When companies think of Process Safety Management (PSM), the focus often gravitates toward preventing catastrophic releases of hazardous chemicals through mechanical integrity, management of change, and process hazard analysis. But the organizations that achieve best-in-class performance take a broader view—recognizing that the daily exposures faced by workers are just as important to long-term safety and operational excellence.
That’s where Industrial Hygiene (IH) practices, including Similar Exposure Group (SEG) sampling and analysis, become a best practice in modern PSM systems.
Bridging PSM and Industrial Hygiene
The OSHA Process Safety Management Standard (29 CFR 1910.119) emphasizes employee participation, process hazard analysis, operating procedures, training, and incident investigation. While the regulation’s main intent is to safeguard against catastrophic incidents, it also reinforces the employer’s responsibility to provide a safe workplace.
The Center for Chemical Process Safety (CCPS) goes a step further in its Guidelines for Risk-Based Process Safety (RBPS). CCPS identifies “Workforce Involvement,” “Hazard Identification and Risk Analysis,” and “Management of Change” as pillars of a comprehensive system. Incorporating IH exposure data through SEG sampling strengthens each of these pillars, helping companies go beyond compliance and adopt practices that reflect leadership in risk management.
Why SEG Sampling Is a Best Practice
Similar Exposure Groups (SEGs) cluster workers with comparable potential exposure profiles. By sampling and analyzing these groups, organizations gain:
- Validated controls – Confidence that ventilation, enclosure, and procedural safeguards work as intended.
- Better-informed MOC decisions – Ensuring process or equipment modifications do not create new exposure risks.
- Evidence-based hazard analysis – Data that strengthens PHAs and risk assessments.
- Health-focused investigations – A reliable exposure baseline for incident reviews and lessons learned.
- Employee trust and engagement – Demonstrating leadership’s commitment to both acute and chronic risk protection.
Aligning SEG Sampling with PSM Elements
Industrial Hygiene practices and SEG sampling integrate naturally with PSM and RBPS elements:
- PHA: Chronic health hazards get the same rigorous treatment as acute release scenarios.
- Operating Procedures & Training: SEG data informs safe work practices and targeted training.
- Mechanical Integrity: Confirms engineering safeguards like containment and ventilation systems are effective.
- Incident Investigation: Provides exposure data to support root cause analysis.
- Auditing & Continuous Improvement: Establishes measurable indicators for performance tracking.
Conclusion
A comprehensive Process Safety Management program doesn’t stop at preventing catastrophic events. It also addresses the daily, less-visible risks that can impact worker health over time. Making Industrial Hygiene SEG sampling part of the PSM toolkit is a best practice—one that aligns with OSHA’s intent, advances CCPS’s vision for risk-based safety, and reinforces a company’s leadership in protecting its people and operations.
By treating exposure monitoring as a core element of PSM, organizations can raise the bar from compliance to excellence.
