IACS UR S27 - Bow Door / Inner Door Check
Bow / visor / side door design pressure per IACS UR S27 - critical for ro-ro passenger ships after Estonia (1994).
Design pressure
746.7kN/m²
Formula, assumptions, and limits
$$p = 2.75 (L + 15) (1 + 0.04 z)^2$$
Typical 50–100 kN/m². Inner door independent of bow door - must withstand full impact pressure if bow door fails. Interlock and monitoring alarms mandatory.
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $L$ | Rule length | m | IACS UR S2 |
| $z$ | Height above LWL | m | GA drawing |
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