PVC plant explosion

 An explosion at a PVC plant few weeks ago in US has been reported.The accident forced area residents and plant workers to shelter in place for several hours. Read and see the video of the fires in this link.

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Using GIS for emergency planning and response

A news item mentions that "The latest version of the web-based Geographic Information System (GIS) emergency planning and response system, developed by the National Informatics Centre (NIC), is all set for operations in factories in Mahbubnagar, Krishna and Nalgonda districts. Introducing the fourth phase of the technology here on Friday, NIC deputy director general Sanjay Singh Gehlot said, “the latest version aims to minimize damages during explosion or chemical accidents in industries.” The first phase the technology was launched some eight years ago".
Read the news item in this link.

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Discharge of bleaching agent causes illness

An incident in Thailand has been reported where many workers were sent to hospital after an abrupt discharge of a bleaching agent. The accident took place about 6.30pm when workers smelled a strong chlorine-like odour at the plant. The article mentions that the odour probably came from sodium hypochlorite, which was discharged from the plant during an emergency shutdown.
Read the article in this link.

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Blast in chemical factory

The Hindustan Times has reported a blast at a chemical factory near Chandigarh that killed 4 personnel.
"Initial reports suggested that the first blast was caused by a "static charge". However, according to sources linked with the probe, a safety valve of the reactor may have malfunctioned'.
Read the article in this link.

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Commissioning new plants - hazards

In a new plant that was being commissioned, Hot Oil, used as a heating medium, leaked from a flange. The leak was on the second floor and the temperature of the medium was about 300 deg C. The leaking hot oil, caused major fires and a section of the new plant was destroyed. Ensure that commissioning is done in a planned way and that checklists are followed.

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Chemical plant cited for safety violations

A chemical plant in the US has been cited for safety violations by OSHA. These violations include insufficient ventilation, an inadequate sprinkler system, inadequate worker training and failure to conduct hazard assessments at the plant.Read the article in this link.

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Hazards in tanks and vessels

WorkSafe , Alberta has published a safety bulletin titled "Controlling explosion hazards in vessels, tanks and piping systems. The following is mentioned:

"Two workers were welding an overflow pipe on top of a tank truck that contained residual flammable materials. Welding sparks ignited the materials, the tank exploded and the workers were killed. The explosive atmosphere in the tank had not been tested prior to the workers beginning their work. The tank previously contained produced water.

A vessel was purged with natural gas to remove hydrogen sulphide. The vessel was opened and a worker was washing the inside of the vessel with a water wand. A pyrophoric iron reaction on the demister pad started to release sparks inside the vessel. An explosion occurred and the worker was fatally injured.

Iron sulphide is a pyrophoric material. This means that it can spontaneously ignite when exposed to air. It is created when iron oxide (rust) is converted into iron sulphide in an oxygen-free atmosphere where hydrogen sulphide gas is present or where the concentration of hydrogen sulphide (H2S) exceeds that of oxygen.
When iron sulphide is subsequently exposed to air, it is oxidized back to iron oxide and either sulfur or sulfur dioxide gas is formed. This chemical reaction between iron sulphide and oxygen generates a considerable amount of heat. In fact, so much heat is released that individual particles of iron sulphide become incandescent and glow. This heat can ignite nearby flammable mixtures.
Most refineries experience spontaneous ignition of iron sulphide either on the ground or inside equipment. Pyrophoric iron fires most commonly occur during shutdowns when equipment and piping are opened for inspection or maintenance. Iron sulphide fires can be avoided by preventing the sulphide from contacting air. This can be achieved by maintaining a continuous layer of liquid or inert gas between the material and the air. Inerting vessels with nitrogen gas is one such method.

A vessel containing hydrogen sulphide was purged with propane. The workers then opened the vessel for clean-out. When the manway was opened, an explosion occurred resulting in the four workers receiving burns to their faces and hands. The possible source of ignition that caused the explosion was static discharge or metal-to-metal contact"
Read the Workplace health and safety bulletin in this link


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Enforcement of safety rules

An article in the Hindu newspaper reflects the lack of enforcement of fire safety rules in hospitals and other buildings. Chemical plant zoning rules are another area where the rules need to be strictly implemented to avoid the consequences of a catastrophic incident. Unfortunately there is still more to improve in this area. Let us not wait for another Bhopal type incident to wake up to the reality.
Read the article in the Hindu in this link.
  
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Explosion in glue factory in Japan

An explosion has been reported in a glue factory of Mitsui Chemicals in Japan. Read the article and see the photo of the explosion in this link.

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Lessons to learn from Hot work accident at DuPont

The CSB has published its report on the investigation of a hot work accident at a DuPont facility in the US.

Two contractors were performing welding atop a 10,000 gallon slurry tank when hot sparks ignited flammable vapors inside the tank, causing an explosion that killed one contractor and seriously injured another.
One of the root causes of the incident was failure to test the internal atmosphere of the tank prior to hot work outside the tank. DuPont is renowned for their safety practices and if can happen in DuPont, it can happen anywhere else.

While I am not commenting on the incident and its findings, I strongly feel that competency to understand process safety issues is dwindling in India. When I started my consultancy 10 years ago on process safety, I often got calls for a "safety audit". I had to explain that process safety is different from the regular occupational health and safety. What I see today is the alarming lack of process safety competency in leadership in many Indian Chemical Companies. You may have excellent process safety systems but the bottom line is that unless you have competent personnel to understand and use these systems, they cannot protect you.

Read the CSB report and watch the excellent video in this link.

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More confined space accidents

 NIOSH had published in 1986 case studies of confined space accidents. They observe that 60% of fatalities in confined space accidents are would be rescuers. Some of the accidents mentions are:

"A 54-year-old worker died inside a floating cover of a sewage digester while attempting to restart a propane heater that was being used to warm the outside of the sewage digester cover prior to painting it Workers had wired the safety valve open so that the flow of propane would be constant, even if the flame went out. The heater was located near an opening in the cover of the digester. When the worker attempted to restart the heater, an explosion occurred that vented through the opening. The worker crawled away from the heater into an area that was oxygen deficient and died. A co-worker attempted a rescue and also died". 
"A 20-year-old construction worker died while attempting to refuel a gasoline engine powered pump used to remove waste water from a 66 inch diameter sewer line that was under construction. The pump was approximately 3,000 feet from where the worker had entered the line. The worker was overcome by carbon monoxide. A co-worker, who had also entered the sewer line, escaped. A 28-year-old state inspector entered from another point along the sewer line and died in a rescue attempt. Both deaths were due to carbon monoxide intoxication. In addition to the fatalities, 30 firefighters and 8 construction workers were treated for carbon monoxide exposure".

Read the case studies of confined space accidents in this link

 
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Blast in German chemical plant

Thanks to Balu for sending information of an accident in a German chemical plant has reportedly killed two people. The plant was manufacturing  cyclododecatriene, an intermediate used to make nylon 12, flame retardants, flavors, and fragrances.The blast was apparently triggered in a tank in the cyclododecatriene plant.The cause of the blast is being investigated.
Read about the accident in this link.
 See blast pictures in this link

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