SIST EN 805:2025

SLOVENSKI STANDARD
01-april-2025
Oskrba z vodo - Zahteve za zunanje vodovode in dele
Water supply - Requirements for systems and components outside buildings
Wasserversorgung - Anforderungen an Wasserversorgungssysteme und deren Bauteile
außerhalb von Gebäuden
Alimentation en eau - Exigences pour les réseaux extérieurs aux bâtiments et leurs
composants
Ta slovenski standard je istoveten z: EN 805:2025
ICS:
93.025 Zunanji sistemi za prevajanje External water conveyance
vode systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 805
EUROPEAN STANDARD
NORME EUROPÉENNE
February 2025
EUROPÄISCHE NORM
ICS 93.025 Supersedes EN 805:2000
English Version
Water supply - Requirements for systems and components
outside buildings
Alimentation en eau - Exigences pour les réseaux Wasserversorgung - Anforderungen an
extérieurs aux bâtiments et leurs composants Wasserversorgungssysteme und deren Bauteile
außerhalb von Gebäuden
This European Standard was approved by CEN on 29 December 2024.

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, Türkiye 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
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 805:2025 E
worldwide for CEN national Members.

Contents Page
European foreword . 7
Introduction . 8
1 Scope . 9
2 Normative references . 9
3 Terms and definitions .10
3.1 General .10
3.2 System .11
3.3 Components .14
3.4 Diameters .16
3.5 Installation .16
3.6 Hydraulic design .18
3.7 Structural design .18
4 Requirements for water supply systems .19
4.1 Water quality and regulatory framework .19
4.1.1 General .19
4.1.2 Materials .19
4.1.3 Prevention of back flow .19
4.1.4 Stagnation .19
4.1.5 Cross-connections with other systems .19
4.1.6 Contaminated soil .20
4.2 Planning horizon for water supply systems .20
4.3 Demand for water .20
4.3.1 Water demand estimates .20
4.3.2 Water for firefighting .20
4.4 System hazards and security.20
5 Service levels .21
6 Rehabilitation .21
7 Design .21
7.1 Design objectives .21
7.2 Peak flow factors .21
7.3 Hydraulic design .21
7.3.1 Sizing .21
7.3.2 Hydraulic calculations .22
7.3.3 Hydraulic roughness value .23
7.3.4 Flow velocities .23
7.3.5 Network analysis .23
7.3.6 Local mains .23
7.3.7 Service pipes .23
7.4 Structural design .24
7.4.1 General .24
7.4.2 Internal forces .24
7.4.3 External forces .24
7.4.4 Temperature range .24
7.4.5 Unbalanced thrust .24
7.4.6 Design requirements .24

7.4.7 Hydrostatic design requirements . 25
7.4.8 Unforeseen ground conditions . 26
7.5 System layout . 26
7.5.1 Mains . 26
7.5.2 Types of system configurations . 27
7.5.3 Service pipes . 27
7.5.4 Valves . 27
7.5.5 Surge limiting equipment . 28
7.6 Protection against aggressive environment . 28
7.7 Reservoirs . 28
7.8 Pumping stations . 28
7.9 Design service life . 28
7.10 Documentation . 29
8 General requirements for products . 29
8.1 General . 29
8.2 Materials . 29
8.3 Dimensions . 29
8.3.1 Nominal sizes . 29
8.3.2 Internal diameters . 29
8.3.3 Length and wall thickness . 30
8.3.4 Geometry of pipes, fittings, and valves . 30
8.3.5 Internal surface . 30
8.3.6 Appearance and soundness . 30
8.4 Structural design. 30
8.5 Mechanical requirements . 31
8.5.1 Circumferential resistance . 31
8.5.2 Longitudinal resistance . 31
8.6 Water tightness . 31
8.7 Joints. 31
8.7.1 General . 31
8.7.2 Rigid joints . 32
8.7.3 Adjustable joints . 32
8.7.4 Flexible joints . 32
8.8 Protective measures . 32
8.9 Durability . 32
8.10 Test methods . 32
8.10.1 General . 32
8.10.2 Measurement of diameter and wall thickness . 32
8.10.3 Measurement of deviation from straightness of barrel . 33
8.10.4 Measurement of deviation from squareness of component ends . 33
8.10.5 Longitudinal resistance test for pipes . 33
8.10.6 Crushing test for pipes with rigid behaviour . 33
8.10.7 Ring stiffness test for pipes with flexible behaviour . 34
8.10.8 Pressure tests . 34
8.11 Interconnection of products . 34
8.12 Quality management . 34
8.13 Marking . 34
9 Installation . 35
9.1 General requirements . 35
9.1.1 Qualifications . 35
9.1.2 Rules for the execution of construction work . 35
9.1.3 Transport and storage of pipeline components . 35
9.1.4 Health and safety . 35
9.2 Pipe trenches . 36
9.2.1 Construction of pipe trenches; working space .36
9.2.2 Depth of cover .36
9.2.3 Bedding .36
9.3 Installation of pipeline components .37
9.3.1 Distances from underground installations .37
9.3.2 Protection of pipelines against contamination .37
9.3.3 Installation of valves, fittings and other components.37
9.3.4 Connection to structures .37
9.3.5 Precautions against flotation .38
9.4 Pipe joints .38
9.4.1 General requirements .38
9.4.2 Unrestrained joints .38
9.4.3 Restrained joints .38
9.4.4 Welded joints .38
9.4.5 Lubricants for joints .38
9.5 Protection against corrosion and contamination.38
9.5.1 External protection .38
9.5.2 Internal protection .39
9.6 Embedment and main backfill.39
9.6.1 General .39
9.6.2 Selected material for the embedment .39
9.6.3 Execution of the embedment .39
9.6.4 Execution of the main backfill .40
9.6.5 Control of the degree of compaction .40
9.6.6 Diametral deflection of flexible pipes after installation .40
9.7 Records of tests during installation .40
10 Testing of pipelines .40
10.1 General .40
10.2 Safety .41
10.2.1 Safety Equipment and clothing .41
10.2.2 Excavations .41
10.2.3 Filling and testing .41
10.3 Pressure test .41
10.3.1 Preparations .41
10.3.2 Test pressure .42
10.3.3 Installation point for testing equipment .43
10.3.4 Testing at operating pressure with visual inspection .43
10.4 Testing procedure .43
10.4.1 General requirements .43
10.4.2 Preliminary test .43
10.4.3 Pressure drop test.44
10.4.4 Main pressure test .44
10.4.5 Depressurization .45
10.4.6 Test evaluation .45
10.4.7 Final system test .45
10.4.8 Recording test results .45
11 Preparation for commissioning .45
11.1 General .45
11.2 Preparation for disinfection.45
11.2.1 General requirements .45
11.2.2 Disinfection equipment .46
11.3 Selection of disinfectant .46
11.4 Disinfection procedures .46
11.4.1 General requirements .46
11.4.2 Static procedure . 46
11.4.3 Dynamic procedure . 46
11.4.4 Disposal of disinfectant . 46
11.5 Microbiological clearance and reporting . 46
12 Additional requirements . 47
13 Operation . 47
13.1 Inspection and monitoring . 47
13.2 Maintenance . 48
14 Updating of the documentation . 48
Annex A (informative) Guidance to EN 805 . 49
A.1 General . 49
A.2 Pressures . 49
A.3 Prevention of back siphonage . 50
A.4 Water demand estimates . 50
A.5 Water for firefighting . 50
A.6 Service objectives . 51
A.7 Peak flow factors . 51
A.8 Sizing . 51
A.9 Hydraulic roughness value. 51
A.10 Flow velocities . 52
A.11 Network analysis . 52
A.12 Local mains . 53
A.13 Mains . 53
A.14 Types of system configuration . 54

A.15 Service pipes . 55
A.16 Entry and release of air . 55
A.17 Draining . 56
A.18 Isolation . 56
A.19 Hydrants . 56
A.20 Protection against aggressive environment . 56
A.21 Pumping stations . 57
A.22 Structural design. 57
A.23 Testing of non-viscoelastic pipelines (metals, concrete, GRP) . 59
A.23.1 General . 59
A.23.2 Safety . 60
A.23.3 Preparation of a test section . 60
A.23.4 Pressure testing procedure . 64
A.23.5 Finalization of testing . 69
A.24 Testing of viscoelastic pipelines (PE, PVC-U, PVC-O) . 70
A.24.1 General .70
A.24.2 Safety .70
A.24.3 Preparation of a test section .71
A.24.4 Pressure testing procedures .73
A.24.5 Testing procedure using the contraction method .76
A.24.6 Testing procedure using the normal method .81
A.24.7 Finalization of testing .85
A.25 Selection of disinfectants .85
Bibliography .86

European foreword
This document (EN 805:2025) has been prepared by Technical Committee CEN/TC 164 “Water supply”, 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 August 2025, and conflicting national standards shall be withdrawn
at the latest by August 2025.
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 805:2000.
The main changes compared to the previous edition EN 805:2000 are listed below:
— addressing climate change and circular economy to enable improvements of water supply systems;
— addressing innovation in new products, processes and solutions for water supply systems;
— improvements related to the long-term safety, planning horizons and the resilience of the water supply
systems;
— new subclause A.23 “Testing of non-viscoelastic pipelines (metals, concrete, GRP)” added;
— subclause A.24 “Testing of viscoelastic pipelines (PE, PVC-U, PVC-O)”: improved procedures.
Any feedback and questions on this document should be directed to the users’ national standards body. A
complete listing of these bodies can be found on the CEN website.
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, Türkiye and the United Kingdom.

Introduction
In specifying the requirements of this document, due regard has been taken of the importance of a reliable and
safe supply of water for human consumption without excluding other uses of the water from the supply
system.
The widely varying water supply legislative requirements, populations, social and climatic conditions across
Europe have also been taken into account.
This document does not make any implication with regard to ownership of or responsibility for pipes or other
apparatus in the supply system.
This document takes into account the EU Strategy on Standardization setting global standards in support of a
sustainable, resilient, green and digital EU single market.
Technical experts have reviewed and refreshed all the clauses of the EN 805:2000 revision to bring this
document up to date in particular the implications of climate change and adapting the water supply systems,
security, pressure testing, record keeping, resilience of water supply and updates as a result of many
constructive comments from active users of this document across Europe.
It is presupposed that the users of this document take into account any applicable laws, regulations, directives
and standards, including those on health and safety.

1 Scope
This document specifies:
— general requirements for water supply systems outside buildings including potable water mains and
service pipes, service reservoirs, other facilities and raw water mains but excluding treatment works and
water resources development;
— general requirements for components;
— general requirements for inclusion in product standards which can include specifications which are more
stringent;
— general requirements for installation, site testing and commissioning.
The requirements of this document apply to:
— the design and construction of new water supply systems;
— the extension of significant areas forming a coherent part of an existing water supply system;
— interconnections between water supply systems;
— significant modification and/or rehabilitation of existing water supply systems.
NOTE It is not intended that existing water supply systems are altered to comply with this document, provided that
there are no significant detrimental effects on water quantity, security, reliability and adequacy of the supply. However,
this document is intended to cover all water infrastructure systems mentioned above since they are key to meet the
sustainable goals of the cities and to show the urgent need to invest in them in order to consider fundamental aspects,
such as resilience or mitigation/adaptation to climate change.
2 Normative references
The following documents are referenced in the text in such a way that some parts of these or their entire
contents constitute requirements of this document. With dated references, only the referenced issue is
applicable. With undated references, the last issue of the referenced document is applicable (including all
changes).
EN 1295-1, Structural design of buried pipelines under various conditions of loading — Part 1: General
requirements
EN 1508, Water supply — Requirements for systems and components for the storage of water
ISO 48, Rubber, vulcanized or thermoplastic — Determination of hardness (hardness between 10 IRHD and 100
IRHD)
3 Terms and definitions
For the purposes of this document, the following definitions 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/
3.1 General
3.1.1
allowable maximum operating pressure
PMA
maximum pressure occurring from time to time, including surge, that a component is capable of withstanding
in service
3.1.2
allowable operating pressure
PFA
maximum hydrostatic pressure that a component is capable of withstanding continuously in service
3.1.3
allowable site test pressure
PEA
maximum hydrostatic pressure that a newly installed component is capable of withstanding for a relatively
short duration, in order to ensure the integrity and tightness of the pipeline
3.1.4
design pressure
DP
maximum operating pressure of the system or of the pressure zone fixed by the designer considering future
developments but excluding surge
3.1.5
maximum design pressure
MDP
maximum operating pressure of the system or of the pressure zone fixed by the designer considering future
developments and including surge
3.1.5.1
MDPa
designation of MDP when there is a fixed allowance for surge
3.1.5.2
MDPc
designation of MDP when the surge is calculated
3.1.6
operating pressure
OP
internal pressure which occurs at a particular time and at a particular point in the water supply system
3.1.7
pressure zones
areas of pressure ranges within a water supply system
3.1.8
service pressure
SP
internal pressure delivered at the point of connection to the consumer’s installation at zero flow in the service
pipe
3.1.9
surge
rapid fluctuations of pressure caused by flow alterations over short periods of time
3.1.10
system test pressure
STP
hydrostatic pressure applied to a newly laid pipeline in order to ensure its integrity and tightness
3.2 System
3.2.1
gravity system
system where flow and/or pressure are caused by the force of gravity
Note 1 to entry: There are two kinds of such systems:
— pressurized gravity system, where the pipeline operates full;
— non-pressurized gravity system, where the pipeline operates partially full.
3.2.2
local main
water main which connects principal main(s) with service pipes
3.2.3
potable water
water intended for human consumption as defined by the relevant national authorities
3.2.4
principal main
water main serving as a principal distributor within the supply area, normally without direct consumer
connections
3.2.5
pumped and gravity system
system where the gravity system and the pumped system are used, either separately or in combination, to
provide the flow and/or pressure
3.2.6
pumping station
pumping installation designed to provide pressure and flow within the distribution system
Note 1 to entry: Three types can be distinguished (see Figure 1):
— main lift normally at the outlet of the treatment works, or source if there is no treatment, to provide flow to
the service reservoir;
— intermediate to deliver flow on the way to a service reservoir or supply area;
— booster to pump directly from and to the area without storage.

Key
1 main lift
2 intermediate
3 booster
Figure 1 — Example of different types of pumping stations
3.2.7
pumped system
system where flow and pressure are provided by means of one or more pumps and where the pipeline
operates full
3.2.8
reservoir
storage facility for water
3.2.9
service pipe
water pipe which supplies water from the local main to the consumer
3.2.10
service reservoir
covered r
...