Dynamic inspecting: Determine the dynamic inspecting stage of the explosion point or the fire point. Under the principle of no damage, the traces and physical evidence found in the static inspecting process are carefully flipped and moved for inspecting and collecting, and the components and Some traces of physical evidence are carried out in a more in-depth and comprehensive study, and they are linked for observation, inspection, comparative analysis, and at the same time, using the technical means of on-site inspection, detailed photographing, photographing, measuring distance, magnifying observation, discovering and collecting traces, physical evidence, etc. evidence.
The specific contents of the dynamic inquisition are: (1) the damage of each explosive container, including the damaged shape of the container itself, the moving position, and the safety accessories. The length and width of the broken crack and the circumference and wall of the broken part of the container should be measured. Thick, and compared with the original size of the container, calculate the circumferential elongation and wall thickness reduction rate at the crack, and estimate the rate of change of the container.
(2) The observation and inspection of the fracture section shall be carried out in a timely and careful manner to prevent rust and fouling of the fracture. Carefully observe the color, gloss, cracks and patterns of the fracture section and the inner and outer walls near the fracture with a magnifying glass, and find out the cross-section characteristics to determine which of the plastic failure, brittle failure, creep damage, fatigue damage and corrosion damage. Destruction form. If necessary, remove some of the materials near the damage port for chemical analysis, mechanical properties testing, welding quality identification, and fracture analysis.
(3) The situation of safety accessories mainly includes: whether the pressure gauge has serious overpressure phenomenon, whether there is any long-term failure or not; whether the safety valve has opened the trace, whether there is serious failure, and whether the weight of the lever type safety valve is Moved for no reason. Re-test and disassemble the safety valve to see its internal corrosion, media adhesion, valve operation; whether the liquid level meter is connected to the main container, and whether there is false indication. Check the amount of liquid before the explosion by the mark, check the amount of residual liquid and the damage of the level gauge; whether the rupture disc or the burst cap of the venting device has been actuated. If there is no break and it is suspected that the operating pressure is not in compliance with the regulations, the test can be verified.
(4) Collect residues for further technical identification or analysis.
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