Overview
ISO 22554:2023 - Ships and marine technology - Propeller shaft revolution indicators (electric type and electronic type) defines construction, performance requirements, testing methods and required test results for propeller shaft revolution indicators. The standard aligns with SOLAS 1974 (Reg. 19, Ch. V) and is intended to be used alongside IMO Resolution A.694(17) and IEC 60945. It covers both electric-type (generator-driven) and electronic-type (sensor and signal-converter) indicator systems and notes that such indicators can be designed to also meet engine tachometer requirements.
Key topics and requirements
ISO 22554:2023 addresses the full lifecycle of an indicator system, including:
- Construction: Robust enclosures, grounding/earthing requirements, and provisions for easy maintenance. Systems may be self-contained or integrated into other equipment. Both analogue and digital indication types are covered.
- Transmitters & sensors: Requirements for generator-driven (electric) transmitters and pulse-detecting (electronic) revolution sensors plus signal converters.
- Indicators: Requirements for analogue (pointer/scale) and digital (alphanumeric) displays, including digital presentation on shipborne navigational displays where applicable.
- Alerts and bridge integration: Alert functionality and compatibility with bridge alert management standards (references to IEC 62923-1 and IEC 62923-2).
- Performance parameters: Balance, friction error, calibration accuracy, damping, zero-point, output electrical signal characteristics and accuracy, response speed, power-supply fluctuation tolerance, insulation resistance and high-voltage safety.
- Testing: Defined methods of testing and required test results for construction, EMC/environmental safety, balance, friction, calibration, damping, signal output and alert performance.
- Interface, marking and information: Requirements for system interfaces, labelling and manufacturer documentation.
Applications and users
ISO 22554:2023 is essential for stakeholders involved in marine propulsion monitoring and safety:
- Shipbuilders and naval architects specifying onboard instrumentation
- Marine electronics and instrumentation manufacturers designing propeller shaft RPM indicators
- Classification societies and flag administrations assessing SOLAS compliance
- Ship operators, marine engineers and shipyards performing installations, retrofits or maintenance
- Bridge system integrators and automation vendors ensuring interface and alert compatibility
Typical applications include remote RPM indication at the bridge and engine control room, integration with navigational displays, alarm/alerting for abnormal shaft behavior, and monitoring in both newbuild and retrofit scenarios.
Related standards
Key related documents referenced in ISO 22554:2023:
- IMO Resolution A.694(17)
- SOLAS 1974 (Regulation 19, Chapter V)
- IEC 60945
- IEC 61162 series (digital interfaces)
- IEC 62288 (navigation display presentation)
- IEC 62923-1 / IEC 62923-2 (bridge alert management)
- IMO MSC.191(79), MSC.466(101), MSC.302(87)
Keywords: ISO 22554:2023, propeller shaft revolution indicators, propeller shaft RPM indicator, electric type, electronic type, marine technology, SOLAS compliance, signal converter, calibration accuracy.