VDI (Society of German Engineers) submitted a new version for pressure release of dust explosions in November which will replace the June edition. The VDI Guideline “Pressure Release of Dust Explosions ” published in. June [l] describes one of the possible constructional protective measures. 1 Apr Does anyone have the english version of VDI standard and / or the NFPA I would compare the results of two calculations Tks in.

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Pressure release of dust explosions | VDI

This hierarchy relates to intentional or unintentional releases, vdi 3673 the precautions to vdi 3673 an explosion inside the process plant are not the same. Prevention of fires and explosions in bdi, Abbott, J. Operators need to draw a clear distinction between pressure relief designed to protect against an explosion, and relief designed to protect plant from some other cause of overpressure. Hazards that merit consideration include: It has much information about explosions presented simply with good graphs and diagrams.

Section 10, Paragraph This Technical Measures Document refers to the explosion relief measures that can be adopted in vdi 3673 design to ensure safe operation. More recently, work within CEN has produced a rationalisation and simplification of the design equations recommended, and this standard should be adopted when it becomes available.

Explosive relief

Historically, explosion relief has been used as a mitigation measure in three main types of plant: A dust explosion could then be an initiator of a major accident.

Dust may be grouped into dust vdi 3673 classes as determined using standard test apparatus. Vdi 3673 hazards should be identified and documented, vdi 3673 subsequent evidence of implementation of control measures.

Explosion vent panels and doors are considered as autonomous protective systems within the meaning of the ATEX equipment regulations. Explosion relief This Technical Measures Document refers to the explosion relief measures that can be adopted in plant design to ensure safe operation.

Explosion relief

If products show properties that indicate they can explode in the solid phase i. Paragraphs 60 to 87 discuss explosion relief and plant design and layout.

HSE aims to reduce work-related death, injury and ill health. 373

Substitution of combustible materials; Control of concentration, e. This asks for a lightweight roof for HFL stores. Pressure vdi 3673 needs to take into account the nature of the reaction mixture involved, e.


Protective devices have to work very rapidly; Much larger sizes of vent panels or doors are needed in order to work successfully and Duct work downstream from the relief panel needs careful design to avoid throttling the vdi 3673 and preventing the relief acting fast enough; Historically, explosion relief has been used as a mitigation measure in three main types of plant: Good general introduction to the subject, but not detailed enough for design purposes.

Unstable substances When unstable substances are in use, the vdi 3673 should demonstrate that at the research stage of the product a systematic approach to the identification of hazards relating to the nature of the materials has vdi 3673 followed. Gives specific advice, but with a tendency to ignore all non German sources of research data and guidance.

In particular the possibility vdi 3673 pressure piling needs to be considered.

This is because it is often impossible to prevent the formation of dense vdi 3673 clouds inside the process. Many different equations have been published, each with a restricted range vdi 3673 applicability, and plants will be found which have used all these design equations. Explosion relief from buildings HSE’s traditional advice for buildings storing flammable liquids has been to ask vdi 3673 a lightweight roof, which will act as explosion relief if a vapour cloud ignited within the building, and this has not changed as a result of DSEAR.

In extreme cases, explosion flames can accelerate to detonation, generating vdi 3673 high pressures and explosion relief is unlikely to be a suitable method of protection in vdi 3673 case. Explosions are rapid events and consequently: The dust must be explosible refer to table on dust explosion classes ; The dust must have a particle size distribution that will allow the propagation of flame The atmosphere into which the dust is dispersed as a cloud or suspension must contain sufficient oxidant to support combustion; The vdi 3673 cloud must have a concentration within the explosible range; The dust cloud must be in contact with an ignition source of sufficient energy to cause an ignition.

A dust explosion involving a non-toxic dust like polyethylene vdi 3673 not result in a major accident as defined in the regulations, unless it also led to loss of containment of a COMAH substance.

A European harmonised standard for solvent evaporating ovens prefers vdi 3673 precautions for many applications, but in vd dust handling industries explosion relief remains a widely used mitigation measure. Vdi 3673 Thermal and pressure conditions; Flammability; Toxicity; Environmental problems.


However, it is worth noting that even finely powdered solids are significantly less easily dispersed than vdi 3673 gases and volatile liquids – with shorter hazard ranges as a result. Health and Safety Executive. BS EN 1 recognises the need for explosion relief for some designs of ovens, and recommends using NFPA 68 as no European standard was available at the time the standard was approved. The size of vent area required for effective control vdi 3673 upon a number of factors including:.

Section 5, Paragraph Explosion vent vd sizing panels for dusts and powders A considerable amount of experimental data has been used to develop empirical design equations. The reports on vdi 3673 Manro and Chemstar incidents cdi the possibilities with distillation plant, but inadequate explosion relief was vfi the prime problem in this case.

This is acceptable, and vddi of the advice is contained in the other sources quoted. Influential and widely used. Normally the following options should be considered to prevent an explosion inside vdi 3673 plant: The dust itself, or mechanical moving parts in contact vddi the dust often create ignition risks that cannot be eliminated completely.

In assessing the risks from an explosion, Operators should consider flame propagation, pressure effects, recoil forces and the materials that would be released. The adoption of measures such as vdo is likely to be necessary where the process of venting could itself lead to the release of sufficient toxic material to create a major accident. An explosion of gas or vapour 373 release vdi 3673 combustion products, but vdi 3673 burning is only likely if vdi 3673 is a continuing source of release, perhaps because nearby pipework has been damaged.

The relevant Level 2 Criteria are: When vdi 3673 substances are in use, the operator should vdi 3673 that at the research stage of the product a systematic approach to the identification of hazards relating to the nature of the materials has been followed.

Dust Explosion Prevention and Protection: This website uses non-intrusive cookies vdi 3673 improve your user experience. Comments that ‘explosion relief into the workrooms shall not be permitted 6373 there vdi 3673 proven evidence that persons cannot be endangered’.

Also some brief video clips of explosion experiments.