Safety Info Posts

Ammonia (concentration 20% or greater) and Ammonia (anhydrous) Alternative Release Scenarios (EPA FAQ)

Pursuant to the Risk Management Program regulations, the owner or operator shall identify and analyze at least one (1) alternative release scenario for each regulated toxic substance held in a Program 2 or Program 3 process above its threshold (40 CFR §68.28). If a facility has both ammonia and ammonia (anhydrous) on site above their […]

NFPA’s Tentative Interim Amendment (TIA) 27-1 – 2027 Edition of NFPA 30

Tentative Interim Amendment (TIA) 27-1 refers to a significant update to the 2027 Edition of NFPA 30: Flammable and Combustible Liquids Code. Issued on April 15, 2026, with an effective date of May 5, 2026, this TIA (Log #1886) was processed by the Technical Committee on Flammable and Combustible Liquids to address safety gaps regarding

What is a Hierarchy of Hazard Control Analysis (HCA)?

Under Cal/OSHA’s Process Safety Management (PSM) standards (specifically Title 8 §5189.1 for refineries and §5110.16 for other facilities), the Hierarchy of Hazard Control Analysis (HCA) is a formal, documented requirement that goes significantly beyond the traditional OSHA “inverted pyramid.” While standard safety protocols often treat the hierarchy as a suggestion, Cal/OSHA makes it a mandatory

The history of H2S’s IDLH Limit

The Evolution of the Hydrogen Sulfide IDLH: From Lethality to Escape Impairment The history of the Immediately Dangerous to Life or Health (IDLH) value for Hydrogen Sulfide (H2S) reflects a critical evolution in industrial safety. It highlights a shift from focusing purely on survival to understanding the physiological “tipping points” that prevent a worker from

The history of NH3’s IDLH Limits

The history of ammonia’s Immediately Dangerous to Life or Health (IDLH) levels is a classic example of how occupational safety standards evolve as toxicological data becomes more refined. Since the concept was first introduced in the 1970s, the ammonia limit has undergone significant downward revisions based on a better understanding of acute human tolerance.

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