Each HAZOP deviation is analysed identifying the potential Causes, including:
- Malfunction of process control systems;
- Blockages;
- Operational Error (e.g. opening wrong valve, failure to respond to signals, etc.);
- Faulty maintenance activities;
- Failure of utilities (power supply, control system, or other utilities).
Further guidelines in relation to causes are:
- Equipment is assumed to be designed to appropriate earthquake, wind, and storm and other environmental requirements, therefore these are not treated as Causes
- Manual valves marked as LO/LC/CSO/CSC will not be considered to change their position by operator error as a cause
Category:
HAZOP