The objective of HFE-VCA it to specify requirement to apply HFE principles in the design and layout of valves that includes the following:
- Analyze and then classify the criticality of valves for a specific application.
- Guidance on selection of the appropriate type of valve operator/actuator;
- HFE design requirements for the location and orientation of manual valves.
HFE is the process of integrating human capabilities, limitations, requirements and expectations in the design of products, workplaces or work systems (plant/facility) resulting in the effective, efficient, safe and healthy functioning of human beings. The aim is to improve the efficiency of operational and maintenance task performance, to protect operators from short or long-term health impairments, and to minimize the likelihood of human error contributing to process safety or loss of production.
Valves are rated by criticality to help ensure that critical valves are located to provide for rapid and effective identification and operation. The following three categories are recommended. Risks to health and safety, including risk of human error, shall be kept ALARP.
- Category-1 (C-1) Critical Valves
- Category-2 (C-2) Non-Critical Valves
- Category-3 (C-3) Non-operational Valves