SIST EN 14654-3:2021
(Main)Drain and sewer systems outside buildings - Management and control of activities - Part 3: Drain and sewer cleaning
Drain and sewer systems outside buildings - Management and control of activities - Part 3: Drain and sewer cleaning
This European Standard establishes requirements for the management and control of activities in drain and sewer systems outside buildings and specifies requirements for development and implementation of work programmes, and the selection of techniques.
This document covers the management and control of sewer cleaning.
It is applicable to drain and sewer systems from the point where wastewater leaves a building, roof drainage system, or paved area, to the point where it is discharged into a wastewater treatment plant or receiving water body.
Drains and sewers below buildings are included provided that they do not form part of the drainage system of the building.
Entwässerungssysteme außerhalb von Gebäuden - Management und Überwachung von Maßnahmen - Teil 3: Kanalreinigung
Dieses Dokument stellt die Anforderungen an das Management und an die Überwachung von Maßnahmen in Entwässerungssystemen außerhalb von Gebäuden auf und legt Anforderungen an die Entwicklung und Umsetzung der Arbeitsprogramme und die Auswahl von Maßnahmen fest.
Dieses Dokument behandelt das Management und die Überwachung der Kanalreinigung.
Es gilt für Entwässerungssysteme von dem Punkt an, wo das Abwasser das Gebäude, die Dachentwässerung oder die befestigte Fläche verlässt, bis zu dem Punkt, an dem das Abwasser in eine Kläranlage oder in ein aufnehmendes Gewässer eingeleitet wird.
Abwasserleitungen und -kanäle unterhalb von Gebäuden sind hierbei eingeschlossen, solange sie nicht Bestandteil der Gebäudeentwässerung sind.
Réseaux d'évacuation et d'assainissement à l'extérieur des bâtiments - Gestion et contrôle des activités opérationnelles - Partie 3: Curage des branchements et des collecteurs
Le présent document établit les prescriptions de gestion et de contrôle des activités dans les réseaux d’évacuation et d’assainissement à l’extérieur des bâtiments, et spécifie les prescriptions concernant l’élaboration et la mise en oeuvre de programmes de travaux, ainsi que le choix des techniques employées.
Le présent document traite de la gestion et du contrôle du curage des collecteurs.
Il s’applique aux réseaux d’évacuation et d’assainissement à partir du point où les eaux usées quittent un bâtiment, un système d’évacuation de toiture ou une surface revêtue, jusqu’au point où elles se déversent dans une station d’épuration ou un milieu récepteur aquatique.
Les branchements et les collecteurs d’assainissement situés sous les bâtiments sont également visés dès l’instant qu’ils ne font pas partie du système d’évacuation propre au bâtiment.
Sistemi za odvod odpadne vode in kanalizacijo zunaj stavb - Upravljanje in nadzor aktivnosti - 3. del: Čiščenje odpadne vode in kanalizacije
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 14654-3:2021
01-marec-2021
Nadomešča:
SIST EN 14654-1:2014
Sistemi za odvod odpadne vode in kanalizacijo zunaj stavb - Upravljanje in nadzor
aktivnosti - 3. del: Čiščenje odpadne vode in kanalizacije
Drain and sewer systems outside buildings - Management and control of activities - Part
3: Drain and sewer cleaning
Entwässerungssysteme außerhalb von Gebäuden - Management und Überwachung von
Maßnahmen - Teil 3: Kanalreinigung
Réseaux d'évacuation et d'assainissement à l'extérieur des bâtiments - Gestion et
contrôle des activités opérationnelles - Partie 3: Curage des branchements et des
collecteurs
Ta slovenski standard je istoveten z: EN 14654-3:2021
ICS:
93.030 Zunanji sistemi za odpadno External sewage systems
vodo
SIST EN 14654-3:2021 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 14654-3:2021
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SIST EN 14654-3:2021
EN 14654-3
EUROPEAN STANDARD
NORME EUROPÉENNE
January 2021
EUROPÄISCHE NORM
ICS 93.030 Supersedes EN 14654-1:2005
English Version
Drain and sewer systems outside buildings - Management
and control of activities - Part 3: Drain and sewer cleaning
Réseaux d'évacuation et d'assainissement à l'extérieur Entwässerungssysteme außerhalb von Gebäuden -
des bâtiments - Gestion et contrôle des activités Management und Überwachung von Maßnahmen - Teil
opérationnelles - Partie 3: Curage des branchements et 3: Kanalreinigung
des collecteurs
This European Standard was approved by CEN on 6 December 2020.
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, 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
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 14654-3:2021 E
worldwide for CEN national Members.
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EN 14654-3:2021 (E)
Contents Page
European foreword . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
3.1 General . 6
3.2 Deposits . 7
3.3 Cleaning techniques . 7
4 General . 8
5 Integrated sewer system management planning . 8
5.1 Introduction . 8
5.2 Cleaning aims . 8
6 Preparation of the cleaning programme . 9
6.1 Introduction . 9
6.2 Review of the cleaning activities planning . 9
6.3 Investigation . 9
6.4 Assessment . 10
6.5 Development of the programme . 11
7 Preparation of the project specification . 12
7.1 Introduction . 12
7.2 Review of the project description and project objectives . 12
7.3 Investigation . 12
7.4 Assessment . 13
7.5 Drafting the project specification. 13
7.6 Performance indicators . 15
8 Implementation of projects . 16
8.1 Introduction . 16
8.2 Select cleaning method . 16
8.3 Health and safety . 17
8.4 Environmental impact . 17
8.5 Cleaning report . 18
9 Measurement of conformity . 18
9.1 Measuring conformity with the project specification . 18
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9.2 Non-conformities . 18
10 Review of plan and programme . 19
Annex A (informative) Example of cleaning report form . 20
Annex B (informative) Drain and sewer cleaning techniques . 21
Bibliography . 24
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EN 14654-3:2021 (E)
European foreword
This document (EN 14654-3:2021) has been prepared by Technical Committee CEN/TC 165
“Wastewater Engineering”, the secretariat of which is held by DIN.
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 July 2021, and conflicting national standards shall be
withdrawn at the latest by July 2021.
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, together with EN 14654-1:2021 supersedes EN 14654-1:2014.
The changes to the text in this document are largely editorial and relate to the separation of the
duplicated text.
EN 14654 consists of the following parts, under the general title Drain and sewer systems outside
buildings — Management and control of activities:
— Part 1: General
— Part 2: Rehabilitation
— Part 3: Drain and sewer cleaning (the present document)
— Part 4: Control of inputs from users
Other parts, dealing with other activities, may be added later.
In drafting this part of EN 14654, account has been taken of other available standards, in particular
EN 752, Drain and sewer systems outside building and EN 13508 Investigation and assessment of drain
and sewer systems outside buildings.
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, Turkey and the
United Kingdom.
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1 Scope
This document establishes requirements for the management and control of activities in drain and
sewer systems outside buildings and specifies requirements for development and implementation of
work programmes, and the selection of techniques.
This document covers the management and control of drain and sewer cleaning.
It is applicable to drain and sewer systems from the point where wastewater leaves a building, roof
drainage system, or paved area, to the point where it is discharged into a wastewater treatment plant or
receiving water body.
Drains and sewers below buildings are included provided that they do not form part of the drainage
system of the building.
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 752, Drain and sewer systems outside buildings - Sewer system management
EN 1829-1, High pressure water jet machines - Safety requirements - Part 1: Machines
EN 1829-2, High-pressure water jet machines - Safety requirements - Part 2: Hoses, hose lines and
connectors
EN 13508-1:2012, Investigation and assessment of drain and sewer systems outside buildings - Part 1:
General Requirements
EN 14654-1:2021 Drain and sewer systems outside buildings - Management and control of activities -
Part 1: General
EN 16323:2014, Glossary of wastewater engineering terms
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3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN
16323:2014, EN 14654-1:2021 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia available at http://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
NOTE Certain key definitions from EN 16323:2014 have been repeated below for clarity. The following
additional terms used in this document are defined in EN 16323:2014.
— drain
— foul wastewater
— sewer
— sewer system
— receiving water body
— surface receiving water body
— wastewater treatment plant
3.1 General
3.1.1
cleaning activities
removal or partial removal of settled deposits, attached deposits, roots and other obstacles from a drain
or sewer system
3.1.2
degree of cleaning
extent to which complete removal of deposits is achieved
3.1.3
removal
extraction of deposits after collecting at the working area or the intentional use of the flow in the drain
or sewer to carry the re-entrained solids to a specified point of extraction
3.1.4
self-cleansing
ability of the flow in a drain or sewer to carry away solid particles which would otherwise be deposited
in the pipe
[SOURCE: EN 16323:2014, 2.2.1.13]
3.1.5
supernatant liquor
liquor in a tank lying above the deposited solids
[SOURCE: EN 16323:2014, 2.1.2.16]
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3.1.6
wastewater
water composed of any combination of water discharged from domestic, industrial or commercial
premises, surface run-off and accidentally any sewer infiltration water
[SOURCE: EN 16323:2014, 2.3.10.65]
3.2 Deposits
3.2.1
attached deposits
material attached to the wall of elements of the drain or sewer system by physical or chemical bonding
3.2.2
settled deposits
material deposited by gravity in the invert or benching of elements of the drain or sewer system
3.3 Cleaning techniques
3.3.1
cleaning ball
spherical device, having an indented surface, designed to be carried through a drain or sewer by the
flow to facilitate removal of sediments
3.3.2
combined jetting
simultaneous use of high-pressure water jetting equipment together with a suction action, to remove
obstructions or sediments from drains or sewers
[SOURCE: EN 16323:2014, 2.2.1.10]
3.3.3
flushing
use of a temporary and substantially increased flow to facilitate the removal of obstructions or
sediments from drains or sewers
[SOURCE: EN 16323:2014, 2.2.1.16]
3.3.4
jetting
use of water under defined conditions of pressure, through a nozzle
[SOURCE: EN 16323:2014, 2.2.1.18]
3.3.5
rodding
use of appropriate device on the end of flexible rods to facilitate the removal of obstructions (or
sediments) from drains or sewers
[SOURCE: EN 16323:2014, 2.2.1.11]
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3.3.6
scouring plate
device used to clean a drain or sewer by concentrating the flow into a small cross section thereby
increasing the flow velocity
3.3.7
winching
use of a device pulled through a drain or sewer to facilitate removal of sediments (or obstructions)
[SOURCE: EN 16323:2014, 2.2.1.12]
4 General
Cleaning activities in drains and sewers can be carried out pro-actively, to prevent problems occurring
or to clean a drain or sewer before particular operations (e.g. an inspection or renovation work) or
reactively in response to problems that have occurred.
The requirements for pro-active cleaning can be identified through a rehabilitation plan, a maintenance
plan involving periodic monitoring or as part of an integrated sewer system management plan in
accordance with EN 752. Consideration shall also be given to the feasibility of preventing deposition of
sediments for example by rehabilitation of the sewer.
This document applies the process described in EN 14654-1 for implementing cleaning activities in the
integrated drain and sewer system management plan. This document shall be used in conjunction with
EN 14654-1.
5 Integrated sewer system management planning
5.1 Introduction
Cleaning activities are one aspect of the maintenance plan, as part of an integrated sewer system
management plan. A maintenance plan dealing with cleaning activities should be in place for the drain
and sewer system prior to carrying out major programmes of sewer cleaning. However, this is not
always possible if works are required urgently (e.g. in response to a sewer failure).
5.2 Cleaning aims
The principal aims of carrying out cleaning work can include:
a) Pro-active cleaning
1) to ensure that the performance of the drain or sewer system is acceptable;
2) to prolong the operational life and maintain the value of the asset;
3) to control septicity to reduce associated odour, health and potential corrosion problems;
4) to limit polluting discharges into receiving water bodies;
5) to enable inspection or renovation of the drain or sewer system;
6) to optimize the effectiveness of key components of the system at critical times (e.g. prior to
heavy rain seasons, busy periods in tourist sites);
7) to facilitate inspection.
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b) Reactive cleaning
1) to restore the flow (e.g. by removing a blockage);
2) to restore the function of the drain or sewer system;
3) to reduce septicity and odour problems (e.g. by removing sediments).
The nature of the aim can determine the degree of cleaning necessary.
6 Preparation of the cleaning programme
6.1 Introduction
The cleaning programme defines the approach to be taken to cleaning in each drain or sewer, either
specifically or as part of a group of drains or sewers. The cleaning programme defines a series of
projects, in line with the integrated sewer system management plan, to ensure that the drain and sewer
system meets the performance requirements.
6.2 Review of the cleaning activities planning
A review should be undertaken of the cleaning aspects of the operations and maintenance plan within
the integrated sewer system management plan.
6.3 Investigation
6.3.1 Introduction
The location of the sections of drains and sewers where proactive cleaning is to be carried out and the
assessment of the cleaning frequencies shall be based on:
a) an understanding of the characteristics and structural condition of the drain and sewer system;
b) an analysis of its performance;
c) a review of the available information which may include the performance of similar systems
elsewhere.
The different sections of the sewer shall be described according to the information collected in order to
optimize the cleaning programme.
The scope of the investigations necessary to produce the cleaning programme will depend on the extent
of the investigations carried out during the preparation of the integrated sewer system management
plan and on the characteristics of the individual systems.
6.3.2 Review of previous investigations
A review should be undertaken of the information available. The review should include:
a) inventory data
1) type of effluent (foul wastewater, surface water, combined sewage or specific effluents);
2) sewer characteristics (shape, size, slope, depth, material, etc.), presence and characteristics of
combined sewer overflows and other ancillaries;
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3) characteristics of the location of the sewer (e.g. aquifer protection zones, ground water level,
trees, proximity of receiving water bodies);
b) condition information from inspection reports (e.g. visual inspection reports, CCTV reports,
sediment measurements);
c) data on flows from measurements or the results of hydraulic models;
d) records of past cleaning (e.g. location of areas of persistent operational problems, working space
and access constraints, effectiveness of previous techniques, personnel input and costs); and
e) performance data (e.g. sewer flooding, sewer blockages, collapses, odours, septicity problems,
premature operation of combined sewer overflows, etc.).
6.3.3 Further investigations
Where there is insufficient information available to plan the cleaning programme, a programme of
investigations shall be carried out to obtain the necessary information.
An example report form is given in Annex A.
Examples of investigations can include:
a) further inspection in parts of the system where the original assessment was based only on sample
inspections;
b) use of an appropriate sewer flow simulation model;
c) more detailed studies of the impact of any discharges on receiving water bodies.
Details of investigation techniques for drains and sewers are described in EN 13508-1:2012.
6.4 Assessment
The assessment should identify the location of those components of the drains and sewer system where
proactive or reactive cleaning is to be carried out. This shall be based on:
a) effects of the deposits on the performance of the system;
b) sources of such deposits;
c) typology of the drain or sewer;
d) nature of the effluent.
The performance of the drain or sewer systems shall be assessed in accordance with EN 13508-1:2012,
Clause 6, using the results of the investigation (see 6.3). The assessments carried out during the
preparation of the integrated sewer system management plan should be reviewed and updated in the
light of any new information identified during the investigations. The performance at each planning
horizon shall be compared to the performance requirements to identify the need for cleaning.
Where inspection is used to determine the current levels of sediment, the effect of the movement of
sediment in dunes, leaving some parts of the pipe clear while other localized parts of the sewer have
significant deposits, should be considered. However, localized sediments may also indicate the presence
of an obstacle.
The typology of drains and sewers can be identified as:
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— type 1: drains and sewers which are self-cleansing, where proactive cleaning is exceptional;
— type 2: drains and sewers which are not completely self-cleansing, where proactive cleaning could
be beneficial, the cleaning frequencies depending on the rate of sediment accumulation;
— type 3: drains and sewers with localized problems, which require frequent cleaning.
The typology can change over time.
Other elements of the sewer system, for example sewer connections, gullies, silt traps, inverted siphons,
pumping stations, rising mains and vacuum systems also require cleaning.
NOTE: Information on pumping stations, rising mains and vacuum systems are given in EN 16932 parts
1 to 3.
6.5 Development of the programme
6.5.1 Introduction
A cleaning programme shall:
a) identify optimum frequencies for pro-active cleaning operations;
b) maintain or reduce the number of reactive cleaning operations to an acceptable level.
6.5.2 Specification of objectives
The cleaning objectives should be established in accordance with the cleaning aim. These should be
expressed as a performance requirement, for example:
a) to remove settled and/or attached deposits to a prescribed amount (for example remove
completely or to a maximum depth);
b) to restore the flow capacity in a pipe to the design capacity;
c) to limit the build-up of sediments to a prescribed level;
d) to limit the deposits to existing levels (maintaining a balance in the sediment movement);
e) to limit the build-up of deposits so that sewer flooding is limited to prescribed frequencies;
f) to remove sufficient deposits to avoid blockages;
g) to remove sufficient sediments to allow an inspection to take place or to facilitate renovation or
repair;
h) to remove bio-films (for example from rising mains to reduce septicity, or from heat exchangers).
6.5.3 Developing options
There are a number of possible cleaning approaches, including:
a) periodic cleaning (cleaning according to fixed time intervals);
b) monitored periodic cleaning (cleaning according to time interval, the subsequent time interval is
updated according to the depth of deposits prior to previous cleaning);
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c) planned inspection (by CCTV or other technique) and cleaning (inspection at intervals in order to
determine when deposits have reached a threshold level for cleaning);
d) specific cleaning before other works such as CCTV inspection, rehabilitation operations, etc.;
e) reactive cleaning - in those sections of drains and sewers which are normally self-cleansing;
f) action to control discharge of unsuitable materials into the drain or sewer system (see
EN 14654-4:2021).
Where frequent cleaning is required, or where the consequences of sediment accumulation are severe,
consideration should be given to the feasibility of carrying out rehabilitation works to prevent the
accumulation of sediments.
6.5.4 Assess feasibility of solutions
In addition to the factors specified in EN 14654-1:2021, 6.5.4, the assessment should consider whether
the options developed would increase the capacity of the sewer system.
6.5.5 Select optimum solution
The optimum solution should be selected in accordance with EN 14654-1:2021, 6.5.5. As well as the
costs, the relative benefits of each option should also be taken into account.
6.5.6 Producing the programme
In addition to the information specified in EN 14654-1:2021, 6.5.6, the programme should specify:
a) location and length of the sewers to be cleaned or inspected;
b) nature of the deposits anticipated to be removed (for example intruding roots, sediments,
obstacles).
7 Preparation of the project specification
7.1 Introduction
A cleaning specification defines in detail the cleaning work to be carried out in a group of drains or
sewers. The specification should be in accordance with the approach defined in the cleaning
programme.
7.2 Review of the project description and project objectives
The review should be carried out in accordance with EN 14654-1:2021, 7.2, and should include an
assessment as to whether there have been any changes to the information identified during the
preparation of the cleaning programme.
7.3 Investigation
An investigation should be carried out to determine the following:
a) extent of the deposits or obstructions, including deposits in lateral connections to the sewer;
b) nature of the deposits expected (e.g. grease, sand);
c) whether the deposits are the cause (wholly or partially) of any reported performance problems;
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d) amount of deposits which need to be removed to restore acceptable performance having regard to
the likely rate of re-deposition following cleaning;
e) structural condition of the drain or sewer and the type of material;
f) other information that could affect the feasibility of sewer cleaning work.
The investigation should be carried out using the existing data available. Further investigation can be
necessary.
7.4 Assessment
The assessment shall be carried out in accordance with EN 14654-1:2021, 7.4.
7.5 Drafting the project specification
7.5.1 Introduction
In accordance with EN 14654-1:2021, 7.5, the drafting of the project specification involves the following
stages: prepare potential solutions, assess feasibility of solutions, select optimal solutions, detailed
design of optimal solution.
7.5.2 Prepare potential solutions
Solutions should be developed for the pipeline sections and other components to be cleaned and the
amount of deposits that need to be removed. The feasibility of these solutions should be evaluated
taking into account:
a) nature of the deposits or obstacles to be removed;
b) size of the drain or sewer;
c) range of water depths and the flow regimes within the drain or sewer;
d) restrictions on the access, including:
1) traffic restrictions, traffic safety and safe working space,
2) availability of suitable manholes or inspection chambers,
3) size of the equipment and the available working space,
4) need for off-road vehicles and their suitability to the site conditions,
5) weight of the vehicle and the risk of the damage to the drain or sewer,
6) land ownership,
e) structural condition and the type of material of the drain or sewer and its susceptibility to
deterioration due to damage through cleaning;
f) extent to which they meet the cleaning aims;
g) risk the sewer cl
...
SLOVENSKI STANDARD
oSIST prEN 14654-3:2019
01-julij-2019
Sistemi za odvod odpadne vode in kanalizacijo zunaj stavb - Upravljanje in nadzor
aktivnosti - 3. del: Čiščenje
Drain and sewer systems outside buildings - Management and control of activities - Part
3: Cleaning
Entwässerungssysteme außerhalb von Gebäuden - Management und Überwachung von
Maßnahmen - Teil 3: Reinigung
Réseaux d'évacuation et d'assainissement à l'extérieur des bâtiments - Gestion et
contrôle des activités opérationnelles - Partie 3: Curage
Ta slovenski standard je istoveten z: prEN 14654-3
ICS:
93.030 Zunanji sistemi za odpadno External sewage systems
vodo
oSIST prEN 14654-3:2019 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 14654-3:2019
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oSIST prEN 14654-3:2019
DRAFT
EUROPEAN STANDARD
prEN 14654-3
NORME EUROPÉENNE
EUROPÄISCHE NORM
April 2019
ICS 93.030
English Version
Drain and sewer systems outside buildings - Management
and control of activities - Part 3: Cleaning
Réseaux d'évacuation et d'assainissement à l'extérieur Entwässerungssysteme außerhalb von Gebäuden -
des bâtiments - Gestion et contrôle des activités Management und Überwachung von Maßnahmen - Teil
opérationnelles - Partie 3: Curage 3: Reinigung
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, 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 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
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 14654-3:2019 E
worldwide for CEN national Members.
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Contents Page
European foreword . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
3.1 General . 6
3.2 Deposits . 6
3.3 Cleaning methods . 6
4 General . 7
5 Integrated sewer system management planning . 8
5.1 Introduction . 8
5.2 Cleaning aims . 8
6 Preparation of the cleaning programme . 8
6.1 Introduction . 8
6.2 Review of the cleaning activities planning . 8
6.3 Investigation . 9
6.3.1 Introduction . 9
6.3.2 Review of previous investigations . 9
6.3.3 Further investigations . 9
6.4 Assessment . 10
6.5 Develop the programme . 10
6.5.1 Introduction . 10
6.5.2 Specification of objectives . 11
6.5.3 Developing options . 11
6.5.4 Assess feasibility of solutions . 11
6.5.5 Select optimum solution . 11
6.5.6 Producing the programme . 12
7 Preparation of the project specification . 12
7.1 Introduction . 12
7.2 Review of the project description and project objectives . 12
7.3 Investigation . 12
7.4 Assessment . 12
7.5 Drafting the project specification. 12
7.5.1 Introduction . 12
7.5.2 Prepare detailed solutions . 13
7.5.3 Assess feasibility of solutions . 13
7.5.4 Select optimal solution . 13
7.5.5 Detailed design of optimal solution . 13
7.5.6 Prepare project specification . 14
7.6 Performance indicators . 15
7.6.1 Introduction . 15
7.6.2 Indicators for the assessment of the work quality . 15
7.6.3 Indicators for the assessment of the effectiveness of the project or programme . 15
8 Implementation of projects . 15
8.1 Introduction . 15
8.2 Select cleaning technique . 16
8.3 Health and safety . 16
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8.4 Environmental impact . 17
8.5 Cleaning report . 17
9 Measurement of conformity . 18
9.1 Measuring conformity with the project specification . 18
9.2 Non-conformities . 18
10 Review of plan and programme . 18
Annex A (informative) Example of cleaning report form . 19
Annex B (informative) Cleaning methods . 20
B.1 General . 20
B.2 Jetting . 20
B.3 Jetting with suction . 20
B.4 Winching . 21
B.5 Rodding . 21
B.6 Remote controlled equipment . 21
B.7 Flushing . 21
B.8 Cleaning balls/scouring plates . 21
B.9 Manual or mechanical excavation . 21
Bibliography . 22
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European foreword
This document (prEN 14654-3:2019) has been prepared by Technical Committee CEN/TC 165
“Wastewater Engineering”, the secretariat of which is held by DIN.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 14654-1:2014.
The changes to the text in this document are editorial and relate to the separation of the duplicated text.
There are no technical changes.
EN 14654 consists of the following parts, under the general title Drain and sewer systems outside
buildings — Management and control of activities:
— Part 1: General; (the present document)
— Part 2: Rehabilitation
— Part 3: Sewer cleaning
— Part 4: Control of inputs
Other parts, dealing with other activities, may be added later.
In drafting this part of EN 14654, account has been taken of other available standards, in particular
EN 752, Drain and sewer systems outside buildings” and EN 13508 Investigation and assessment of drain
and sewer systems outside buildings”.
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1 Scope
This document establishes requirements for the management and control of activities in drain and
sewer systems outside buildings and specifies requirements for development and implementation of
work programmes, and the selection of techniques.
This document covers the management and control of sewer cleaning.
It is applicable to drain and sewer systems from the point where wastewater leaves a building, roof
drainage system, or paved area, to the point where it is discharged into a wastewater treatment plant or
receiving water body.
Drains and sewers below buildings are included provided that they do not form part of the drainage
system of the building.
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 752, Drain and sewer systems outside buildings - Sewer system management
EN 1829-1, High pressure water jet machines - Safety requirements - Part 1: Machines
EN 1829-2, High-pressure water jet machines - Safety requirements - Part 2: Hoses, hose lines and
connectors
EN 13508-1:2012, Investigation and assessment of drain and sewer systems outside buildings - Part 1:
General Requirements
prEN 14654-1:2019 Drain and sewer systems outside buildings — Management and control of
activities — Part 1: General
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 16323:2014,
prEN 14654-1:2019 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
Note 1 to entry: Certain key definitions from EN 16323:2014 have been repeated below for clarity. The
following additional terms used in this European Standard are defined in EN 16323:2014.
— drain
— foul wastewater
— sewer
— sewer system
— receiving water body
— surface receiving water body
— wastewater treatment plant
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3.1 General
3.1.1
cleaning activities
removal or partial removal of settled deposits, attached deposits, roots and other obstacles from a drain
or sewer system
3.1.2
degree of cleaning
extent to which complete removal of deposits is achieved
3.1.3
removal
extraction of deposits after collecting at the working area or the intentional use of the flow in the drain
or sewer to carry the re-entrained solids to a specified point of extraction
3.1.4
self-cleansing
ability of the flow in a drain or sewer to carry away solid particles which would otherwise be deposited
in the pipe
[SOURCE: EN 16323:2014, 2.2.1.13]
3.1.5
supernatant liquor
liquor in a tank lying above the deposited solids
[SOURCE: EN 16323:2014, 2.1.2.16]
3.1.6
wastewater
water composed of any combination of water discharged from domestic, industrial or commercial
premises, surface run-off and accidentally any sewer infiltration water
[SOURCE: EN 16323:2014, definition 2.3.10.65]
3.2 Deposits
3.2.1
attached deposits
material attached to the wall of elements of the drain or sewer system by physical or chemical bonding
3.2.2
settled deposits
material deposited by gravity in the invert or benching of elements of the drain or sewer system
3.3 Cleaning methods
3.3.1
cleaning ball
spherical device, having an indented surface, designed to be carried through a drain or sewer by the
flow to facilitate removal of sediments
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3.3.2
combined jetting
simultaneous use of high-pressure water jetting equipment together with a suction action, to remove
obstructions or sediments from drains or sewers
[SOURCE: EN 16323:2014, 2.2.1.10]
3.3.3
flushing
use of a temporary and substantially increased flow to facilitate the removal of obstructions or
sediments from drains or sewers
[SOURCE: EN 16323:2014, 2.2.1.16]
3.3.4
jetting
use of water under defined conditions of pressure, through a nozzle
[SOURCE: EN 16323:2014, 2.2.1.18]
3.3.5
rodding
use of appropriate device on the end of flexible rods to facilitate the removal of obstructions (or
sediments) from drains or sewers
[SOURCE: EN 16323:2014, 2.2.1.11]
3.3.6
scouring plate
device used to clean a drain or sewer by concentrating the flow into a small cross section thereby
increasing the flow velocity
3.3.7
winching
use of a device pulled through a drain or sewer to facilitate removal of sediments (or obstructions)
[SOURCE: EN 16323:2014, 2.2.1.12]
4 General
Cleaning activities in drains and sewers can be carried out pro-actively, to prevent problems occurring
or to clean a drain or sewer before particular operations (e.g. an inspection or renovation work) or
reactively in response to problems that have occurred.
The requirements for pro-active cleaning can be identified through a rehabilitation plan, a maintenance
plan involving periodic monitoring or as part of an integrated sewer system management plan in
accordance with EN 752. Consideration shall also be given to the feasibility of preventing deposition of
sediments for example by rehabilitation of the sewer.
This document applies the process described in EN 14654-1 for implementing cleaning activities in the
integrated drain and sewer system management plan. This document shall be used in conjunction with
EN 14654-1.
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5 Integrated sewer system management planning
5.1 Introduction
Cleaning activities are one aspect of the maintenance plan, as part of an integrated sewer system
management plan. A maintenance plan, dealing with cleaning activities should be in place for the drain
and sewer system prior to carrying out major programmes of sewer cleaning. However, this is not
always possible if works are required urgently (e.g. in response to a sewer failure).
5.2 Cleaning aims
The principal aims of carrying out cleaning work can include:
a) Pro-active cleaning
1) to ensure that the performance of the drain or sewer system is acceptable;
2) to prolong the operational life and maintain the value of the asset;
3) to control septicity to reduce associated odour, health and potential corrosion problems;
4) to limit polluting discharges into receiving water bodies;
5) to enable inspection or renovation of the drain or sewer system;
6) to optimize the effectiveness of key components of the system at critical times (e.g. prior to
heavy rain seasons, busy periods in tourist sites);
7) to facilitate inspection.
b) Reactive cleaning
1) to remove a blockage in order to restore the flow;
2) to restore the function of the drain or sewer system;
3) to remove sediments in order to reduce septicity and odour problems.
The nature of the aim can determine the degree of cleaning necessary.
6 Preparation of the cleaning programme
6.1 Introduction
The cleaning programme defines the approach to be taken to cleaning in each drain or sewer, either
specifically or as part of a group of drains or sewers. The cleaning programme defines a series of
projects, in line with the integrated sewer system management plan, to ensure that the drain and sewer
system meets the performance requirements.
6.2 Review of the cleaning activities planning
A review should be undertaken of the cleaning aspects of the operations and maintenance plan within
the integrated sewer system management plan.
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6.3 Investigation
6.3.1 Introduction
The location of the sections of drains and sewers where proactive cleaning is to be carried out and the
assessment of the cleaning frequencies shall be based on:
a) an understanding of the characteristics and structural condition of the drain and sewer system;
b) an analysis of its performance;
c) a review of the available information which may include the performance of similar systems
elsewhere.
The different sections of the sewer shall be described according to the information collected in order to
optimize the cleaning programme.
The scope of the investigations necessary to produce the cleaning programme will depend on the extent
of the investigations carried out during the preparation of the integrated sewer system management
plan and on the characteristics of the individual systems.
6.3.2 Review of previous investigations
A review should be undertaken of the information available. The review should include:
a) inventory data
1) type of effluent (foul wastewater, surface water, combined sewage or specific effluents);
2) sewer characteristics (shape, size, slope, depth, material, etc.), presence and characteristics of
combined sewer overflows and other ancillaries;
3) characteristics of the location of the sewer (e.g. aquifer protection zones, ground water level,
trees, proximity of receiving water bodies);
b) condition information from inspection reports (e.g. visual inspection reports, CCTV reports,
sediment measurements);
c) data on flows from measurements or the results of hydraulic models;
d) records of past cleaning (e.g. location of areas of persistent operational problems, working space
and access constraints, effectiveness of previous techniques, personnel input and costs); and
e) performance data (e.g. sewer flooding, sewer blockages, collapses, odours, septicity problems,
premature operation of combined sewer overflows, etc.).
6.3.3 Further investigations
Where there is insufficient information available to plan the cleaning programme, a programme of
investigations shall be carried out to obtain the necessary information.
An example report form is given in Annex A.
Examples of investigations can include:
a) further inspection in parts of the system where the original assessment was based only on sample
inspections;
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b) the use of an appropriate sewer flow simulation model;
c) more detailed studies of the impact of any discharges on receiving waters bodies.
Details of investigation techniques for drains and sewers are described in EN 13508-1.
6.4 Assessment
The assessment should identify the location of those components of the drains and sewer system where
proactive or reactive cleaning is to be carried out. This shall be based on:
a) the effect of the deposits on the performance of the system;
b) the sources of such deposits;
c) the typology of the drain or sewer;
d) the nature of the effluent.
The performance of the drain or sewer systems shall be assessed in accordance with EN 13508-1:2012,
Clause 6, using the results of the investigation (see 6.3). The assessments carried out during the
preparation of the integrated sewer system management plan should be reviewed and updated in the
light of any new information identified during the investigations. The performance at each planning
horizon shall be compared to the performance requirements to identify the need for cleaning.
Where inspection is used to determine the current levels of sediment, the effect of the movement of
sediment in dunes, leaving some parts of the pipe clear while other localized parts of the sewer have
significant deposits, should be considered. However, localized sediments may also indicate the presence
of an obstacle.
The typology of drains and sewers can be identified as:
— type 1: drains and sewers which are self-cleansing, where proactive cleaning is exceptional;
— type 2: drains and sewers which are not completely self-cleansing, where proactive cleaning could
be beneficial, the cleaning frequencies depending on the rate of sediment accumulation;
— type 3: drains and sewers with localized problems, which require frequent cleaning.
The typology can change over time.
Other elements of the sewer system, for example sewer connections, gullies, silt traps, inverted siphons,
pumping stations can also require cleaning.
6.5 Develop the programme
6.5.1 Introduction
A cleaning programme shall:
a) identify optimum frequencies for pro-active cleaning operations;
b) maintain or reduce the number of reactive cleaning operations to an acceptable level.
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6.5.2 Specification of objectives
The cleaning objectives should be established in accordance with the cleaning aim. These should be
expressed as a performance requirement, for example:
a) to remove settled and/or attached deposits to a prescribed amount, (for example remove
completely or to a maximum depth); or
b) to restore the flow capacity in a pipe to the design capacity; or
c) to limit the build-up of sediments to a prescribed level; or
d) to limit the deposits to existing levels (maintaining a balance in the sediment movement); or
e) to limit the build-up of deposits so that sewer flooding is limited to prescribed frequencies; or
f) to remove sufficient deposits to avoid blockages; or
g) to remove sufficient sediments to allow an inspection to take place or to facilitate renovation or
repair;
h) to remove bio-films (for example from rising mains to reduce septicity, or from heat exchangers).
6.5.3 Developing options
There are a number of possible cleaning approaches, these include the following:
a) periodic cleaning (cleaning according to fixed time intervals);
b) monitored periodic cleaning (cleaning according to time interval, the subsequent time interval is
updated according to the depth of deposits prior to previous cleaning);
c) planned inspection (by CCTV or other method) and cleaning (inspection at intervals in order to
determine when deposits have reached a threshold level for cleaning);
d) specific cleaning before other works such as CCTV inspection, rehabilitation operations, etc.;
e) reactive cleaning - in those sections of drains and sewers which are normally self-cleansing;
f) action to control discharge of unsuitable materials into the drain or sewer system unsuitable input
(see prEN 14654-4:2019).
Where frequent cleaning is required, or where the consequences of sediment accumulation are severe,
consideration should be given to the feasibility of carrying out rehabilitation works to prevent the
accumulation of sediments.
6.5.4 Assess feasibility of solutions
In addition to the factors specified in prEN 14654-1:2019, 6.5.4 the assessment should consider
whether the options developed would increase the capacity of the sewer system.
6.5.5 Select optimum solution
The optimum solution should be selected in accordance with prEN 14654-1:2019,
...
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