Download A Guide to Quantitative Risk Assessment for Offshore by John Spouge DNV Technica PDF

By John Spouge DNV Technica

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Effects of failure on other components. Necessary preventative/repair action. Rating of frequency of failure. e. consequence) of failure. Failures are rated as critical if they have high frequency or severity ratings. In these cases, special protection measures may be considered. As FMEA/FMECA can be conducted at various levels, it is important to decide before commencing what level will be adopted as otherwise some areas may be examined in great detail while others are examined at the system level without examining the components.

Are PSVs located outside the area of the equipment they protect? If so, it is possible that operators working on the equipment may not be aware that a PSV has lifted, is removed or isolated. E. What is the blast pressure rating of the fire walls? Is it consistent with possible overpressures in the area? F Is there an emergency procedure for retrieval of divers in the water when an incident occurs? Does this include early warning upon a process upset? G. In a major fire, the stand-by vessel or fast rescue craft may be unable to approach due to the intense heat.

Guide to Offshore QRA 40 • Guide words are defined in advance, based on the safety objectives for the installation. • Hazard scenarios (equivalent to deviations in a HAZOP) are obtained by combining guide words for the generic hazard, the cause and the consequence. 7. 7 Example HAZID Guide Words GENERIC HAZARD Loss of containment Fire/explosion Mechanical impact Structural failure Transport Diving Natural/environment Simultaneous operations Human error CAUSE General Design/construction Operation/maintenance Simultaneous operations Human error Hardware failure Control system failure Structural failure Loss of containment Blowout Shallow gas etc Impact Ship impact Helicopter impact Dropped load etc Structural failure Weather Earthquake etc CONSEQUENCE Gas & smoke ingress Fire/explosion Loss of buoyancy Loss of position Pollution Structural collapse Safety systems impaired The emphasis of the discussion is on how events could happen, rather than whether they could occur, and on what their consequences would be.

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