Pad Eye & Sling Geometry Checker
DNV 2.7-1 · Sling angle & headroom analysis
Container & pad eye geometry
m
m
m
Vertical distance from pad eye pin to crane hook
m
If provided, checks whether sling is long enough
m
Positive = toward bow / forward end
m
Positive = right on diagram (label as port/starboard per your orientation)
DNV 2.7-1 limit
°
DNV guidance limit: 60°. Above 60° requires specific engineering justification.
L = H ÷ cos(θmax)
Given a horizontal offset D and a headroom H, what is the minimum sling length needed to keep the angle below a limit?
m
Horizontal distance from pad eye to point directly below hook
m
°
Dmax = H × tan(θmax)
Given a headroom H, what is the maximum horizontal offset allowed before the sling angle exceeds the limit?
m
°
m
If set, checks the angle the sling would produce at this length instead
Top-down diagram
Side-view diagram
Results
Max sling angle (θ)
—°
Utilisation of θ limit
—
Min sling length
—m
Sling factor (1 ÷ cosθ)
—
Minimum sling length
—m
Actual angle at this offset
—°
Sling factor
—
L_min at θ_max (reference)
—m
Max horizontal offset
—m
Equiv. 4-pt pad eye spacing
—m
θ at D_max (= θ_max)
—°
H × 1.732 (θ = 60° rule)
—m
Calculation basis — DNV 2.7-1
About this tool
Calculates sling geometry for screening only. For a 4-point lift, the controlling angle is from the furthest pad eye to the hook centre. For asymmetric CoG positions, individual sling loads differ — use the Pad Eye & Sling Load Calculator for load-per-leg analysis. For certification, a full lifting analysis including dynamic amplification factors, rigging hardware, and spreader beam design is required.
DNV 2.7-1 angle limits are guidance values — specific engineering justification is required for angles above 60°.
Need a full DNV 2.7-1 lifting analysis? Request a proposal — Ingeniat
Results are indicative — not for use in certification submissions
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