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Fire and Gas Mapping Study
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Risk & Safety Management
The impact of toxic gas released from equipment exhausts or flare stacks can be evaluated using 2D or 3D simulation. A gas dispersion study compares predicted concentrations of specified components against company or industry criteria such as TWA and IDLH to safeguard workers in the vicinity. We also assess fugitive emissions to confirm that nearby equipment is correctly rated. PRISM’s Technical Safety Specialists conduct both 2D and 3D simulations tailored to your facility and operating scenarios, providing clear findings and practical measures to reduce risk exposure and improve on-site safety.
A gas dispersion study is a specialized technical assessment that predicts how toxic gases, vapors, or other hazardous substances spread and disperse in the atmosphere around your facility. Using advanced computational fluid dynamics (CFD) software, we model the behavior of gases released from various sources such as equipment exhausts, flare stacks, vents, or potential leak scenarios. This modeling accounts for meteorological conditions, facility layout, terrain, and operational parameters to determine where dangerous concentrations may accumulate.
The primary purpose of a gas dispersion study is worker protection. By predicting gas concentrations at ground level and throughout your facility, we can identify areas where personnel might be exposed to harmful substances. These predicted concentrations are then compared against established safety criteria such as Time-Weighted Average (TWA) limits, Immediately Dangerous to Life or Health (IDLH) thresholds, and company-specific exposure standards. This comparison reveals whether current facility design, equipment placement, and ventilation systems adequately protect workers.
Beyond direct toxic exposure assessment, a gas dispersion study evaluates fugitive emissions from equipment such as compressors, pumps, and vessels. These uncontrolled releases can affect nearby workers and installations. We assess whether equipment is correctly rated and positioned to minimize exposure risks and ensure compliance with environmental and occupational health regulations.
Gas dispersion studies are critical during the design phase of new facilities, expansion projects, and modifications to existing operations. They’re also valuable when evaluating facility modifications, equipment upgrades, or changes to operating procedures that might alter release patterns or exposure scenarios.
PRISM conducts both 2D and 3D simulations depending on your facility’s complexity and specific needs. Our technical safety specialists work with your team to understand operational scenarios, define realistic release assumptions, and interpret results in practical terms. Our technical safety specialists work with your team to understand operational scenarios, define realistic release assumptions, and interpret results in practical terms. We provide clear, actionable findings and recommend specific measures to reduce risk exposure, optimize facility layout, enhance ventilation, or implement additional safety controls.
Conduct gas dispersion studies during design to optimize facility layout, equipment placement, and ventilation systems. Early assessment prevents costly retrofits and aligns with inherent safety principles, protecting personnel before construction begins.
Assess existing facilities during acquisitions and divestments through gas dispersion analysis. Due diligence evaluates whether current operations adequately protect personnel and meet regulatory standards, supporting informed financial decisions and identifying upgrades.
Revisit gas dispersion studies when operational scenarios or facility configurations differ from original assumptions. Changes to equipment placement, operating procedures, or production rates alter dispersion patterns, requiring reassessment during construction and commissioning phases.
Implement gas dispersion studies whenever facility modifications, expansions, or process changes occur. Any alteration affecting gas release rates, stack heights, or meteorological exposure warrants reassessment to ensure continued worker protection and regulatory compliance throughout operations.
PRISM employs a systematic, science-based approach to gas dispersion modeling that delivers accurate predictions and actionable insights specific to your facility.
We begin by gathering comprehensive facility information: equipment specifications, operating conditions, meteorological data, and personnel locations. We work closely with your team to define realistic release scenarios, including normal operations, upset conditions, and potential leak incidents. This collaborative approach ensures our model reflects your facility’s unique characteristics and operational realities.
Modeling Using industry-leading computational fluid dynamics (CFD) software, we create either 2D or 3D simulations depending on your facility’s complexity. Our models account for terrain, building effects, wind patterns, atmospheric stability, and temperature variations. This detailed approach captures how gases actually disperse in your specific environment, not generic assumptions.
Our simulations predict toxic gas concentrations at ground level and throughout your facility over time. We compare these predicted concentrations against established safety criteria including Time-Weighted Average (TWA) limits, Immediately Dangerous to Life or Health (IDLH) thresholds, and company-specific exposure standards. We also evaluate fugitive emissions from equipment to confirm proper equipment ratings.
We translate complex modeling results into clear, practical findings. Our reports identify high-risk areas where personnel may face hazardous exposures and specify concrete mitigation measures such as enhanced ventilation, equipment relocation, or additional safety controls. We prioritize recommendations by risk reduction effectiveness and implementation feasibility.
Throughout the study, we maintain transparent communication with your engineering and operations teams. We explain methodology, discuss assumptions, and address questions to ensure you fully understand the analysis and resulting recommendations.
PRISM’s technical safety specialists combine rigorous science with practical engineering judgment to deliver gas dispersion studies that protect your workforce and support confident operational decisions.
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