Grinding disc cuts deep

摘要

The vessel was en route to a European port. Deck maintenance was in progress, including repairs to a stand located at the cargo hold hatch covers. During the cutting of a steel bar using a portable grinder, the cutting disc broke into pieces. Part of the cutting disc (or possibly the steel bar) hit a crew member near his right knee area. The wound was about S cm long and 2 cm deep and pieces of loose bone (or cartilage) were observed in the wound. First aid was given immediately and medical advice was requested via radio. Treatment was advised and it was decided to evacuate the victim by helicopter to a shore hospital. Some of the findings of the company report were as follows: 1. A grinding disc had been used instead of a cutting disc. 2. The grinder did not appear to have its protective cover attached. 3. Grinding wheels are subject to deterioration if stored in damp or humid conditions. The effects are a reduction in bond strength caused by the ingress of moisture; this affects the balance and causes surface growth, which reduces the bursting speed. 4. Grinding and cutting discs should be discarded after three years storage as deterioration may render the disc unsatisfactory.