The First Fleet of R.O.K Navy (Inspection Team) (해군1함대 감시대)
Hyundai Oil Bank
Gunsan Battery Stabilization Center Project(JIAT) (군산 배터리 안정화센타)
ADD(국방과학연구소) 거아도 SLIDING BLAST DOOR
Steel Type Blast Door(3Bar) Hyundai oilbank PCD entranc
Concrete Type Blast Door(3Bar) NCD machine room entrance at 00 projec
Steel Type Blast Door(100Bar) Powder magazine entrance at 00 project
Steel Type Blast Door Embeddment plate NBC shelter Ground facility at 94-5951
S-OIL(Onsan factory) NHC Blast Door
Agency for Defense Development (ADD, 40 Bar) / INPA TUNNEL / Darakdae firing range
1. Design Criteria
1.1) Pressure Release
1.1.1) Internal pressure at the beginning
b = 12.67 bar = 186.2 psi
1.1.2) Internal pressure at the end
b = 1.0 bar = 14.7 psi
1.1.3) Duration of the pressure release from start
to end
T = 8.04 second
1.2) Property of the 19.0 thick steel plate.
Consider 12inches wide strip of the calculation
S = bd2 / 6 = 12 * 0.752 / 6 = 1.125 in3
I = bd3 / 12 = 12 * 0.753 / 12 = 0.422 in4
1.3) Wide of Doors L= 36.0 inch
2. Calculation of the bending stress and Deflection
2.1) Bending moment and stress of the steel plate
Assume pressure shall be linearly released at the speed
of 0.5 seconds interval over the entire pressure release
2.1.1) Uniform pressure release
W = 12 (186.2-14.7)/(8.04/0.5)= 128 lbs/in/0.5 second
2.1.2) Bending moment V
M = wL2/8 = 128 * 362/8 = 20,736 in-ibs
2.1.3) Bending stress
f= M/S = 20,736/1.125 = 18,432 lbs/in2
= 18.432ksi < 0.6*36(=21.6ksi) : O.K
2.1.4) Deflection of the plate = 5wL4/384EI
= 5*128*364/(384*29000000*0.422)
= 0.228 in = L/157 < L/120 : O.K
3. CONCLUSION
Based on the result of the calculation, the thickness of the plate, 19 mm for the Blast resistant doors are adequate.
