Julrajas Pressure release of dust explosions VDI Section 5, Paragraph Existing panels do not need to be replaced, but they should be suitable for fdi purpose. A dust explosion involving a non-toxic dust like polyethylene would not result in a major accident as defined in the regulations, unless it also led to loss vci containment of a COMAH substance. Substitution of combustible materials; Control concentration, e. Code of practice for fire precautions in the chemical and allied industries, British Standards Institution. Safety requirements, British Standards Institution.
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Significance and Use 5. Ref 6 provides supporting calculations showing that a test vessel of at least 1-m3 of volume is necessary to obtain the maximum explosibility index for a burning dust cloud having an abnormally high flame temperature. In these two overdriving and underdriving scenarios described above, it is therefore recommended to perform tests in 1-m3 or larger calibrated test vessels in order to measure dusts explosibility parameters accurately.
Ref 2 and unpublished testing has also shown that in some cases the KSt values measured in the L chamber can be lower than those measured in the 1-m3 chamber. Refs 1 and 3 found that for some dusts, it was necessary to use lower ignition energy in the L chamber in order to match MEC or MIC test data in a 1-m3 chamber. Scope 1. Results obtained by the application of the methods of this standard pertain only to certain combustion characteristics of dispersed dust clouds.
No inference should be drawn from such results relating to the combustion characteristics of dusts in other forms or conditions for example, ignition temperature or spark ignition energy of dust clouds, ignition properties of dust layers on hot surfaces, ignition of bulk dust in heated environments, etc. It is intended that results obtained by application of this test be used as elements of a dust hazard analysis DHA that takes into account other pertinent risk factors; and in the specification of explosion prevention systems see, for example NFPA 68, NFPA 69, and NFPA when used in conjunction with approved or recognized design methods by those skilled in the art.
Test Method E, which describes this method, has been withdrawn. The use of data obtained from the test method in the design of explosion protection systems is not recommended. No other units of measurement are included in this standard. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
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VDI 3673 Sheet 1
Gardaktilar This is because it is often impossible to prevent the formation of dense dust clouds inside the process. The relevant Level 2 Criteria are: A dust explosion could then be an initiator of a major accident. Explosion prevention and vdi Normally the following options should be considered to prevent an explosion inside the plant:. Basic input data required is the strength of vdi process equipment, the equipment volume, KST and P max bdi for the dust itself, and the opening pressure of the vent panel or door.
VDI 3673 BLATT 1