Design fire water flow rate for depots, terminals, and pipeline installations (OISD-STD-117 §4.3–4.4)
◉ OISD-STD-117 §4.3–4.4 STYLE CHECK · NOT A REGULATORY SUBMISSION TOOL
⚠ Indicative tool only, and distinct from the existing (OISD-116-based) Fire Water Demand calculator. OISD-116 is refinery-focused; this is OISD-117's depot/terminal/pipeline-installation methodology, with a genuinely different structure — notably a distance-based tiering for exposure protection (tanks within vs. beyond (R+30)m of the fire get different rates) that OISD-116 doesn't have. Every formula here was cross-checked against OISD-117's own two worked examples (Annexure I, floating-roof and cone-roof cases) to the m³/hr. The 0.97 factor converting foam solution flow to water flow is used exactly as the worked examples apply it; it reads as consistent with a 3% foam concentrate (97% water fraction) but the standard doesn't explicitly state that derivation on the pages reviewed — treat it as the example's own arithmetic, not an independently confirmed concentrate percentage.
Identification
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Tank on Fire — Cooling & Foam (§4.3.2.i, §4.4.4)
Result
Cooling water (3 lpm/m² of shell area)—
Foam area (seal area, floating — or full surface, cone)—
Foam solution water rate—
Subtotal — tank on fire—
Other Tanks in Same Dyke — Exposure Protection (§4.3.2.i–iii)
Tanks within (R+30)m of the fire tank's centre use the same 3 lpm/m² rate as the fire tank itself; tanks beyond that radius use a reduced 1 lpm/m² rate.
Per §4.3.2: the design rate is the largest of (i) tank farm total [fire tank + other tanks' exposure protection + foam], (ii) supplementary streams, (iii) gantry/equipment.
Result
(i) Tank farm total—
(ii) Supplementary streams—
(iii) Gantry + equipment—
Governing design flow rate—
Fire Water Storage & Pumps (§4.3.3–4.3.5, reference)
Result
Minimum residual header pressure7 kg/cm²g
Required storage duration—
Minimum effective storage volume—
Jockey pump capacity range (3–10% of design rate, min 180 lpm)—
Pumps: capable of 150% rated discharge at ≥65% rated head; shutoff head ≤120% (horizontal centrifugal) or ≤140% (vertical turbine) of rated head; minimum 50% standby (at least 1 unit); diesel-driven (or up to 50% electric where supply is reliable) with 6-hour fuel tank; located ≥30m from hydrocarbon equipment/storage.