ISO 20083-2-2019 PDF

Full title and description

Ships and marine technology — Determination of the shaft power of ship propulsion systems by measuring the shaft distortion — Part 2: Optical reflection method. This International Standard specifies an on‑board procedure using an optical reflection type device to measure torsional distortion of a propeller/propulsion shaft and calculate shaft torque and shaft power.

Abstract

ISO 20083-2:2019 defines the measurement principles, required components (split mounting rings, torsion meter/reflecting mirror, transmitter/receiver, revolution sensor and associated electronics), calculation method to convert measured shaft distortion into torque and power, calibration and zero‑adjustment procedures, factors affecting measuring accuracy, and required on‑board documentation for the device.

General information

• Status: Published (International Standard; reviewed/confirmed in ISO review cycle).
• Publication date: June 2019 (edition 1, published 2019-06).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 47.020.20 — Marine engines and propulsion systems.
• Edition / version: Edition 1 (2019).
• Number of pages: 10 pages (English edition).

(Information above based on the ISO catalogue entry and standard bibliographic metadata.)

Scope

Specifies a procedure to determine shaft power of engine‑driven ships by measuring torsional distortion of the propeller shaft using an optical reflection method. The document covers measurement principles, device components and mounting, calculation of shaft torque and power from measured distortion and rpm, accuracy factors (shaft geometry, G‑modulus, ring spacing, vibration, zero adjustment), calibration procedure and the on‑board documentation that must accompany the device. It is intended for in‑service on‑board measurements rather than factory calibration alone.

Key topics and requirements

• Measurement principle: non‑contact optical reflection measurement of shaft distortion combined with rpm to compute torque and power.
• Required components: split/mounting rings, torsion meter / reflecting mirror assembly, transmitter and receiver, revolution sensor, data processing and power supply units.
• Calculation methods: formulae to convert measured torsional deformation to shaft torque and to compute shaft power from torque and rotational speed.
• Accuracy factors and limits: shaft diameter, material G‑modulus, distance between mounting rings, ring thickness, shaft vibration, and procedures for zero adjustment.
• Calibration and verification: prescribed calibration procedure, sample calibration result form (informative annex), and periodic re‑calibration guidance.
• On‑board documentation: installation, calibration certificate, zero‑adjustment instructions and user/maintenance information to be carried with the device.

These topics and technical requirements reflect the standard text and its annexed sample calibration form.

Typical use and users

Used for on‑board verification and monitoring of propeller shaft power on commercial ships, research vessels and other engine‑driven vessels. Typical users include ship operators, marine surveyors and classification societies, marine engineers, test houses and manufacturers/suppliers of shaft power meters and shaft instrumentation.

Related standards

ISO 20083-2 is part of the ISO 20083 series addressing shaft power measurement methods; the closely related Part 3 (ISO 20083-3:2019) covers the elastic vibration method. The work falls under ISO/TC 8/SC 2 (marine machinery and propulsion systems). Users should consider other ISO marine measurement and instrumentation standards referenced by ISO/TC 8 where applicable.

Keywords

shaft power, shaft torque, shaft distortion, torsional measurement, optical reflection method, marine propulsion, calibration, ISO 20083-2, ISO/TC 8/SC 2, on‑board instrumentation.

FAQ

Q: What is this standard?

A: ISO 20083-2:2019 is an International Standard that specifies an optical reflection method to measure torsional distortion of a ship’s propulsion shaft and calculate shaft torque and shaft power.

Q: What does it cover?

A: It covers the measurement principle, the device components and mounting, the calculation methods to derive torque and power from measured distortion and rpm, factors affecting measurement accuracy, calibration/zero‑adjustment procedures and required on‑board documentation.

Q: Who typically uses it?

A: Ship operators, marine engineers, surveyors and classification societies, test laboratories and vendors of shaft power meters use this standard for on‑board shaft power measurement and verification.

Q: Is it current or superseded?

A: ISO 20083-2:2019 was published in June 2019 (first edition). The ISO record shows the standard is published and was subject to the five‑year review cycle (the ISO catalogue indicates confirmation/review status). Users should check their national standards body or the ISO catalogue for the most current confirmation/revision status before use.

Q: Is it part of a series?

A: Yes — it forms part of the ISO 20083 series on shaft power determination; Part 3 (ISO 20083-3:2019) provides an alternative elastic vibration method and is directly related.

Q: What are the key keywords?

A: Key keywords include shaft power, shaft torque, shaft distortion/torsion, optical reflection method, calibration, marine propulsion and ISO 20083.