Explosion barriers

The first task in applying a spacing table to a facility is to ensure it corresponds to the philosophy of protection adopted by the company. Where limited space is available to provide the required spacing, an examination of the equivalent fire and explosive barriers or active fire suppression system should be confirmed. This analysis should be accepted by the company as part of the design risk analysis. 

In establishing process spacing philosophy or if used, the ratings of fire and explosion barriers (as may be the case offshore), fire suppression effectiveness, a number of principle factors should be considered. These... 

Generally hydrocarbon floors areas are open grated construction when elevated, unless solid floors are provided where there is a need for spill protection or a fire or explosion barrier, otherwise ventilation requirements will prevail. 

Fig. 9.35 The initial pressure on the interfaces of the explosive-barrier from different materials (from polystyrene to tungsten).

Calculated results on shock wave loading of different inert barriers in a wide range of their dynamic properties under explosion on their surfaces of concrete size charges of different explosive materials in various initial states were obtained with the use of the one-dimensional computer hydrocode EP. Barriers due to materials such as polystyrene, textolite, magnesium, aluminum, zinc, copper, tantalum or tungsten were examined (Fig. 9.35). Initial values of pressure and other parameters of loading on the interface explosive-barrier were determined in the process of conducted calculations. Phenomena of propagation and attenuation of shock waves in barrier materials were considered too for all possible situations. 

The xenon hexafluoride for this synthesis is best prepared by reaction of xenon with an excess of fluorine at 300° in a nickel or Monel apparatus. Extremely pure XeFs is not required. Xenon hexafluoride attacks glass, and should be stored in a nickel or Monel container until ready for use. The hydrolysis reaction is violent, and if more than a hundred milligrams of XeFe is to be hydrolyzed, special safety precautions must be taken. Face shields, heavy gloves, and a sturdy plastic explosion barrier between the hydrolysis apparatus and the experimenter are strongly recommended. No more than about 3 g. of XeFg should be hydrolyzed in one batch. 

Explosion barriers should always be installed if two coupled process units are to be separated in such a way that a dust explosion cannot propagate from one unit to the other. 

ABSTRACT Based on the studying on barrier device of gas explosion, an optimized design scheme of gas explosion barrier door with foam ceramics as the main body is proposed. The author uses ANSYS software and finite element method to simulate and compare the main performances of four typical doors in thickness, such as uniform thickness, thick in the upper and thin in the lower, thin in the upper and thick in the lower, secant circular. Results of simulation reveal that the moistest stability and good withstand voltage in structure dose the secant circular door have, describe optimization in detail and provide a feasible optimization of barrier device of gas explosion. 

Work with explosives shall be hunted to the minimum quantities needed. For small quantities used in a hood, an explosion barrier in the hood, with personnel wearing protective eye wear, face masks, and hand protection, may be sufficient protection. For larger quantities, the facility must be specifically designed for the research program. 

Instructions Please list below the explosion hazards that exist at the facility location. Explosion hazards are a combination of (1) an initiating event, and (2) explosive material. For example, and initiating event could be a dropping accident and the explosive material could be 25g of PETN. Additional notes could describe possible secondary effects of the explosion (e.g., fire, structural damage), explosive barriers, etc. Attach additional sheets if more space is needed to document explosive hazards. 

The shock pressure P can be calculated from Hugoniot data for explosive, barrier and projectile. Details of these data are included in reference (5). Figures 5-7 show both experimental and calculated plots of threshold impact velocity against barrier thickness. 

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