.5.
The indentation depth of the polyethylene coating shall not exceed 0,3 mm.
6.3 Elongation at break
The elongation at break shall be assessed by testing in accordance with the test method defined in 7.6.
The elongation at break for polyethylene coating shall be at least 200 %.
Ten specimens taken from at least five different pipes shall be subjected to this test.
The maximum allowable failure rate shall be one specimen out of ten. If the result does not comply with
the requirements, a second test with ten specimens shall be carried out without any failure allowed.
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6.4 Specific coating resistance
The specific coating resistance of the polyethylene coating shall be assessed by testing in accordance
with the test method defined in 7.7.
The specific coating resistance of the polyethylene coating after immersion in a 0,1 M NaCl solution for
8 2
100 days shall be at least 10 Ω m .
The ratio (resistance after 100 days)/(resistance after 70 days) shall not be less than 0,8 if the surface
resistance of the coating is only one decimal power above the minimum permissible value for 100 days.
6.5 Heat ageing
The heat ageing shall be assessed in accordance with the test method defined in 7.8.
The change in the melt-flow rate of the specimens after being subjected to the effects of heat shall not
exceed ± 35 % of the initial value.
6.6 Light ageing
The light ageing shall be assessed in accordance with the test method defined in 7.9.
The change in the melt-flow rate of the specimens after exposure to xenon arc radiation shall not
exceed ± 35 % of the initial value.
7 Test Methods
7.1 Peel resistance of the adhesive
7.1.1 General
Test methods 1 and 2 are comparative tests to assess the resistance to peeling of the polyethylene
coating on ductile iron pipes. They do not provide absolute bonding strength values. Therefore, a direct
comparison of the values produced by test methods 1 and 2 is not possible. The test temperature shall
be between 15 °C and 25 °C.
The tests shall be carried out on a ductile pipe, either with the oxide layer, or zinc coated.
Test methods 1 and 2 may be used for all diameters of pipe. In all cases the test method used is to be
specified together with the determined peel resistance.
7.1.2 Test method 1
Conditions for use:
Maintenance of a constant peeling rate and a peeling angle of 90° to the surface of the pipe.
The following are required for the test:
A double-bladed saw or a corresponding cutting device and a peeling device with recording
dynamometer (example shown in Figure 3).
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Figure 3 — Peeling resistance test method 1
Incisions shall be made in the polyethylene coating (e.g. by means of a double-bladed saw) down to the
wall of the ductile iron pipe to produce a strip of minimum 20 mm and maximum 50 mm in width
around the circumference. The strip thus produced shall be cut at right angle to the incisions and a
length of approximately 20 mm lifted from the pipe by means of a knife. The strip shall be peeled off in
the peeling device at a rate of 10 mm/min. The force applied shall be recorded. The mean value shall be
calculated from this recording and expressed in N, the first and last 20 mm being excluded from the
evaluation. In the test, the test path used may not contain any averaged path section in which the mean
peeling force is less than 75 % of the mean value required. A path section is deemed to be any part of
the path over the extent of the test path with a length of 20 mm.
7.1.3 Test method 2
The following are required for the test:
A double-bladed saw or a corresponding cutting device, a clamp, and a stop watch. The test
arrangement can be seen from Figure 4.
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Figure 4 — Peeling resistance test method 2
Incisions shall be made in the polyethylene coating (e.g. by means of a double-bladed saw) down to the
wall of the ductile iron pipe to produce a strip of minimum 20 mm and maximum 50 mm in width. The
strip shall be cut off laterally at the lowest point of the circumference of the pipe and at the level of the
pipe axis. Starting at the latter cut, the strip shall be lifted from the ductile iron pipe by means of a knife
over a 45° section of the circumference of the pipe (see Figure 4). A weight equal to 2,0 kg (pipe with
oxid
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