🏗️ ASME B30.20 / BTH-1 Below-the-Hook Beams, Pure Compression vs Bending Moments

Spreader Bar vs Lifting Beam Rigging Calculator

Compare engineered below-the-hook lifting devices under ASME BTH-1 (Design Category B, Service Class 2): calculate pure axial compression loads in 2-point spreader bars (allowing lighter pipe sections) versus high bending moments (M = PL/4 in center-hook lifting beams with low headroom), pad eye tear-out stresses, and spreader rental margins.

1. Project & Operating Inputs

Total Lifted Heavy Load (Tons e.g. 45 Ton Vessel)

Beam Span Length (Feet e.g. 24 ft Clear Span)

Customer Monthly Invoiced Spreader Rental ($ / Month)

Certified Spreader Bar Maintenance, Recertification & Logistics ($ / Month)

2. Financial Breakdown & Yield

ASME BTH-1 SPREADER BAR SIZING

Monthly Spreader Rental Net Profit

Below-the-Hook Rental Margin

0.0%

Gross Revenue / Bill

Total Project CapEx

Operating / Material Cost