ISO 7613:2025

International
Standard
ISO 7613
First edition
Ships and marine technology —
2025-03
Hopper dredger — Suction tube
position monitor
Reference number
© ISO 2025
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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
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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) signal collecting and processing unit;
g) display and output unit.
5.2 Interface
The STPM shall include a tide data interface. The STPM interface shall be integrated in the HD-SCS.
6 Requirements
6.1 General
The STPM can operate as an independent system or can be integrated in the HD-SCS.
The STPM shall meet the requirements of operating position and control mode specified in ISO 20662:2020, 5.1.
The STPM shall meet the requirements of human machine interface (HMI) graphics specified in
ISO 20662:2020, 5.4.
6.2 Function
6.2.1 Tide
The STPM should have one or more of the following tide input methods:
a) inputting from the tide table;
b) manually inputting the actual tide;
c) using the tide gauge to receive re
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