ISO 24041:2020

INTERNATIONAL ISO
STANDARD 24041
First edition
2020-12
Ships and marine technology — Shark
jaws and towing pins
Navires et technologie maritime — Broches d'entraînement et
stoppeurs "shark jaws"
Reference number
©
ISO 2020
© ISO 2020
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ii © ISO 2020 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Types . 2
4.1 Types of shark jaws . 2
4.2 Structural form of shark jaws and towing pins . 2
5 Design . 3
5.1 Material stresses . 3
5.2 Basic calculation . 4
5.3 Shark jaw design . 5
5.4 Towing pin design . 5
5.5 Support box design . 5
5.6 Lubrication design . 5
5.7 Auxiliary equipment . 5
5.8 Working time control . 6
5.9 Emergency release . 6
6 Performance specifications . 6
6.1 Load requirements . 6
6.2 Working time . 7
7 Acceptance tests . 7
7.1 General requirement . 7
7.2 Operation without load . 7
7.3 Operation under load . 7
7.4 Control system utility test . 8
7.5 Emergency release test . 8
7.6 Waterproof test . 8
8 Designation system . 8
Foreword
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This document was prepared by Technical Committee ISO/TC 8, Ships and marine technology,
Subcommittee SC 4, Outfitting and deck machinery.
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iv © ISO 2020 – All rights reserved

INTERNATIONAL STANDARD ISO 24041:2020(E)
Ships and marine technology — Shark jaws and towing pins
1 Scope
This document specifies requirements for the design, operation, performance and acceptance tests of
marine shark jaws and towing pins having electric, hydraulic, diesel or steam drive.
It is applicable to the design, manufacture and acceptance of marine shark jaws and towing pins.
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 3828, Shipbuilding and marine structures — Deck machinery — Vocabulary and symbols
ISO 7365, Shipbuilding and marine structures — Deck machinery — Towing winches for deep sea use
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 3828 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
shark jaw
equipment for temporarily securing the inboard end of a towline
Note 1 to entry: A left-hand shark jaw is a shark jaw placed on the left-hand side of the central axis of the towing
pins (3.2) when looking at the bow from the stern of a ship.
Note 2 to entry: A right-hand shark jaw is a shark jaw placed on the right-hand side of the central axis of the
towing pins (3.2) when looking at the bow from the stern of a ship.
Note 3 to entry: A central shark jaw is a shark jaw placed on the central axis of the towing pins (3.2) when looking
at the bow from the stern of a ship.
3.2
towing pin
equipment for leading and restraining a towline to the intended path
3.3
support box
device fixing and supporting the shark jaw (3.1) and towing pins (3.2)
3.4
working height
maximum height from a towline to the board, when shark jaws (3.1) or towing pins (3.2) operate
normally
3.5
emergency release
release and withdrawal actions of a shark jaw (3.1) and towing pins (3.2) depending on standby power
under loss of driving power or in emergency
3.6
fork shark jaw
shark jaw (3.1) with clamp forks on top, which have clamping devices inside that can seize the lock
chains or steel wire rope clips, and with a cylindrical under part enabling a vertical slice movement
within the support box (3.3)
Note 1 to entry: The clamping device on the clamp fork of a fork shark jaw can be replaced to adapt to different
types of steel wire ropes or lock chains for fixture.
3.7
triplex shark jaw
shark jaw (3.1) with two independently rev
...