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Explosion Resistant Design of Offshore Structures

The place fuel explosions characterize a reputable hazard, platform topsides must be designed to resist explosion loading. There are points to contemplate: to begin with loading at the constitution and secondly loading and impression on apparatus. This Technical notice offers mostly with the 1st point yet is usually appropriate to the second one as the functionality of the constitution, e.g. deflection and acceleration, impacts the apparatus fixed on it. it's also correct to the review of the power and deformation skill of the gear goods themselves, e.g. pipes and vessels. This Technical observe covers either layout of recent systems and reassessment of present buildings.
Content:
• entrance subject
• Notation
• desk of Contents
• 1. creation
2. common concerns
three. functionality criteria
four. enter Loading requisites
five. fabric reaction to Dynamic Loading
6. Structural reaction
7. layout Code assessments
eight. Assessing the Adequacy of the constitution on the finish of the Explosion occasion
nine. useful concerns
• 10. Reassessment for elevated Loading and Structural Mitigation
• References
Appendices

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Design curves Figure B1 shows membrane stress and deflection vs. pressure resistance for various levels of boundary strain from ey tension to 2ey compression. For tensile boundary strain exceeding 5 the curve for E, may be used and for compression strain exceeding 2 5 the curve for 2% may be used. In this Figure % is 1374 x tension is positive and compression negative. o 0 0 10 20 40 Deflection (mm) 30 50 Tension is positive Compression is negative Figure B1 Pressure resistance, deflections and membrane stresses in I metre wide deck panels 8 mm thick subject to transverse boundary strain - Te~hnicaiNote 4 Appendix B-3 APPENDIX C CALCULATION EXAMPLES - Technical Note 4 Appendix C-1 CALCULATION EXAMPLES Introduction This Appendix contains 5 examples covering application of various aspects of the Technical Note.

In practice it is difficult to design and detail satisfactory C O M ~ C ~ ~ O Xbetween U proprietary blast walls and deck structures when membrane stresses are large. 5) should be avoided. Where membrane restraint is employed, a fire response analysis of the wall and surrounding structure will be required. If the member being detached by the blast is an extensive deck or a blast wall, the nett loading on the deck and the remaining parts of the module can be very large, with these items becoming large projectiles affecting other modules and the integrity of the platform as a whole.

The girders will be standard section, in this case with dimensions conforming to European Wide Flange Beams HE1 lOOM (American W 1100 x 300 x 369 kg). These are available in EEMUA 450EM and EMZ material. Section size will be set for 2 bar design pressure and the same section will probably be usable for the 3 bar case,with flange doubler plates where necessary. At the midline support where shear and bending moment is highest the flanges will be widened (insertplates) to increase section modulus in the maximum shear zone: this is because high web shear stresses reduce bending strength.

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