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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 safetySOLAS
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Formula, assumptions, and limits

d=25+1.68L(B+D)d = 25 + 1.68 \cdot \sqrt{L \cdot (B + D)}
SymbolMeaningUnit
LLRule length (≈ LBP)m
BBBeamm
DDMoulded depthm
ddFire-main internal diametermm

Source: SOLAS II-2 Reg 10

In short

Minimum fire main internal diameter per SOLAS II-2 Reg 10: d = 25 + 1.

Learn the theory FSS Code: International Code for Fire Safety Systems