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Effectively Evaluating Risks Under Degraded Operating Conditions

Effectively evaluating risks under degraded operating conditions

  • Fact sheet
A degraded situation is merely an initial phase that could lead to an accident with serious consequences. “Operating in a degraded mode” refers to a condition during which operations are ongoing despite there being no access to all necessary or normally expected functional resources upon completion of the corresponding risk analysis, whether such resources are organisational or technical. This fact sheet describes the main lessons learnt in pursuit of effectively evaluating risks under degraded operating conditions.
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47045

  • Accident report
  • FRANCE
The summary of this accident has not yet been translated. In the meantime, please refer to the French summary :

Dans une vinaigrerie de 3 000 m², une cuve de 150 m³ contenant 40 m³ de vinaigre d'alcool explose vers 9h40 lors de travaux de soudure. La cuve, de 13 m de hauteur et 4 m de diamètre, est projetée par effet missile. Elle traverse le toit et atterrit à 80 m du bâtiment, sur la ligne ferroviaire Nîmes-Grau du Roi. Les secours transportent à l'hôpital 2 employés blessés, dont l'un gravement brûlé. La circulation ferrovia [...]

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Pneumatic Explosion During An Intervention On A Pipe At A Pyrotechnic Plant

Pneumatic explosion during an intervention on a pipe at a pyrotechnic plant

  • Accident report
  • FRANCE
The summary of this accident has not yet been translated. In the meantime, please refer to the French summary :

Une explosion pneumatique se produit vers 16 h dans une usine pyrotechnique spécialisée dans la fabrication de poudre de chasse et de tir sportif à base de nitrocellulose. L'événement a eu lieu pendant une opération de sciage sur une conduite d'aspiration (tube vertical inox de 80 mm de diamètre), localisée dans le local extracteur d'un bâtiment de production. Au moment de l'accident, le site est en arrêt technique annuel, péri [...]

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Bringing gas-powered installations back online

  • Fact sheet
Repair, maintenance shutdown, adjustment of phase, often require the shutdown and restart of gas-powered installations. This procedure is frequently time consuming to implement, depending on the type of equipment considered (superheater, steam generator), and it can generate accidents. The following fact sheet analyzes some notable incidents in order to draw lessons from them. Date of the document: November 2011
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Operations in a degraded mode

  • Fact sheet
This fact sheet is the analysis of some accidents that illustrate the risks associated with the operation of installations in degraded mode (unavailability of equipment, utility, personnel ...). These degraded operating situations can arise from material failures, but also from organizational and human failures. In order to avoid accidents, and in the absence of being able to avoid degraded operation by appropriate arrangements, a specific road plan must be defined to carry on operations under a safety level equivalent to the reference.
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Risks analysis and works projects

  • Fact sheet
The accidentology during phases of work, be it maintenance, modification, installation or even dismantling of installations have been regularly mentioned and studied. This is due to the seriousness of this type of events, particularly in terms of human consequences. Focus on some relevant events. Date of the document: June 2013.
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Silos Storing Plant Products

Silos storing plant products

  • Flash
We need to pay special attention to the circumstances under which accidents in silos storing plant products take place. Experience shows that the frequency of accidents is far higher during the working phase including the preventive or curative maintenance, change, assembly or disassembly of facilities. This is also true for both staff technicians carrying out operations in the silo and subcontractors working in a sector where the risks are often underestimated.
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Explosion And Fire On An Acrylic Acid Tank At A Chemical Plant

Explosion and fire on an acrylic acid tank at a chemical plant

  • Accident report
  • JAPON

During his shift, an employee of a special chemical products plant noticed at 1:20 pm a release of white smoke through the vents on an intermediate storage tank containing acrylic acid (AA, C3H4O2, flammable and corrosive substance, boiling point: 141°C). The tank (70 m³, 75 mm stainless steel shell) had been filled in preparation for a distillation column filling test; moreover, it was heat insulated and inerted with nitrogen. The employee sounded the alarm; a crew of internal fire-fighters attempted to stop the exothermic polymerisation rea [...]

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