AS 3500 4 1 1997 national plumbing and drainage hot water

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AS 3500.4.1-1997 National Plumbing and Drainage - Hot water supply systems Performance requirements

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AS 3500.4.1—1997

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Australian Standard
National Plumbing and Drainage
Part 4.1: Hot water supply
systems—Performance
requirements


This Australian Standard was prepared by Committee WS/14, National Plumbing
and Drainage Code. It was approved on behalf of the Council of Standards
Australia on 22 August 1997 and published on 5 October 1997.

The following interests are represented on Committee WS/14:
Association of Hydraulic Services Consultants, Australia
AUSTAP
Australian Association of Certification Bodies
Australian Building Codes Board
Australian Chamber of Manufactures
Australian Gas Association
Brisbane Water
Department of Lands Planning and Environment, N.T.
Department of Land and Water Conservation, N.S.W.
Department of Environment and Land Management, Tas.
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Department of Urban Services, A.C.T.
Electricity Supply Association of Australia
Gas Appliance Manufacturers Association of Australia
Housing Industry Association, Australia
Master Builders Australia
Master Plumbers Australia
Metal Trades Industry Association of Australia
National Association Sanitary Plumbing and Drainage Contractors, Australia
New Zealand Manufacturers Federation
New Zealand Society of Master Plumbers and Gasfitters
Plastics and Chemicals Industry Association Australia
Plumbers, Gasfitters and Drainlayers Board of New Zealand
Queensland Department of Local Government and Planning
South Australian Water Corporation
South Australian Health Commission
Sydney Water Corporation

Review of Australian Standards. To keep abreast of progress in industry, Australian Standards are
subject to periodic review and are kept up to date by the issue of amendments or new editions as
necessary. It is important therefore that Standards users ensure that they are in possession of the latest
editi on, and any amendments thereto.
Full details of all Australian Standards and related publi cations will be found in the Standards Australia
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Australian Standard’, which subscribing members receive, and which gives details of new publications,
new editions and amendments, and of withdrawn Standards.
Suggestions for improvements to Australian Standards, addressed to the head office of Standards
Australia, are welcomed. Notification of any inaccuracy or ambiguity found in an Australian Standard
should be made wit hout delay in order that the matter may be investigated and appropriate action taken.

This Standard was issued in draft form for comment as DR 96402.


AS 3500.4.1—1997

Licensed to LUU MINH LUAN on 26 Feb 2002. Single user licence only. Storage, distribution or use on network prohibited.

Australian Standard
National Plumbing and Drainage
Part 4.1: Hot water supply
systems—Performance
requirements

First published as AS 3500.4.1—1997.

PUBLISHED BY STANDARDS AUSTRALIA
(STANDARDS ASSOCIATION OF AUSTRALIA)

1 THE CRESCENT, HOMEBUSH, NSW 2140
ISBN 0 7337 1450 1


AS 3500.4.1 — 1997

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PREFACE
This Standard was prepared by the Joint Standards Australia/Standards New Zealand
Committee WS/14, National Plumbing and Drainage Code and is the result of a consensus
among representatives on the Joint Committee to produce it as an Australian Standard.
New Zealand performance requirements are established in New Zealand Building
Regulations and are generally equivalent to those in this Standard.
This Standard sets out objectives in Clause 5.
Reference to AS/NZS 3500.4.2, National Plumbing and Drainage, Part 4.2: Hot water
supply systems— Acceptable solutions sets out a means of achieving minimum deemed-tosatisfy requirements for the objectives and performance requirements of this Standard.

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It is recognized that the content of this Part would usually be the responsibility of a
regulatory body. Nevertheless, owing to the reforms taking place in the industry at
present, no national body has yet been identified to take up such responsibilities.
Therefore, for the purpose of this edition the document is published as part of the
AS 3500 series. If in the future a national regulatory administration is identified, the
Standard will be modified accordingly.
The performance requirements of this Standard have been published without a ‘durability’
clause. This course of action was found necessary owing to a division existing within the
committee members responsible for the document. It is possible that in the future such
durability requirements could become part of this document by means of an amendment or

a full revision.

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AS 3500.4.1 — 1997

CONTENTS
Page

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SCOPE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
APPLICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
REFERENCED DOCUMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DEFINITIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
OBJECTIVES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
FUNCTIONAL REQUIREMENT — FIXTURES AND APPLIANCES . . . . . . . . .
PERFORMANCE REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DEEMED TO SATISFY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
MEANS OF VERIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

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4
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AS 3500.4.1 — 1997

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STANDARDS AUSTRALIA
Australian Standard
National Plumbing and Drainage
Part 4.1: Hot water supply systems— Performance requirements
1 SCOPE This Standard sets out the requirements for the design and construction of
hot water services, from the water service to the points of discharge.
2 APPLICATION This Standard applies to new installations, alterations, additions and
repairs to existing installations.
NOTE: This Standard should also be read in conjunction with Australian by-laws and
regulations of the regulatory authority.

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3 REFERENCED DOCUMENTS The following documents are referred to in this
Standard:
AS/NZS
3500
National Plumbing and Drainage
3500.0 Glossary of terms
3500.4.2 Part 4.2 Hot water supply systems
4 DEFINITIONS For the purpose
AS/NZS 3500.0 and that below apply.
4.1
5

of this Standard,

the definitions

given in

Adequate—means sufficient to achieve the objectives of this Standard.
OBJECTIVES

The objectives of this Standard are as follows:

(a)

Safeguard people from illness due to consumption of, or contact with, contaminated
water.

(b)

Safeguard people from injury due to the failure of a pressure vessel or from contact
with excessively hot water.

(c)

Safeguard people from the loss of amenity arising from a lack of hot water for
personal hygiene or from a water supply which is offensive in appearance, taste or
odour.

(d)

Ensure that suitable hot water facilities are provided for the use of people with

disabilities.

(e)

Ensure that the hot water supply installation throughout its design life will continue
to satisfy the requirements of Items (a), (b), (c) and (d).

6 FUNCTIONAL REQUIREMENT —FIXTURES AND APPLIANCES Fixtures and
appliances where required shall have a safe and adequate piped hot water supply suitable
for the intended purpose.
7

PERFORMANCE REQUIREMENTS

7.1 Hot water supplies Installations intended to supply hot water for human
consumption, food preparation, utensil washing or personal hygiene shall be connected to
a potable water supply.
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7.2 Non-potable hot water supplies
hot water shall be clearly identified.

AS 3500.4.1 — 1997

Pipe outlets and fittings supplying non-potable

7.3 Hot water temperatures Where hot water is provided to fixtures and appliances

used primarily for personal hygiene, it shall be delivered at a temperature not exceeding
50°C to avoid the likelihood of scalding.
7.4 Hot water supply installations
and constructed to—

Hot water supply installations shall be designed

(a)

avoid the likelihood of contamination of potable water within both the system and
the water main by means which are appropriate to the hazard;

(b)

provide water to fixtures and appliances at flow rates and temperatures which are
adequate for the correct functioning of those fixtures and appliances under normal
conditions and in a manner that does not create undue noise;

(c)

avoid the likelihood of leakage or failure;

(d)

allow reasonable access for maintenance of mechanical components; and

(e)

allow the system, appliances and backflow prevention devices to be isolated for
testing and maintenance.

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7.5 Pressure vessels Pressure vessels used for producing or storing hot water shall be
provided with safety devices which —
(a)

relieve excessive pressure during both normal and abnormal conditions; and

(b)

limit temperatures to avoid the likelihood of flash steam production in the event of
rupture.

7.6 Hot water storage Heated water shall be stored under conditions which prevent
the growth of legionella bacteria.
7.7 People with disabilities Facilities provided for people with disabilities shall have
hot water supply taps or other operational controls that are accessible and useable.
8 DEEMED TO SATISFY Compliance with AS/NZS 3500.4.2 shall be deemed to
satisfy the requirements of this Standard.
9 MEANS OF VERIFICATION Verification acceptable to a regulatory authority can
be demonstrated either —
(a)

by calculation and certification by persons or organizations with recognized
credentials in the design or testing of hot water supply systems; or

(b)

by satisfying the required criteria when tested in accordance with a specified test

method endorsed by a recognized auditing body.

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