Facility Siting / QRA

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Facility Siting Studies

Facility siting studies are evaluations of the flammable, overpressure, and toxic hazards and risks that a facility presents to personnel onsite and offsite using good industry practices, e.g., API RP752, RP753, RP756, and others.

PSRG can perform these studies on either a purely Consequence-based, Risk-based, or a combination of both, depending on the Client needs and information available. 

Results can include, but are not limited to: 

  • API 753 Portable Building Zone 1 Contour 
  • Building Damage Level (BDL) Contours 
  • Thermal Radiation Contours 
  • Toxic Impact Contours 
  • Individual Risk (IR) Contours for each Building Type 
  • Societal Risk FN Curves 

Risk and Consequence Based Studies

In both Risk and Consequence based Facility Siting Studies, PSRG provides a comprehensive and easy to understand evaluation of process hazards, and the potential impact those hazards can have on onsite buildings.

In the event a building can be impacted in excess of the applicable overpressure, flammable, toxic, or risk thresholds, PSRG will work with our client to ensure they understand the source and nature of the hazards, and evaluate the appropriate mitigation measures.  

In addition to PSRG utilizing gaussian software, such as PHAST and SAFETI, for QRA we are also experienced in suing FLACS®. 

The Computational Fluid Dynamics (CFD) software FLACS is used when either complex geometries (such as offshore facilities) are present and Gaussian dispersion model are not appropriate, or when further analysis is required on certain large contribution scenarios. 

PSRG has performed facility siting studies on a wide variety of facilities which have greatly benefited. These include, but are not limited to:  

  • Natural gas liquefaction and storage (Vapor Cloud Explosion Overpressure Analysis)
    Determined which occupied buildings could be impacted by overpressure exceeding design. 
  • Gas production and storage (Overpressure and Toxics Study)
    Determined the potential overpressure and impulse impacts on occupied buildings. 
  • Condensate storage and trucking (Storage and Trucking Facility Blast Study)
  • Recommended fire-resistant fortification of building that could be impacted by large jet fires. 
  • Power generation
    Determined if placement of equipment was adequate enough to prevent potential damage to occupied buildings 
  • HDPE rubber production
    Notified which portable buildings were within API RP 753 Zone 1 
  • Refrigerant blending and storage
    Recommended measures to prevent vapor ingress into occupied building 

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