oSIST prEN 295-8:2025

SLOVENSKI STANDARD
01-december-2025
Keramični cevni sistemi za odvod odpadne vode in kanalizacijo - 8. del: Zahteve za
uporabo keramičnih komponent pri sanaciji odtočnih sistemov in pogoji za
uporabo metod sanacije v obstoječih odtočnih sistemih
Vitrified clay pipe systems for drains and sewers - Part 8: Requirements for the use of
vitrified clay components in the rehabilitation of drainage systems and conditions for the
application of methods for rehabilitation in existing drainage systems
Steinzeugrohrsysteme für Abwasserleitungen und -kanäle - Teil 8: Anforderungen an die
Verwendung von Steinzeugkomponenten bei der Sanierung von
Entwässerungssystemen und Bedingungen für die Anwendung von Sanierungsverfahren
in bestehenden Entwässerungssystemen
Systèmes de tuyaux en grès vitrifié pour les collecteurs d’assainissement et les
branchements - Partie 8 : Exigences applicables à l’utilisation de composants en grès
vitrifié dans le cadre de la réhabilitation des systèmes d’évacuation et aux conditions
d’application des méthodes de réhabilitation dans les systèmes d’évacuation existants
Ta slovenski standard je istoveten z: prEN 295-8
ICS:
23.040.50 Cevi in fitingi iz drugih Pipes and fittings of other
materialov materials
91.140.80 Drenažni sistemi Drainage systems
93.030 Zunanji sistemi za odpadno External sewage systems
vodo
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2025
ICS 23.040.05; 23.040.50
English Version
Vitrified clay pipe systems for drains and sewers - Part 8:
Requirements for the use of vitrified clay components in
the rehabilitation of drainage systems and conditions for
the application of methods for rehabilitation in existing
drainage systems
Systèmes de tuyaux et accessoires en grès vitrifié pour Steinzeugrohrsysteme für Abwasserleitungen und -
les collecteurs et branchements d'assainissement - kanäle - Teil 8: Anforderungen an die Verwendung von
Partie 8: Exigences relatives à l'utilisation de Steinzeugkomponenten bei der Sanierung von
composants en grès vitrifié dans le cadre de la Entwässerungssystemen und Bedingungen für die
réhabilitation des systèmes d'évacuation et aux Anwendung von Sanierungsverfahren in bestehenden
conditions d'application des méthodes de Entwässerungssystemen
réhabilitation dans les systèmes d'évacuation existants
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 165.
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 295-8:2025 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Abbreviations . 5
5 Methods and requirements for the rehabilitation of sewers and sewage buildings in open
and closed construction methods . 5
5.1 General requirements for vitrified clay . 5
5.2 Replacement method in open construction . 6
5.2.1 General. 6
5.2.2 Replacement (from manhole to manhole). 8
5.2.3 Replacement of manholes according to EN 1610 . 8
5.3 Rehabilitation methods using the closed construction method . 9
5.3.1 Pipe-eating . 9
5.3.2 Pipe bursting . 12
5.3.3 Heading method . 13
5.4 Renovation methods . 15
5.4.1 Single pipe lining . 15
5.4.2 Replacements of joints with robotic methods . 16
5.5 Repair methods for vitrified clay pipes . 18
5.5.1 Repair using the open trench method . 18
Annex A (informative) Overview of rehabilitation methods, installation techniques, pipe type
and sealing materials . 20
Bibliography . 21

European foreword
This document (prEN 295-8:2025) has been prepared by Technical Committee CEN/TC 165 “Waste
water engineering”, the secretariat of which is held by DIN.
This document is currently submitted to the CEN Enquiry.
EN 295 “Vitrified clay pipe systems for drains and sewers” consists of the following parts:
— Part 1: Requirements for pipes, fittings and joints
— Part 2: Evaluation of conformity and sampling
— Part 3: Test methods
— Part 4: Requirements for adaptors, connectors and flexible couplings
— Part 5: Requirements for perforated pipes and fittings
— Part 6: Requirements for components of manholes and inspection chambers
— Part 7: Requirements for pipes and joints for pipe jacking
Introduction
The existing and developing standards for renovation and replacement take insufficient account of the
use of vitrified clay pipes and fittings or are directly related to other materials. The necessary work in
existing sewer systems has been known for many years and standards for products are to be geared to
such applications and requirements. The content of EN 295 is therefore to be revised and supplemented
by a Part 8. The vitrified clay components according to EN 295 are manufactured in the factory and are
thus subject to the EN 295 series. They do not change because of installation. The areas of application
have developed further since the first edition of this document. For the guiding use of the components,
the installation conditions are also to be defined or the conditions from the installation technology are
to be specified. In particular, the use of trenchless technologies and the components required for them
have developed further.
1 Scope
This document specifies areas of application for vitrified clay components used for the rehabilitation of
sewers with the technologies for replacement, renovation and repair in open and closed construction,
including the associated tests.
This document is applicable in:
— sewers and constructions; not accessible and accessible;
— in relation to existing vitrified clay pipe systems; but also, applications in systems made of other
materials;
— reconstruction of sewers in systems;
— non-pressure systems.
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 295 (all parts), Vitrified clay pipe systems for drains and sewers
EN 1610, Construction and testing of drains and sewers
EN 15885, Classification and characteristics of techniques for renovation, repair and replacement of
drains and sewers
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 295 series, EN 1610, EN 15885
and EN 12889 apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
4 Abbreviations
Abbreviations: see EN 295 series, EN 1610, EN 15885 and EN 12889.
5 Methods and requirements for the rehabilitation of sewers and sewage
buildings in open and closed construction methods
5.1 General requirements for vitrified clay
The following clauses describe essential requirements related to the application of vitrified clay
components with process-related requirements, such as bending-resistant of components, flexibility via
joints, prefabrication of the components in the factory and is open for further methods in the
application.
The individual methods are described in Table 1 to Table 8 with regard to characteristics and
requirements. An additional overview is provided in Annex A.
5.2 Replacement method in open construction
5.2.1 General
The replacement in open construction is in accordance with EN 1610 (see Figure 1). The replacement of
components in open construction is not described in EN 1610. The vitrified clay components used and
the necessary connections are standardized. The case of renovation requires further information. The
technical requirements are the same as for open construction and include:
— static stresses;
— connections and their stresses;
— tightness tests.
Key
1 surface
2 bottom of road or railway construction, if any
3 trench walls
4 main backfill (EN 1610:2015, 3.6)
5 initial backfill (EN 1610:2015, 3.5)
6 sidefill (EN 1610:2015, 3.12)
7 upper bedding
8 lower bedding
9 trench bottom
10 depth of cover (EN 1610:2015, 3.3)
11 depth of bedding (EN 1610:2015, 3.1)
12 depth of embedment (EN 1610:2015, 3.4)
13 trench depth (EN 1610:2015, 3.13)
a depth of lower bedding
b depth of upper bedding
c depth of initial backfill
b = k x OD (see EN 1610:2015, Clause 7)
where
k is a dimensionless factor relating the upper bedding thickness, b, to OD;
OD is the outside diameter of pipe in mm.
NOTE 1 For minimum values of a and c see EN 1610:2015, Clause 7.
NOTE 2 k x OD replaces the designation of bedding angle in some existing national standards. The bedding
angle is not the bedding reaction angle used in structural design.
Figure 1 — Definitions (Source EN 1610:2015, Figure 1)
5.2.2 Replacement (from manhole to manhole)
The following Table 1 provides requirements and essential characteristics for the replacement of
vitrified clay pipes and components (from manhole to manhole).
Table 1 — Characteristics of vitrified clay pipes for replacement from manhole to manhole-
components and application features
Requirements Application Standard
Application according to EN 1610
Product according to EN 295-1
Component-types Vitrified clay pipes, fittings and components according to
EN 295-1, EN 295-4 and EN 295-7
Essential characteristics Remarks
Appl
...