Safe working load (SWL) of emergency towing arrangement fittings per IACS UR A2 - bollard and chock sized to at least 1.25 × expected towline break load.
Formula
$$ \text{SWL}_{fitting} \geq 1.25 \cdot BL_{line} $$Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $DWT$ | Deadweight | dwt | tonnage certificate |
| $BL$ | Towline breaking strength | kN | UR A2 Table |
| $SWL$ | Safe working load | kN | IACS UR A1/A2 |
Sources
- IACS UR A2.