ISO 5483:2023

Ships and marine technology - Drain facilities from oil and water tanks

This document specifies the dimensions and materials for welding rings and drain screws of drain facilities situated at the bottom of oil and water tanks. Oil and water tanks occur as: - built-in tanks, as an integrated part of the hull structure; and - detachable tanks, located in appropriate rooms and compartments. This document covers facilities for both instances.

Titre manque

General Information

• Status: Published
• Publication Date: 15-Aug-2023
• ICS: 47.020.30 - Piping systems
• Technical Committee: ISO/TC 8/SC 3 - Piping and machinery
• Drafting Committee: ISO/TC 8/SC 3 - Piping and machinery
• Current Stage: 6060 - International Standard published
• Start Date: 16-Aug-2023
• Due Date: 03-Feb-2024
• Completion Date: 16-Aug-2023

Relations

• Revises: ISO 5483:2003 - Ships and marine technology - Drain facilities from oil and water tanks
• Effective Date: 06-Jun-2022

Overview

ISO 5483:2023 - Ships and marine technology - Drain facilities from oil and water tanks - specifies the dimensions and materials for welding rings and drain screws used in drain facilities located at the bottom of oil and water tanks. The standard applies to both built‑in tanks (integrated in hull structure) and detachable tanks (located in rooms/compartments). It defines four mounting arrangements (Type A, B, C and D) and includes requirements for assembly, threads, materials, welding and marking.

Key topics and technical requirements

• Drain facility types: Designation and intended use of Type A (universal, flush mounting for thin plating), Type B and C (alternative mountings) and Type D (for jack‑up platforms and special flush mounting).
• Assembly and mounting: General assembly arrangements and main dimensions for each type, plus mounting drawings and parts lists covering welding rings, drain screws and gaskets.
• Threads and tolerances: Threads for all types must comply with ISO screw‑thread standards (ISO 68‑1, ISO 261 and ISO 965 series). Non‑toxic anti‑seize on threads is noted as acceptable.
• Materials: Materials for welding rings, drain screws and gaskets are specified. The standard references shipbuilding steels, corrosion‑resistant stainless steels, PTFE, chloroprene rubber and appropriate copper/lead alloys as suitable choices for oil and water tank applications.
• Welding and quality: Welding sequence illustrations and the requirement that welding complies with classification society rules.
• Marking and opening: Requirements for marking and location (including special provisions for Type D) and methods for opening drain facilities (tools and wrench types are covered, with informative Annex A).

Practical applications and users

ISO 5483:2023 is intended for professionals involved in the design, fabrication, installation, inspection and maintenance of shipboard tanks and drainage systems, including:

• Shipbuilders and ship repair yards
• Naval architects and marine engineers
• Tank and fitting manufacturers (welding rings, drain screws, gaskets)
• Classification societies and surveyors ensuring compliance
• Offshore platform designers and operators (jack‑up platform applications)

Use cases include specifying drain fittings for newbuild vessels, retrofitting or replacing tank drains, preparing procurement specifications, and verifying conformity during surveys.

Related standards

Normative references in ISO 5483:2023 include:

• ISO 68‑1, ISO 261, ISO 965‑1/‑2/‑3 (metric screw threads and tolerances)
• ISO 2768‑1 (general tolerances)
• ISO 16143‑1 (stainless steels for general purposes)

ISO 5483:2023 keywords: ISO 5483:2023, drain facilities, welding ring, drain screw, oil tanks, water tanks, ships, marine technology, tank drains, mounting types A B C D.

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 5483
Third edition
2023-08
Ships and marine technology — Drain
facilities from oil and water tanks
Reference number
© ISO 2023
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Designation . 1
5 General assembly arrangement . 2
5.1 Assembly . 2
5.2 Threads . 5
5.3 Materials . 5
6 Mounting. 5
6.1 Type A . 5
6.2 Type B . 6
6.3 Type C . 9
6.4 Type D . 10
6.5 General for all types . .12
7 Welding ring .12
7.1 Welding ring — Type A .12
7.2 Welding ring — Type B . 14
7.3 Welding ring — Type C .15
7.4 Welding ring — Type D . 17
8 Drain Screws .19
8.1 For water tanks — Type A . 19
8.2 For water tanks — Type B . 20
8.3 For water tanks — Type C . 21
8.4 For water tanks — Type D . 23
8.5 For oil tanks — Type A .25
8.6 For oil tanks — Type B .26
8.7 For oil tanks — Type C.28
8.8 For oil tanks — Type D .29
9 Marking and location .31
9.1 Marking for Type A, Type B and Type C . 31
9.2 Marking for Type D . 32
10 Opening of drain facilities .33
Annex A (informative) Type of wrench .34
iii
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
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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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use
of (a) patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed
patent rights in respect thereof. As of the date of publication of this document, ISO had not received
notice of (a) patent(s) which may be required to implement this document. However, implementers are
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Any trade name used in this document is information given for the convenience of users and does not
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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 8, Ships and marine technology,
Subcommittee SC 3, Piping and machinery.
This third edition cancels and replaces the second edition (ISO 5483:2003), which has been technically
revised.
The main changes are as follows:
— the normative references have been updated;
— Clause 3 has been added;
— in Clause 4, Type C and Type D for jack-up platform have been added;
— in Clause 5, the general arrangement and parts list for Type C and Type D have been added;
— in Clause 6, mounting and main dimensions for Type C and Type D assembly have been added;
— Figure 6 has been moved to 6.5;
— in Clause 7, designations for welding rings in Type C and Type D have been added;
— in Clause 8, details for Type C and Type D drain screws in water tanks and oil tanks have been
added;
— in Clause 9, marking has been updated and added for Type D;
— in Clause 10, opening methods for drain facilities have been added;
— Annex A has been added.
iv
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.
v
INTERNATIONAL STANDARD ISO 5483:2023(E)
Ships and marine technology — Drain facilities from oil
and water tanks
1 Scope
This document specifies the dimensions and materials for welding rings and drain screws of drain
facilities situated at the bottom of oil and water tanks.
Oil and water tanks occur as:
— built-in tanks, as an integrated part of the hull structure; and
— detachable tanks, located in appropriate rooms and compartments.
This document covers facilities for both instances.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements 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.
ISO 68-1, ISO general purpose screw threads — Basic profile—Part 1:Metric screw threads
ISO 261, ISO general purpose metric screw threads — General plan
ISO 965-1, ISO general purpose metric screw threads — Tolerances — Part 1: Principles and basic data
ISO 965-2, ISO general purpose metric screw threads — Tolerances — Part 2: Limits of sizes for general
purpose external and internal screw threads — Medium quality
ISO 965-3, ISO general purpose metric screw threads — Tolerances — Part 3: Limit deviations for screw
threads
ISO 2768-1, General tolerances — Part 1: Tolerances for linear and angular dimensions without individual
tolerance indications
ISO 16143-1, Stainless steels for general purposes — Part 1: Corrosion-resistant flat products
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
4 Designation
For the purposes of this document, four types of drain facilities are covered:
— Type A, which is universally applicable, especially where flush mounting with the outer surface of
hull plating at plate thickness is less than 38 mm;
— Type B and Type C, which are usable in other instances where the Type A is not applicable;
— Type D, which is used in jackup platforms where flush mounting with the outer surface of hull
plating.
NOTE Type A, B, C and D arrangements are identified by the following two categories of drain screws:
— square wrench connection for water tanks, and
— hexagonal wrench connection for oil tanks.
5 General assembly arrangement
5.1 Assembly
For Type A, refer to Figure 1 and Table 1. For Type B, refer to Figure 2 and Table 2. For Type C, refer to
Figure 3 and Table 3.
For Type D, refer to Figure 4 and Table 4.
Dimensions in millimetres
Key
1 welding ring
2 drain screw
3 gasket
a
Inner side of bottom plate.
NOTE The extreme left and right sections represent hull plating.
Figure 1 — General arrangement for Type A
Table 1 — Parts list for Type A
Dimensions in millimetres
Part no. Part name Size
1 Welding ring
M42 × 2
2 Drain screw
M72 × 3
3 Gasket —
Key
1 welding ring
2 drain screw
3 gasket
a
Inner side of bottom plate.
NOTE The extreme left and right sections represent hull plating.
Figure 2 — General arrangement for Type B
Table 2 — Parts list for Type B
Dimensions in millimetres
Part no. Part name Size
1 Welding ring 15
M42 × 2
2 Drain screw
M72 × 3
3 Gasket —
Key
1 welding ring
2 drain screw
3 gasket
a
Inner side of bottom plate.
NOTE The extreme left and right sections represent hull plating.
Figure 3 — General arrangement for Type C
Table 3 — Parts list for Type C
Dimensions in millimetres
Part no. Part name Size
1 Welding ring 45
M42 × 2
M52 × 2
2 Drain screw
M62 × 2
M72 × 3
3 Gasket —
Key
1 welding ring
2 drain screw
3 gasket
a
Inner side of bottom plate.
NOTE The extreme left and right sections represent hull plating.
Figure 4 — General arrangement for Type D
Table 4 — Parts list for Type D
Dimensions in millimetres
Part No. Part name Size
1 Welding ring 45
M42 × 2
M52 × 2
2 Drain screw
M62 × 2
M72 × 3
3 Gasket —
5.2 Threads
For all types, the threads shall be accordance with ISO 68-1, ISO 261 and ISO 965-1, ISO 965-2 and
ISO 965-3.
NOTE A non-toxic anti-seize compound grease can be used on the thread surfaces.
5.3 Materials
The welding ring, drain screw and gasket materials shall be as given in Table 5. Other materials shall be
of equivalent quality and in all respects suitable for the intended purpose.
Table 5 — Material list for all types
Component Material Designation
Steel shall be of similar quality as surrounding
Welding ring Shipbuilding steel
tank bottom steel plating.
Stainless steel ISO 16143-1
Drain screw
Copper-aluminium alloy —
Polytetrafluoroethylene (PTFE) —
Chloroprene rubber Ballast tanks and fresh water tanks
Gasket
Lead Oil tanks
Red copper —
6 Mounting
6.1 Type A
For Type A mountings, see Figure 5 and Table 6.
Dimensions in millimetres
Key
1 welding ring
2 drain screw
3 gasket
a
Inner side of bottom plate.
Figure 5 — Type A mounting
Table 6 — Main dimensions for Type A assembly
Dimensions in millimetres
Size
Hole size of hull plate Thickness of hull plate
Type
D t
D 3
162 A-1 165 t ≤ 27,5
350 A-2 353 27,5 < t ≤ 38
6.2 Type B
For Type B mountings, see Figures 6, 7 and 8 and Table 7.
Dimensions in millimetres
Key
1 welding ring
2 drain screw
3 gasket
R3 dimension of the fillet, 3 mm
a
Inner side
...