Tank cooling, foam application, and supplementary hose stream demand for a major tank fire scenario
◉ OISD-116 / API RP 2021 STYLE CHECK · NOT A REGULATORY SUBMISSION TOOL
⚠ Indicative tool only. OISD-116 figures (3 lpm/m² tank cooling, 12 lpm/m² rim-seal foam, 372 m³/hr supplementary stream) are sourced directly from the 2nd Revised Edition (June 2025) text, including its fully worked example (79m/14.4m tank → 1798 m³/hr total) which this tool's formulas were checked against. API RP 2021 figures (Tables 3 & 4: seal-fire and full-surface foam rates) are sourced directly from the 4th Edition (May 2001) text. NFPA 15 was checked but the available extract didn't contain a usable design-density table, so no NFPA 15 path is offered here. Both standards may have newer editions - confirm against the current published version before relying on this for a real assessment. This tool does not model the "two simultaneous major fires" design basis both standards reference - run it once per fire scenario and combine totals yourself, or use the simplified ×2 toggle at the bottom.
Identification
Research entries stay private to you for practice/testing. Switch to Official once this is a real assessment your company should see.
Tank-on-Fire & Cooling Water (OISD-116 §5.8.2)
Cooling water rate is 3 lpm/m² of shell area, applied to the tank on fire AND to every other tank within the same dyke (exposure protection) at the same rate — not reduced for the other tanks. Add each exposed tank as its own row.
Tank ID
Role
Diameter m
Height m
Shell Area m²
Cooling Water m³/hr
Cooling Water Result
Tank-on-fire cooling water—
Other exposed tanks cooling water—
Total cooling water—
Foam Application Water Demand
Choose the regulatory basis and scenario. Rim-seal / seal-fire scenarios use the annular area between the tank shell and the foam dam; full-surface scenarios use the entire tank cross-section.
12 lpm/m² is OISD-116's standard fixed/semi-fixed rim-seal system rate (from the worked example). An auto-actuation pre-mix system uses 18 lpm/m² instead — edit the rate field if that applies.
Rates/durations from API RP 2021 Tables 3 & 4 (NFPA 11 minimums) auto-fill on scenario change and are editable. Seal-fire scenarios use the rim-seal area below; full-surface scenarios use the tank's full cross-section.
Foam Water Result
Foam solution flow—
Water portion (after concentrate)—
Supplementary Hose Stream
OISD-116: fixed allowance of 4 hydrant outlets (36 m³/hr each) + 1 HVLRM (228 m³/hr) = 372 m³/hr by default, both counts and rates editable. For an API 2021/NFPA 11 basis, NFPA 11 Table K-3 covers this but its figures weren't in the source provided — enter manually.