National foreword

This British Standard is the UK implementation of ISO 24516‑2:2019.

The UK participation in its preparation was entrusted to Technical Committee CB/503, Drinking water and wastewater service levels.

A list of organizations represented on this committee can be obtained on request to its secretary.

This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.

Compliance with a British Standard cannot confer immunity from legal obligations.

This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 May 2019.

Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents).

Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISO's adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www.iso.org/iso/foreword.html.

This document was prepared by Technical Committee ISO/TC 224, Service activities relating to drinking water supply, wastewater and stormwater systems.

A list of all parts in the ISO 24516 series can be found on the ISO website.

Any feedback or questions on this document should be directed to the user’s national standards body. A complete listing of these bodies can be found at www.iso.org/members.html.

Introduction

This document is written within the overall concept of management of assets, which is an activity all organizations undertake in some manner and to some degree. It focuses on the details of managing the physical assets at the operational level rather than the organizational (corporate management, structural or process) level.

Drinking water utilities are reliant on their assets to deliver their services to users in their service areas. The assets (e.g. reservoirs, wells, treatment plants, pumping stations, underground pipes and storage tanks) collectively form the physical infrastructure of drinking water utilities and are the consequence of the accumulated capital investments and operational expenditures on maintenance and rehabilitation over many years. In many of these utilities, the replacement value of these past investments will amount to many millions (even billions) of US dollars depending on the size of the community served. The infrastructure represents a major societal investment in essential services contributing to public health and the protection of the environment.

In many countries, these assets have been identified as critical infrastructure and programs are in place to ensure their protection or their sustainability. Like many other organizations with assets, drinking water utilities undertake programs of activities to manage the assets to ensure they continue to meet the needs of the community for reliable delivery of drinking water. These management activities can be at the strategic, tactical or operational level. The activities can be part of a formal management system, the result of specific legislative requirements, or simply the result of due diligence by the service operators and managers.

This document can serve as a supporting document for utilities operating an asset management system regardless of whether or not the utilities make use of any management system standard, for example ISO 55001.

In many countries there is a recognized sustainability problem, sometimes referred to as the infrastructure gap, which recognizes that, for various reasons, the infrastructure has not been maintained over the years on a truly sustainable basis, i.e. funding and implementation of rehabilitation programs have been postponed, with a focus instead on short-term repairs or an allowed decrease in the level of service provided.

The condition of water infrastructures greatly influences the adequacy of the drinking water service from the aspects of quality, quantity, pressure, safety, reliability, environmental impact, sustainability, degree of treatment and efficiency. Drinking water system condition-based rehabilitation approaches serve to meet these requirements with a focus on a holistic approach of condition-based, risk-oriented maintenance.

As the installation and development of water assets matures, the optimization of drinking water infrastructure will become necessary in many places in order to compensate for ageing and wear and tear, and to respond to changing societal and economic conditions. Consequently, water infrastructure assets are subject not only to ageing and wear and tear but also to adaptation processes resulting from growth, new legislative requirements, technical innovations or users' changing service-level expectations. This requires drinking water utilities not only to focus on maintenance and rehabilitation but also to keep future requirements and developments in mind. Rehabilitation will thus become essential in the management of assets, with ever more stringent requirements on the design and execution of rehabilitation.

In recent years, much effort has been applied to the whole issue of management of assets on two levels:

What are the principles and structure of an asset management system?
What are the good practices that can be implemented on a technical level to assess the condition of the assets and help decide when asset interventions (repair, renovation or replacement) should take place?

This document describes the information required and how to collect and process reliable inventory, condition, operational and context data about technical assets of drinking water systems, including failures. These data should be the basis for a systematic management of assets and can be used for benchmarking purposes. A reliable database that supports analysis of failures and of operational data (including a description of the condition of facilities or units) is of particular significance when establishing a risk-based investigation to determine maintenance and rehabilitation priorities.

This document also provides advice on how to define a strategy for management of assets with regard to the overall performance expected by the drinking water utility and other stakeholders. It includes several aspects of operation and maintenance, including asset condition assessment and investment strategies (new assets and rehabilitation).

The usual and expected goal in the effective management of assets is to provide an appropriate service life while fulfilling given requirements in a cost-effective manner.

This document is intended to provide guidance on the assets typically owned or operated by drinking water utilities (waterworks – including collection, treatment, pumping and storage) that are expected to meet users' needs and expectations over longer (multi-generational) periods.

Additional information on objectives for management of assets of waterworks is provided in Annex A. An outline of the content of a drinking water master plan is provided in Annex B. Examples of inventory, condition and operational data are provided in Annex C. Methods for the risk-based assessment for rehabilitation are shown in Annex D.

1 Scope

This document specifies guidelines for technical aspects, tools and good practices for the management of assets of waterworks to maintain value from existing assets. This document includes the following asset types: treatment plants, sludge treatment facilities, pumping stations, reservoirs, tanks and dosing equipment, metering and ancillary infrastructure irrespective of where they are sited, in the waterworks or in the drinking water distribution network.

For further guidance on drinking water distribution networks see ISO 24516‑1.

NOTE 1 The management of transmission mains is addressed in ISO 24516‑1 irrespective of where these assets are sited in the drinking water system.

This document is focused on the assets typically owned or operated by drinking water utilities (drinking water systems) that in parts are expected to meet users’ needs and expectations over longer (multi-generational) periods.

This document includes examples of good practice approaches on the strategic, tactical and operational levels.

This document is applicable to all types and sizes of organization and/or utilities operating drinking water systems.

NOTE 2 Depending on the size and structure of an organization, the utility can decide to what extent it applies the guidance in this document. In any case, the philosophy of this document remains applicable even to small and medium utilities.

NOTE 3 This includes all different roles/functions for the management of assets within a utility (e.g. asset owner/responsible body, asset manager/operator, service provider/operator).

2 Normative references

3 Terms and definitions

4 Principle aspects of the management of assets

4.1 Objectives and requirements

4.2 General aspects

4.3 Risks and life cycle aspects

4.4 Structuring the process for the management of assets

5 Investigation

5.1 General

5.2 Purpose of investigation

5.3 Determine the scope of the investigation

5.4 Types of investigation

5.5 Data collection

5.6 Data registering and data assignment

5.7 Review existing information

5.8 Inventory update

5.9 Review of performance information

5.10 Planning of investigation

5.11 Performance testing

6 Assessment

6.1 Process

6.2 Assessment of hydraulic and drinking water quality performance

6.3 Assessment of process performance

6.4 Assessment of structural condition

6.5 Assessment of operational performance

6.6 Comparison with performance requirements

6.7 Identification of unacceptable impacts

6.8 Identification of causes of performance deficiencies

7 Planning

7.1 General

7.2 Develop integrated solutions

7.3 Assess solutions

7.4 Prepare action plan

8 Implementation

8.1 Introduction

8.2 Create/update plan

8.3 Carry out work

8.4 Monitor performance

8.5 Review performance

9 Operation and maintenance

9.1 General

9.2 Operation

9.3 Maintenance

10 Rehabilitation

10.1 General

10.2 Strategic plan for rehabilitation of physical infrastructure (long-term planning)

10.3 Tactical plan for rehabilitation of physical infrastructure (mid-term planning)

10.4 Operational plan — Implementation of rehabilitation measures (short-term planning)

11 Documentation and performance review

Bibliography

BS ISO 24516-2:2019

Guidelines for the management of assets of water supply and wastewater systems - Waterworks

Current, Under Review

Published:

31 May 2019