Table 6 Cluster analysis of workshop-level accidents

0

Traffic accident, fire accident, mechanical injury accident, fall down accident, scald accident

Carelessness, vehicle, collision, fracture, fire, smoke, short circuit, crush injury, overhaul, violation, non-standard, maintenance, disassembly, cleaning, safety rope, slip, fall, high temperature, scald

Weak safety awareness, failure to take protective measures, non-standard operation, untimely communication, untimely equipment maintenance, circuit short circuit, and pipeline leakage

1

Production accident

Induced draft fan, electric motor, circuit board, bearing, switch, damage, fault, temperature, over high, burn out, trip, stop

Equipment failure, induced damage to draft fan parts, electric motor damage, over-temperature, switch trip

2

Production accident

Low temperature, high temperature, Economizer, boiler, pipeline, water wall leakage, rupture, leakage point, water level, rise, furnace, pressure, rise, boiler shutdown, maintenance

Economizer leak, pipe rupture, water wall rupture

3

Production accident, environmental pollution accident

Compressor, coke oven gas, flow, pressure, liquid level, too low, rise, fluctuation, interlocking, overrun, trip, shutdown, flare, black smoke, alarm

Significant fluctuation of gas flow/ liquid level/ pressure/ temperature, excessive vibration amplitude, damage to compressor components, pipe blockage, and flange leakage

4

Production accident

Angle valve, pulverized coal, gasifier, quench chamber, sundries, trip, shutdown

Untimely removal of sundries, malfunction, and excessive fluctuation of process parameters