1 of 33 API RP-2FB Blast Calculations Using ASCE "Design of Blast Resistant Buildings in Petrochemical Facilities" CLIENT: PROJECT: 8.3 psi (SLB) LOCATION: BY: DATE: Strength Level Blast Parameters Building Geometry Height H 8.5 ft Width Perpendicular to Blast B 19.875 ft Width Parallel to Blast L 8.00 ft Blast Parameters Magnitude of Blast 0.2615 Bar FRONT WALL LOADING Peak Side On Overpressure Pso .29 Bar X 14.5psi/bar = 3.79175 psi Positive Phase Duration td 0.1315 sec Shock Front Velocity U U=1130*(1+0.058*Pso)^0.5 1248 ft/sec (1130*(1+0.058*3.792)^0.5) Blast Wave Length Lw Lw=U*td 164.12 ft 1,248*0.13 Blast Wave Reflection Coefficient Cr Cr=(2+0.05*Pso) 2.2 Drag Coefficient Cd +1.0 front wall or -0.4 all o 1.0 Peak Reflected Pressure Pr Pr=Cr*Pso 8.30 psi Dynamic(Blast Wind) Pressure q0 q0=0.022*Pso^2 0.316 psi 0.022*3.792^2 Stagnation Pressure Ps Ps=Pso+Cd*q0 4.11 psi 3.79+1.0*0.316 Clearing Distance S S=(the smaller of H or B/2) 8.50 ft Clearing Time tc tc=3*S/U<td 0.020431290285 sec IF(3*8.50/1248.09<=td Impulse (Area under Pressure-Time Curve Iw Iw=0.5*(Pr-Ps)*tc+0.5*Ps*td 0.3130 psi-sec. 0.5*(8.30-4.11)*0.02+0.5*4.11*0.13 Duration of Equivalent Triangle(equivalent dte te=2*Iw/Pr 0.0753886258 sec
Blast-SLBAPI RP-2FB Blast CalculationsUsing ASCE "Design of
Blast Resistant Buildings in Petrochemical
Facilities"CLIENT:PROJECT:8.3 psi (SLB)LOCATION:BY:DATE:Strength
Level Blast ParametersBuilding GeometryHeightH8.5ftWidth
Perpendicular to BlastB19.875ftWidth Parallel to BlastL8.00ftBlast
ParametersMagnitude of Blast0.2615BarFRONT WALL LOADINGPeak Side On
OverpressurePso.29 Bar X 14.5psi/bar =3.79175psiPositive Phase
Durationtd0.1315secShock Front
VelocityUU=1130*(1+0.058*Pso)^0.51248ft/sec(1130*(1+0.058*3.792)^0.5)Blast
Wave LengthLwLw=U*td164.12ft1,248*0.13Blast Wave Reflection
CoefficientCrCr=(2+0.05*Pso)2.2Drag CoefficientCd+1.0 front wall or
-0.4 all others1.0Peak Reflected
PressurePrPr=Cr*Pso8.30psiDynamic(Blast Wind)
Pressureq0q0=0.022*Pso^20.316psi0.022*3.792^2Stagnation
PressurePsPs=Pso+Cd*q04.11psi3.79+1.0*0.316Clearing DistanceSS=(the
smaller of H or B/2)8.50ftClearing Timetctc=3*S/U
