Table 9 Presentation messages during the attenuation activity
Evaluation items | Presentation messages |
|---|---|
Wind direction | Wind direction |
Type of leak materials | Type of leak materials Is the leaking material a flammable gas or a toxic gas? |
Leak concentration | Leak concentration Is the gas concentration at the leak location close to 100% LEL? Is the gas concentration at the leak location less than the allowable concentration? |
Leak area | Leak area From which location is the gas leak occurring? What area is the gas leaking? What is the distribution of the gas concentration? |
Environmental conditions of the leak area | Surrounding conditions of the leaking area (T) Is there a furnace that can be an ignition source? Are there any equipment that can generate static electricity? |
Type of water discharge | Type of water discharge |
Building entrance | Where are the entrances of the building? Is there an emergency entrance? Is there an opening larger than a circle with a diameter of at least one meter? Are there any openings larger than 0.75 m × 1.2 m? |
Distance and position from the command headquarters | Distance and position from the command headquarters Can the attenuation activity be confirmed from the command center? |
Activities after the concentration reduction | Activities after the concentration reduction Is the location of the department capable of securing a flow line that allows valve closure activities to be conducted? Are the locations of the robots and hoses not in the way of the activities of the following units? Is the position of the department designed to simplify the removal of the robot? |