May 24, 2018

Batch Reactor incidents

  1. During trial batch on plant & completion of solvent & acid addition, heating was started. After 15 min. pressure increase observed on reactor. Solvent vapours came out through flange joints of reactor and resulted in explosion due to electrical spark resulting in three fatalities. Root Causes: Non-flameproof electrical installations an Hazard identification & Risk assessment & control was inadequate. 
  2. Reactor pressurised due to exothermic reaction containing oleum & solvent. The mixture came out from reactor manhole.Two workers working below the reactor were injured due to splashing of acid & during treatment they died. Root Causes: High rate of oleum addition due to failure of orifice. Hazard and operability (HAZOP) study and interlocks were not appropriate. 
  3. In a batch reactor, chlorination was started at 9.00 p.m. Approximately 300 Kgs chlorine was passed. Reactor was containing intermediate chemicals. At about 10.30 p.m, release of toxic gas from scrubber vent was observed. Employees of near by industries were affected by inhalation. Root Causes: Failure of scrubbing system, Leak detectors & alarms were not in operation. 
  4. During addition of solvent in agrochemicals intermediate kettle, toxic & poisonous gas started releasing from flange joints. Shop floor workers affected due to inhalation of poisonous gas. Two fatalities & three injured. Root Causes: Hazard not identified & risk was not evaluated before starting the batch. Improper MOC of gasket, No proper scrubbing system.

Courtesy: A.G.Shingore, National Safety Council

No comments:

Post a Comment