Capacity Check — Flat-Top Tower Crane
Gross-load vs chart utilization for a flat-top tower crane, with rigging weight and dynamic allowance included.
Flat-tops dominate congested skylines because jibs can overslew each other without clashing tops. Their charts step down hard with radius — the 2.3 t default at 50 m is a typical 10 t-class machine's tip load. The utilization check is the planner's first question: does the pick at the far corner actually fly?
Formula
Note: Rigging and crane decisions are life-safety critical. This calculator is a planning aid — the load chart, sling tags, site lift plan and a qualified lift director govern every real lift.
Gross-load vs chart utilization for a flat-top tower crane, with rigging weight and dynamic allowance included. A free crane load, wind & rigging safety tool — no sign-up, no upload, instant results in your browser.
About Capacity Check — Flat-Top Tower Crane
Capacity Check — Flat-Top Tower Crane computes the governing relationship gross = (net + rigging) × (1 + dynamic%) vs chart at radius live as you type. Flat-tops dominate congested skylines because jibs can overslew each other without clashing tops. Their charts step down hard with radius — the 2.3 t default at 50 m is a typical 10 t-class machine's tip load. The utilization check is the planner's first question: does the pick at the far corner actually fly? Defaults are pre-filled with realistic values for this exact scenario, and the worked example substitutes your numbers step by step so the math is never a black box.
How to use Capacity Check — Flat-Top Tower Crane
- 1Enter your values — Net load, Rigging + block weight, Chart capacity at this radius/config, Dynamic allowance (sensible defaults are pre-filled).
- 2Read the live results: Gross design load, Chart utilization, Remaining margin.
- 3Check the "with your numbers" line to see gross = (net + rigging) × (1 + dynamic%) vs chart at radius substituted step by step.
- 4Adjust inputs until the scenario matches yours, then copy or share the result.
Why use Capacity Check — Flat-Top Tower Crane?
- ✓Instant, free and private — every calculation runs client-side in your browser; nothing is uploaded
- ✓Built on the stated formula gross = (net + rigging) × (1 + dynamic%) vs chart at radius with authoritative sources cited on the page (ASME B30.5/B30.9/B30.20 — Cranes, slings and below-the-hook devices; OSHA 29 CFR 1926 Subpart CC — Cranes & derricks in construction)
- ✓Flat-tops dominate congested skylines because jibs can overslew each other without clashing tops.
- ✓SI ⇄ Imperial toggle converts your inputs in place, so you can work in the units your drawings use
Frequently asked questions
What formula does the capacity check — flat-top tower crane use?+
It evaluates gross = (net + rigging) × (1 + dynamic%) vs chart at radius, exactly as published. Sources: ASME B30.5/B30.9/B30.20 — Cranes, slings and below-the-hook devices; OSHA 29 CFR 1926 Subpart CC — Cranes & derricks in construction. The substituted worked example on the page lets you verify every step against the textbook.
How should I read the result — and how far can I trust it?+
Flat-tops dominate congested skylines because jibs can overslew each other without clashing tops. Rigging and crane decisions are life-safety critical. This calculator is a planning aid — the load chart, sling tags, site lift plan and a qualified lift director govern every real lift.
When is this calculator the right tool for the job?+
Gross-load vs chart utilization for a flat-top tower crane, with rigging weight and dynamic allowance included. A free crane load, wind & rigging safety tool. Their charts step down hard with radius — the 2.3 t default at 50 m is a typical 10 t-class machine's tip load. For neighbouring scenarios, the related tools below cover the same engine with different presets.
Does it support both metric and imperial units?+
Yes — the SI ⇄ Imperial toggle converts the values already in the fields, preserving the physical quantity, so you can flip mid-calculation without re-entering anything.
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