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Peak overpressure (Kinney-Graham)

Free-air peak side-on overpressure as a function of scaled distance Z, for civil-protection standoff and damage-zone planning.

Civil-protection / accidental-explosion scope only (UFC 3-340-02, public release). Weapon-effects and penetration calculations are out of scope.

Method: Kinney & Graham (1985) empirical correlation — a published closed-form fit to free-air airblast data, NOT the exact Kingery-Bulmash / UFC 3-340-02 curve. Best accuracy roughly 0.5 < Z < 40 m/kg^(1/3).

Inputs

Scaled distance Zm/kg^(1/3)

Compute Z with the scaled-distance tool first (Z = R / W^(1/3)).

Ambient pressure P0kPa

Sea level standard = 101.325 kPa.

Results

Overpressure ratio ΔP/P0—

Peak overpressure ΔP— kPa

ΔP [bar]—

Citations

K&GΔP/P0 = 808·[1+(Z/4.5)²] / {√[1+(Z/0.048)²]·√[1+(Z/0.32)²]·√[1+(Z/1.35)²]}. Kinney & Graham (1985), Explosive Shocks in Air.

VERIFYCross-checked against an independent implementation: Z=10 → ΔP≈9.99 kPa; Z=5 → 29.24 kPa.

Engine: blast.js v0.1.0 · Method: Kinney-Graham 1985 · Date:

Scaled-distance tool

Preliminary calculation tool. Results are for preliminary sizing and cross-check only. Final design, sealed responsibility, and permit submissions require the full official text of the referenced regulations and the review of a licensed engineer.