prEN 18213-2
(Main)District heating and district cooling pipes - Bonded single and twin pipe systems for directly buried hot and cold water networks - Part 2: Qualification testing of PE-Welder
District heating and district cooling pipes - Bonded single and twin pipe systems for directly buried hot and cold water networks - Part 2: Qualification testing of PE-Welder
This document specifies the methods of examining the knowledge and skill set of the PE-welder required to carry out on-site joint casing connections on thermally insulated single and twin pipe systems for directly buried hot and cold water networks according to and .The application of these specified methods specifications ensures that the examination is carried out according to a standardised examining procedure.
This document applies to the following processes:
- preparatory works for joint casing assembly;
- assembling and testing the elements for surveillance systems;
For special surveillance systems it can be important to have additional training.preparatory works for joint casing system installation;
- assembling weldable joint casing system;executing hot gas welding and hot gas extrusion weldingverifying joint tightness (leakage testing);
- thermally insulating the joint casing (PUR foaming or half-shell);
- sealing fill & vent openings (weldable plugs);
- assessing overall installation quality of the completed joint connection (non-destructive).
Fernwärme- und Fernkälterohre - Ein- und Doppelrohr-Verbundsysteme für direkt erdverlegte Fernwärme- und Fernkältenetze - Teil 2: Prüfung von PE-Schweißern
Dieses Dokument legt Verfahren zur Prüfung der für die baustellenseitige Herstellung von Mantelrohrverbindungen von wärmegedämmten Einzel- und Doppelrohr-Verbundsystemen für direkt erdverlegte Fernwärme- und Fernkältenetze nach EN 13941 1:2019 [17] und EN 13941 2:2019 [18] erforderlichen Kenntnisse und Fähigkeiten von PE-Schweißern fest.
Durch die Anwendung dieser festgelegten Verfahren wird sichergestellt, dass die Prüfung nach einem genormten Prüfverfahren erfolgt.
Dieses Dokument behandelt die folgenden Prozesse:
- Vorarbeiten zur Muffenmontage;
- Montage und Prüfung der Elemente von Überwachungssystemen;
ANMERKUNG Für spezielle Überwachungssysteme können zusätzliche Schulungen erforderlich sein.
- Vorarbeiten zur Montage von Mantelrohrverbindungssystemen;
- Montage von schweißbaren Mantelrohrverbindungssystemen;
- Heißgasschweißen und Heißgas-Extrusionsschweißen;
- Überprüfung der Dichtheit von Verbindungen (Dichtheitsprüfung);
- Wärmedämmung der Verbindungsmuffe (PUR-Verschäumung oder Halbschale);
- Befüll- und Entlüftungsöffnungen der Dichtung (schweißbare Stopfen);
- (zerstörungsfreie) Beurteilung der allgemeinen Qualität der Installation der fertiggestellten Verbindung.
Tuyaux de chauffage et de refroidissement urbains - Systèmes bloqués de monotubes et bitubes pour les réseaux d'eau chaude et froide enterrés directement - Partie 2 : Épreuve de qualification de soudeur de PE
Le présent document spécifie les méthodes d’examen des connaissances et compétences exigées d’un soudeur PE pour réaliser des raccordements de protection de l’assemblage sur site sur des systèmes monotubes ou bitubes isolés thermiquement pour les réseaux d'eau chaude et froide enterrés directement conformément à l’EN 13941‑1:2019 [17] et à l’EN 13941‑2:2019 [18].
L’application de ces méthodes spécifiées garantit que l’examen est réalisé selon un mode opératoire d’examen normalisé.
Le présent document s’applique aux processus suivants :
- travaux préparatoires pour la protection de l’assemblage ;
- assemblage et essai des éléments destinés aux systèmes de surveillance ;
NOTE Une formation complémentaire peut être nécessaire pour les systèmes de surveillance spéciaux.
- travaux préparatoires pour l’installation du système de protection de l’assemblage ;
- assemblage du système de protection de l’assemblage soudable ;
- exécution du soudage au gaz chaud et du soudage par extrusion au gaz chaud ;
- contrôle d’étanchéité des joints (essais d’étanchéité) ;
- isolation thermique de la protection de l’assemblage (injection de mousse PUR ou demi-gaine) ;
- étanchéité des trous de remplissage et de mise à l’évent (bouchons soudables) ;
- évaluation (non destructive) de la qualité d’installation globale du raccord de protection de l’assemblage.
Cevi za daljinsko ogrevanje in daljinsko hlajenje - Sistemi s spojenimi eno- in dvocevnimi sistemi za neposredno vkopana omrežja za toplo in hladno vodo - 2. del: Preskus usposobljenosti PE-varilca
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-december-2025
Cevi za daljinsko ogrevanje in daljinsko hlajenje - Sistemi s spojenimi eno- in
dvocevnimi sistemi za neposredno vkopana omrežja za toplo in hladno vodo - 2.
del: Preskus usposobljenosti PE-varilca
District heating and district cooling pipes - Bonded single and twin pipe systems for
directly buried hot and cold water networks - Part 2: Qualification testing of PE-Welder
Fernwärme- und Fernkälterohre - Ein- und Doppelrohr-Verbundsysteme für direkt
erdverlegte Fernwärme- und Fernkältenetze - Teil 2: Prüfung von PE-Schweißern
Tuyaux de chauffage et de refroidissement urbains - Systèmes bloqués de monotubes et
bitubes pour les réseaux d'eau chaude et froide enterrés directement - Partie 2 :
Épreuve de qualification de soudeur de PE
Ta slovenski standard je istoveten z: prEN 18213-2
ICS:
23.040.07 Cevovodi za daljinsko Pipeline and its parts for
ogrevanje in njihovi deli district heat
23.040.99 Drugi sestavni deli za Other pipeline components
cevovode
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2025
ICS 23.040.07; 23.040.99
English Version
District heating and district cooling pipes - Bonded single
and twin pipe systems for directly buried hot and cold
water networks - Part 2: Qualification testing of PE-Welder
Tuyaux de chauffage et de refroidissement urbains - Fernwärme- und Fernkälterohre - Ein- und
Systèmes bloqués de monotubes et bitubes pour les Doppelrohr-Verbundsysteme für direkt erdverlegte
réseaux d'eau chaude et froide enterrés directement - Fernwärme- und Fernkältenetze - Teil 2: Prüfung von
Partie 2 : Épreuve de qualification de soudeur de PE PE-Schweißern
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 107.
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, Türkiye 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
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 18213-2:2025 E
worldwide for CEN national Members.
Page
Contents
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Qualification of Test Institute, Supervisor . 7
4.1 Test Institute . 7
4.2 Supervisor . 8
5 Admission to qualification . 8
6 Testing knowledge and skills. 8
6.1 General . 8
6.2 Theoretical test . 8
6.2.1 General . 8
6.2.2 Questions . 9
6.3 Practical test . 9
6.3.1 General . 9
6.3.2 Equipment . 10
6.3.3 Test piece preparation and assembling of weldable joint casing system . 10
6.3.4 Test piece preparation and assembling of T-piece for hot gas welding and hot
gas extrusion welding . 11
7 Examination of skills and knowledge . 13
8 Test piece assembly . 13
8.1 Difficulties and corrections whilst fitting the test piece . 13
8.2 Inspection requirements . 13
9 Evaluation and acceptance criteria of test piece and test specimens . 13
9.1 General . 13
9.2 Evaluation of test piece and test specimen . 14
9.2.1 General . 14
9.2.2 Measuring elements . 14
9.2.3 Visual inspection of processed welded joint casing system . 14
9.2.4 Visual inspection of processed hot gas welding and hot gas extrusion welding . 14
9.2.5 Preparation of test piece . 16
9.2.6 Visual assessment of test piece and specimen . 16
9.2.7 Test procedure of bending test . 16
9.2.8 Welded PE plugs . 16
10 Test result and qualification test certificate . 18
10.1 Overall assessment . 18
10.2 Theoretical Exam . 18
10.3 Practical Exam . 18
10.4 Qualification certificate and identity card . 18
10.4.1 Qualification certificate. 18
10.4.2 Qualification identity card . 19
11 Failed exam . 19
12 Period of validity. 20
13 Qualification test certificate renewal . 20
Annex A (normative) Qualification of PE-Welders . 21
A.1 Knowledge and skills . 21
A.2 Background for training and testing . 21
A.3 Subjects for training and testing . 21
A.3.1 General . 21
A.3.2 Polyethylene (PE) casing . 22
A.3.3 Surveillance systems . 22
A.3.4 PUR-foam system . 22
A.3.5 Joint casing systems . 23
A.3.6 Joint installation . 25
Annex B (normative) Checklist of welded joint casing systems as well as hot gas and hot
gas extrusion welding . 29
Annex C (informative) Further test examples for hot gas extrusion welding . 32
C.1 General . 32
C.2 Weld on main pipe only . 32
C.3 Weld on main pipe and branch . 33
C.4 Weld on saddle piece . 33
C.5 Weld at branch . 34
Annex D (informative) Template PE-Welder's qualification test certificate . 35
Annex E (informative) Template PE-Welder's qualification test identity card. 36
E.1 Front of the identity card (Example) . 36
E.2 Back of the identity card (Example) . 36
Bibliography . 39
European foreword
This document (prEN 18213-2:2025) by Technical Committee CEN/TC 107 “District heating and cooling
systems”, the secretariat of which is held by DS.
This document is currently submitted to the CEN Enquiry.
Introduction
The installation quality of the joint casing application and of measuring elements for surveillance
systems also as welding of PE-casings is crucial for the service life and efficiency of district heating and
cooling networks, built with factory-made thermally insulated pipe, fitting and valve assemblies.
Damage caused by improper application leads to moisture ingress into the thermal insulation and to
corrosion of the steel service pipe.
This document deals with the installation of weldable joint casing systems according to EN 489-1[1] as
well as with hot gas welding and hot gas extrusion welding.
The PE-welder's ability to follow verbal or written instructions and to evidence his skills are important
factors in ensuring the integrity of the joint casing connection.
This document serves as the basis for the general recognition by test and certification bodies of the PE-
welder's competency and qualification.
PE-welders can also take an examination according to prEN 18213-1[2] to demonstrate their ability to
install sealable joint casing systems.
This document is an integral part of the standards for bonded pipe systems for district heating and
cooling.
EN 13941-
Other standards from CEN/TC 107 covering this subject: EN 253[3], EN 448[4], EN 489-1[1],
1[5], EN 13941-2[6], EN 14419[7], EN 15698-1[8], EN 15698-2[9], EN 17248[10], EN 17415-1[11], EN
17415-2[12], EN 17415-3[13], EN 17878-1[14], EN 17878-2[15], EN 17878-3[16] and prEN 18213-1[2]
are listed in the bibliography.
1 Scope
This document specifies the methods of examining the knowledge and skill set of the PE-welder
required to carry out on-site joint casing connections on thermally insulated single and twin pipe
systems for directly buried hot and cold water networks according to EN 13941-1:2019[17] and EN
13941-2:2019[18].
The application of these specified methods specifications ensures that the examination is carried out
according to a standardised examining procedure.
This document applies to the following processes:
— preparatory works for joint casing assembly;
— assembling and testing the elements for surveillance systems;
NOTE For special surveillance systems it can be important to have additional training.
— preparatory works for joint casing system installation;
— assembling weldable joint casing system;
— executing hot gas welding and hot gas extrusion welding
— verifying joint tightness (leakage testing);
— thermally insulating the joint casing (PUR foaming or half-shell);
— sealing fill & vent openings (weldable plugs);
— assessing overall installation quality of the completed joint connection (non-destructive).
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 253, District heating pipes - Bonded single pipe systems for directly buried hot water networks - Factory
made pipe assembly of steel service pipe, polyurethane thermal insulation and a casing of polyethylene
EN 448, District heating pipes - Bonded single pipe systems for directly buried hot water networks - Factory
made fitting assemblies of steel service pipes, polyurethane thermal insulation and a casing of polyethylene
EN 489-1, District heating pipes - Bonded single and twin pipe systems for buried hot water networks -
Part 1: Joint casing assemblies and thermal insulation for hot water networks in accordance with EN
13941-1
EN 14419, District heating pipes - Bonded single and twin pipe systems for buried hot water networks -
Surveillance systems
EN 17248:2019, District heating and district cooling pipe systems - Terms and definitions
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 17248:2019 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at http://www.iso.org/obp
— IEC Electropedia: available at http://www.electropedia.org/
4 Qualification of Test Institute, Supervisor
4.1 Test Institute
The test institute is a recognized centre for the examination of PE-welders.
NOTE The training of PE-welders can also take place at the test institute.
Test institutes can be companies that:
— manufacture factory made district heating and district cooling pipe, fitting and valve assemblies ,
— distribute factory made district heating and district cooling pipe, fitting and valve assemblies,
— carry out joint installation work on factory made bonded and flexible pipe systems for district
heating and district cooling,
who have demonstrated extensive theoretical and practical experience in joint casing installation over
a minimum period of 5 years.
or:
— institutions whose business activities include the education and examination of specialist staff,
however with additional personnel requirements, in case extensive theoretical and practical
expertise over a minimum period of 5 years cannot be demonstrated.
Factual requirements for the test institute are suitable equipment engineering, testing technology and
premises for knowledge and practical skills tests.
The application for recognition as testing institute shall be submitted in writing to the Euroheat & Power
association (EHP), followed by an examination of the required specialist knowledge of the supervisors
as well as by an inspection of the required spatial and factual infrastructure. A group of experts decides
on the award or refusal of the certificate of recognition or raises deficiencies for rectification.
The rules of procedure for the entire recognition process should be adhered to
— process of the recognition procedure
— duration of validity
— recognition of additional supervisors
— issuance, expiry or withdrawal of recognition
— monitoring
— review
— extension of the period of validity
— change of recognition
— complaints procedure
The recognition is valid for a period of 5 years. In order to maintain its recognition, the test institute
shall ensure the necessary premises, technical equipment, further training and the availability of a
recognized supervisor.
4.2 Supervisor
The qualification of a supervisor shall be:
— an engineer, bachelor, master, technician or state-recognized master craftsman respectively
master chamber of industry and commerce in a relevant technical profession;
— proving extensive theoretical and practical experience over a minimum period of 5 years in joint
casing installation as well as in the assessment of joint casing quality characteristics, in particular
in the joint casing installation processes to be tested;
— having served at least 3 observations/internships during PE-welder examinations;
— knowledgeable and experienced in PE-welding processes.
Instead of the 5 years of practical experience, the necessary skills can be demonstrated through the
following evidence:
— a valid test certificate according to this document, and
, and
— a valid test certificate according to prEN 18213-1[2]
— at least 10 days observation/internship on joint casing installation construction sites.
5 Admission to qualification
Only applicants whose training and/or previous activities show that they are likely to pass the planned
test may be admitted as a candidate.
As a rule, this is the case if one of the following is met:
— completed apprenticeship as plastics fabricator;
— at least one year experience as joint casing installation assistant, confirmed by employer’s
declaration;
— completion of both a theoretical and practical training course in preparation for the PE-welder´s
qualification test.
The applicant shall be trained in handling of isocyanate.
NOTE Further information can be found in the European REACH regulation.
The content of the training course is defined in Annex A.
6 Testing knowledge and skills
6.1 General
The candidate shall demonstrate in qualification tests his theoretical knowledge according to 6.2 and
practical skills according to 6.3.
6.2 Theoretical test
6.2.1 General
The candidate’s knowledge of the practical rules for skillful and safe working shall be evaluated in a
theoretical test.
This part of the qualification test is carried out under the supervision of the supervisor.
The candidate shall answer 20 multiple-choice questions. Filling in the questionnaire shall not exceed
one hour and be continuous without access to teaching aids.
The questions shall cover the subjects in 6.2.2.
6.2.2 Questions
The questions shall be related to the following subjects, as appropriate:
— personal protective equipment (PPE) (observe the national requirements)
— preparation of pipe trench
— storage, transport and handling of chemicals and flammable/corrosive substances
— proper installation equipment and tools
— surrounding conditions for joint casing installation
— working and ambient conditions
— systems and products to be used
— preparatory works for joint casing installation
— assembly and test of surveillance systems
— preparation of welding areas
— installation of weldable joint casing systems
— execution of hot gas welding and hot gas extrusion welding (if a qualification is intended for)
— tightness testing of the joint casing prior to thermal insulation
— production of PUR foam sample
— thermal insulation of joint casing cavity
— sealing foam and vent openings
— self-assessment possibilities of welded joint casing assembly
— awareness of health and safety requirements.
6.3 Practical test
6.3.1 General
The practical test shall be carried out under the supervision of the supervisor on a weldable joint casing
system approved in accordance with EN 489-1 and / or on a test piece according to 6.3.4.
Assembling the test piece is to be carried out following the installation instructions.
Prior to the practical test, the supervisor shall inform the candidates about the procedure of examining
and rating the individual installation steps. During the practical test, the supervisor shall not provide
any advice.
All materials and documents necessary for the practical test shall be available to the candidate.
The PE-welder himself is responsible for the personal protective and suitable installation equipment.
The PE-welder himself can decide whether to use his own tools and equipment (or those of his
employer) or those of the test centre. Unless the PE-welder uses the tools and equipment of the test
centre, separate proof shall be provided about its flawless condition, functionality and calibration.
Depending on the qualification aimed for, the PE welder shall produce a separate test piece for joint
casing systems 4.1 and 5.1 in accordance with EN 489-1 as well as for the hot gas welding and hot gas
extrusion welding processes according to 6.3.4.
The practical test shall be conducted within 120 minutes per test piece.
Subject areas of the practical test are:
— preparatory works for weldable joint casing assembly or T-piece according to 6.3.4;
— assembly of measuring elements and test of surveillance system;
— preparation of welding areas;
— handling of joint casing system;
— execution of hot gas welding and hot gas extrusion welding (if qualification is intended for);
— tightness test of joint casing, if applicable;
— handling of PUR foam
— closing of foam and vent openings, if applicable;
— visual inspection of assembled joint casing system / T-piece;
— documentation of joint casing system / T-piece installation.
6.3.2 Equipment
The equipment to be used in the practical test shall be in flawless condition, functional and calibrated.
Equipment can be the one of the candidate or of the test institute.
6.3.3 Test piece preparation and assembling of weldable joint casing system
The test piece shall be positioned above ground level similarly to the situation on site. The height of the
supports to be attached to the free ends of the steel service pipe shall be between 200 and 400 mm from
the floor to the bottom edge of the steel service pipe, see Figure 1.
The test piece shall be properly prepared for assembling of the joint casing system by the candidate.
Key
A Non-rotating pipe fixings
B Factory made pipe assembly according to EN 253
C Weldable joint casing system according to EN 489-1
D Distance between floor and bottom edge of the service pipe (200 mm to 400 mm)
E Floor
Figure 1 — Set-up of the test piece for the preparation and assembly of the joint casing system
6.3.4 Test piece preparation and assembling of T-piece for hot gas welding and hot gas
extrusion welding
A T-piece is used as the test piece. It shall be positioned above ground level similarly to the situation on
site. The height of the supports to be attached to the free ends of the steel service pipe shall be between
200 and 400 mm from the floor to the bottom edge of the steel service pipe, see Figure 2.
Further possible examples for hot gas welding and hot gas extrusion welding are shown in Annex C. If a
test piece other than shown in Figure 2 is used in the practical test, it shall be mentioned in the
Certificate.
The test piece shall be properly prepared for assembling of the casing construction by the applicant.
Key
1 Pipe assembly according to EN 253[19] with diameter casing (DC) 160 mm
2 Main pipe casing with cut-out [window] for branch-off pipe
3 Pipe assembly according to EN 253[19] with diameter casing (DC) 110 mm
4 Branch pipe casing
5 Circumferential weld seams by root pass using the hot gas welding process with or without filler material
and by cover pass using the hot gas extrusion welding process
6 Longitudinal seams as V-seam by root pass using the hot gas welding process with or without filler
material and by cover pass using the hot gas extrusion welding process
7 Ground level
8 Non-rotating pipe fixings
Figure 2 — Arrangement and dimensions of the test piece (Dimensional data [mm] as circa
dimensions)
7 Examination of skills and knowledge
The exam shall be supervised, rated and validated by the supervisor.
8 Test piece assembly
8.1 Difficulties and corrections whilst fitting the test piece
In the event of difficulties during the practical test for which the candidate is not responsible, the test
piece on which assembling has been started may be replaced provided the supervisor’s prior consent.
Errors made or occurring during the assembling may be repaired only after permission has been given
by the supervisor.
8.2 Inspection requirements
Before assembling, the supervisor shall check the identity of the candidate as well as the suitability of
the materials and equipment. The test piece shall be identified with the number or mark of the
supervisor and of the candidate.
The supervisor shall
— supervise the preparation and the assembling of the test piece.
— terminate the qualification test if the assembling is not in compliance with the manufacturer’s
instructions or the candidate does not have the skills required to obtain a satisfactory result.
— visually check the test piece after completion by the candidate.
9 Evaluation and acceptance criteria of test piece and test specimens
9.1 General
The supervisor inspects the installation documentation and evaluates the test specimen made by the
candidate.
The test has to be evaluated as follows:
— “c”: conform;
— “nc”: non-conform.
Storage or disposal of the test piece or test specimens shall be as instructed by the supervisor.
9.2 Evaluation of test piece and test specimen
9.2.1 General
Assembling of the test piece shall comply with the
— installation instructions of the joint casing system used in the practical test
— execution conditions of hot gas welding and hot gas extrusion welding.
The supervisor shall visually evaluate the correct application by accompanying the assembly of the test
piece by the candidate.
After completion of the test piece, visual inspection and destructive tests shall be performed under
supervision.
The evaluation shall be recorded in accordance with Annex B.
Mechanical-technological tests in general shall be carried out after cooling down to 20 +/-10°C.
Test piece or test specimens are stored or disposed of in accordance with the supervisor’s instructions.
9.2.2 Measuring elements
The following requirements shall be met when installing the monitoring system according to EN 14419:
— Applying the spacers
— Connecting the measuring wires
— Checking for electrical continuity
— Testing for electrical circuit
— Measuring the electrical insulation resistance
— Evaluate the measured values of electrical circuit and electrical insulation resistance
9.2.3 Visual inspection of processed welded joint casing system
— Joint casing is centred over the joint, evenly installed without overheating and firmly resting
against the casing (no upstanding edges)
— There shall be visible marks in the welded zones where pressure bands have been p
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.
Loading comments...