Cofferdam glycol-heater duty required to keep inner-hull steel above the brittle-fracture limit (+5 °C) given cargo-tank temperature and ambient seawater.
Formula
$$ \dot Q = U \cdot A \cdot (T_{cofferdam} - T_{tank}) $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $U$ | Bulkhead overall heat-transfer coefficient | W/m²·K | insulation data sheet |
| $A$ | Heat-transfer area | m² | GA drawings |
| $\Delta T$ | Temperature difference | K | tank/cofferdam gauges |
Sources
- IGC Code 2016 - Ch. 4.
- GTT NO96 / Mark-III technical bulletins.