Quick-reference cards
The numbers that must be instant. Print these (Ctrl/Cmd-P — print styles included) and laminate them for the workbox.
1 · Sling angles
- 90° = 1.0 · 60° = 1.155 · 50° = 1.305 · 45° = 1.414 · 30° = 2.0
- Minimum angle 30° from horizontal
- Load/leg = vertical share × factor
- Field: TF = L ÷ H (tape measure)
Crosby
2 · Hitches
- Vertical 1.0 · Basket 2.0 (D/d ≥ 25) · Choker ×0.75–0.8
- Chain choker: −20%
- Choke angle ≥ 120° or reduce further
- Eye over fitting ≤ ⅓ eye length
Crosby
3 · Shackles
- In-line 100% · 90° side load 50%
- Round-pin: never side-load
- Two legs ≤ 120° included — in the bow, never on the pin
- Bolt-type + cotter for permanent installs
Crosby catalog p.94
4 · D/d ratio
- 25:1 → 100% (wire-rope basket basis)
- ~3:1 → ~65% · 1:1 → ~50%
- Roundslings/web: manufacturer minimum hardware Ø
Crosby / WRTB
5 · Safety factors
- Chain/shackle 4:1 · wire rope 5:1 · fibre/webbing 6:1
- 8:1 any load over people
- 10:1 suspension of persons
- WLL = MBL ÷ SF — document the SF on every point sheet
LPA HG03
6 · Truss
- Only a single span on 2 supports reads off the table
- ×0.85 wear factor (ANSI E1.2 / BS 7905-2)
- Deflection governs long spans
- Loads into nodes · 3+ supports / cantilever / arc = engineer
Prolyte / ANSI E1.2
7 · Hoists
- D8: + rated bond to hold over people · never move over people
- D8+: 10:1, double brake — static hold over people
- C1: 10:1, dual brake + limits + monitoring — may move over people
- Discard chain < 90% nominal wire Ø
SQ P2 / DIN 56950 / E1.6
8 · Crane
- Net = gross − (hook + slings + spreaders)
- Radius grows under load — no interpolation between rows
- Counterweight / outriggers / jib must match the chart
- HOIST 1 long · LOWER 2 short · STOP 1 short · e-stop from anyone
Qld CoP / AS 2550.1 / CICA
9 · Fall protection
- Free fall ≤ 2 m · body force ≤ 6 kN · anchors ≥ 15 kN
- Clearance = fall + absorber + stretch + 1 m residual
- Low grid → SRL, not lanyard
- Rescue plan BEFORE work — suspension trauma in minutes
AS/NZS 1891
10 · Wind & outdoor
- Design ≥ 0.75 × ASCE 7 basic · floor 40 mph (≈64 km/h) gust
- Force ∝ speed² × sail area
- OMP with trigger thresholds · designated weather watcher
- Ballast/guys = engineering, not rules of thumb
ANSI E1.21