ISO 20474-9:2017

Overview

ISO 20474-9:2017 - "Earth‑moving machinery - Safety - Part 9: Requirements for pipelayers" defines the machine-specific safety requirements for pipelayers (as per ISO 6165). It is a type‑C standard intended to be used together with ISO 20474-1 (general safety requirements for earth‑moving machinery). Where Part 9 contains more specific provisions, those take precedence. The standard covers significant hazards during commissioning, operation and maintenance and is not applicable to machines manufactured before its publication date.

Key topics and technical requirements

• Scope & definitions
  • Applies to side‑boom and rotating pipelayers; pipelayer defined per ISO 6165.
• Operator station & protection
  • If a cab is fitted, add a motorized washer and wipers in the working direction.
  • Rotating pipelayers must be fitted with a ROPS meeting ISO 12117‑2.
• Stability and lifting equipment
  • Lifting equipment must comply with ISO 8813.
  • Load lowering control: operators must be able to control and stop lowering; free‑fall release allowed for hook‑winch only.
  • Pipe‑laying brakes: automatically applied when controls released or power fails; designed to withstand 1.5 × rated lift capacity under manufacturer‑specified conditions.
  • Hooks: tested to 2× WLL without permanent deformation and breaking force 4× WLL (ISO 7597). Hooks used for other tasks require a safety latch.
  • Rope selection must follow ISO 16625.
• Rear‑mounted winches
  • If fitted, ISO 20474‑1 requirements apply except where the load‑hoist mechanism is specified by ISO 7136.
  • Winch marking: maximum rated bare drum pull per ISO 19472.
• Noise measurement
  • Sound power and operator‑station emission are measured to ISO 6393 and ISO 6394 respectively.
• Information for use
  • Safety labels and operator’s manual must include pipelayer‑specific symbols and instructions (e.g., team operation, boom/hoist procedures, winch use). Winch symbol per ISO 9244 / ISO 6405‑2 symbol no. 18.

Applications and who uses it

ISO 20474-9:2017 is used by:

• Manufacturers & OEMs designing and certifying pipelayers to meet international safety expectations
• Design engineers specifying lifting systems, hooks, ropes and braking controls
• Safety/compliance officers and third‑party assessors verifying machine conformity
• Fleet managers & maintenance teams implementing safe operating procedures and manuals
• Regulators and procurement specialists referencing machine safety requirements in tenders and legislation

Related standards

• ISO 20474-1 (General requirements)
• ISO 6165 (Machine types/terms)
• ISO 8813 (Lift capacity for pipelayers)
• ISO 12117‑2 (ROPS)
• ISO 7597 (Hooks), ISO 16625 (Wire ropes)
• ISO 6393 / ISO 6394 (Noise)
• ISO 9244, ISO 19472 (labels, winch marking)

Keywords: ISO 20474-9:2017, pipelayers safety standard, earth‑moving machinery, pipelayer requirements, side‑boom pipelayer, rotating pipelayer, lifting equipment, winch safety, ROPS, operator’s manual.