Hatch Cover Design Pressure (IACS UR S21A)
Design pressure head on weather-deck hatch covers by position along the hull.
Design pressure
25.5kN/m²
Equivalent water head
2.60m
Formula, assumptions, and limits
IACS UR S21A base head values (Position 1 forward of 0.25 L, Position 2 elsewhere) converted to kN/m² via × g = 9.81. Additional dynamic wave pressure from the UR is added on the build; this page shows the baseline.
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| Hatch location along hull | - | IACS UR S21A | |
| Design head pressure | kN/m² | result |