A CSE FACTSHEET
This is based on information received and assessment done till 3.30 PM on May 7, 2020. We will continue to update as we get more information
Styrene gas leaked at 2.30 AM on May 7, 2020 from a Vizag (in the state of Andhra Pradesh in India)-based factory called LG Polymers India Pvt Ltd. Eleven people are reported dead after inhaling the gas.
What is styrene? How toxic is it?
Styrene is an organic compound used in the manufacture of polymers/plastic/resins. It is manufactured in petrochemical refineries. It is a likely carcinogenic substance. It can react with oxygen in the air to mutate into styrene dioxide which is more lethal. According to India’s Manufacture, Storage and Import of Hazardous Chemical Rules 1989, styrene is classified as a ‘hazardous and toxic chemical’.
Acute (short-term) exposure to styrene in humans results in mucous membrane and eye irritation and gastrointestinal effects. Chronic (long-term) exposure results in impacts on the central nervous system (CNS), leading to headaches, fatigue, weakness, depression, CSN dysfunction, hearing loss, and peripheral neuropathy. If the amount of styrene goes beyond 800 ppm, then the person exposed to it can go into a coma.
The duration of the exposure and its relative concentration will determine toxicity – we currently know that roughly 3 tonnes of the gas leaked from its storage tank and the feeding line. We now need to determine exposure.
How did the disaster happen?
Styrene monomer was being used at the manufacturing plant to produce expandable plastics. The storage requirement of styrene monomer says that it should be stored strictly at a temperature below 17oC. There was a temporary partial shutdown of the plant owing to the COVID pandemic, excluding maintenance activities in the plant, which were being carried out as per a pre-determined schedule. The problem began as a result of styrene gas not being stored at the appropriate temperature. This caused pressure to build up in the storage chamber and led the valve to break, resulting in the gas leakage.
Also, the container that was being used to store styrene gas was old and not properly maintained. This non-maintenance of the facility resulted in the leakage of 3 tonnes of styrene into the surrounding areas.
Another issue was the defunct VOC detection system at the plant; there is no monitoring mechanism that was installed to specifically detect styrene. The facility is spread over 600 acres of land including the nearby residential areas (according to terms of reference submitted by the company in 2018, it is spread over 231 acres). The impact zone has been in the range of 2-3 km. There is a revenue village nearby and the facility is surrounded by residential areas, resulting in a higher rate of exposure.
The most important immediate treatment is to give oxygen to the affected people. The people in the zone also need to be evacuated as long-term exposure can be detrimental to their health.
In 2018, the factory had submitted a Rs 168 crore proposal to the Union Ministry of Environment, Forest and Climate Change to expand its production capacity by another 250 tonnes per day (tpd) -- from the current 415 tpd. This permission, as we understand it, has been recently granted.
Post-Bhopal disaster, there are clear guidelines on storage of hazardous chemicals in plants -- what are these?
After the Bhopal disaster, many legislations were enacted beginning with the Environment (Protection) Act, 1986 to the Public Liability Insurance Act, 1991. According to The Manufacture, Storage and Import of Hazardous Chemical Rules, 1989, styrene is classified as a ‘hazardous and toxic chemical’.
Did the company not follow the stipulated rules for storage and handling of hazardous chemicals?
There are clear rules on hazardous chemical storage under the EPA, 1986. The unit in question is an ISO-certified facility, which means it has a protocol for everything.
However, what seems to be the case is that the plant management, in its haste to re-start the plant, ignored the protocol of doing maintenance of the plant before resuming operations. This, combined with the lack of proper storage of the gas – not maintained at the temperature required – and faulty fixtures could have resulted in the accident.
The lesson for COVID times -- Vizag could be just a tip of the iceberg
This shows us that there are ticking bombs out there as the lockdown ends and industries start resuming activities. Therefore, an immediate directive must go to all units to ensure safety while resuming operations -- in case the lockdown continues, these safety precautions must not be negated.
You can access the Down To Earth coverage on this tragedy at www.downtoearth.org.in