Code of practice for water services

CP 48 : 2005

SS 636:2018+A2:2020

(ICS 91.140.60)

SINGAPORE STANDARD

Code of practice for water services

(Formerly CP 48)

Incorporating Amendment No. 1

to No. 4

and 2

CP 48 : 2005

(ICS 91.140.60)

SS 636:2018+A2:2020

(ICS 91.140.60)

SINGAPORE STANDARD

Code of practice for water service

Published by Enterprise Singapore

All rights reserved. Unless otherwise specified, no part of this Singapore Standard may be reproduced or utilised in any form or by any means, electronic or mechanical, including photocopying and microfilming, without permission in writing from Enterprise Singapore. Request for permission can be sent to: [email protected].

© Enterprise Singapore 2020

ISBN 978-981-47-8494-8

2

COPYRIGHT

SS 636:2018+A2:2020

This Singapore Standard was approved by the Building and Construction Standards Committee on behalf of the Singapore Standards Council of Singapore on 4 9 March 2005 2018.

First published as CP 48, 1990

First revision, 2005

Second revision, 2005. and re-designated as SS 636, 2018

The Building and Construction Standards Committee, appointed by the Standards Council, consists of the following members:

Name Capacity

Chairman : Mr Goh Peng Thong Member, Standards Council

1st _Deputy

Chairman : Dr Tam Chat Tim Member, Standards Council

2nd _Deputy

Chairman : Mr Tan Tian Chong Member, Standards Council

Secretary 1 : Mr Kenneth Lim See Khoon SPRING Singapore

Secretary 2 : Ms Lee Hiok Hoong SPRING Singapore

Members : Mr Boo Geok Kwang Singapore Civil Defence Force / Fire Safety

and Shelter Department

Chairman : MrAr. Chan Kok Way Individual Capacity

Dr Jimmy Chen Wie Ying Individual Capacity

Deputy

Chairman : Er. Mr Chin Jen ChyiClement

Tseng

Building and Construction Authority

Secretary : Mr Chong Kee SenMs Amy Sim Standards Development Organisation –

The Institution of Engineers, Singapore

Members : Mr Bin Chee Kwan National Environment Agency

Er. Chan Ewe Jin The Institution of Engineers, Singapore

Mr Shawn Chan Singapore Manufacturing Federation

Er. Chee Kheng Chye Housing & Development Board

Mr Chng Chee Beow Real Estate Developers’ Association of

Singapore

Mr Desmond Hill Dominic Choy Singapore Contractors Association Limited

Ltd

Er. Paul Fok Land Transport Authority

Mr Joseph Lai Kuong Kiu Goh

Ngan Hong

Singapore Institute of Surveyors and Valuers JTC Corporation

Mr Desmond Hill Individual Capacity

Prof Ho Puay Peng National University of Singapore

Ar. William Lau Individual Capacity

MrAr. Benedict Lee Khee Chong Singapore Institute of Architects

Er. Lee Chuan Seng Individual Capacity

Assoc Prof Leong Eng Choon Nanyang Technological University Mr Darren Lim Bok Ngam Land Transport Building and Construction

Authority

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SS 636:2018+A2:2020

Assoc Prof Gary Ong Khim Chye

Dr Lim Lan Yuan

Association of Property and Facility

Managers National University of Singapore

Er. See Sing Kok Singapore Manufacturers’ Federation

Er. Shum Chee Hoong Housing & Development Board

Dr Tan GuanEr. Lim Peng Hong Association of Consulting Engineers,

Singapore

Er. Mohd Ismadi Ministry of Manpower

Ms Kay Pungkothai National Parks Board

Er. Yvonne Soh Singapore Green Building Council

SAC Christopher Tan Singapore Civil Defence Force

Er. Tang Pei Luen JTC Corporation

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SS 636:2018+A2:2020

The Technical Committee on Building Services Maintenance and Management, appointed by the Building and Construction Standards Committee and responsible for the preparation of this standard,

consists of representatives from the following organisations:

Name Capacity

Chairman : Dr Jimmy Chen Wie Ying Lim Lan Yuan

Individual Capacity Deputy

Chairman : Er. Tang Pei Luen JTC Corporation

Secretary : Mr Kenneth Lim See Khoon

Ms Lydia Yap

SPRING Singapore Standards Development Organisation – The Institution of Engineers, Singapore

Members : Mr Bok Chee Meng Eric

Chan Kim Mun

Association of Property and Facility Managers Building and Construction Authority

Mr Bernard Cheng SETSCO Services Pte Ltd

Prof Bong Tet Yin Michael

Chew

ASHRAE, National University of Singapore Chapter

Mr David Goh Fire Safety Managers’ Association (Singapore)

Mr Chai Ng Fook Goh Sheng

Jie

Housing & Development Board

Dr Kang Kok Hin Institution of Facilities Management

Mr Eddy Lau Singapore Green Building Council

Mr Lee Wee Keong Singapore Civil Defence Force

Mr Lim Chong Yong Building and Construction Authority Mr Kenneth Lim National Environment Agency

Dr John Minn Singapore Institute of Building Limited

Er. Ramahad Singh PUB, Singapore’s National Water Agency Dr Sun QiqingMr Chue Fook

Chee

CPG Consultants TÜV SÜD PSB Pte Ltd

Mr Tan Ann Kiong Singapore Contractors Association Limited

Er. Roland Tan Juay Pah The Institution of Engineers, Singapore

Mr Kang Ngek Kong Too

Yew Yong

Energy Market Authority

Er. Yeow Mei Leng Association of Consulting Engineers Singapore Co-opted

Members : Mr Chue Fook Chee Individual Capacity

Mr Kua Soo Chong Individual Capacity

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Members Mr Kuang Kim Yaw Public Utilities Board

Mr Simon Lee Institution of Engineers, Singapore

Mr Lee Wee Keong Singapore Civil Defence Force / Fire Safety and

Shelter Department

Mr Lim See Gan Public Utilities Board

Mr Lum Yun Kheun Surbana (subsidiary of HDB Corp)

Assoc Prof Ng Kim Choon National University of Singapore

Mr Mel Saiquel Singapore Contractors Association Limited

Mr Tay Cher Seng Institution of Engineers, Singapore

Mr Wang Chin Chong Ngee Ann Ploytechnic

Assoc Prof Wong Yew Wah Nanyang Technological University

Mr Philip Ying JTC Corporation

The Working Group, appointed by the Technical Committee to assist in the preparation of this standard,

comprises the following experts who contribute in their individual capacity:

Name

Convenor : Er. Tan Heng Wee Yeow Mei Leng

Members : Mr Chua Cher Cheow Thomas

Ang

Mr Kuang Kim Yaw

Er.Mr Johnny Ng Kim Leang

Mr Ramahad Singh Amos

Phua

Er. Roland Tan Juay Pah

Mr Tan Kah Kyee

Mr Steven Tang Wah Keong Er. Denis Wong Tak Ming

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The organisations in which the experts of the Working Group are nominated/recommended by the following

organisations involved are:

Association of Consulting Engineers Singapore Housing & Development Board

PUB, Singapore’s National Water Agency Singapore Plumbing Society

Singapore Sanitary Ware Importers & Exporters Association

The Institution of Engineers, Singapore Public Utilities Board

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Contents

1.2 DefinitionsNormative references 78

3 Terms and definitions 9

1.34 Preliminaries 911

4.1 General 11

4.2 Supplies from the Authority 11

4.3 NEWater 12

4.4 Private water supplies 12

1.45 Standards of materials and fittings 1012

26 Distribution 13

26.1 Pipework 1113

26.2 Choice of materials for piping 1214

26.3 Mains 1315

26.4 Services 1416

26.5 Hot water supply systems 1618

26.6 Mode of water supply 1719

26.7 Distribution in tall buildings 1825

26.8 Fire-fightingFirefighting services 1825

37 Storage 25

37.1 General 1925

37.2 Storage capacity 2228

37.3 Storage tanks 2229

48 Fittings and appliances 29

48.1 Rates of flowWater efficiency 2329

48.2 Fittings 2430

48.3 Appliances 2633

59 Work on site 34

59.1 Jointing of pipes 2834

59.2 Connections between different materials 3036

59.3 Jointing pipes to cisterns and tanks 3037

59.4 Mainlaying 3137 59.5 Service pipes 3138 59.6 Meters 3239 59.7 Pipework in services 3348 59.8 Draw-off taps 34 48

59.9 SterilisationDisinfection of installation 34

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610 Inspection, testing and maintenance 49

610.1 General 34 49 610.2 Mains 34 49 610.3 Services 35 50 610.4 Maintenance 35 50 711 Water conservation 52 711.1 General 37 52

711.2 Water conservation measures 38

52

11.3 Private water meters 54

ANNEX

Annexes

A SterilisationDisinfection of installation 40

56 B Water sampling test for leaching of heavy metals 60

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1 Flow rates at for various fittings or appliances 2330

2 Maximum allowable flow rates and timing for self-closing delayed-action taps 2431

3 Recommended meter sizes 3339

4 Spacing of fixings for piping 3448

5 Water usage areas where water use is to be monitored 55 B.1 Tests for heavy metals 60

B.2 Sample points 60

Figures

1 Mode of water supply to water fittings located below 125 up to 25 m reduced

above mean sea level

4321

2 Mode of water supply to water fittings located higher than 25 m above 125 m

reduced mean sea level but below 137up to 37 m reducedabove mean sea

level

44

22

3 Mode of water supply to water fittings located above 137m reduced 37 m above mean sea level

4523

4 System for raising and distributing water in high-rise buildings with

multi-stage pumping 46

24

5 Water meter in chamber 4741

6 Water meter in chamber (with separate underground valve chamber) 4842

7a7 Water meter and valves in chamber 4943

7b8 Water meter and valves in chamber (alternate view) 5044

89 Meter fixed horizontally and enclosed in gate pillar (for landed properties) 5145

910 Sub-meters fixed vertically and enclosed in service duct 5246

1011 Sub-meters fixed horizontally and enclosed in service duct 5347

11 Installation of water saving devices for various taps 54

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Foreword

This Singapore Standard was prepared by a Working Group appointed by the Technical Committee on Building Services Maintenance and Management under the purview direction of the Building and Construction Standards Committee.

The requirements under this Code are supplementary to the Public Utilities (Water Supply) Regulations and subsequent amendments and any guidelines which the Public Utilities Board may issue from time to time. Where any requirement of this Code conflicts with any specific requirement specified in the Public Utilities (Water Supply) Regulations and subsequent amendments or any guidelines issued by the Public Utilities Board (PUB), the requirements stipulated by PUB shall prevail.

This Code is based on the 1981 edition of the Public Utilities Board Code of Practice on Water Services and is intended to provide guidance to Professional Engineers, Registered Architects and Licensed Water Services Plumbers in the design, installation, fixing, testing and maintenance of water services in all residential, commercial and industrial buildings/premises.

In preparing this Code, reference was also made to BS 6700 “Specification for design, installation, testing and maintenance of services supplying water for domestic use within buildings and their curtilages”.

Acknowledgement is made for the use of information from the above references and the publications

listed at the end of this Code.The standard is a revision of CP 48 : 2005 “Code of practice for water

services” and has been re- designated as SS 636.

This revision is to bring the standard up-to-date with the latest relevant overseas standards, in particular, the alignment of testing methods with international practices.

This standard is expected to be used by Professional Engineers, registered Architects and Licensed Plumbers in the design, installation, fixing, testing and maintenance of water services in all residential, commercial and industrial buildings/premises.

As amended, Aug 2019

Attention is drawn to the possibility that some of the elements of this Singapore Standard may be the subject of patent rights. Enterprise Singapore shall not be held responsible for identifying any or all of such patent rights.