Process%20Safety

1
Process Safety

• IENG 331 Safety Engineering
• Carter J. Kerk, PhD, PE, CSP, CPE
• Industrial Engineering Program
• South Dakota School of Mines Technology

2
Process Safety Standard, 1992

• 29 CFR 1910.119
• 1 of OSHA General Industry citations address
  this subject
• Motivation
• Union Carbide, Bhopal, India
• Phillips Petrochemical, Pasadena, Texas
• Purpose
• Preventing or minimizing the consequences of
  catastrophic releases of toxic, reactive,
  flammable, or explosive chemicals. These releases
  may result in toxic, fire or explosion hazards.

3
Bhopal Disaster (www.bhopal.com)

• December 3, 1984, Bhopal, India
• 3800 killed, 40 permanently disabled, 2800
  partially disabled
• Union Carbide India Limited plant
• Methyl isocyanate (MIC, used to make pesticide
  and herbicide) gas leaked into atmosphere,
  killing and disabling thousands as they slept
• Cause A large volume of water entered the MIC
  tank, causing a chemical reaction forcing the
  release valve to open and the gas to leak
• Questions remain Was it an accident or
  deliberate?

4
Phillips Petrochemical Disaster

• October 23, 1989, Pasadena, Texas
• 24 killed, 314 injured, 750M facility damage
• Polyethylene (plastic used to make milk
  containers)
• Cause Subcontractor maintenance crews using poor
  lockout practices caused escape of process gas
  (isobutane, ethylene, hexene, hydrogen) which
  traveled to an ignition source and exploded with
  the force of 2.4 tons of TNT and then subsequent
  fire

5
29 CFR 1910.119

• Appendix A
• list of highly hazardous chemical, toxics, and
  reactives
• Appendix B
• block flow diagram and simplified process flow
  diagram
• Appendix C
• compliance guidelines

6
Develop an Information Database

• Compile info on
• highly hazardous chemicals used or produced
• equipment used
• technology of the process
• From MSDS and other sources

7
Process Information Before an analysis of a
process can begin, the employer must compile
information on highly hazardous chemical to be
used or produced, the equipment to be used, and
the technology of the process. Potential sources
of information include the MSDS, chemical
dictionaries and reference manuals, and the NIOSH
Registry of Toxic Effects of Chemical Substances
(http//www.cdc.gov/niosh/rtecs/RTECSaccess.html).
Case Study 6.1 shows how published data can be
used to provide the data necessary for analysis
of hazardous processes. Also provide process
chemistry data, maximum intended inventory, and
safe upper and lower limits for temperatures,
pressures, flows, or compositions.
8
Note CAS Chemical Abstract Service number.
TQ Threshold quantity in pounds (amount
necessary to be covered by this standard).
9
Document the Processes

• Use block flow diagrams and process flow diagrams
• where possible include flow rates, stream
  composition, temperatures, pressures, etc.
• include engineering details
• materials of construction, piping and
  instrumentation diagrams, relief systems,
  ventilation, interlocks, detection and
  suppression systems, etc.

10
(No Transcript)
11
(No Transcript)
12
Is this only for the petrochemical industry??

• No, OSHA defines process more broadly
• poultry processor using chlorine for
  refrigeration
• metal processing industries using plating
  chemicals

13
Process Analysis

• What can go wrong?
• How to react?
• What-If Analyses
• fault-tree analysis (FTA)
• failure modes and effects analysis (FMEA)
• Analyses must be updated every 5 yrs
• Document and record analyses

14
Operating Procedures

• After process info has been gathered and
  analyzed, develop effective operating procedures
• Establish procedures for different modes
• normal operations
• temporary operations
• emergency operations

15
Training Programs

• Initial training for new operators and new
  operations
• Refresher training, lt 3 years
• Verification or testing
• Documentation

16
Contractors

• Contracted labor is a growing trend
• Prime employer is responsible for operations and
  conduct of contract employees
• Examine contractor safety records prior to
  contract
• Maintain injury/illness log on contract employees

17
Acts of Terrorism

• The terrorist attacks September 11, 2001 on the
  World Trade Center and the Pentagon, forever
  changed the challenges for Process Safety
• We now add terrorist attacks to our concerns for
  Disaster Preparedness
• Many safety professionals have now had this
  concern added to their responsibilities

18
Terrorist Disaster Preparedness

• Limit facility access
• Parking lot design and location
• Landscaping changes to protect buildings
• Concrete barricades to limit approaches and
  access
• Incident management aspects
• How to protect workers and volunteers after an
  attack?
• Training on use of equipment and PPE