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Additional info for [Article] Studies of Magnitude in Star Clusters XII. Summary of a Photometric Investigation

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Even though the Directive was only published early in 2000, the start date will be 1 July 2003 for new plant or subsequently modified plant. Before that date, the Directive must be incorporated into national legislation by all Member States. For existing plant, there is a three-year period before they must comply with the minimum requirements of the Directive. For work equipment the Directive states that it shall comply with the minimum requirements from 1 July 2003, but if it is already in use before 30 June 2003, then the above mentioned selection criteria do not apply.

Obviously, the probability that some deformation of the equipment occurs is increased. Explosion venting is sometimes called the "natural" explosion protection. This is because without any protection, the equipment would fail and the explosion would be vented. Because of the venting, the maximum pressure during the explosion would be reduced (see Figure 7). To apply explosion venting in a controlled manner, however, is not as simple as this analogy suggests. It is imperative that a vent opening of sufficient size is available at the right time.

Progress is therefore much slower than needed and anticipated. Consequently, many standards will not be available at the time when the users need them. Although the standards are prepared under a mandate referring to the ATEX lOOa Directive, many are also applicable under ATEX 137. ) are being prepared in CEN TC305. To assess the adequacy of explosion protection measures, the relevant standards are again needed, for example standards on the sizing and positioning of vent panels. 8 CONCLUDING REMARKS The analysis of dust explosion hazards in a plant needs to take into account the actual plant conditions and all relevant environmental factors.

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