Overview
ISO 8813:1992 - "Earth‑moving machinery - Lift capacity of pipelayers and wheeled tractors or loaders equipped with side boom" defines a uniform method to calculate and validate the rated lift capacity of pipelayers and wheeled tractors/loaders fitted with a side boom. The standard applies to machines with a lift capacity greater than 10 000 N, provides essential terms and definitions (load, tipping line, balance point, rope factor, etc.), and prescribes a test method to verify published lift capacity data.
Key topics and technical requirements
- Scope and definitions: Covers pipelayers, wheeled tractors and loaders with vertical‑only pivoted hydraulic or mechanical side booms; references ISO vocabulary and measurement practices.
- Calculation method: Procedures to compute tipping load, lift mechanism lift capacity (mechanical draw works, hydraulic, rope‑factor limited), and application of a reduction factor to establish the marketed rated lift capacity.
- Tipping lines & balance points: Distinguishes tipping lines for crawler, wheeled (oscillating and non‑oscillating axles) and outrigger configurations; defines calculated and measured balance points.
- Rope factor: Minimum rope factor of 4 for drums/sheaves (special provisions allow down to 2.5 with documented controls and inspections).
- Performance requirements: Hoist mechanisms must include positive locks and automatic stops at maximum boom height; brakes/automatic devices to prevent load drop on power loss.
- Testing & validation:
- Static tests on a firm, level surface; dead weight and live weight test methods.
- Instrumentation accuracy per ISO 9248; force transducers, load‑overhang measurement and hydraulic pressure monitoring required.
- Measured lift loads should be within 95% of calculated values; adjustment via correction factor if not.
- Rated lift capacity declaration: The rated value must be the smallest of a set of limits (including percentages of tipping load: pipelayers 85%, wheeled machines 65%, machines with outriggers 85%) and the lift mechanism and rope limits.
Practical applications
- Develop accurate lift capacity charts and commercial literature for pipelayers and side‑boom machines.
- Verify machine configurations (outriggers, counterweights, attachments) for safe lifting operations.
- Support type‑approval, factory testing and performance validation by test laboratories.
- Inform operator manuals, specification sheets and procurement decisions where lift performance and safety are critical.
- Equipment manufacturers and design engineers
- Test laboratories and certification bodies
- Fleet owners, safety engineers and equipment purchasers
- Technical authors preparing operator manuals and lift capacity charts
Related standards
Relevant cross‑references include ISO 6165, ISO 7136, ISO 7131, ISO 6747, ISO 6016, and ISO 9248, which cover terminology, machine types, mass measurement and test instrumentation accuracy.
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