ISO 10494-2018 PDF

Full title and description

ISO 10494:2018 — Turbines and turbine sets — Measurement of emitted airborne noise — Engineering/survey method. This International Standard specifies engineering (field/survey) methods for measuring airborne noise emitted by turbines and turbine sets under steady-state operating conditions, and for calculating A‑weighted sound power levels and octave or one‑third‑octave band sound power levels from measured sound pressure on an enveloping measurement surface.

Abstract

Specifies procedures, test-environment requirements and instrumentation for measuring sound pressure levels on a measurement surface that envelops the turbine (or turbine set) and for calculating the emitted sound power. Applicable to turbines and turbine sets used in power plants, industrial installations, ships, offshore installations, and road or railway vehicles; excludes gas turbines in aircraft applications. The standard applies to the portion of the turbine set located above the floor and inside a continuous enveloping measurement surface, and is intended for steady‑state operation (transient events such as start‑up and shut‑down are excluded).

General information

• Status: Published.
• Publication date: 19 April 2018 (2nd edition, 2018).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 27.040 (Gas and steam turbines); 17.140.20 (Noise emitted by machines and equipment).
• Edition / version: Edition 2 (2018).
• Number of pages: 37.

Scope

ISO 10494:2018 applies to measurement of airborne noise emitted by turbines and turbine sets under steady operating conditions. It gives methods for taking sound pressure measurements on an enveloping measurement surface and for deriving the A‑weighted sound power level and octave / one‑third‑octave band sound power levels. The document is applicable to stationary power‑plant and industrial turbines and to turbine installations on ships, offshore platforms and some vehicle installations, but it does not apply to gas turbines used in aircraft. The standard is intended for the part of the turbine set located above the floor within a continuous measurement surface and excludes transient conditions such as start‑up and shut‑down where short‑term emissions may differ from steady‑state values.

Key topics and requirements

• Definition and use of an enveloping measurement surface for field (engineering/survey) noise measurement.
• Procedures for measurement of sound pressure levels on that surface and conversion to sound power levels (A‑weighted and octave / one‑third‑octave bands).
• Requirements for test environment, background noise assessment and mitigation, and handling of reflections from floors and nearby surfaces.
• Instrumentation and calibration requirements (sound level meters, microphones, data acquisition and analysis methods).
• Selection of measurement locations, averaging and statistical treatment appropriate to steady‑state operation.
• Limitations and exclusions — applicable to steady‑state operation only; transients (start/stop) and aircraft gas‑turbine applications are excluded.

Typical use and users

Used by acoustic consultants, test laboratories, turbine manufacturers, plant operators, shipbuilders and offshore engineering teams for acceptance testing, performance verification and environmental/noise compliance assessments of turbine installations. Also referenced by regulatory bodies and environmental noise assessors when evaluating turbine noise impact in industrial and marine contexts.

Related standards

ISO 10494 is part of the family of acoustics and machinery noise measurement standards. Commonly referenced related documents include ISO 3744 / ISO 3745 (determination of sound power levels using sound pressure — engineering and precision methods), ISO 11200 (guidance for using basic standards for emission sound pressure levels at workstations), ISO 8297 (multi‑source industrial plants), ISO 9614 (sound intensity methods) and various machine‑specific test codes (for rotating machines, fans, electrical machines, etc.). These standards are often used together to define test method, environment and reporting for machine noise measurement programmes.

Keywords

ISO 10494, turbines, turbine sets, airborne noise, sound pressure level, sound power level, measurement surface, engineering method, field survey, acoustics, steady‑state measurement.

FAQ

Q: What is this standard?

A: An International Standard that specifies engineering/survey methods for measuring airborne noise emitted by turbines and turbine sets and for calculating sound power levels (A‑weighted and band‑levels) from field measurements.

Q: What does it cover?

A: Measurement procedures, test environment and instrumentation requirements, selection of measurement locations on an enveloping measurement surface, and methods to calculate emitted sound power for steady‑state turbine operation. It excludes transient conditions (e.g., start‑up/shut‑down) and aircraft gas turbines.

Q: Who typically uses it?

A: Acoustic engineers, test laboratories, turbine and power‑plant manufacturers, ship and offshore installation engineers, environmental noise assessors and regulatory agencies.

Q: Is it current or superseded?

A: ISO 10494:2018 is the current (2nd) edition published in April 2018 and replaces the earlier 1993 edition; the document status is Published/confirmed under ISO’s review cycle.

Q: Is it part of a series?

A: It is not a multi‑part series titled as ISO 10494/x, but it belongs to the wider family of acoustics and machinery noise measurement standards (e.g., ISO 3744, ISO 3745, ISO 11200, ISO 8297, ISO 9614) that are commonly used together for machine noise assessment and reporting.

Q: What are the key keywords?

A: turbines, turbine sets, airborne noise, sound pressure, sound power, measurement surface, engineering/survey method, field measurement, acoustics.