Process Safety in Pharmaceutical Industry: Audit, Consulting & Compliance Guide

India's pharmaceutical industry plays a critical role in the global healthcare ecosystem, supplying over 20% of the world's generic medicines. But this scale and impact presents a growing safety challenge that cannot be ignored.

The 2025 Sigachi Industries explosion in Telangana claimed more than 50 lives. Government data shows that over 400 industrial deaths occurred in 2024, with multiple incidents reported in pharmaceutical clusters across Andhra Pradesh and Gujarat.

The nature of pharmaceutical manufacturing makes these risks more complex. Plants routinely handle volatile solvents, reactive intermediates, and high-pressure, temperature-sensitive reactions. Even a minor deviation in such environments can escalate quickly into a serious incident.

Regulatory expectations are becoming stricter. There has been a 40% increase in USFDA audits, with 206 global inspections conducted in 2024, signalling tighter global scrutiny. In India, the revised Schedule M GMP guidelines are pushing manufacturers to adopt more structured and risk-based safety approaches — through process safety audits, strong compliance frameworks, and expert consulting to manage risk effectively across the lifecycle of operations.

Process Safety Audits: Identifying Risks Before They Become Incidents

Process safety audits are vital for an effective safety programme in pharmaceutical manufacturing. Their primary objective is to identify what can go wrong before it actually happens.

In highly sensitive environments like pharma plants, risks are rarely obvious. A reactor may appear stable from the outside but could be operating dangerously close to its thermal limits. A powder handling system may seem routine but can carry a high risk of static ignition if not properly controlled. Audits focus on uncovering hidden risks that are not visible during day-to-day operations but can lead to major incidents if left unaddressed.

What Do Process Safety Audits Cover?

A structured process safety audit evaluates the 20 elements of the CCPS Risk-Based Process Safety (RBPS) framework — assessed not in isolation but as interconnected components that collectively define how well a plant manages risk.

At a practical level, audits examine:

• Process Safety Information (PSI) to ensure all chemical and process data is accurate and complete
• Hazard identification systems to confirm risks are properly understood
• Mechanical integrity programmes to verify equipment reliability
• Operating procedures to check whether processes are being followed correctly
• Emergency preparedness systems to assess response capability
• Training and competency frameworks to ensure personnel readiness

In pharmaceutical plants specifically, audits pay close attention to:

• Batch reactors handling exothermic reactions, where uncontrolled heat can lead to runaway conditions
• Solvent recovery systems, where flammable vapour management is critical
• Granulators and powder handling systems, which carry dust explosion risks
• Spray dryers and tablet compression units, where ignition sources and fine particles coexist

Step-by-Step Approach for Process Safety Audits

A process safety audit follows a structured, layered approach combining documentation review, technical validation, and field verification.

Step 1

Document Review

The audit begins with a detailed review of available documentation to establish whether the plant has a strong foundational understanding of its processes. Key documents reviewed include:

• Safety Data Sheets (SDS), which define chemical hazards
• HAZOP and LOPA reports, which outline identified risks and protection layers
• MSIHC Rules compliance documents, ensuring regulatory alignment
• Process flow diagrams, which map out operational pathways

Step 2

Technical Data Validation

Once documentation is reviewed, the audit moves into technical validation — where theoretical safety is tested against actual process behaviour. Key analytical methods include:

• Differential Scanning Calorimetry (DSC) to determine thermal stability and decomposition onset temperatures
• Reaction Calorimetry (RC1) to measure heat generation during chemical reactions
• Hammer Fall Tests to evaluate impact sensitivity of reactive or energetic materials

This step is crucial because many incidents occur when actual process behaviour differs from assumed conditions.

Step 3

Site Inspection

After validating technical data, the audit shifts to physical verification within the plant. Key areas inspected include:

• Ventilation systems, ensuring vapour concentrations remain below the Lower Explosive Limit (LEL)
• Reactor systems, including pressure handling and containment integrity
• Earthing and grounding systems, especially in powder handling areas to prevent static buildup
• Interlocks and safety shutdown systems, which act as last lines of defence

This stage often reveals gaps between design intent and actual implementation.

Step 4

Process Hazard Analysis (PHA)

PHA is one of the most critical components of an audit. Tools like HAZOP are used to systematically evaluate process deviations. Auditors analyse parameters such as temperature variations, flow disruptions, and pressure deviations. For example:

• A "High Pressure" deviation in a hydrogenation reactor may indicate a risk of vessel rupture
• Safeguards such as Pressure Safety Valves (PSVs) are evaluated for effectiveness
• Risk frequency is quantified and targeted below 1E-4 per year using LOPA methodologies

Step 5

Gap Identification and Closure

An audit is only valuable if it leads to action. Once gaps are identified, detailed closure plans are developed. Typical actions include:

• Resolving grounding issues in powder handling systems
• Installing additional sensors for early detection
• Improving ventilation to control vapour accumulation
• Updating Standard Operating Procedures (SOPs) to reflect current risks

Follow-up mechanisms are also defined to ensure these actions are implemented effectively.

Process Safety Consulting: Converting Risk Insights into Practical Controls

Process safety audits help identify risks, but consulting ensures those risks are actually addressed in a structured and technically sound manner. In pharmaceutical manufacturing, where reactions, solvents, and scale introduce multiple layers of complexity, internal teams often require specialised expertise to translate audit findings into workable solutions.

Process safety consultants bring this technical depth — helping organisations move from understanding risk to actively controlling it across operations.

What Does Process Safety Consulting Involve?

Consulting focuses on three key areas: risk identification, system design, and operational improvement — not as standalone activities but as part of a continuous improvement cycle. Consultants typically begin by strengthening hazard identification through:

• HAZID (Hazard Identification) to map all possible risks
• HAZOP (Hazard and Operability Study) to analyse process deviations
• LOPA (Layers of Protection Analysis) to quantify risk and define protection layers

For example, in a solvent handling process, consultants may identify a vapour cloud explosion scenario — then define causes, consequences, and independent protection layers such as sensors, alarms, and shutdown systems to reduce risk to acceptable levels.

Designing and Strengthening Safety Systems

Once risks are understood, the next step is designing controls that are both reliable and practical. This often includes:

• Implementing Safety Instrumented Systems (SIS) with defined integrity levels such as SIL-2 for critical shutdowns
• Introducing automated control mechanisms such as PID systems to manage temperature and pressure deviations
• Enhancing pressure relief and venting systems for reactors and dryers

Advanced Risk Analysis and Process Understanding

Pharmaceutical processes often require deeper technical evaluation, especially when dealing with powders, reactive chemicals, or scale-up operations. Consultants conduct specialised studies such as:

• Dust Hazard Analysis (DHA) to evaluate explosion risks in powder handling systems
• Reaction risk assessments using ARC and calorimetry data to predict runaway conditions
• Quantitative Risk Assessment (QRA) to model offsite impacts of chemical releases

Scale-Up and Operational Readiness

A critical role of consulting is ensuring safe transition from lab-scale to commercial production. Many incidents occur during this phase due to changes in reaction behaviour at higher volumes. Consultants validate reaction stability across scales, heat generation and dissipation capacity, and equipment suitability for larger batches. They also support operator training and emergency planning, ensuring teams are prepared for abnormal situations.

Compliance: Turning Safety Requirements into Daily Practice

Pharmaceutical safety compliance means ensuring that safety is consistently built into how a plant operates every day. In India, this has become even more important with the revised Schedule M under the Drugs & Cosmetics Act (2023), which sets a clear direction for manufacturers to adopt risk-based safety systems.

Compliance now expects companies to move beyond basic GMP and adopt structured safety practices. This includes:

• Conducting risk-based Process Hazard Analysis (PHA) for all critical operations
• Maintaining controlled environments, such as Grade A cleanrooms with 15 air changes per hour (ACH)
• Ensuring full traceability across processes, especially for companies aiming for WHO certification

Compliance also requires strong technical documentation. Plants must maintain detailed Process Safety Information (PSI), including reaction data such as RC1 studies for high-risk processes. At the operational level, safety controls such as LEL monitoring in solvent areas (kept below 10%) are essential to prevent fire or explosion risks.

Key Compliance Pillars in Practice

To ensure safety is consistently managed, compliance frameworks are built around structured systems that directly impact daily operations:

• Mechanical Integrity: Regular inspection of reactors and equipment using methods like RT and UT, following standards such as API 510
• Operating Procedures: Clearly defined SOPs, supported by Management of Change (MOC) to safely handle any process modification
• Incident Investigation: Using structured methods like the 5-Why analysis to understand and prevent recurrence of near-misses

Following the Sigachi incident, stricter enforcement has been observed. Plants in Telangana are now required to conduct HAZOP studies for all batch reactors, along with adopting safer practices like closed-loop transfer systems to reduce vapour leaks. Compliance also extends to storage and infrastructure safety — under Petroleum Rules, flammable liquids must be stored with proper containment systems, such as diking with more than 110% capacity.

Role of Advanced Safety Systems in Compliance

Modern compliance is increasingly data-driven, but the real challenge is implementation. It is not enough to understand frameworks — organisations must embed them into daily operations.

• Companies can start by conducting LOPA studies during or after HAZOP reviews to verify whether existing protection layers are sufficient. This typically involves cross-functional workshops with process, safety, and operations teams to validate each safeguard.
• Safety Instrumented Systems (SIS) should be implemented by first identifying critical risk scenarios such as overpressure or overheating, then assigning appropriate SIL levels — requiring collaboration between engineering teams and external experts to design, test, and periodically validate these systems.
• FMEA (Failure Mode and Effects Analysis) is applied to utilities like WFI loops to prevent contamination risks.

Compliance is also linked to global expectations. Companies exporting to regulated markets must align with EU-GMP standards and be prepared to respond to USFDA observations (Form 483) with complete documentation and corrective actions.

Monitoring Compliance Through Measurable Metrics

Compliance is not a one-time effort. It requires continuous monitoring using defined performance indicators:

• Maintain a PHA register to ensure 100% coverage of critical processes
• Use digital trackers or audit tools to monitor closure timelines — targeting 90% of findings closed within 90 days
• Run regular training programmes and assessments to ensure workforce readiness

C. Rajadurai (Reviewed by)

Sr. Manager – Environmental Consulting | Chola MS Risk Services

C. Rajadurai is an environmental consultant with ten years of experience in environmental engineering and sustainability consulting. His expertise spans carbon footprinting, net-zero strategy, water stewardship (AWS Certified Professional), Environmental Impact Assessments across sectors including ports, power plants, and FMCG, and geospatial studies using Remote Sensing and GIS. He is an ISO 14064 certified lead verifier for GHG accounting and a QCI/NABET approved expert for Land Use & Land Cover.