Ships and marine technology -- Drainage systems on ships and marine structures

ISO 15749-3:2004 applies to the design of sanitary drain lines in vacuum systems on ships and marine structures. For planning and basic requirements, see ISO 15749-1.

Navires et technologie maritime -- Installations de drainage sur navires et structures maritimes

General Information

Status
Published
Publication Date
28-Apr-2004
Current Stage
6060 - International Standard published
Start Date
18-Mar-2004
Completion Date
29-Apr-2004
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INTERNATIONAL ISO
STANDARD 15749-3
First edition
2004-05-01
Ships and marine technology —
Drainage systems on ships and
marine structures —
Part 3:
Sanitary drainage, drain piping for
vacuum systems
Navires et technologie maritime — Installations de drainage sur navires
et structures maritimes —
Partie 3: Drainage sanitaire, conduits de décharge au système de vide
Reference number
ISO 15749-3:2004(E)
ISO 2004
---------------------- Page: 1 ----------------------
ISO 15749-3:2004(E)
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© ISO 2004

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ii © ISO 2004 – All rights reserved
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ISO 15749-3:2004(E)
Contents Page

Foreword............................................................................................................................................................ iv

1 Scope...................................................................................................................................................... 1

2 Normative references ........................................................................................................................... 1

3 Terms and definitions........................................................................................................................... 2

4 Vacuum system..................................................................................................................................... 2

5 Pipes....................................................................................................................................................... 3

6 Fittings ................................................................................................................................................... 4

7 Laying of drain lines ............................................................................................................................. 5

8 Capacity of drain lines.......................................................................................................................... 7

9 Collector tank and sewage treatment plant........................................................................................ 7

10 Determination of air capacity............................................................................................................... 8

11 Testing and operation of pipelines ..................................................................................................... 9

12 Disposal ................................................................................................................................................. 9

13 System example .................................................................................................................................... 9

Annex A (informative) Example of a cleaning direction within an operating instruction for the

cleaning of a pipe system by pickling .............................................................................................. 11

Annex B (normative) Test methods................................................................................................................ 17

Bibliography ..................................................................................................................................................... 20

© ISO 2004 – All rights reserved iii
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ISO 15749-3:2004(E)
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 2.

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 document may be the subject of patent

rights. ISO shall not be held responsible for identifying any or all such patent rights.

ISO 15749-3 was prepared by Technical Committee ISO/TC 8, Ships and marine technology, Subcommittee

SC 3, Piping and machinery.

ISO 15749 consists of the following parts, under the general title Ships and marine technology — Drainage

systems on ships and marine structures:
— Part 1: Sanitary drainage-system design
— Part 2: Sanitary drainage, drain piping for gravity systems
— Part 3: Sanitary drainage, drain piping for vacuum systems
— Part 4: Sanitary drainage, sewage disposal pipes
— Part 5: Drainage of decks, cargo spaces and swimming pools
iv © ISO 2004 – All rights reserved
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INTERNATIONAL STANDARD ISO 15749-3:2004(E)
Ships and marine technology — Drainage systems on ships
and marine structures —
Part 3:
Sanitary drainage, drain piping for vacuum systems
1 Scope

This part of ISO 15749 applies to the design of sanitary drain lines in vacuum systems on ships and marine

structures.
For planning and basic requirements, see ISO 15749-1.
2 Normative references

The following referenced documents are indispensable for the application 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.

IMO Resolution A.753 (18), Guidelines for the application of plastic pipes on ships

ISO 65, Carbon steel tubes suitable for screwing in accordance with ISO 7-1

ISO 264, Unplasticized polyvinyl chloride (PVC) fittings with plain sockets for pipes under pressure — Laying

lengths — Metric series

ISO 4200, Plain end steel tubes, welded and seamless — General tables of dimensions and masses per unit

length

ISO 9329-1, Seamless steel tubes for pressure purposes — Technical delivery conditions — Part 1: Unalloyed

steels with specified room temperature properties

ISO 9330-1, Welded steel tubes for pressure purposes — Technical delivery conditions — Part 1: Unalloyed

steel tubes with specified room temperature properties.

ISO 15749-1, Ships and marine technology — Drainage systems on ships and marine structures — Part 1:

Sanitary drainage-system design

ISO 15749-4, Ships and marine technology — Drainage systems on ships and marine structures — Part 4:

Sanitary drainage, sewage disposal pipes
1) Published by International Maritime Organization, London.

Available from IMO Secretariat, Publications Section, 101-104 Piccadilly, London W1V, United Kingdom.

© ISO 2004 – All rights reserved 1
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ISO 15749-3:2004(E)
3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 15749-1 apply.

4 Vacuum system
4.1 Functional description
The vacuum drainage system operates as follows:

 wastewater is collected from water closets, urinals, and bidets or from other drainage items in branch

lines or manifolds;

 the wastewater is carried by means of the vacuum to a wastewater collector tank or a sewage treatment

plant.

The wastewater is evacuated in the form of a “plug” (sewage plug) owing to a pressure difference in the pipes

before and behind the plug.
4.2 Description
4.2.1 Drain lines in the vacuum system commence at the drain of a drainage item.

Vacuum-operated water closets have an integrated vacuum mechanism, other drainage items are connected

to a separate vacuum valve via a short non-vacuum line.
Drain lines in the vacuum system terminate at a vacuum-generating unit.

4.2.2 The wastewater is conveyed through pressure pipes from the vacuum generation unit to a collector

tank or sewage treatment plant.

NOTE The vacuum-generating unit may also be integrated into the collector tank or sewage treatment plant.

4.2.3 The sewage disposal pipes downstream of the collector tank or sewage treatment plant are not part of

the vacuum system.
For the design of these and other pressure pipes, ISO 15749-4 is applicable.

Figure 2 of this standard shows an example of a vacuum-operated drainage system with drain lines.

4.2.4 Depending on the ship type, its architecture, arrangement of ship's rooms and number of persons,

one, two or more vacuum sewage systems, which serve separate sections of a ship, can be provided.

4.3 Operating pressure

The operating pressure is between 0,4 bar and 0,7 bar absolute pressure (corresponding to a permissible

negative pressure of between − 0,3 bar and − 0,6 bar).
4.4 Drainage items
4.4.1 Vacuum-operated water closet

A water closet fitted with a mechanism for drain and flush valve control shall be provided.

The water volume for one flushing operation is approximately 1,2 litres.
2 © ISO 2004 – All rights reserved
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ISO 15749-3:2004(E)
4.4.2 Urinals and bidets

These sanitary drainage items do not have built-in vacuum mechanisms and shall therefore be connected to a

separate vacuum mechanism (vacuum valve) via connecting lines.
4.4.3 Washbasins and other drainage items

These sanitary drainage items do not have built-in vacuum mechanisms and shall therefore be connected to a

separate vacuum mechanism (vacuum valve) via connecting lines.
5 Pipes

Depending on the location, the following pipes shall be used for vacuum drain lines and vent lines:

 steel pipes in accordance with 5.1;

 steel pipes and CuNiFe pipes with spigot and socket joints, hereinafter referred to as spigot and socket

pipes;
 CuNiFe pipes in accordance with 5.3;

 PVC-U pipes in accordance with 5.4; plastic pipes shall be approved in accordance with IMO-Resolution

A.753 (18);

 pipes with low flame spread and smoke emission properties are at the discretion of the classification

society.
For nominal bores see Table 1.
Table 1 — Nominal bores for drain lines
Type of pipe Steel and CuNiFe pipes PVC-U and spigot and socket pipes
40 40
Nominal bore, NB
50 50
100 —
5.1 Steel pipes
The following types of pipes are applicable:
 seamless steel pipes in accordance with ISO 4200 and ISO 9329-1, of S 235 JR;
 welded steel pipes in accordance with ISO 4200 and ISO 9330-1, of S 235 JR;
 threaded pipes in accordance with ISO 65, of S 185.
For outside diameter and wall thickness see Table 2.
© ISO 2004 – All rights reserved 3
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ISO 15749-3:2004(E)
Table 2 — Dimensions of steel pipes
Outside diameter, d Wall thickness, s
min
Nominal bore, NB
mm mm
40 48,3 2,3
50 60,3 2,3
100 114,3 3,2
5.2 Spigot and socket pipes

Spigot and socket pipes with dimensions in accordance with Table 3 are applicable. Also, CuNi10Fe1,6Mn

pipes with these dimensions are applicable.
Table 3 — Dimensions of spigot and socket pipes
Outside diameter, d Wall thickness, s
min
Nominal bore, NB
40 42 1,4
50 53 1,4
5.3 CuNiFe pipes
CuNi10Fe1,6Mn pipes with dimensions in accordance with Table 4 are applicable.
Table 4 — Dimensions of CuNiFe pipes
Wall thickness, s
Outside diameter, d
min
Nominal bore, NB
40 44,5
50 57
5.4 PVC-U pipes
Pipes with dimensions in accordance with Table 5 are applicable.
Table 5 — Dimensions of PVC-U pipes
Wall thickness, s
Outside diameter, d
min
Nominal bore, NB
40 50 3,7
50 63 4,7
6 Fittings
6.1 Requirements

Fittings shall be suitable for vacuum use in accordance with 4.3. Shut-off valves shall provide smooth passage.

4 © ISO 2004 – All rights reserved
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ISO 15749-3:2004(E)
6.2 Testing
Testing for tightness is specified in B.2.
7 Laying of drain lines
7.1 Line routing

In accordance with ISO 15749-1, vacuum drain lines may run in any direction. However, changes in direction

at short intervals should be avoided.
7.2 Horizontal laying
7.2.1 Gradient

Horizontally laid piping should have a slight gradient (approximately 2:1 000) towards the point of suction.

7.2.2 Water traps

Water traps shall be integrated into horizontally installed pipes at distances of not more than 40 m,

immediately before riser branches.
7.3 Connecting lines

Non-vacuum lines connecting drainage units to vacuum valves shall have an adequate gradient of not less

than 2:1 000. Unimpeded supply with venting of the line, if required, shall be ensured.

7.4 Riser branches

7.4.1 Not more than three vacuum toilets or vacuum valves may be connected to one riser branch, all of

which shall be located on the same deck. The length of the riser branch shall not exceed one deck height

(max. 3 m). Longer branches should be subject to the manufacturer's consent.

NOTE It is assumed that the max. three items will not be operated simultaneously.

7.4.2 If only one vacuum toilet or vacuum valve is connected, the riser branches may pass through more

than one deck, provided a horizontal conduit with a safety device against back flow is installed on each deck.

See Figure 2.

7.4.3 Immediately before the riser branch feeds into the horizontal manifold, a vacuum no-return fitting

should be installed above the manifold, unless there is an elevation of the line of 3 × d at the inlet.

7.4.4 If a collecting pipeline feeds into the horizontal manifold from above, a device preventing back flow

should be installed just before the connection of a riser branch to the manifold.

7.5 Feeding pipes

The angle at which pipes feed into manifolds in the direction of flow shall not exceed 45°. Tees and 90°

elbows may not be used. Connections from below, or located opposite to each other, are not permitted (see

examples in Figure 1). The internal surface at the connections shall be smooth.
© ISO 2004 – All rights reserved 5
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ISO 15749-3:2004(E)
Figure 1 — Feeding pipes
7.6 Pipe elbows

The radius of bends in pipes shall not be less than three times the outer pipe diameter.

7.7 Cleaning openings

Cleaning openings shall be provided in pipe sections of drain lines which cannot be cleaned otherwise.

7.7.1 Cleaning openings in steel pipes
The following shall be provided:
 branch pipes with hex-head screw plugs; or
 blank flanges; or
 ball valves (arranged where frequent cleaning can be expected).
7.7.2 Cleaning openi
...

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