Ballast Stability Concept — Cross-Base Ballast Check
Freestanding tower stability ratio: ballast moment vs load + jib overturning moment (concept check).
A freestanding tower stands because base ballast moment beats overturning moment with the code margin (≈1.5 in service). The check here is the concept in one line — real stability calcs add wind on tower and jib, out-of-service cases and dynamic terms, all from the maker's tables, never improvised.
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.
Freestanding tower stability ratio: ballast moment vs load + jib overturning moment (concept check). A free crane load, wind & rigging safety tool — no sign-up, no upload, instant results in your browser.
About Ballast Stability Concept — Cross-Base Ballast Check
Ballast Stability Concept — Cross-Base Ballast Check computes the governing relationship ratio = M_ballast / (W·r + M_jib) — service case needs ≥ ~1.5 live as you type. A freestanding tower stands because base ballast moment beats overturning moment with the code margin (≈1.5 in service). The check here is the concept in one line — real stability calcs add wind on tower and jib, out-of-service cases and dynamic terms, all from the maker's tables, never improvised. 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 Ballast Stability Concept — Cross-Base Ballast Check
- 1Enter your values — Base ballast mass, Ballast lever arm, Gross load, Load radius and more (sensible defaults are pre-filled).
- 2Read the live results: Stabilizing moment, Overturning moment, Stability ratio.
- 3Check the "with your numbers" line to see ratio = M_ballast / (W·r + M_jib) — service case needs ≥ ~1.5 substituted step by step.
- 4Adjust inputs until the scenario matches yours, then copy or share the result.
Why use Ballast Stability Concept — Cross-Base Ballast Check?
- ✓Instant, free and private — every calculation runs client-side in your browser; nothing is uploaded
- ✓Built on the stated formula ratio = M_ballast / (W·r + M_jib) — service case needs ≥ ~1.5 with authoritative sources cited on the page (EN 13001 / EN 14439 — Crane design & tower crane standards; ASME B30.5/B30.9/B30.20 — Cranes, slings and below-the-hook devices)
- ✓A freestanding tower stands because base ballast moment beats overturning moment with the code margin (≈1.5 in service).
- ✓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 ballast stability concept — cross-base ballast check use?+
It evaluates ratio = M_ballast / (W·r + M_jib) — service case needs ≥ ~1.5, exactly as published. Sources: EN 13001 / EN 14439 — Crane design & tower crane standards; ASME B30.5/B30.9/B30.20 — Cranes, slings and below-the-hook devices. 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?+
A freestanding tower stands because base ballast moment beats overturning moment with the code margin (≈1.5 in service). 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?+
Freestanding tower stability ratio: ballast moment vs load + jib overturning moment (concept check). A free crane load, wind & rigging safety tool. The check here is the concept in one line — real stability calcs add wind on tower and jib, out-of-service cases and dynamic terms, all from the maker's tables, never improvised. 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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