1. Primary hazard source: high-pressure gas leakage, device or equipment failure leads to pressure loss control, resulting in serious casualties or equipment damage.

2. Secondary hazard source: the risk of accidents caused by abnormal conditions under normal operating conditions.

3. Three-level hazards: risks caused by improper operation procedures, misoperation of operators and failure of equipment safety protection devices.

4, equipment inspection and maintenance is not timely, lack of equipment management, insufficient training of operators, there are hidden dangers of accidents.