ISO 24319:2022

INTERNATIONAL ISO
STANDARD 24319
First edition
2022-06
Ships and marine technology —
Design and test requirements for
small steel hatches using electrical
trace heating
Reference number
ISO 24319:2022(E)
© ISO 2022

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ISO 24319:2022(E)
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© ISO 2022
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Published in Switzerland
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ISO 24319:2022(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Design . 2
4.1 Structure . 2
4.1.1 Types of heated small steel hatches . 2
4.1.2 Sealing rubber stripe . 6
4.1.3 Other . 6
4.2 Performance . 6
4.2.1 Weather-tightness . 6
4.2.2 Anti-icing . 6
5 Materials . 6
5.1 Hatch cover . 6
5.2 Trace heater cable . 7
6 Quality of manufacture .8
6.1 Appearance . 8
6.2 Anti-rust and surface treatment . . 8
6.3 Installation of trace heater cable. 8
7 Test . 8
7.1 Weather tight test . 8
7.1.1 Flushing test . 8
7.2 Anti-icing test . 8
7.2.1 Test purpose . 8
7.2.2 Test device . 8
7.2.3 Test condition . 9
7.2.4 Test procedure. 10
7.2.5 Pass/fail criteria . 10
8 Designation .10
Annex A (informative) Nominal dimension, closing device and hinge position arrangement
of heated small steel hatches .12
Annex B (informative) Type selection for trace heater cable and layout of trace heating
device .14
Bibliography .16
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ISO 24319:2022(E)
Foreword
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This document was prepared by Technical Committee ISO/TC 8, Ships and marine technology,
Subcommittee SC 8, Ship design.
Any feedback or questions on this document should be directed to the user’s national standards body. A
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INTERNATIONAL STANDARD ISO 24319:2022(E)
Ships and marine technology — Design and test
requirements for small steel hatches using electrical trace
heating
1 Scope
This document specifies the design, materials, quality of manufacture, test and designation of electrical
trace heating for small steel hatches onboard vessels sailing in low temperature environments (below
−10 °C).
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 8501-1, Preparation of steel substrates before application of paints and related products — Visual
assessment of surface cleanliness — Part 1: Rust grades and preparation grades of uncoated steel substrates
and of steel substrates after overall removal of previous coatings
IACS UR S26, Strength and Securing of Small Hatches on the Exposed Fore Deck
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
heated small steel hatch
hatch made of steel installed onboard vessels, sailing in low temperature environments (3.4), enabling
people to open normally by adding heat through the trace heater cable (3.3)
3.2
trace heater
device designed for the purpose of producing heat on the principle of electrical resistance and typically
composed of one or more metallic conductors or an electrically conductive material, suitably electrically
insulated and protected
Note 1 to entry: This can be in the form of a trace heater cable (3.3), heater panel or heated pad.
[SOURCE: IEC 60519-10:2013, 3.115]
3.3
trace heater cable
circular to flattened cable shaped construction with one or more discrete or continuous electrically
insulated heating elements
Note 1 to entry: This cable is able to self-regulate its heating output power due to ambient temperature.
[SOURCE: IEC 60519-10:2013, 3.116]
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ISO 24319:2022(E)
3.4
low temperature environment
water with the lowest mean daily low temperature below −10 °C, such as the Arctic Ocean, St. Francis
Bay, North Baltic, Okhotsk, Bohai and North Yellow Sea
Note 1 to entry: In general, these waters are covered by regional sea ice during winter.
[2]
[SOURCE: IMO MSC.385 (94), 1.2.12 , modified]
4 Design
4.1 Structure
4.1.1 Types of heated small steel hatches
The heated small steel hatches are classified into three types, as shown in Table 1 and from Figure 1 to
Figure 3.
Table 1 — Types of heated steel hatches
Type Definition
A heated small steel hatch whose locking mode is butterfly nut open
B heated small steel hatch whose locking mode is wedge handle open
C heated small steel hatch whose locking mode is hand wheel linkage open
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ISO 24319:2022(E)
Key
1 coaming 6 wing nut clamp (typical shape)
2 electrical self-regulating trace heating cable 7 press plate
3 protect housing 8 cover
4 metal load-bearing plate B breadth
5 sealing rubber stripe L length
NOTE This figure is only a typical form, and the closing devices are determined according to the specification
of the heated small steel hatch. For the closing devices and hinges position arrangement, refer to Annex A.
Figure 1 — Type A
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ISO 24319:2022(E)
Key
1 coaming 6 sealing rubber stripe
2 wedge 7 cover
3 protect housing 8 wedge handle
4 electrical self-regulating trace heating cable B breadth
5 metal load-bearing plate L length
NOTE This figure is only a
...