150: Workplace Layout Issue
Definition/Typical Issues
Did inadequate controls or displays contribute to the error? Was poor integration of controls and displays a factor? Did differences in equipment between different processes or areas contribute to the problem? Did poor arrangement or placement of equipment contribute to the incident? Was there a failure to appropriately and clearly label all controls, displays, and other equipment?
Examples
Example 1
- In one processing plant, two units performed the same function. Each unit had a separate control room. The control rooms were identical except that they were mirror images of one another. An operator, normally assigned to the first unit, caused a serious process upset when he was assigned to work in the second unit.
Example 2
- The controller for an automatic valve was located on the front side of a vertical panel. The flow indication for the line was on the back side of the panel. A mirror was installed so that the operator could see the flow indication while adjusting the valve position. However, the reversed image in the mirror caused problems in setting the correct valve position.
Typical Recommendations
- Ensure that operators are provided with sufficient information to control the process.
- Locate related controls and indications together.
- Follow expected norms in labeling and arranging of controls and indications (e.g., left-to-right, top-to-bottom progression, consistent color codes).
Cross-References
| Version 10 Element(s) | |
|---|---|
| Node ID | Node Name |
| 140 | Workplace Layout |
| Maritime Element(s) | |
|---|---|
| Node ID | Node Name |
| 165 | Workplace Layout |