Comprehensive Study Guide on Process Safety Management and Fire Dynamics safety 3360 week 1 Thursday

Atmospheric Pressure and Liquid Behavior

• Numerical Conversions and Standards:

  • $14.7\,psi$ is the equivalent of $1\,atm$ (one atmosphere).

  • One atmosphere is also represented as a specific measurement in millimeters of mercury ($mm\,Hg$). A value mentioned in this context is $760\,mm\,Hg$ (or numerically recorded as approximately $160.12753$ in some specific datasets).

  • One atmosphere is a critical standard pressure used in the study of liquids and physics.

• Importance of Reference Points:

  • One atmosphere serves as the standard pressure for characterizing the behavior of liquids.

  • Scientific standards provide a reference point that allows for confidence and consistency in experimental and practical results across the global scientific community.

Hazard Response and Facility Integrity

• Response to Chemical Exposure (Hexavalent Chromium):

  • In the event of skin contact with hexavalent chromium, the affected area must be washed immediately with plenty of water for at least $15\,minutes$.

  • If skin irritation persists after the initial wash, a doctor must be contacted immediately.

• Safety Shower Maintenance:

  • Safety showers and eyewash stations must be inspected and tested monthly.

  • Failure to perform monthly checks can lead to the accumulation of rust. If a shower is left stagnant for long periods, such as $16\,months$, the water may become a "brown nasty rust water" that can injure a person's eyes or face during an emergency.

  • The presence of a heavy layer of dust (e.g., a quarter inch of dust) on an eyewash station is a significant indicator of poor thoroughness and neglect regarding safety protocols within a facility.

Process Safety Management (PSM) and Regulatory Standards

• Defining the 14 Elements of PSM:

  • Process Safety Management (PSM) consists of 14 specific categories or elements designed to manage highly hazardous chemicals.

  • The regulatory source for these elements is OSHA standard $1910.119$.

  • The 14 elements include:

    • Employee Participation (or Employee Involvement).

    • Process Safety Information (PSI).

    • Process Hazard Analysis (PHA).

    • Mechanical Integrity.

    • The remaining elements are listed sequentially up to element 14.

• Mandatory vs. Non-mandatory Standards:

  • OSHA $1910.119$ Appendix C summarizes the 14 elements but is technically labeled as non-mandatory in terms of its specific text.

  • To cite the 14 elements from a mandatory regulatory perspective, one must refer specifically to the requirements within the body of the regulation (e.g., $1910.119(c)$ for employee participation).

  • Citing a non-mandatory appendix as legal justification for a mandatory requirement can damage a professional's credibility.

• Professional Credibility:

  • Professionals must trust and verify their sources to provide confident and accurate answers to supervisors and regulatory bodies.

  • Relying solely on AI (like ChatGPT, Copilot, or Gemini) is dangerous because it can impede the ability to independently verify information and may lead to a lack of confidence in professional judgment.

Chemical Hazards and Identification

• Analyzing Specific Chemicals:

  • When dealing with unknown chemicals like Cyanogen and Ammonium Hypochlorite, safety professionals must consult established resources rather than relying on memory.

  • Cyanogen: An inhalation hazard.

  • Ammonium Hypochlorite: An inhalation hazard characterized by symptoms such as shortness of breath, irritation, nausea, and headache.

• Resources for Hazard Identification:

  • NIOSH Pocket Guide: Produced by the National Institute for Occupational Safety and Health (NIOSH), a professional research organization dedicated to identifying and disseminating safety information.

  • Safety Data Sheets (SDS):

    • Section 4: Contains First Aid measures.

    • Section 10: Contains stability, reactivity, and information regarding incompatible materials (e.g., keeping Ammonium Chloride away from strong acids, strong bases, and strong oxidizing agents).

• Historical Safety Incident:

  • At West Virginia Wesleyan in Christopher Hall (the science hall), a bomb squad was once called to remove a chemical that had crystallized in storage over a long period.

  • In its crystallized form, the substance became highly reactive and was at risk of exploding if exposed to sunlight.

Fundamental Safety and Toxicology Principles

• The Principles of Paracelsus:

  • Paracelsus is known as the "Father of Poisons."

  • His central tenet is that "The dose makes the poison."

  • All substances are inherently poisonous; the toxic effect is purely a matter of the dosage.

• Water Intoxication:

  • Overhydration, or water intoxication, occurs when the body ingests too much water, causing a dilution of the blood and a dangerous decrease in electrolyte levels, particularly sodium.

  • Excess water can also increase pressure on the brain.

  • Headaches can be a byproduct of both dehydration and overhydration.

• The pH Scale:

  • The pH scale ranges from $1$ to $14$.

  • Acids represent the lower end of the scale ($1$ to more than $7$).

  • Bases (alkalinity) represent the higher end ($7$ to $14$).

  • Pure water is generally a neutral $7$ (though some interpretations vary slightly higher).

  • Acids and bases should generally be stored separately to avoid hazardous reactions.

Fire Dynamics and Flammable Limits

• Flammable Limits Definitions:

  • Lower Flammable Limit (LFL) / Lower Explosive Limit (LEL): The lowest concentration of gas or vapor, expressed as a percentage volume in the air, that will burn or explode in the presence of an ignition source.

  • Upper Flammable Limit (UFL) / Upper Explosive Limit (UEL): The highest concentration of gas or vapor by percentage volume in the air that can support combustion or an explosion.

• Concentration vs. Temperature:

  • LFL/LEL deals with the concentration of the substance in the air.

  • Flash Point deals with the temperature required for a substance to give off enough vapor to create an ignitable mixture.

• Atmospheric Oxygen Levels:

  • Safe oxygen levels for humans are generally between $19.5\%$ and $23.5\%$.

  • Insufficient oxygen prevents fire; excessive oxygen can lead to highly dangerous and accelerated combustion.

Heat Transfer and Combustion

• Three Modes of Heat Transfer:

  1. Conduction: The transfer of heat through a solid object (e.g., heat traveling through a metal wire or a wall).

  2. Convection: The transfer of heat through fluids, which includes both liquids and gases (air). Heat causes fluid density to decrease, causing the hot fluid to rise (e.g., boiling water or hot air rising from a fire).

  3. Radiation: The transfer of heat via waves in every direction from a central heat source.

• Combustion Indicators and Smoke:

  • The color of smoke is indicative of the completeness of combustion.

  • Black Smoke: Indicates incomplete combustion and the presence of material that has not been fully burned.

  • Light/White Smoke: Indicates more complete combustion.

  • Fumes vs. Vapors: "Fumes" are specifically particulate matter produced by burning metals. "Vapors" refer to the gas phase of substances that are normally liquids or solids at room temperature.

• Pyrolysis:

  • Derived from "Pyro" (fire) and "Lysis" (separation).

  • Pyrolysis is the chemical decomposition or separation of a substance due to heat in the absence of sufficient oxygen.

  • If oxygen is introduced to a substance undergoing pyrolysis, it will transition into flaming combustion.

  • Liquids always produce a flame when catching fire, whereas solids can undergo smoldering or pyrolysis.

Questions & Discussion

• Q: Is one atmosphere important to liquids?

  • A: Yes, it is the standard reference point for observing the behavior of liquids, ensuring confidence in scientific measurement.

• Q: What do we do if someone spills hexavalent chromium on their arm?

  • A: Wash it off immediately with water for at least 15 minutes and call a doctor if irritation persists.

• Q: What happens if you don't check a safety shower for 16 months?

  • A: You will likely get a face full of brown, rusty water when you finally need to use it.

• Q: What are the 14 elements of PSM?

  • A: They are listed in OSHA 1910.119, including employee involvement, PSI, and PHA. Appendix C lists them but is non-mandatory.

• Q: What is the difference between LFL and flash point?

  • A: LFL is about the concentration of gas in the air; flash point is about the temperature of the substance.

• Q: What is the specific terminology for gas-phase metals?

  • A: Fumes are for metals, and vapors are for gases.