Lifting & Rigging

Overview

Plan it: know the weight and CoG, match the crane chart, use rated gear, keep people clear.

Step-by-step procedure

Determine load weight, dimensions and centre of gravity.
Prepare a lift plan (crane, radius, capacity, ground, rigging).
Confirm crane, operator and gear certifications.
Set up on firm, level ground; outriggers on pads.
Rig with correct sling angles; attach tag lines.
Barricade the exclusion zone.
Trial-lift clear of ground, then complete on signals.

Key controls

Keep sling included angles ≥ 60° where possible.
Never exceed the crane chart at the working radius.
Stop lifting in high wind.

Roles & responsibilities

Role	Responsibility
Lift supervisor	Owns the lift plan and controls the operation.
Crane operator	Operates within the chart; stops if unsafe.
Rigger / banksman	Rigs the load; gives the signals.

Common mistakes to avoid

Guessing the load weight.
Multiple people signalling at once.
Outriggers on soft ground without pads.

Legal requirements (Thailand)

Occupational Safety, Health and Environment Act B.E. 2554 (2011) — the governing workplace-safety law in Thailand.
Ministerial Regulation on OSH for machinery, cranes and boilers B.E. 2564 (2021).

Frequently asked questions

What is Lifting & Rigging?

A lift goes wrong when the load is heavier than assumed, the gear is over-rated, the ground gives way, or people stand under the load. The remedy is planning: know the exact weight and centre of gravity, match it to the crane chart at the working radius, use certified gear within its rated capacity, and keep everyone out of the path.

Who is responsible?

Lift supervisor / appointed person: Owns the lift plan and controls the operation.; Crane operator: Operates within the chart and stops if unsafe.; Rigger / banksman: Rigs the load and gives the only signals to the operator.

What are the most common mistakes to avoid?

Guessing the load weight instead of confirming it. Multiple people signalling the operator at once. Outriggers on soft ground without adequate pads.

References — Company lifting procedure; crane inspection rules; Thai OSH Act B.E. 2554.