A PSDR (Process Safety Design Review) Study is a structured engineering review conducted to verify whether a facility design adequately addresses process safety, safe operation, personnel protection, asset integrity, and environmental protection. In industries such as oil & gas, LNG, petrochemical, chemical, and industrial facilities, many operational safety risks originate during the design stage due to issues like inadequate isolation, unclear shutdown philosophy, incomplete safeguarding logic, or weak fire and safety integration.
A PSDR study helps identify and address these concerns before construction, commissioning, or operation, when modifications are more practical and cost-effective. iFluids Engineering & Consultancy WLL provides technically focused, workshop-based PSDR services for projects across Qatar, the GCC, and international markets, supporting project teams in improving overall design safety and operational reliability.
What is Process Safety Design Review (PSDR) Study?
A Process Safety Design Review (PSDR) Study is a structured engineering review conducted to verify that a facility is designed for safe, reliable, and compliant operation. The study focuses on process safety, shutdown systems, protection layers, operating requirements, and key safety interfaces to identify design-stage gaps that could affect personnel safety, asset integrity, environmental performance, or overall plant reliability.
During the study, the facility is divided into defined sections called nodes. For each node, the review team discusses the design intent, applies relevant process safety guidewords and evaluates whether adequate measures are available for:
- Prevention of abnormal or unsafe conditions
- Mitigation of potential consequences
- Recovery of the facility to a safe condition
A PSDR study is highly valuable during FEED, detailed engineering, brownfield modifications, package integration, and pre-construction stages to ensure the design aligns with operating, safeguarding, ESD, and Fire & Safety philosophies. For oil & gas, LNG, petrochemical, and industrial facilities, it provides early assurance that process safety requirements are properly addressed before construction, commissioning, or operation.
Why PSDR is Important for Process Facilities
A facility may look complete on drawings, but still contain hidden safety gaps. PSDR helps identify those gaps before they become field changes, commissioning delays or operational hazards.
The review checks whether the design is practical from an operating and safety perspective. It evaluates how the facility will respond during abnormal conditions, equipment isolation, emergency shutdown, fire or gas detection, utility failure, blocked flow, pressure build-up or maintenance intervention.
For projects in Qatar and GCC, PSDR also supports stronger technical assurance, client review readiness and compliance with project safety expectations. It gives owners, EPC teams and operators confidence that safety has been considered before the design is finalized.
Our PSDR Methodology
1. Document Review and Study Preparation
The PSDR study begins with a detailed review of available project documents to understand the process design, operating philosophy, control system, layout, isolation requirements and fire safety expectations. This stage helps define the review boundary and ensures the workshop is based on actual project information rather than a general safety discussion.
Typical documents reviewed include PFDs, P&IDs, design basis, layout drawings, process control narrative, isolation philosophy, fire and safety philosophy, safeguarding philosophy and method statements.
2. Node Identification and Design Intent Review
The facility is divided into logical process safety nodes such as process sections, equipment packages, utility interfaces, storage systems, transfer lines or safety-critical areas.
For each node, the design intent is discussed to confirm:
- Purpose of the system or equipment
- Normal operating conditions
- Flow path and process interface
- Control and shutdown requirements
- Isolation, vent and drain arrangements
- Key safety and operating limitations
This helps the review team assess each part of the facility in a structured and traceable manner.
3. Guideword-Based Process Safety Review
Once the design intent is established, guidewords are applied to each node to identify potential process safety issues and evaluate facility response under abnormal or unsafe operating conditions. The review examines deviations such as no flow, low flow, high pressure, reverse flow, blocked outlets, utility failures, incorrect isolation, loss of containment, and control or shutdown failures to determine whether adequate safeguards are in place to prevent or mitigate these scenarios.
4. Prevention, Mitigation and Recovery Assessment
Each identified concern is reviewed against three practical safety layers: prevention, mitigation and recovery.
- Prevention: Measures that avoid the event, such as proper design, controls, alarms, interlocks, operating limits and isolation arrangements.
- Mitigation: Measures that reduce the impact, such as relief systems, shutdown actions, fire and gas detection, containment and drainage.
- Recovery: Measures that help restore the facility to a safe condition, such as safe isolation, depressurization, emergency access and operating procedures.
This approach confirms whether the design has balanced protection and does not rely only on operator response or assumptions.
5. ESD and Safeguarding Review
A key part of the PSDR study is the review of Emergency Shutdown (ESD) levels and their integration with process equipment, isolation systems, fire and gas detection, utilities, and emergency response philosophy. The study also evaluates the adequacy of protection layers such as alarms, trips, interlocks, shutdown valves, relief devices, containment measures, and procedural controls to identify weak safeguards, unclear shutdown logic, and missing system interfaces.
6. Fire, Safety and Philosophy Compliance Check
The PSDR study verifies whether the design is aligned with applicable project safety philosophies and client requirements. This includes checking whether Fire & Safety Philosophy, Operating and Safeguarding Philosophy, Isolation Vent and Drain Philosophy and Process Control Narrative requirements are properly reflected in the P&IDs, layouts and shutdown logic.
Where applicable, the review may also include compliance checks against client standards or Shell DEP requirements.
7. Findings, Recommendations and Close-Out
All PSDR findings are recorded in a structured action register with clear recommendations such as P&ID updates, safeguard improvements, shutdown logic review, and layout modifications. iFluids also supports close-out reviews to ensure all agreed actions are addressed before project progression.
Documents Required for PSDR Study
A PSDR workshop usually requires the latest available project documents, including Process Flow Diagrams, Piping and Instrumentation Diagrams, Design Basis Memorandum, layout drawings, Process Control Narrative, Isolation Vent and Drain Philosophy, Fire & Safety Philosophy and method statements. Depending on project maturity, ESD philosophy, cause-and-effect diagrams, safeguarding philosophy, equipment datasheets and package vendor documents may also be reviewed.
The uploaded PSDR document also identifies key workshop documents such as PFDs, Design Basis Memorandum, P&IDs, layouts, Process Control Narrative, Isolation Vent and Drain Philosophy, Fire & Safety Philosophy and method statement.
Key Areas Covered in a PSDR Study
- Process design safety review
- P&ID safety assessment
- Shutdown philosophy and ESD interaction review
- Evaluation of layers of protection
- Fire and safety system interface review
- Isolation and draining requirement assessment
- Control narrative and operational alignment
- Layout and maintenance safety review
- Safe operation and operational reliability assessment
- Identification of engineering gaps affecting safety, assets, and environment
PSDR Deliverables
- PSDR review scope
- List of input documents reviewed
- Node-wise discussion records
- Key observations and process safety concerns
- ESD and safeguarding assessment findings
- Fire and safety compliance comments
- Action register and recommendation tracking
- Close-out status of actions (where applicable)
- Structured report for project owners, EPC contractors, engineering, and operations teams
Why Choose iFluids for PSDR Study?
iFluids Engineering & Consultancy WLL provides practical and engineering-focused PSDR studies that evaluate how facilities perform during normal, abnormal, shutdown, maintenance, and emergency conditions. The team delivers project-specific recommendations that improve design safety, operational reliability, and compliance while helping reduce design-stage risks before construction or commissioning.With experience across Qatar, the GCC, and international markets, iFluids Engineering & Consultancy WLL supports oil & gas, LNG, petrochemical, utility, and industrial projects with professional PSDR services that strengthen safety assurance, improve design quality, and enhance overall project readiness.