2.3 Composition, Structural Integrity and Special Handling

Capacity starts with the load’s condition

Structural integrity means the object and its attachment structure can transmit the planned lifting forces without failure. A sling rating tells how much the sling can carry in its rated configuration. It does not tell whether the cabinet panel, pipe wall, lifting lug or weld beneath the sling can carry the same force. A strong rigging system attached to a weak part of the load remains unsafe.

Identify the load’s materials and construction. A thin sheet-metal housing differs from its internal steel frame. A concrete panel differs from the approved embedded lifting anchor. A cast component may have localized brittle features, and a fabricated skid may rely on a particular sequence of attachments. Use drawings and manufacturer handling instructions to identify intended load paths rather than selecting the most convenient projection.

Look for deterioration or damage that changes the original assumptions: corrosion, cracking, missing fasteners, repairs, weakened welds, bent frames or damaged lifting inserts. Do not decide that a lifting point is acceptable simply because its hole still admits a shackle. The connection’s surrounding structure and the direction of force matter as much as the hole itself.

Separate approved picks from ordinary features

An attachment point intended for lifting has a defined relationship to the load and its rated handling condition. A handrail, process nozzle, mounting bracket or transport tie-down point may have no lifting rating. Even a genuine lifting point may be intended only for a component before assembly, not for the weight of the completed machine.

Ask what load and direction the attachment was designed to carry. A lug intended for an in-plane pull may be unsuitable for an out-of-plane sling. A tapped lifting hole needs appropriate thread engagement and surrounding material strength. A trunnion may require a particular sling position or restraint to prevent disengagement. Where the evidence is incomplete, obtain approval from the manufacturer or responsible qualified person before proceeding.

Special handling is part of scope

Special handling requirements include keeping an item upright, limiting acceleration, protecting a finish, controlling liquid movement or preserving sensitive internal parts. These are design inputs. They should not be discovered after the load is already suspended.

A battery cabinet may have restrictions on tilt or require securing internal modules. A precision machine may have designated support points to prevent distortion. A thin-walled vessel may require a spreader with vertical lower slings so the shell is not squeezed by an inclined bridle. A fragile surface may need compatible contact materials while still meeting the sling’s bend and cut-protection requirements.

Do not assume a soft sling automatically protects every finish or prevents structural damage. Grit trapped beneath webbing can mark the surface. A wide sling can still crush a weak panel. Padding used for cosmetic protection may provide no rated resistance to cutting. Address surface protection, load strength and sling protection as separate needs.

Secure moving and loose parts

Doors, covers, counterweights, internal carriages and retained components can move when orientation changes. A movable mass shifts the center of gravity, changing load share and stability. Loose parts can become falling objects even when the principal load remains attached. Confirm which parts must be removed or restrained and how their restraint affects the total weight.

Consider a machine with a heavy slide positioned near one end. Calculating center of gravity with the slide centered does not describe the actual pick. If the slide travels during lifting, the calculation can change mid-operation. Locking it in the manufacturer’s approved transport position creates a controlled configuration; tying an improvised rope around it may not provide equivalent restraint.

Containers deserve similar attention. A crate may support cargo from below during shipping but have no capacity for lifting from its upper boards. A pallet can fail if straps create concentrated forces at unsupported deck edges. Identify whether the rigging carries the object directly, an approved handling container or an unverified package.

Inspection and escalation scenario

The crew finds a cracked weld beside a skid’s intended lifting lug. The crane and slings exceed the calculated demand, but the visible crack interrupts the load path into the skid. The rigger should stop the planned attachment, communicate the finding and obtain an approved repair or alternative method. Moving the sling to an adjacent unmarked rail does not resolve the defect.

Before authorizing motion, connect special handling information to the plan: maximum permitted tilt if specified, designated support locations, retained contents, restrained parts and protection materials. Explain these limits in the team briefing so the operator knows which motion would create a problem. If the owner’s instruction conflicts with the proposed geometry, redesign the rigging rather than treating the instruction as an optional preference.

Sources: CCO Level II scope, CCO reference manual.