ISO 9245:1991

Overview

ISO 9245:1991 - "Earth-moving machinery - Machine productivity - Vocabulary, symbols and units" provides a concise, bilingual (English/French) vocabulary for reporting and discussing the productivity of earth‑moving machines. The standard defines core terms, symbols and units commonly used when determining or presenting machine productivity. It does not prescribe measurement procedures or reporting formats; Annex A is informative and the document refers to ISO 6165 for basic equipment type definitions.

Key topics

• Defined terms and symbols: includes productivity (Q), basic/theoretical productivity (Qe), actual productivity (QA), job efficiency factor (fE), swell factor (fS), fill factor (fF), plus related items such as rated volume (VR), cycle and cycle time (t).
• Units: productivity is expressed in cubic metres per hour (m3/h); cycle time in minutes; rated volumes in cubic metres.
• Contextual data required when reporting productivity: ISO 9245 emphasizes that productivity figures should be accompanied by relevant details that affect results:
  • equipment and attachments fitted
  • material type and soil characteristics (particle-size distribution, density, moisture)
  • material condition (bank/loose)
  • type and conditions of operation (excavation depth, scraping depth, haul-road condition)
  • type of receiving equipment (hauler, hopper, stockpile)
  • weather and date/time/location
• Clarification of terms: distinguishes short‑period attainable (basic/theoretical) productivity from continuously attainable (actual) productivity and defines the job efficiency factor as QA/Qe.

Applications

ISO 9245 is practical for anyone who needs consistent terminology and units when specifying, comparing or documenting earth‑moving machine productivity:

• Equipment manufacturers - to label specifications and communicate rated volumes and productivity metrics.
• Contractors and fleet managers - to compare machine performance and build realistic production plans.
• Estimators and project planners - to ensure productivity inputs are comparable when preparing bids or schedules.
• Technical authors and specifiers - to write clear tenders, user manuals and performance clauses using standardized terms.
• Test labs and standards committees - as a reference vocabulary when developing or interpreting productivity tests.

Using ISO 9245 helps avoid ambiguity in productivity reporting and supports meaningful comparison of machines and operating scenarios.

Related standards

• ISO 6165 - Earth‑moving machinery: basic types - vocabulary (referenced)
• Volumetric rating standards (informative bibliography/Annex A): ISO 6483, ISO 6484, ISO 6485, ISO 7451, ISO 7546, ISO 9246

Keywords: ISO 9245, earth‑moving machinery, machine productivity, vocabulary, symbols, units, productivity definitions, swell factor, fill factor, cycle time, rated volume.