EN 17970:2024

SLOVENSKI STANDARD
oSIST prEN 17970:2023
01-maj-2023
Cevi iz duktilne železove litine - Spoji za cevne sisteme iz duktilne železove litine -
Odpornost proti vraščanju korenin - Zahteve in preskusne metode
Ductile iron pipes - Push-in joints for ductile iron pipe systems - Resistance against root
intrusion - Requirements and test methods
Rohre aus duktilem Gusseisen und ihre Verbindungen - Widerstandsfähigkeit gegen
Wurzeleinwuchs
Ta slovenski standard je istoveten z: prEN 17970
ICS:
23.040.10 Železne in jeklene cevi Iron and steel pipes
oSIST prEN 17970:2023 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

oSIST prEN 17970:2023
oSIST prEN 17970:2023
DRAFT
EUROPEAN STANDARD
prEN 17970
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2023
ICS
English Version
Ductile iron pipes - Push-in joints for ductile iron pipe
systems - Resistance against root intrusion - Requirements
and test methods
Rohre aus duktilem Gusseisen und ihre Verbindungen -
Widerstandsfähigkeit gegen Wurzeleinwuchs
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, 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
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 17970:2023 E
worldwide for CEN national Members.

oSIST prEN 17970:2023
prEN 17970:2023 (E)
Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Requirements . 5
5 Test method . 5
Annex A (informative) Influences on the resistance against root intrusion of assembled pipe
joints . 9
Bibliography . 10

oSIST prEN 17970:2023
prEN 17970:2023 (E)
European foreword
This document (prEN 17970:2023) has been prepared by Technical Committee CEN/TC 203 “Cast
iron pipes and fittings”, the secretariat of which is held by AFNOR.
This document is currently submitted to the CEN Enquiry.

oSIST prEN 17970:2023
prEN 17970:2023 (E)
Introduction
The test described in this document is adjusted from a standardized test method for plastic pipes
to the characteristics of push-in joints for ductile iron pipe systems.
The undesired penetration of tree roots into push-in joints
— causes obstacles to flow with the resulting risks of blockages and backing-up;
— causes leakage in sewage systems with the hazards to the soil and groundwater which this
entails;
— leads to high, recurring costs for root removal;
— needs the replacement or renovation of the section of sewage or drainage system affected
necessary.
In this case, even after replacement or renovation, the cause often remains in effect – namely the
close proximity of the tree with the route of the drainage and sewage system. Therefore,
root-resistant pipe systems should be used when laying new drainage and sewage systems and
replacing existing ones.
oSIST prEN 17970:2023
prEN 17970:2023 (E)
1 Scope
This document is applicable to diffusion-tight pipes, accessories and fittings in ductile cast iron to
EN 598 and to cast iron pipe systems.
The document gives requirements on the contact pressure based on a risk assessment and gives
a test method that simulates the penetration of a root tip into the sealing gap.
2 Normative references
EN 598:2007+A1:2009, Ductile iron pipes, fittings, accessories and their joints for sewerage
applications — Requirements and test methods
3 Terms and definitions
No terms and definitions are listed in this document.
4 Requirements
When tested according to 5.3 and evaluated according to 5.4 the contact pressure between the
sealing surfaces of socket and spigot end shall be as described in Table 1:
Table 1 — Requirements for the contact pressure based on a risk assessment
Minimum
Contact pressure
Risk assessment
[bar]
1 If ductile iron pipelines are installed away from trees and a distance is
maintained that makes the chance of contact between tree roots and the
pipeline appear remote, a low risk of root penetration can be assumed.
The risk of ingrowth can be reduced by further extensive protective 2
measures. These include both measures in the pipeline trench (passive
protective measures) and measures directly at the construction site
(active protective measures), as described in DVGW GW 125.
2 When ductile iron pipelines are install
...