While transferring sulphuric acid using compressed air, the driver cum deliveryman connected a hose to a pipe connected to a tank containing sodium hypochlorite. After the transfer of 15 litres of acid, a site employee, supervising the experienced driver delivering in the plant for the first time, heard an explosion and closed the compressed air valve immediately. The vent of the tank was ripped off. The chlorine released in the workshop poisoned the driver and 28 other employees (one case of serious intoxication) who were hospitalised. The accident occurred due to the presence of four similar pipes, transfer mode (air pressure –> inertia, etc.) and poor risk﷓awareness training of the driver cum delivery man. The delivery of products to the site was re-examined.