Lifting & Tailing Lug Calculator
Pressure Vessel Rigging · Engineering Tool · Migatech
Inputs
01
Design Basis
Design Factor, NdBTH-1 §3-1.3
—
Vessel
Lift Weightkg · W
kg
ODmm
mm
Lengthmm · L
mm
Top Lug → CoGmm
mm
Lifting Lugs
Quantityn
Sling Angle θdeg
°
Side Coef.—
—
Tailing Lug
Angle βdeg
°
Quantityn
Lift Method—
Lug Geometry
Material—
FyMPa
MPa
FuMPa
MPa
Thickness, tmm
mm
Width, Wmm
mm
Hole CL, Hmm
mm
Crown Rmm
mm
Hole Dhmm
mm
Pin Dpmm
mm
Edge Distance, amm
mm
Weld Leg, twmm
mm
Material—
FyMPa
MPa
FuMPa
MPa
Thickness, tmm
mm
Width, Wmm
mm
Hole CL, Hmm
mm
Crown Rmm
mm
Hole Dhmm
mm
Pin Dpmm
mm
Edge Distance, amm
mm
Weld Leg, twmm
mm
Weld Properties
Filler Classfuw
Category, φAS 1554.1
Schematic
RIGGING ARRANGEMENT
Elevation
Schematic · NTS
UPEND START
W = — t
Section A-A
OD = —
— LUGS
θ = —°
Lug Detail · Lifting
Pin-loaded plate
Shell
Lifting Lug
Tailing Lug
Sling Force
Results
η · MPa
Lifting Lug
PASS
0.0% util
All checks within allowables
Sling F
—kN
Vert. P
—kN
Side P
—kN
Tailing Lug
PASS
0.0% util
All checks within allowables
Sling F
—kN
Vert. P
—kN
Horiz P
—kN
Check Summary
Detailed Calculations
Design Loads & Force ResolutionAS 4991
Lifting Lug — Stress Limit StatesBTH-1 §3-3
Tailing Lug — Stress Limit StatesBTH-1 §3-3
Weld Group — Combined ActionAS 1554.1
Methodology & References
Design load — total load at each lug = vessel weight × g ×
N_d. Single combined factor lumps dynamic, impact, and skew effects. Default N_d = 2.0 per ASME BTH-1 Class A; 3.0 for Class B.Pin bearing —
σ = P / (D_p · t) ≤ 1.25·F_y / N_d per BTH-1 §3-3.3.1.4.Net-section tension —
σ = P / [(W − D_h)·t] ≤ 0.45·F_y per BTH-1 §3-3.3.1.1.Shear tear-out —
τ = P / (2·a·t) ≤ 0.40·F_y per BTH-1 §3-3.3.1.2.Double-plane shear —
τ = P / [2t·√(R² − (D_p/2)²)] ≤ 0.40·F_y per BTH-1 §3-3.3.1.3.Combined axial + bending at base —
σ = P_v/(W·t) + 6·P_h·H/(t·W²) ≤ 0.66·F_y per AISC F1 / AS 4100 §8.Weld combined action — closed rectangular line group
L = 2(W+t); resultant σ_res = √[(τ_v + σ_b)² + τ_h²] ≤ φ·0.6·f_uw per AS 1554.1 §6.7.4.Calculator implements widely-used limit-state checks for plate-type lifting and tailing lugs; an aid to qualified engineers. Does not assess local shell stress (refer WRC 107/297 or FEA), pad-to-shell weld design, lift-point clearance, or rigging hardware capacity. Final design and certification remain the responsibility of the responsible engineer per applicable Australian, ASME and project-specific codes.