SPECIAL DOORS

SAMHOON Mainly Works for CBRN Facilities, Special Doors And Thermal Sight

SPECIAL DOORS

Reference of Blast Door

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BLAST DOOR TYPE
  • 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
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.