ISO 15748-1:2002

INTERNATIONAL ISO
STANDARD 15748-1
First edition
2002-05-01
Ships and marine technology — Potable
water supply on ships and marine
structures —
Part 1:
Planning and design
Navires et technologie maritime — Approvisionnement en eau potable sur
navires et structures maritimes —
Partie 1: Planification et conception

Reference number
©
ISO 2002
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©  ISO 2002
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ii © ISO 2002 – All rights reserved

Contents Page
Foreword.iv
1 Scope .1
2 Normative references.1
3 Terms and definitions .2
4 Capacity requirements.5
5 Sanitary requirements.5
6 Potable water supply systems .6
7 Technical requirements .7
8 Pipelines .7
9 Pipes and pipe dimensions .9
10 Fittings and pipe joints .9
11 Fittings.9
12 Protective fittings .10
13 Pumps.10
14 Potable water tanks.11
15 Potable water heating plants.13
16 Sterilization of potable water.16
17 Layout of piping.18
18 Calculation principles .21
19 Testing and flushing of pipelines .21
Annex A (informative) Explanations.22
Annex B (informative) Appropriate pipe dimensions .23
Annex C (informative) Inspection and maintenance of filters .25
Bibliography.26

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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.
The main task of technical committees is to prepare International Standards. Draft International Standards adopted
by the technical committees are circulated to the member bodies for voting. Publication as an International
Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this part of ISO 15748 may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 15748-1 was prepared by Technical Committee ISO/TC 8, Ships and marine technology, Subcommittee SC 3,
Piping and machinery.
ISO 15748 consists of the following parts, under the general title Ships and marine technology — Potable water
supply on ships and marine structures:
— Part 1: Planning and design
— Part 2: Method of calculation
Annexes A, B and C of this part of ISO 15748 are for information only.

iv © ISO 2002 – All rights reserved

INTERNATIONAL STANDARD ISO 15748-1:2002(E)

Ships and marine technology — Potable water supply on ships
and marine structures —
Part 1:
Planning and design
1 Scope
This part of ISO 15748 applies to the planning, design and configuration of potable water supply systems on ships,
stationary or floating marine structures and inland navigation vessels.
This part of ISO 15748 specifies the minimum requirements for potable water supply systems to be met in order to
protect the potable water and to maintain its quality.
It also provides hints on components to be used and on laying of the pipelines.
NOTE The transfer of potable water and the regulations to be observed are not covered by this part of ISO 15748. The
transfer of potable water is subject to special regulations.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of
this part of ISO 15748. For dated references, subsequent amendments to, or revisions of, any of these publications
do not apply. However, parties to agreements based on this part of ISO 15748 are encouraged to investigate the
possibility of applying the most recent editions of the normative documents indicated below. For undated
references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain
registers of currently valid International Standards.
ISO 7-1, Pipe threads where pressure-tight joints are made on the thread — Part 1: Dimensions, tolerances and
designation
ISO 65, Carbon steel tubes suitable for screwing in accordance with ISO 7-1
ISO 161-1, Thermoplastics pipes for the conveyance of fluids — Nominal outside diameters and nominal
pressures — Part 1: Metric series
ISO 228-1, Pipe threads where pressure-tight joints are not made on the threads — Part 1: Dimensions, tolerances
and designation
ISO 274, Copper tubes of circular section — Dimensions
ISO 426-2, Wrought copper-zinc alloys — Chemical composition and forms of wrought products — Part 2: Leaded
copper-zinc alloys
ISO 1127, Stainless steel tubes — Dimensions, tolerances and conventional masses per unit length
ISO 1635, Wrought copper and copper alloys — Round tubes for general purposes — Mechanical properties
ISO 4200, Plain end steel tubes, welded and seamless — General tables of dimensions and masses per unit
length
ISO 5620-1, Shipbuilding and marine structures — Filling connection for drinking water tanks — Part 1: General
requirements
ISO 14726-1, Ships and marine technology — Identification colours for the contents of piping systems — Part 1:
Main colours and media
1)
ISO 14726-2 , Ships and marine technology — Identification colours for the contents of piping systems — Part 2:
Additional colours for different media and/or functions
ISO 15748-2, Ships and marine technology — Potable water supply on ships and marine structures — Part 2:
Method of calculation
SOLAS 1974, International Convention for the Safety of Life at Sea, 1974
3 Terms and definitions
For the purposes of this part of ISO 15748, the following terms and definitions apply.
3.1
potable water supply system
system for the generation, treatment, transfer, conveyance, storage, transport and distribution of potable water
3.2
water treatment plant
equipment for treating potable water whilst maintaining potable water properties, e.g. using filters, dosage plants,
ion exchangers, disinfecting plants
3.3
potable water heaters
appliances used to heat potable water without affecting its properties for consumption apart from a change in
temperature, e.g. continuous-flow water heaters, storage heaters
3.4
apparatus
collective term for technical installations making use of and/or transforming potable water
EXAMPLE
 distillation and sterilization apparatus;
 large-scale cooking equipment, dosage plant;
 pressurized water reservoirs, water heaters;
 dishwashers, coffee machines, as well as devices of all kinds forming part of the potable water system or connected
temporarily or permanently to it, except for supply and circulating pumps.
3.5
water
collective term for all types of water used for water supply

1) To be published
2 © ISO 2002 – All rights reserved

3.6
raw water
untreated water
NOTE Raw water and sea water are considered equivalent.
3.7
freshwater
water originally intended for human consumption and use on board as potable water but also used for certain
technical purposes and for sanitary-hygienic needs
3.8
potable water
water suitable for human consumption and use in compliance with the quality requirements laid down in the
applicable statutory provisions, defined in this part of ISO 15748 as:
a) water from a central public potable water supply;
b) water converted from sea water by evaporation at temperatures exceeding 80 °C;
c) water converted from sea water by evaporation at temperatures below 80 °C, and which has additionally been
sterilized;
d) water generated by reverse osmosis;
e) hot potable water heated in suitable water heaters.
3.9
cold water
cold potable water at temperatures between 5 °C and 25 °C
NOTE The upper temperature limit may be higher e.g. in the tropics.
3.10
hot water
hot potable water at temperatures between 50 °C and 90 °C, usually up to 60 °C
3.11
mixed water
hot and cold potable water mixed by means of a mixer tap
3.12
potable water line
pipeline exclusively carrying potable water
3.13
supply line
entire potable water pipeline system downstream of the discharge (supply) pump
3.14
water main
section of piping between the discharge pump and the point where the cold water line branches off from the line
leading to the central water heater
3.15
distribution line
section of the supply line downstream of the watermain
3.16
ring line
distribution line providing bidirectional water supply by way of loop-type installation
3.17
hot-water ring line
distribution line for unidirectional supply only with water circulation by means of a circulating pump to feed back
unused hot water to the water heater
3.18
circulating line
section of the cold/hot-water ring line without dispensing point, via which unused cold water is fed back to the
suction side of the supply pump or unused hot water is fed back to the water heater
3.19
trunk line
riser
vertical section of the supply line branching off from a distribution line
NOTE Deck lines and dispensing lines branch off from trunk lines.
3.20
deck line
section of the supply line branching off from the trunk line within one deck
3.21
service line
single feed line
section of the supply line leading from the deck line to the consumer
3.22
pump discharge line
discharge line downstream of the discharge outlet of a pump
3.23
pump return line
line through which water is fed to the pump
3.24
service fitting/
...