ISO 7613:2025

Ships and marine technology - Hopper dredger - Suction tube position monitor

This document specifies the components, interface, technical requirements and test methods of the suction tube position monitor (STPM). It is applicable only to the installed components, functions or systems. This document covers the design, manufacture and modifications of the suction tube position monitor.

Titre manque

General Information

• Status: Published
• Publication Date: 19-Mar-2025
• ICS: 47.020.99 - Other standards related to shipbuilding and marine structures
• Technical Committee: ISO/TC 8 - Ships and marine technology
• Drafting Committee: ISO/TC 8 - Ships and marine technology
• Current Stage: 6060 - International Standard published
• Start Date: 20-Mar-2025
• Due Date: 21-Apr-2025
• Completion Date: 20-Mar-2025

Overview

ISO 7613:2025 - Ships and marine technology - Hopper dredger - Suction tube position monitor (STPM) standardizes the design, components, interfaces, technical requirements and test methods for suction tube position monitors installed on hopper dredgers. It covers the installed system elements, functional and performance requirements, enclosure and power-supply criteria, and verification/test procedures (function, performance and enclosure tests).

Key topics and technical requirements

• System scope and integration

  • Applicable to installed STPM components and systems; can operate stand‑alone or be integrated into a Hopper Dredger Supervisory and Control System (HD‑SCS) and SCADA.
  • Includes a tidal-data interface and adherence to human‑machine interface (HMI) graphics per ISO 20662.

• Core components

  • Suction tube posture measurement sensors
  • Suction tube inlet draught and inlet sensors
  • Gantry and winch posture/position sensors
  • Swell compensator stroke and pressure sensors
  • Signal collecting & processing unit; display/output unit
  • Suction tube winch controller (STWC) for coordinated movement/control

• Functional requirements

  • Tide input (tide table, manual input, or tide gauge)
  • Parameter presets (tube length, draghead/gimbal sizes, sensor parameters)
  • Operation controls: hoisting/lowering, gantry/winch control, visor angle, swell compensator regulation
  • Visualization: continuous SCADA display of 2D/3D views, target/current depths, distances, visor angle, winch speed, system statuses and limits
  • Alarms and recording: defined alarm conditions for unsafe depths, distances and angles; alarm display and recording on SCADA
  • Calibration and diagnostics: vertical/horizontal calibration routines, manual depth calibration and diagnostic outputs for gantries, winches, swell compensator and active draghead

• Performance

  • Accuracy: maximum permissible error ±0.15 m for draghead depths from 0–30 m; a depth‑dependent error is specified for depths >30 m (see ISO 7613 for exact formula).
  • Planar position error: ±0.25 m in ship coordinates.
  • Data recording: interval ≤2 s, storage for at least 24 h continuous recording, data replay available.

• Enclosure & power

  • Enclosure IP requirements per IEC 60529: IP68 for submersible items, IP56 for deck outdoor equipment, IP20 for console devices.
  • Power: main and standby feeds; servers/workstations/switches on UPS with fail‑safe operation and at least 30 minutes autonomy.

• Verification

  • Functional and performance test methods provided (Annex A and B, informative) plus enclosure tests per IEC 60529 methods.

Applications - who uses this standard

• Dredging vessel designers and shipyards specifying STPM systems
• STPM and sensor manufacturers and system integrators
• Vessel operators and dredging contractors seeking reliable depth control and safety
• Classification societies, marine surveyors and procurement teams for compliance and acceptance testing
• HD‑SCS/SCADA integrators and maintenance teams for diagnostics and lifecycle upgrades

Related standards

• ISO 20662:2020 - Ships and marine technology - Hopper dredger supervisory and control systems
• IEC 60529 - Degrees of protection provided by enclosures (IP code)

For full technical details, test procedures and the exact depth‑dependent accuracy formula, consult the complete ISO 7613:2025 document from ISO.

Standards Content (Sample)

International
Standard
ISO 7613
First edition
Ships and marine technology —
2025-03
Hopper dredger — Suction tube
position monitor
Reference number
© ISO 2025
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
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Abbreviated terms . 2
5 Components and interface . 2
5.1 Components .2
5.2 Interface .3
6 Requirements . 3
6.1 General .3
6.2 Function .3
6.2.1 Tide .3
6.2.2 Parameter preset .3
6.2.3 Operation .3
6.2.4 Controller .4
6.2.5 Visualization .4
6.2.6 Alarm .4
6.2.7 Calibration . . .4
6.2.8 Diagnostic .4
6.3 Performance .5
6.3.1 Maximum permissible error .5
6.3.2 Maximum plane position error .5
6.3.3 Data record and replay .5
6.4 Enclosure .5
6.5 Power supply .5
7 Test methods . 6
7.1 Function .6
7.2 Performance .6
7.3 Enclosure .6
Annex A (informative) Function test methods . 7
Annex B (informative) Performance test methods . 9

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 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.
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 cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
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.
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.

iv
Introduction
There are many system integrators for the suction tube position monitor, with significant product
differences, varying quality, and no applicable standards. These factors seriously affect the quality of
dredging and are problematic for ship construction management and system upgrades, having even given
rise to safety hazards in operation.
The aim of this document is to standardize the components, interface, functions, performance and testing
methods of the system, thereby reducing communication costs at various stages and improving the quality
and efficiency of dredging.
v
International Standard ISO 7613:2025(en)
Ships and marine technology — Hopper dredger — Suction
tube position monitor
1 Scope
This document specifies the components, interface, technical requirements and test methods of the suction
tube position monitor (STPM).
It is applicable only to the installed components, functions or systems. This document covers the design,
manufacture and modifications of the suction tube position monitor.
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 20662:2020, Ships and marine technology — Hopper dredger supervisory and control systems
IEC 60529, Degrees of protection provided by enclosures (IP code)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
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/
3.1
chart depth of draghead
distance from the chart datum to the lower edge of the draghead
3.2
depth of draghead
distance from the water surface to the lower edge of the draghead
3.3
datum point of draghead
midpoint of intersection line between the horizontal profile of suction tube axis and the vertical profile of
draghead visor trunnion
Note 1 to entry: See Figure 1.
3.4
vertical deviation of draghead
vertical distance from the datum point of draghead (3.3) to the lower edge point of draghead
Note 1 to entry: See Figure 1.

3.5
simulated signal source
device which simulates the output signal of sensors, such as DC voltage, DC current and digital output
Key
1 vertical profile of draghead visor trunnion
2 horizontal profile of suction tube axis
3 datum point of draghead
4 projection point of the datum point of draghead on the side surface of draghead
5 lower edge point of draghead
6 vertical deviation of draghead
Figure 1 — View of draghead
4 Abbreviated terms
HD-SCS hopper dredger supervisory and control system
SCADA supervisory control and data acquisition
STPM suction tube position monitor
STWC suction tube winch controller
5 Components and interface
5.1 Components
The STPM shall include the following equipment:
a) suction tube posture measurement sensors;

b) suction tube inlet draught sensor;
c) suction tube at the inlet sensor;
d) sensors for detecting the posture and position of the suction tube gantry and winch;
e) stroke and pressure sensors of the swell compensator;
f) si
...