ISO 21885:2019

INTERNATIONAL ISO
STANDARD 21885
First edition
2019-04
Ships and marine technology — Testing
specification for stairsteps using
electrical resistance trace heating
Reference number
©
ISO 2019
© ISO 2019
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ii © ISO 2019 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Construction and materials . 1
5 Test method . 2
5.1 Test purpose . 2
5.2 Test facility requirements . 2
5.3 Test conditions . 2
5.3.1 General. 2
5.3.2 Test temperature . 2
5.3.3 Test wind . 3
5.4 Test specimen requirements . 3
5.4.1 General requirement . 3
5.4.2 Shape . 3
5.4.3 Installation method . 4
5.5 Test procedures . 4
5.5.1 General. 4
5.5.2 Test procedure — Option 1. 4
5.5.3 Test procedure — Option 2. 5
5.6 Pass/fail criteria . 7
5.7 Test report . 7
Bibliography . 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 2019 – All rights reserved

INTERNATIONAL STANDARD ISO 21885:2019(E)
Ships and marine technology — Testing specification for
stairsteps using electrical resistance trace heating
1 Scope
This document specifies a test method to assess the performance of stairsteps using electrical resistance
trace heating to provide anti-icing in low temperature environments, when installed for exterior
applications. It includes requirements for the test facility, the test conditions, the test specimens, the
test procedures and the test report.
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.
IEC/IEEE 60079-30-1, Explosive atmospheres — Part 30-1: Electrical resistance trace heating — General
and testing requirements
IEC/IEEE 60079-30-2, Explosive atmospheres — Part 30-2: Application guide for design, installation and
maintenance
3 Terms and definitions
For the purposes of this document, the following terms and definitions 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
heated stairstep
stairstep that can be heated through a heating device on the stairstep to prevent falling accidents
3.2
anti-icing
prevention of ice formation on protected surfaces
3.3
ambient temperature
temperature of the air in the test chamber
4 Construction and materials
Stairsteps should be designed and constructed using materials that withstand the foreseeable
conditions of use. In particular, at least the following details shall be considered:
a) dimensioning and selection of components (including fixings, connections, supports and
foundations) shall ensure sufficient rigidity and stability;
b) all parts shall be resistant to environmental effects (such as due to climate, chemical agents,
corrosive gases) e.g. by the use of a corrosion resistant material or with the aid of a suitable
protective coating;
c) heated stairsteps that contain heat tracing and are installed in hazardous ar
...