Phast v6.7 released with many improvements to consequence and risk calculations and including a new risk Study Manager

This is a significant update to the Phast product suite containing many improvements as well as a new Study Manager utility for combining risk results from multible studies.

We are pleased to announce the release of Phast v6.7 available for download. This is a significant update to the Phast product suite containing many improvements as well as a new Study Manager utility for combining risk results from multiple studies. Some of the main new features and enhancements are described briefly below. For more details see the Release Letter in the downloads to the right.

Phast and Phast Risk
Improvements Rainout Modelling - Over the last few years we have performed a number of research projects jointly with industry and academia to improve the modelling of rainout. The most recent of these has provided an improved version of the 1994 CCPS correlations to characterise droplet size and size distribution. This new correlation is included in Phast v6.7 as the default option.

Warehouse Model improvements – These include:

• Extension to the model for instances when there is not enough material present for the specified fire duration
• Enabling ERPG equivalent mixture concentration and mixture lethality contours

In-building model improvements – These include:

• Release duration is set so that the contribution of re-evaporating liquid from instantaneous release is considered
• The release duration can never be more than the maximum release duration set in the parameters and, for continuous releases, never less than one air change

Unified Dispersion Model version 2 made default - UDM version 2, introduced in Phast 6.6, is now the default selection for dispersion modelling.

Updates to the materials physical property system - Physical property data has been updated for toxic probit of CO2 and N2 to account for their asphyxiate potential.

Modified Pool Location in case of Bunds – Previously, for rainout inside a bund, the bund was centred at the rainout location. In v6.7, the bund centre remains the release location and the more correct assumption that the pool would spread upwind from the downwind bund wall is applied.

Phast Risk Only
Improved workflow for transferring risk results to Extended Reporting - The process by which results databases are managed has been extensively re-designed. These improvements increase efficiency in usage of Phast Risk and avoid issues arising whilst working with very large studies.

New 3D Cloud ME/Purple Book Explosion Method - This method adopts a similar approach to the default 2D Effect Zone Model in that no location specific congested volumes are described. However, the explosion energy is derived from the three dimensional cloud envelope and uses the Multi Energy explosion method to calculate explosion overpressures, resulting in more conservative results.

The Study Manager - This utility can be installed with Phast Risk and is used to combine risk results from multiple studies. Applications include:

• Separating studies between different project teams and later combining results
• Investigating the joint impact of adjacent facilities
• Looking at large scale combination of studies for land use planning
• Provide a risk result viewer/analysis tool for those who are not Phast Risk users

Study Manager