IACS Unified Requirement M21 - Crankcase explosion relief valves. Covered by all member class societies.
Formula
$$ \text{IACS UR M21} \Rightarrow \text{Machinery} $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $M21$ | Crankcase explosion relief valves | - | IACS website |
Sources
- IACS UR M21.