Fire Main Diameter (SOLAS II-2)
Minimum fire main internal diameter per SOLAS II-2 Reg 10: d = 25 + 1.68·√(L·(B+D)).
Fire main ID (minimum)
193mm
Formula, assumptions, and limits
Cast from SOLAS II-2 Reg 10-2. Branch diameters follow the same shape but with a smaller coefficient: d = 25 + 2.16·√(c·(B+D)) where c is the branch length. Use commercial pipe sizes (DN) one step up from the calculated value.
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| Rule length (≈ LBP) | m | class certificate | |
| Beam | m | class certificate | |
| Moulded depth | m | class certificate | |
| Fire-main internal diameter | mm | result |