Sanitary appliances - Drainage systems for the application of sanitary appliances

This document describes the installation rules that must be followed to ensure proper functioning of the drainage system depending on the specified performance of the sanitary appliances.
These performance characteristics of sanitary appliances (defined in the harmonized standards EN 997, EN 13407, EN 14688, EN 14528 and EN 14527) are explained and brought into line with the application rules of standard series EN 12056.
According to Regulation (EU) 305/2011, legally binding information on building requirements must be provided by the National Product Information Point. Therefore, additional national requirements are mentioned informatively where information is available.

Sanitärausstattungsgegenstände - Entwässerungssysteme für den Einsatz von Sanitärausstattungsgegenstände

Appareils sanitaires - Systèmes de drainage pour l'application des appareils sanitaires

Le présent document décrit les règles d’installation qu’il convient de suivre pour assurer le bon fonctionnement des systèmes d’évacuation, selon les performances spécifiées des appareils sanitaires.
Ces caractéristiques de performance des appareils sanitaires (définies dans les normes harmonisées EN 997, EN 13407, EN 14688, EN 14528 et EN 14527) sont expliquées et mises en conformité avec les règles d’application de la série de normes EN 12056.
Selon le Règlement (UE) 305/2011, les informations juridiquement contraignantes sur les exigences de construction doivent être fournies par le point de contact produit national. Par conséquent, des exigences nationales supplémentaires sont mentionnées à titre informatif, lorsque les informations sont disponibles.

Sanitarne naprave - Sistemi za odvajanje odpadne vode iz sanitarnih naprav

Ta dokument opisuje pravila za vgradnjo, ki jih je treba upoštevati, da se zagotovi pravilno delovanje sistema za odvajanje odpadne vode glede na določeno delovanje sanitarnih naprav.
Te lastnosti delovanja sanitarnih naprav (določene v usklajenih standardih EN 997, EN 13407, EN 14688, EN 14528 in EN 14527) so pojasnjene in usklajene s pravili za uporabo iz skupine standardov EN 12056.
V skladu z Direktivo (EU) 305/2011 mora nacionalna informativna točka za proizvode zagotoviti pravno zavezujoče informacije o gradbenih zahtevah. Zato so dodatne nacionalne zahteve omenjene informativno, kadar so informacije na voljo.

General Information

Status
Published
Public Enquiry End Date
04-Sep-2019
Publication Date
06-Nov-2019
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
23-Oct-2019
Due Date
28-Dec-2019
Completion Date
07-Nov-2019

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SLOVENSKI STANDARD
SIST-TP CEN/TR 17426:2019
01-december-2019
Sanitarne naprave - Sistemi za odvajanje odpadne vode iz sanitarnih naprav

Sanitary appliances - Drainage systems for the application of sanitary appliances

Sanitärausstattungsgegenstände - Entwässerungssysteme für den Einsatz von
Sanitärausstattungsgegenstände

Appareils sanitaires - Systèmes de drainage pour l'application des appareils sanitaires

Ta slovenski standard je istoveten z: CEN/TR 17426:2019
ICS:
91.140.70 Sanitarne naprave Sanitary installations
91.140.80 Drenažni sistemi Drainage systems
SIST-TP CEN/TR 17426:2019 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST-TP CEN/TR 17426:2019
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SIST-TP CEN/TR 17426:2019
CEN/TR 17426
TECHNICAL REPORT
RAPPORT TECHNIQUE
October 2019
TECHNISCHER BERICHT
ICS 91.140.70; 91.140.80
English Version
Sanitary appliances - Drainage systems for the application
of sanitary appliances

Appareils sanitaires - Systèmes d'évacuation pour Sanitärausstattungsgegenstände -

l'application des appareils sanitaires Entwässerungssysteme für den Einsatz von
Sanitärausstattungsgegenstände

This Technical Report was approved by CEN on 16 September 2019. It has been drawn up by the Technical Committee CEN/TC

163.

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

© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TR 17426:2019 E

worldwide for CEN national Members.
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SIST-TP CEN/TR 17426:2019
CEN/TR 17426:2019 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

Introduction .................................................................................................................................................................... 4

1 Scope .................................................................................................................................................................... 5

2 Normative references .................................................................................................................................... 5

3 Terms and definitions ................................................................................................................................... 5

4 Drinking water installation ......................................................................................................................... 5

5 The drainage system ...................................................................................................................................... 6

5.1 Types of sewage water: black water and rain water .......................................................................... 6

5.2 Types of building drainage system: separate sewerage system and combined

sewerage system ............................................................................................................................................. 6

5.3 Drainage system: design and dimensioning .......................................................................................... 6

5.4 Basis for drainage systems .......................................................................................................................... 7

6 Types of drainage systems ........................................................................................................................... 7

6.1 General ................................................................................................................................................................ 7

6.2 System I: Single discharge stack system with partly filled branch discharge pipes ............... 7

6.3 System II: Single discharge stack system with small bore discharge branch pipes ................ 7

6.4 System III: Single discharge stack system with full bore branch discharge pipes ................... 7

6.5 System IV: Separate discharge stack system ......................................................................................... 7

6.6 Area of application.......................................................................................................................................... 7

7 Sanitary appliance .......................................................................................................................................... 8

8 Product standards .......................................................................................................................................... 8

8.1 General ................................................................................................................................................................ 8

8.2 EN 997 — WCs .................................................................................................................................................. 8

8.3 EN 13407 — urinals ..................................................................................................................................... 10

8.4 EN 14688 — Wash basins and EN 14528 — Bidets .......................................................................... 12

8.5 Shower trays — EN 14527 ......................................................................................................................... 13

8.6 Characteristics of any other sanitary appliances according the drainage system ............... 13

9 Summary ......................................................................................................................................................... 13

Annex A (informative) Use of drainage systems in Europe ........................................................................ 14

Annex B (informative) Special national rules ................................................................................................. 17

Annex C (informative) National product information point ...................................................................... 19

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SIST-TP CEN/TR 17426:2019
CEN/TR 17426:2019 (E)
European foreword

This document (CEN/TR 17426:2019) has been prepared by Technical Committee CEN/TC 163

“Sanitary appliances”, the secretariat of which is held by UNI.

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.

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SIST-TP CEN/TR 17426:2019
CEN/TR 17426:2019 (E)
Introduction

Sewerage disposal is a very important task of building services engineering because of hygienic reasons.

The piping must drain waste water and rain water out of the building and lead it way from the building

safe. Blockages must be avoided by proper design of the drainage system as well as the use of the

appropriate selection of the sanitary appliances.

On one hand, harmonized European standards exist for a lot of sanitary appliances to be installed as a

part of the drainage system. On the other hand, some links and requirements disappeared or went out

of sight during the phase of harmonization.

This paper should close this gap and gives additional information on application conditions for sanitary

appliances to avoid malfunction of the drainage system.
It is not intended to give guidance on the system standards like EN 12056.
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SIST-TP CEN/TR 17426:2019
CEN/TR 17426:2019 (E)
1 Scope

This document describes the installation rules that must be followed to ensure proper functioning of

the drainage system depending on the specified performance of the sanitary appliances.

These performance characteristics of sanitary appliances (defined in the harmonized standards EN 997,

EN 13407, EN 14688, EN 14528 and EN 14527) are explained and brought into line with the application

rules of standard series EN 12056.

According to Regulation (EU) 305/2011, legally binding information on building requirements must be

provided by the National Product Information Point. Therefore, additional national requirements are

mentioned informatively where information is available.
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 12056 (all parts), Gravity drainage systems inside buildings
EN 997, WC pans and WC suites with integral trap
EN 13407, Wall-hung urinals — Functional requirements and test methods
EN 14527, Shower trays for domestic purposes
EN 14528, Bidets — Functional requirements and test methods

EN 14688, Sanitary appliances — Wash basins — Functional requirements and test methods

EN 1717, Protection against pollution of potable water in water installations and general requirements of

devices to prevent pollution by backflow
EN 274 (all parts), Waste fittings for sanitary appliances
3 Terms and definitions
No terms and definitions are listed in this document.

ISO and IEC maintain terminological 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 Drinking water installation

When choosing sanitary appliances, the rules for drinking water protection have to be taken into

account as well. Such rules are defined, e.g. in EN 1717 and the corresponding product standards in case

the product is concerned. Guidance will be given in this document.
Special aspects of national legislation have to be taken into account.
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SIST-TP CEN/TR 17426:2019
CEN/TR 17426:2019 (E)
5 The drainage system
5.1 Types of sewage water: black water and rain water

Waste water or black water consists out of all sewage water from kitchen, bathroom, lavatory and other

facilities.
The source of rain water is the roof drainage and other paved areas.

In case black water and rain water will be mixed, it is called combined waste water.

5.2 Types of building drainage system: separate sewerage system and combined
sewerage system

For the discharge of wastewater inside buildings, several pipings from the sanitary appliances to the

connecting piping, the connecting sewer and finally to the public sewage water system are used.

Separate sewerage system means the two piping’s, one for rain water and one for waste water. It´s not

allowed using the waste water piping for rain water.

The size of the piping for waste water has to be calculated according to the amount of waste water

linked to the sanitary appliances.

In case of a combined sewerage system, both types of sewage piping should be connected at the

connecting piping or the connecting sewer only. It is recommended to do so as close as possible to the

public sewage water system.
5.3 Drainage system: design and dimensioning

Design and dimensioning of the drainage system inside buildings is very important. It has to be taken

into account:
— minimum slope,
— minimum flow rate,
— filling level, and
— ventilation
of the drainage system.

Only in case all aspects are respected properly the function of the drainage system is warranted, i.e.

solids can be flushed out sufficient with the first flush and transported later on.

Wrong dimensioning will lead to failures such as:

— in case of too small pipes: the waste water system is not capable to take the complete waste water

and also ventilation. This means: blockage occurs;

— in case of too big pipes: solid waste will not be transported sufficiently. Blockages will occur.

Pouring down more water in the drain is not the solution.
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CEN/TR 17426:2019 (E)
5.4 Basis for drainage systems

Basic standard for drainage systems in Europe is the series of standards EN 12056 (Gravity drainage

systems inside buildings) consisting of:
— Part 1: General and performance requirements
— Part 2: Sanitary pipework, layout and calculation
— Part 3: Roof drainage, layout and calculation
— Part 4: Wastewater lifting plants. Layout and calculation

— Part 5: Installation and testing, instructions for operation, maintenance and use

The EN 12056 series has to be understood as a basic standard to be used as a European frame work.

Additional national rules have to be taken into account. Special aspects of national legislation may

overrule certain requirements of EN 12056.

If a reference to EN 12056 is made in the following, this refers to the series of the standard with all

parts.
6 Types of drainage systems
6.1 General

Different types of drainage system are installed all over Europe. Variations are based on differing types

of sanitary appliances, history of the installation and technical habits of building.

EN 12056 defines four types of drainage systems, which mainly differ in terms of allowed filling level in

the connecting pipes.

6.2 System I: Single discharge stack system with partly filled branch discharge pipes

Sanitary appliances are connected to partly filled branch discharge pipes. The partly filled branch

discharge pipes are designed with a filling degree of 0,5 (50 %) and are connected to a single discharge

stack.

6.3 System II: Single discharge stack system with small bore discharge branch pipes

Sanitary appliances are connected to small bore branch discharge pipes. The small bore branch

discharge pipes are designed with a filling degree of 0,7 (70 %) and are connected to a single discharge

stack.

6.4 System III: Single discharge stack system with full bore branch discharge pipes

Sanitary appliances are connected to full bore branch discharge pipes. The full bore branch discharge

pipes are designed with a filling degree of 1,0 (100 %) and each branch discharge pipe is separately

connected to a single discharge stack.
6.5 System IV: Separate discharge stack system

Drainage systems Type I, II and III may also be divided into a black water stack serving WC’s and urinals

and a grey water stack serving all other appliances.
6.6 Area of application
In Annex A is shown the use of the drainage system by country.
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SIST-TP CEN/TR 17426:2019
CEN/TR 17426:2019 (E)
7 Sanitary appliance

The main purpose of sanitary appliances is personal hygiene. For this they are designed to receive

water and to lead the water into the drainages system completely.

Each sanitary appliance delivers water with a specific flow rate (design unit [l/s]) to the drainage

system. To allow a proper calculation and dimensioning of the pipes, the calculation values for sanitary

appliances are described in detail in EN 12056.

For a proper function according to the rules of EN 12056, in product standards various types and

subtypes are described including their underlying characteristics and test procedures.

Hence it is necessary to take into account all characteristics defined for the respective product type

according to their product standard to ensure the proper function of the required drainage system.

8 Product standards
8.1 General

The product standards are describing detailed the characteristics and test methods of sanitary

appliances to fulfil the requirements for drainage systems according to EN 12056.

8.2 EN 997 — WCs
WC pans and suites are classified as described below:

Type 1: WC pans and suites designed for use with and tested using a nominal full flush volume of either

4 l, 5 l, 6 l, 7 l or 9 l.

Type 2: WC suites designed for using a maximum flushing volume of 6 l, or a dual-flush combining a

maximum flush of 6 l and a reduced flush no greater than two-thirds of the maximum flush volume.

The following types and subtypes of WCs are described in EN 997:
Type 1 — Subtype 9 (CL1 — 9)
— System I with a filling degree of maximum 50 % and minimum slope of 1,0 %;
— Minimum pipe diameter of 100 mm;
— Nominal flush volume 9 l;
— Test: Wash out of 50 balls to avoid any blockage in the connecting pipe.
Type 1 — Subtype 7 (CL1 — 7)
— System I with a filling degree of maximum 50 % and minimum slope of 1,0 %;
— Minimum pipe diameter of 100 mm;
— Nominal flush volume 7 l;
— Test: Wash out of 50 balls to avoid any blockage in the connecting pipe.
Type 1 — Subtype 6 (CL1 — 6)
— System I with a filling degree of maximum 50 % and minimum slope of 1,0 %;
— Minimum pipe diameter of 100 mm;
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SIST-TP CEN/TR 17426:2019
CEN/TR 17426:2019 (E)
— Nominal flush volume 6 l;

— After flush volume 2,5 l to ensure the transportation of solid waste in the connecting pipe with a

maximum length of 4 m.
Type 1 — Subtype 5 (CL1 — 5)
— System I with a filling degree of maximum 50 % and minimum slope of 1,0 %;
— Nominal flush volume 5 l;

— After flush volume 2,5 l to ensure the transportation of solid waste in the connecting pipe with a

maximum length of 4 m;

— Minimum diameter of 80 mm (DN 80/90) with the restriction: not more than 2 WCs and a total

change in direction of not more than 90°;

— Minimum pipe diameter of 100 mm with the restriction: if more than 2 WCs connected to one

connecting pipe.
Type 1 — Subtype 4 (CL1 — 4)
— System II with a filling degree of maximum 70 % and minimum slope of 1,5 %;
— Nominal flush volume 4 l;
— Test: Wash out of 50 balls to avoid any blockage in the connecting pipe;

— Minimum diameter of 80 mm with the restriction: not more than 2 WCs and a total change in

direction of not more than 90°.
Type 2 (CL2)
— System III with a filling degree of 100 %;
— Nominal flush volume less than 6 l;
— For WC suites only (every single WC bowl has to be tested as a suite);
— After flush volume 40 % of the full flush at least;
— Minimum pipe diameter of 100 mm.
See Figure 1.
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SIST-TP CEN/TR 17426:2019
CEN/TR 17426:2019 (E)

Figure 1 — Connection between subtypes of WCs according to EN 997 and intended drainage

system according to EN 12056
Protection of potable water — demands according to EN 1717:

Flushing devices for bowls have to be protected against backflow according to EN 1717.

Pressure valves shall be self-protected through an integrated pipe interrupter design type DC.

Flushing cisterns meet the requirements of EN 1717 in case they complying with the air gap requested

in the product standard EN 14055 and EN 997.
8.3 EN 13407 — urinals
Urinals are classified as described below:

Type 1: Wall-hung urinals intended to be installed in drainage systems of Type I, II in accordance with

EN 12056-2

Type 2: Wall-hung urinals intended to be installed in drainage systems of Type III in accordance with

EN 12056-2
Main distinction between Type 1 and Type 2 according to EN 12056:
Drainage System I Drainage System II Drainage System III
Type 1 Type 1 Type 2
Depth of water seal 50 mm 50 mm 75 mm
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SIST-TP CEN/TR 17426:2019
CEN/TR 17426:2019 (E)
Type 1 — Subtype 1

Siphonic action urinal with flushing rim and with integral trap or with dedicated trap specified by the

manufacturer
— designed for drainage system I with a filling degree of maximum 50 %;
— designed for drainage system II with a filling degree of maximum 70 %;

— tested according to the following requirements to ensure proper function in the required drainage

system
— siphonic action (exchange of the water in the trap),
— with a minimum depth of water seal 50 mm,
— wash of bowl,
...

SLOVENSKI STANDARD
kSIST-TP FprCEN/TR 17426:2019
01-september-2019
Sanitarne naprave - Sistemi za odvajanje odpadne vode iz sanitarnih naprav

Sanitary appliances - Drainage systems for the application of sanitary appliances

Sanitärausstattungsgegenstände - Entwässerungssysteme für den Einsatz von
Sanitärausstattungsgegenstände

Appareils sanitaires - Systèmes de drainage pour l'application des appareils sanitaires

Ta slovenski standard je istoveten z: FprCEN/TR 17426
ICS:
91.140.70 Sanitarne naprave Sanitary installations
91.140.80 Drenažni sistemi Drainage systems
kSIST-TP FprCEN/TR 17426:2019 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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kSIST-TP FprCEN/TR 17426:2019
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kSIST-TP FprCEN/TR 17426:2019
FINAL DRAFT
TECHNICAL REPORT
FprCEN/TR 17426
RAPPORT TECHNIQUE
TECHNISCHER BERICHT
May 2019
ICS
English Version
Sanitary appliances - Drainage systems for the application
of sanitary appliances

Appareils sanitaires - Systèmes de drainage pour Sanitärausstattungsgegenstände -

l'application des appareils sanitaires Entwässerungssysteme für den Einsatz von
Sanitärausstattungsgegenstände

This draft Technical Report is submitted to CEN members for Vote. It has been drawn up by the Technical Committee CEN/TC

163.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, 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 Technical Report. It is distributed for review and comments. It is subject to change without

notice and shall not be referred to as a Technical Report.
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. FprCEN/TR 17426:2019 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
kSIST-TP FprCEN/TR 17426:2019
FprCEN/TR 17426:2019 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

Introduction .................................................................................................................................................................... 4

1 Scope .................................................................................................................................................................... 5

2 Normative references .................................................................................................................................... 5

3 Terms and definitions ................................................................................................................................... 5

4 Drinking water installation ......................................................................................................................... 5

5 The drainage system ...................................................................................................................................... 6

5.1 Types of sewage water: black water and rain water .......................................................................... 6

5.2 Types of building drainage system: separate sewerage system and combined

sewerage system ............................................................................................................................................. 6

5.3 Drainage system: design and dimensioning .......................................................................................... 6

5.4 Basis for drainage systems .......................................................................................................................... 7

6 Types of drainage systems ........................................................................................................................... 7

6.1 System I: Single discharge stack system with partly filled branch discharge pipes ............... 7

6.2 System II: Single discharge stack system with small bore discharge branch pipes ................ 7

6.3 System III: Single discharge stack system with full bore branch discharge pipes ................... 7

6.4 System IV: Separate discharge stack system ......................................................................................... 7

6.5 Area of application.......................................................................................................................................... 7

7 Sanitary appliance .......................................................................................................................................... 8

8 Product standards .......................................................................................................................................... 8

8.1 General ................................................................................................................................................................ 8

8.2 EN 997 — WCs .................................................................................................................................................. 8

8.3 EN 13407 — urinals ..................................................................................................................................... 10

8.4 EN 14688 — Wash basins and EN 14528 — Bidets .......................................................................... 12

8.5 Shower trays — EN 14527 ......................................................................................................................... 13

8.6 Characteristics of any other sanitary appliances according the drainage system ............... 13

9 Summary ......................................................................................................................................................... 13

Annex A (informative) Use of drainage systems in Europe ........................................................................ 14

Annex B (informative) Special national rules ................................................................................................. 17

B.1 Forewords of Swedish standards: .......................................................................................................... 17

B.2 Further French regulations: ..................................................................................................................... 18

Annex C (informative) National product information point ...................................................................... 19

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kSIST-TP FprCEN/TR 17426:2019
FprCEN/TR 17426:2019 (E)
European foreword

This document (FprCEN/TR 17426:2019) has been prepared by Technical Committee CEN/TC 163

“Sanitary appliances”, the secretariat of which is held by UNI.
This document is currently submitted to the Vote on TR.
---------------------- Page: 5 ----------------------
kSIST-TP FprCEN/TR 17426:2019
FprCEN/TR 17426:2019 (E)
Introduction

Sewerage disposal is a very important task of building services engineering because of hygienic reasons.

The piping must drain waste water and rain water out of the building and lead it way from the building

safe. Blockages must be avoided by proper design of the drainage system as well as the use of the

appropriate selection of the sanitary appliances.

On one hand harmonized European standards exist for a lot of sanitary appliances to be installed as a

part of the drainage system. On the other hand some links and requirements disappeared or went out of

sight during the phase of harmonization.

This paper should close this gap and gives additional information on application conditions for sanitary

appliances to avoid malfunction of the drainage system.
It is not intended to give guidance on the system standards like EN 12056.
---------------------- Page: 6 ----------------------
kSIST-TP FprCEN/TR 17426:2019
FprCEN/TR 17426:2019 (E)
1 Scope

This document describes the installation rules that must be followed to ensure proper functioning of

the drainage system depending on the specified performance of the sanitary appliances.

These performance characteristics of sanitary appliances (defined in the harmonized standards EN 997,

EN 13407, EN 14688, EN 14528 and EN 14527) are explained and brought into line with the application

rules of standard series EN 12056.

According to Regulation (EU) 305/2011, legally binding information on building requirements must be

provided by the National Product Information Point. Therefore, additional national requirements are

mentioned informatively where information is available.
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 12056 (all parts), Gravity drainage systems inside buildings
EN 997, WC pans and WC suites with integral trap
EN 13407, Wall-hung urinals — Functional requirements and test methods
EN 14527, Shower trays for domestic purposes
EN 14528, Bidets — Functional requirements and test methods

EN 14688, Sanitary appliances — Wash basins — Functional requirements and test methods

EN 1717, Protection against pollution of potable water in water installations and general requirements of

devices to prevent pollution by backflow
EN 274 (all parts), Waste fittings for sanitary appliances
3 Terms and definitions
No terms and definitions are listed in this document.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at http://www.electropedia.org/
4 Drinking water installation

When choosing sanitary appliances, the rules for drinking water protection have to be taken into

account as well. Such rules are defined, e.g. in EN 1717 and the corresponding product standards in case

the product is concerned. Guidance will be given in this document.
Special aspects of national legislation have to be taken into account.
---------------------- Page: 7 ----------------------
kSIST-TP FprCEN/TR 17426:2019
FprCEN/TR 17426:2019 (E)
5 The drainage system
5.1 Types of sewage water: black water and rain water

Waste water or black water consists out of all sewage water from kitchen, bathroom, lavatory and other

facilities.
The source of rain water is the roof drainage and other paved areas.

In case black water and rain water will be mixed, it is called combined waste water.

5.2 Types of building drainage system: separate sewerage system and combined
sewerage system

For the discharge of wastewater inside buildings, several pipings from the sanitary appliances to the

connecting piping, the connecting sewer and finally to the public sewage water system are used.

Separate sewerage system means the two piping’s, one for rain water and one for waste water. It´s not

allowed using the waste water piping for rain water.

The size of the piping for waste water has to be calculated according the amount of waste water linked

to the sanitary appliances.

In case of a combined sewerage system, both types of sewage piping should be connected at the

connecting piping or the connecting sewer only. It is recommended to do so as close as possible to the

public sewage water system.
5.3 Drainage system: design and dimensioning

Design and dimensioning of the drainage system inside buildings is very important. It has to be taken

into account:
— minimum slope,
— minimum flow rate,
— filling level and
— ventilation
of the drainage system.

Only in case all aspects are respected properly the function of the drainage system is warranted, i.e.

solids can be flushed out sufficient with the first flush and transported later on.

Wrong dimensioning will lead to failures such as:

— in case of too small pipes: the waste water system is not capable to take the complete waste water

and also ventilation. This means: blockage occurs;

— in case of too big pipes: solid waste will not transported sufficiently. Blockages will occur.

Pouring down more water in the drain is not the solution!
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5.4 Basis for drainage systems

Basic standard for drainage systems in Europe is the series of standards EN 12056 (Gravity drainage

systems inside buildings) consisting of:
— Part 1: General and performance requirements
— Part 2: Sanitary pipework, layout and calculation
— Part 3: Roof drainage, layout and calculation
— Part 4: Wastewater lifting plants. Layout and calculation

— Part 5: Installation and testing, instructions for operation, maintenance and use

The EN 12056 series has to be understood as a basic standard to be used as a European frame work.

Additional national rules have to be taken into account. Special aspects of national legislation may

overrule certain requirements of EN 12056.

If a reference to EN 12056 is made in the following, this refers to the series of the standard with all

parts.
6 Types of drainage systems

Different types of drainage system are installed all over Europe. Variations are based on differing types

of sanitary appliances, history of the installation and technical habits of building.

EN 12056 defines four types of drainage systems, which mainly differ in terms of allowed filling level in

the connecting pipes.

6.1 System I: Single discharge stack system with partly filled branch discharge pipes

Sanitary appliances are connected to partly filled branch discharge pipes. The partly filled branch

discharge pipes are designed with a filling degree of 0,5 (50 %) and are connected to a single discharge

stack.

6.2 System II: Single discharge stack system with small bore discharge branch pipes

Sanitary appliances are connected to small bore branch discharge pipes. The small bore branch

discharge pipes are designed with a filling degree of 0,7 (70 %) and are connected to a single discharge

stack.

6.3 System III: Single discharge stack system with full bore branch discharge pipes

Sanitary appliances are connected to full bore branch discharge pipes. The full bore branch discharge

pipes are designed with a filling degree of 1,0 (100 %) and each branch discharge pipe is separately

connected to a single discharge stack.
6.4 System IV: Separate discharge stack system

Drainage systems Type I, II and III may also be divided into a black water stack serving WC’s and urinals

and a grey water stack serving all other appliances.
6.5 Area of application
In Annex A is shown the use of the drainage system by country.
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7 Sanitary appliance

The main purpose of sanitary appliances is personal hygiene. For this they are designed to receive

water and to lead the water into the drainages system completely.

Each sanitary appliance delivers water with a specific flow rate (design unit [l/s]) to the drainage

system. To allow a proper calculation and dimensioning of the pipes, the calculation values for sanitary

appliances are described in detail in EN 12056.

For a proper function according the rules of EN 12056, in product standards various types and subtypes

are described including their underlying characteristics and test procedures.

Hence it is necessary to take into account all characteristics defined for the respective product type

according to their product standard to ensure the proper function of the required drainage system.

8 Product standards
8.1 General

The product standards are describing detailed the characteristics and test methods of sanitary

appliances to fulfill the requirements for drainage systems according to EN 12056.

8.2 EN 997 — WCs
WC pans and suites are classified as described below:

Type 1: WC pans and suites designed for use with and tested using a nominal full flush volume of either

4 l, 5 l, 6 l, 7 l or 9 l.

Type 2: WC suites designed for using a maximum flushing volume of 6 l, or a dual-flush combining a

maximum flush of 6 l and a reduced flush no greater than two-thirds of the maximum flush volume.

The following types and subtypes of WCs are described in EN 997:
Type 1 — Subtype 9 (CL1 — 9)
— System I with a filling degree of maximum 50 % and minimum slope of 1,0 %;
— Minimum pipe diameter of 100 mm;
— Nominal flush volume 9 l;
— Test: Wash out of 50 balls to avoid any blockage in the connecting pipe.
Type 1 — Subtype 7 (CL1 — 7)
— System I with a filling degree of maximum 50 % and minimum slope of 1,0 %;
— Minimum pipe diameter of 100 mm;
— Nominal flush volume 7 l;
— Test: Wash out of 50 balls to avoid any blockage in the connecting pipe.
Type 1 — Subtype 6 (CL1 — 6)
— System I with a filling degree of maximum 50 % and minimum slope of 1,0 %;
— Minimum pipe diameter of 100 mm;
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— Nominal flush volume 6 l;

— After flush volume 2,5 l to ensure the transportation of solid waste in the connecting pipe with a

maximum length of 4 m.
Type 1 — Subtype 5 (CL1 — 5)
— System I with a filling degree of maximum 50 % and minimum slope of 1,0 %;
— Nominal flush volume 5 l;

— After flush volume 2,5 l to ensure the transportation of solid waste in the connecting pipe with a

maximum length of 4 m;

— Minimum diameter of 80 mm (DN 80/90) with the restriction: not more than 2 WCs and a total

change in direction of not more than 90°;

— Minimum pipe diameter of 100 mm with the restriction: if more than 2 WCs connected to one

connecting pipe.
Type 1 — Subtype 4 (CL1 — 4)
— System II with a filling degree of maximum 70 % and minimum slope of 1,5 %;
— Nominal flush volume 4 l;
— Test: Wash out of 50 balls to avoid any blockage in the connecting pipe;

— Minimum diameter of 80 mm with the restriction: not more than 2 WCs and a total change in

direction of not more than 90°.
Type 2 (CL2)
— System III with a filling degree of 100 %;
— Nominal flush volume less than 6 l;
— For WC suites only (every single WC bowl has to be tested as a suite);
— After flush volume 40 % of the full flush at least;
— Minimum pipe diameter of 100 mm.
See Figure 1.
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Figure 1 — Connection between subtypes of WCs according to EN 997 and intended drainage

system according to EN 12056
Protection of potable water — demands according EN 1717:

Flushing devices for bowls have to be protected against backflow according to EN 1717.

Pressure valves shall be self-protected through an integrated pipe interrupter design type DC.

Flushing cisterns meet the requirements of EN 1717 in case they complying with the air gap requested

in the product standard EN 14055 and EN 997.
8.3 EN 13407 — urinals
Urinals are classified as described below:

Type 1: Wall-hung urinals intended to be installed in drainage systems of Type I, II in accordance with

EN 12056-2

Type 2: Wall-hung urinals intended to be installed in drainage systems of Type III in accordance with

EN 12056-2
Main distinction between Type 1 and Type 2 according to EN 12056:
Drainage System I Drainage System II Drainage System III
Type 1 Type 1 Type 2
Depth of water seal 50 mm 50 mm 75 mm
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Type 1 — Subtype 1

Siphonic action urinal with flushing rim and with integral trap or with dedicated trap specified by the

manufacturer
— designed for drainage system I with a filling degree of maximum 50 %;
— designed for drainage system II with a filling degree of maximum 70 %;
— tested according to the following requirements to ensu
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