Case Study 4: Workers Overcome by Toxic Gas During Reactor Washing

Summary

In April 2001, a tragic incident occurred in a food flavors manufacturing facility where workers were overcome by toxic gases during a reactor washing operation. A supervisor and a technician took unsafe measures to clear a reactor of contaminants, leading to a plant washer's death and injuries to two others. The situation escalated when they failed to recognize the reactor as a confined space, resulting in the accumulation of toxic gases. Inadequate risk assessments and absent safety procedures were major contributors, underscoring the critical need for confined space safety protocols. Lessons learned emphasize the importance of risk assessments, safety training, and the use of proper breathing apparatus to prevent such tragedies.

Highlights

• A tragic incident unfolded in a reactor washing operation due to toxic gas exposure 🚨.
• Workers at a flavor manufacturing facility failed to recognize a reactor as a confined space 🏭.
• Absence of confined space entry procedures led to the accumulation of harmful gases 💨.
• Inadequate safety measures and lack of training were major contributors to the fatalities 📉.
• The aftermath highlighted the urgent need for proper risk assessments and protective gear 🔍.

Key Takeaways

• Always identify and label confined spaces in work areas to enhance safety 🚫.
• Implement strict confined space entry procedures and permits to prevent accidents 📜.
• Conduct regular gas testing and use mechanical ventilation to ensure a safe atmosphere 🌬️.
• Provide safety training and proper equipment to workers entering confined spaces 🛡️.
• Learn from past incidents to improve safety measures and prevent future tragedies ⚠️.

Overview

In a disheartening occurrence within a food flavors manufacturing facility, a reactor washing operation took a tragic turn, resulting in the demise of a plant washer and injuries to others. The critical misstep was failing to recognize the reactor as a confined space, which allowed toxic gases to accumulate. This oversight, combined with inadequate safety protocols, set the stage for disaster.

During the operation, workers attempted to clean the reactor without appropriate confined space entry procedures. This not only led to the buildup of toxic gases but also left the workers unprepared for the hazardous environment. The absence of suitable breathing apparatus and proper risk assessments further amplified the danger.

The aftermath of the incident served as a stark reminder of the perils associated with confined spaces. It underscored the necessity for rigorous safety protocols, such as proper worker training, mandatory use of breathing apparatus, and comprehensive risk assessments. By learning from past mistakes, companies can enhance workplace safety and prevent similar tragedies in the future.

Chapters

• 00:00 - 01:00: Incident Overview In April 2001, a supervisor arrived at a food flavors manufacturing facility's thermal processing room to start a production run. Along with a production technician, the supervisor began operations. After one and a half hours, the supervisor loaded ingredients into the thermal reactor, increasing the temperature to 120 degrees Celsius.
• 01:00 - 02:00: Initial Actions and Reactor Inspection The chapter titled 'Initial Actions and Reactor Inspection' details the procedures followed by a production technician after a reactor's temperature fell to 70 degrees Celsius. The technician first discharged the product from the reactor to the fermenter for storage over a period of 15 minutes. After completing the discharge, the technician opened the cover of the reactor to inspect its interior. During the inspection, he discovered some leftover salt at the reactor's bottom and decided to pump it out.
• 02:00 - 03:00: Reactor Cleaning Process The chapter titled 'Reactor Cleaning Process' describes the procedure for cleaning a reactor. Initially, the content of the fermenter is drained back to the reactor to remove salt residue, a process repeated two to three times. After inspection by the production technician and supervisor, black residue is noticed at the bottom of the reactor. To address this, the supervisor conducts a wash by flushing hot water followed by cold water, yet the black residue persists.
• 03:00 - 04:00: Safety Incident Occurrence The chapter titled 'Safety Incident Occurrence' details an event involving a plant washer who was tasked with cleaning the interior of a reactor to prevent contamination in the next batch of products. Upon arriving in the thermal processing room, the plant washer used a hydro jet gun to spray the interior, but the black residue remained. Attempting to resolve the issue, the plant washer extended his reach into the reactor to manually brush away the residue.
• 04:00 - 05:00: Emergency Response and Rescue The chapter "Emergency Response and Rescue" describes an incident at a plant involving a reactor. A worker named Marks felt a strong smell inside the reactor and withdrew. He was given a paper mask and attempted to enter the reactor again. However, after a brief time, the smell became unbearable, and Marks gestured his inability to withstand it. Suddenly, he slipped and accidentally fell into the reactor. The supervisor witnessed the accident when he looked into the reactor.
• 05:00 - 06:00: Safety Failures and Analysis In the chapter 'Safety Failures and Analysis,' a critical incident is recounted involving a plant washer and a supervisor inside a reactor. The plant washer became unconscious, prompting the supervisor to enter the reactor to rescue him. Despite attempts to revive the washer by slapping him, there was no response. Soon after, the supervisor himself experienced difficulty breathing and attempted to exit the reactor but lost consciousness during his escape. He was eventually rescued by a flavor technician and colleagues. The narrative highlights a concerning lack of awareness about the plant washer's condition and raises questions about safety protocols and response strategies in critical situations.
• 06:00 - 07:00: Lessons Learned and Safety Recommendations The chapter discusses a critical incident involving a reactor washing operation that led to a worker's death. Initially, an unconscious worker was discovered inside the reactor, prompting a rescue attempt. A flavor technician first attempted to rescue the unconscious worker but had to retreat due to breathing difficulties. After obtaining a cartridge respirator, the technician re-entered the reactor and, with the help of colleagues, managed to extract the unconscious worker. Unfortunately, the operation ended tragically with the death of the worker, underscoring the need for enhanced safety measures and protocols.

Case Study 4: Workers Overcome by Toxic Gas During Reactor Washing Transcription

• 00:00 - 00:30 in april 2001 a supervisor arrived at the thermal processing room of a food flavors manufacturing facility and started the production run together with a production technician one and a half hours later the supervisor loaded the ingredients into the thermal reactor he raised the temperature of the reactor to 120 degrees celsius
• 00:30 - 01:00 and maintained it for 15 minutes when the reactor temperature fell to 70 degrees celsius the production technician proceeded to discharge the product from the reactor to the fermenter for storage after 15 minutes of discharging the production technician opened the cover of the reactor to inspect the interior and check for leftover products he saw some leftover salt at the bottom of the reactor and decided to pump the product from the
• 01:00 - 01:30 fermenter back to the reactor again in order to drain away the salt residue this draining process was repeated two to three times the production technician and supervisor inspected the interior again but saw some black residue at the bottom of the reactor the supervisor carried out the first wash from the outside of the reactor by flushing the interior with hot water followed by the second wash with cold water however the black residue remained a
• 01:30 - 02:00 plant washer was called in and instructed to clean the interior of the reactor as the black residue would contaminate the next batch of products when the plant washer arrived at the thermal processing room he carried out the washing immediately he first sprayed the interior of the reactor with water using a hydro jet gun as the residue remained after hydro jetting the plant washer stretched into the reactor to see if he could brush away the black
• 02:00 - 02:30 marks after a while he withdrew from the reactor complaining of a strong smell inside the production technician handed him a paper mask the plant washer wore the paper mask and stretched into the reactor again after a short while he withdrew and sat at the mouth of the reactor gesturing that he could not stand the strong smell suddenly he slipped and fell into the reactor the supervisor looked into the reactor and saw that the plant washer was
• 02:30 - 03:00 unconscious the supervisor then stretched into the reactor to try and rescue the plant washer he slapped him a few times to try and revive him but the plant washer did not respond shortly after the supervisor had difficulty breathing and attempted to withdraw himself from the reactor however he blacked out as he was on his way out the supervisor was subsequently pulled out of the reactor by the flavor technician and his colleagues nobody knew that the plant washer was
• 03:00 - 03:30 still unconscious inside the reactor until the production technician alerted them the flavor technician then stretched into the reactor to rescue him however after a few seconds he withdrew from the reactor because of breathing difficulties and asked for a cartridge respirator after wearing the respirator he stretched into the reactor again and pulled out the plant washer with the help of his colleagues this reactor washing operation resulted in the death of one worker
• 03:30 - 04:00 and injured to others what went wrong reactor not identified as a confined space management failed to recognize that reactor inspection involved head entry into a confined space it was therefore overlooked the confined space entry was a necessary step of the reactor washing operation confined space entry procedures not established
• 04:00 - 04:30 management knew that head entry was often required but did not institute a permit to work system for reactor washing operation presence of toxic gases undetected management failed to identify that hydrogen sulfide and other sulfide compounds could be generated during product manufacture under abnormally high temperature conditions no safe work procedures for non-routine work only a cleaning checklist for routine
• 04:30 - 05:00 work was available workers were not given special instructions on how to remove the residual black marks that remained after hydro jetting lack of training the plant washer was not trained for confined space work and no confined space attendant was appointed to keep watch no proper breathing apparatus a paper face mask was worn by the deceased worker instead of an air purifying respirator
• 05:00 - 05:30 lessons learned risk assessment before starting any work in a confined space always conduct a risk assessment to identify safety and health hazards measures to minimize risks should be implemented before starting work identification of a confined space management should carry out a walkabout together with workplace safety and health professionals
• 05:30 - 06:00 to identify document and label all confined spaces where workers may be required to enter during the course of their work confined space entry permit system it is important to recognize that confined space entry occurs once a person's head passes through the opening of a confined space confined space entry procedures and a permit work system for entry into a confined space should be developed and implemented for
• 06:00 - 06:30 all such situations mechanical ventilation mechanical ventilation should be used to ensure that the atmosphere within the confined space is safe for entry gas testing checks on oxygen levels and presence of flammable and toxic gases should be conducted prior to entry and repeated at regular intervals after entry to confirm that the atmosphere remains safe for continued work safe work procedures for non-routine
• 06:30 - 07:00 work safe work procedures should be developed and implemented for both routine and non-routine work this will ensure the reactor washing operation can be carried out safely without endangering the safety of the workers and others in the vicinity safety training it is important for workers who carry out reactor cleaning to be properly trained and fully aware of on-the-job hazards it is also necessary for them to undergo
• 07:00 - 07:30 training on confined space entry procedures and proper use of personal protective equipment prior to the reactor washing operation suitable breathing apparatus workers must be provided with suitable breathing apparatus before entry into any confined space where toxic gases are present in particular the use of suitable breathing apparatus is very important for workers undertaking rescue operations prior to entry into a hazardous
• 07:30 - 08:00 atmosphere