process risk and safety specialists

nuclear and radiation consultants

Consequence Modelling: Fire, Explosion, Smoke, Vapour Dispersion

Our personnel use the most appropriate method to model the consequences of accident scenarios. Whether this is using world-recognised software (Phast) or through development of specific algebraic models, we will undertake modelling to the level of detail required to assist you.

Bow-Tie Consulting’s personnel are very experienced in understanding the results of consequence modelling and how these results apply to your situation. We don’t just give you the consequence model results but we help you understand the model and how it affects your operation.

Often we aid our clients at early stages of project design through estimating the distances from equipment to specified consequences e.g. How far will the heat from a pool fire extend from a bunded storage.  Through undertaking timely assessments, the locations of storages and other potentially hazardous materials can be specified to reduce the operation’s risk.

Consequence modelling is used in many different ways by different organisations. During the design of new plants or improved processes, the separation of units can be guided by the consequences of potential explosion scenarios. The emergency planning process can be aided by knowing the distances that a toxic gas release could travel from the process units. Thirdly, the location of fire monitors and emergency alarm stations can be checked to ensure that they will not be exposed to excessive heat radiation levels.

Consequence modelling involves determining the impact to people, plant and surrounding area as a result of:

  • Fires from a release of a flammable material
  • Explosions from a release of a flammable material
  • Explosions from detonation or deflagration of explosives
  • Gas clouds from a result of toxic material.

Consequence modelling provided by Bow-Tie Consulting includes:

  • Pool fires
  • Jet fires
  • Flash fires
  • Vapour cloud explosions
  • Condensed phase explosions
  • Shrapnel ejected from an explosion
  • Fire balls
  • BLEVEs (boiling liquid expanding vapour explosion) and
  • Toxic gas releases.

Bow-Tie Consulting uses internationally recognized consequence modelling software (PHAST ™) supplemented by models developed for specific accident scenarios that are not included in PHAST.

The reports produced clearly show the development of the models including the assumptions used and the extent of the impacts around the location of the accident.