ISO 19891-1:2017

Overview

ISO 19891-1:2017 defines specifications for portable gas detectors used aboard ships for atmosphere testing of enclosed spaces prior to entry. Aligned with SOLAS regulation XI-1/7, the standard sets out required measurement gases, performance criteria, environmental protection, and testing requirements to help ship operators and procurement teams select detectors suitable for enclosed-space safety checks.

Key features of the standard include: clear marking of measurable gases, self-test and calibration procedures, portability and battery operation, and requirements for protection against shock, temperature and water ingress. The standard also identifies methane or propane/butane as the representative flammable gases and notes iso-butane as an alternative calibration gas for propane/butane measurements.

Key Topics

• Gases to be measured: Oxygen, flammable gases/vapours (represented by methane or propane/butane), hydrogen sulphide (H2S) and carbon monoxide (CO). Additional toxic gases may be required by flag State Administrations.
• Performance and accuracy: Oxygen detectors shall have an accuracy of at least ±1% by volume in air (0 °C to 40 °C). Default alarm recommendations include 18% O2 (if not set by Administration) and 30% of LFL for flammable gases (if Administration does not specify). H2S default alarm 10 ppm where not otherwise determined.
• Measurement method: Detectors must sample and measure atmospheres from outside enclosed spaces without entry, and conform to response time requirements when using suction hoses or remote sampling in accordance with referenced IEC documents.
• Design and usability: Portable instruments must be easily carried, battery-operated with a minimum 10-hour operating capability, display measured concentrations, provide clear visual and audible alarms, perform self-tests on activation, and include documented re-calibration procedures.
• Modularity: Multi-gas instruments may use permanently installed sensors or external replaceable modules; modules must be clearly marked and accompanied by mounting/dismounting instructions and unique identifiers.

Applications

ISO 19891-1:2017 is practical for:

• Ship operators and safety officers procuring portable atmosphere testers to comply with SOLAS XI-1/7.
• Shipyards, flag State administrations and maritime inspectors evaluating detector suitability and marking claims.
• Crews performing pre-entry atmosphere checks of cargo tanks, cargo pump-rooms, void spaces, ballast tanks and other enclosed spaces.

Benefits include improved consistency in detector selection, clearer marking and documentation of sensor capability, and alignment with IMO and SOLAS requirements for enclosed-space safety.

Related Standards

Key normative references and related documents referenced by ISO 19891-1:2017:

• IEC 60079-0, IEC 60079-29-1, IEC 60079-29-2 (explosive atmospheres and gas detector performance/selection)
• IEC 60529 (IP protection), IEC 60092-504 (ship electrical installations)
• IMO Resolution A.1050(27) (recommendations for entering enclosed spaces)
• SOLAS regulation XI-1/7 (Atmosphere testing instrument for enclosed spaces)

Keywords: ISO 19891-1:2017, portable gas detectors, SOLAS XI-1/7, enclosed spaces, oxygen, methane, propane, butane, hydrogen sulphide, carbon monoxide, LFL, calibration.