Wrong chemical mixing - gas leak - 11 injured

In an incident, the truck driver connected connected a wrong hose pumping acid into a tanker already containing some caustic solution. This resulted in chemical reaction, raising the temperature to 120 deg C and the driver saw yellow gas leak. 11 persons were injured in the incident. It is not clear who cleared the tanker driver to connect a wrong hose.

Following procedures/precautions can avoid such chemcial accidents/incidents.

1. Ensure the fitness of the vehicles by checking for valid certificates before permitting the vehicle into premises.
2. Ensure the contents and volume in the tanker by checking the records from the driver.
3. Ensure the availability of TREM card for the chemical in the tanker.
4. Ensure supervision for the job.
5. Label the hoses with chemical names apart from proper colour coding of the hoses.
6. Ensure connecting of earthing lines (depending on the chemicals handled) to the tanker.
7. Ensure connecting of correct hose to the tanker.
8. Instruct the operator to pump required volume by proper setting.
9. After pumping, disconnect and wait for backflow of chemicals from hoses, if any and wash the area.
10. Disconnect the earthing connections from the tanker.
11. Enter the volume pumped  or the level in the tank after pumping, in the records of the truck driver.

http://www.kval.com/news/local/At-least-three-people-injured-during-hazardous-materials-incident-Portland-155757555.html

A video is also available in the above link about the incident.