Health and Safety Hazards (Essay Sample)
Unit VII Case Study
Read the incident scenario, and write a response that is at least three pages in length. Your response must include answers to the questions being asked. All sources used, including the textbook, must be referenced. Paraphrased and/or quoted materials must have accompanying in-text and reference citations in APA format.
You are the Refinery Emergency Response Coordinator for an incident at the SJV Refinery which has been in operation since 1966. The refinery processes 120,000 bbls of crude oil per day, which has a sulfur content of 2.5 percent. The refinery converts crude oil to naptha, light oil, and heavy oils using the Atmospheric/Vacuum Distillation Unit with key equipment such as the following:
• naptha, kerosene, gasoline, and diesel hydrotreaters;
• isomerization unit;
• naptha reformer;
• fluid catalytic cracker;
• polymerization unit (petrochemical section of the refinery polymerizing olefin gases to produce polyethylene);
• sulfur recovery Claus plant (catalytic reactors); and
• distillate/gasoline blending tanks.
The refinery was initiating work on a major plant turnaround at the time of the incident to complete required maintenance repairs, mechanical integrity inspections, and modifications to existing equipment. Twenty contractor companies (approximately 150 employees) have been contracted to perform this work under the direction of refinery staff. All of the contractor workers completed the refinery orientation training.
Work for the contractor crews is assigned/scheduled each morning. On the day of the incident, the day-shift (6 am to 6 pm) crew had been tasked with isolating the acid gas feed stream for the Claus unit. Due to other work priorities, the crew did not isolate the line as planned. A shift turnover for the night contractor crew did not happen due to mandatory safety training that delayed their arrival at the worksite. Upon their arrival at the work site, the night crew held a job safety analysis (JSA) review of the scheduled task (line breaking of the acid gas feed line to replace a segment) to be performed and the hazards present. No pressure gauges or monitoring was present to indicate that the acid gas feed line was operational. The crew initiated the line breaking activity (open the line to the atmosphere) at approximately 7:45 pm under self-contained breathing apparatus (SCBA), which almost immediately resulted in the uncontrolled release of acid gas. A nearby ignition source from a welding operation ignited the flammable gas. The following actions were initially taken:
• The evacuation alarm was sounded and the refinery emergency response team (ERT) was activated.
• The plant manager and the local fire department were notified of the incident.
• The incident command was established at the refinery office near the main refinery access gate to the south (this is the furthest distance within the refinery boundary from the incident location).
• The refinery ERT incident commander implemented actions required under the approved refinery emergency response plan.
• The ERT was not able to immediately isolate the acid gas feed pipeline.
• The fire department arrived on location and assumed the incident command of the event.
Additional Relevant Information:
• The refinery encompasses an area measuring 2000 feet by 1400 feet. The Claus unit is located in the most northern part of the refinery, approximately 1350 feet from the main refinery access gate to the south. The polymerization unit is operating directly adjacent to the Claus unit.
BOS 3640, Interactions of Hazardous Materials 4
• The nearest residential community is located approximately 1000 feet to the northeast of the refinery.
• A plastic recycling plant is located along the south fence boundary of the refinery.
• A major interstate highway runs directly parallel to the plant, approximately 1/4 of a mile directly north of the refinery.
• The ambient temperature on the day of the incident was 85° F and the wind was blowing at 7 mph from the southwest to the northeast.
• Work crews were scheduled to work 12-hour shifts, 24-hours a day, to complete the refinery turnaround.
• Due to the age of the refinery, SJV has implemented a robust mechanical integrity program.
• The refinery has a trained ERT that can respond to incidents.
• Fixed water monitors are present throughout the refinery to extinguish refinery equipment fires. The refinery ERT does not fight fires past the incipient stage.
• The refinery has received notices of violation (NOVs) from the local air district in the past several years due to gas and liquid leaks from piping components, such as valves, compressor/pump seals, and for excess sodium dioxide (SO2) emissions related with their sulfur plant.
• Due to historical discharges of organic compounds, groundwater monitoring wells are present down gradient of the facility. Groundwater underlying the plant has historically been encountered at 30 feet below ground surface.
Hydrogen sulfide is present in the acid gas feed to the Claus plant. The H2S concentration of the acid gas feed is approximately 70 percent by volume. H2S and sulfur dioxide (SO2) have the following physical
Physical Property H2S SO2
Specific Gravity at 68oF (20oC) 1.54 1.4
Vapor Density (Air=1) 1.18 2.22
Flashpoint -116oF (-82.4oC) Not Applicable
Autoignition Point 500oF (260oC) Not Applicable
Lower Explosive Limit 4.3% Not Applicable
Upper Explosive Limit 46% Not Applicable
IDLH 100 ppm 100 ppm
1. Discuss the hazards posed by the interaction of the hazardous materials present at the refinery and adjacent facilities, including the resulting by-products of the incident fire and acid gas release.
2. As the lead refinery representative on the unified incident command (UIC), what actions should be taken by the UIC to respond to this incident (please consider all receptors).
3. If the polymerization unit is engulfed in the fire, how will this affect your response?
4. All emergency responders participated in the post-incident critique. What corrective actions should be implemented by the refinery to prevent the reoccurrence of this incident?
Health and Safety
Health and safety
Refineries are complex processing plants that are under the constant threat of developing emergencies relative to the machinery and the chemical compounds being processed; more importantly the volatility levels of the compounds. Relative to the hazardous material that the staffs deal with on a daily basis and the risks associated with every single process at the plant, there is a requirement for emergency responses (Green, 2015). All the staffs should undergo mandatory training relative to handling emergencies. One of the recent cases was at the Chevron plant in 2012, where the crude unit fire, from atmospheric distillation column after hot diesel material leaked, catching fire (Cchealth.org, 2015). In the case study, at the SJV Refinery, there is a hazardous gas leak from the Claus unit and it contains hydrogen sulfide at 70% of the volume.
Hazards related to the leak at the refinery are quite many and are closely associated with hydrogen sulfide that fact that there was a fire in one of the most dangerous sections of the refinery (Osha.gov, 2015a). There are quite a number of hazards associated with hydrogen sulfide and most of them are on the health elements of the staffs at the refinery at the time of the leak (Osha.gov, 2015a). Considering that the concentration of the hydrogen sulfide gas in the gas leak was 70% by volume, this is highly dangerous and easily become fatal to those that come in contact with the leak (Stellman & International Labour Office, 1998). The main means of exposure to the staffs would have been through inhalation. Health wise, the gas is quite lethal and in most cases, exposed staffs will start to show signs of headaches, poor attention, memory loss, becoming unconscious and motor functions may be compromised after coming to (Osha.gov, 2015a). In some cases cardiovascular complications will be associated with concentration and prolonged exposure some of which can be lethal (Green, 2015) l. Hydrogen sulfide is characteristically highly flammable and explosive when exposed to a source of fire. This means that, the staffs at the refinery at the time of the leak were highly exposed to explosive fires (Stellman & International Labour Office, 1998). Other than the fires, the gas burns to produce toxic gases such as sulfur dioxide. High concentration of hydrogen sulfide in the...
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