DIRECT ANSWERDesign pressure derives from all operating, start-up, shutdown, blocked-in, relief and credible upset cases plus static head and control philosophy under the authorized process design.
Pressure design inputs
- Normal/minimum/maximum operating pressure
- Relief set basis and blocked-in/upset cases
- Static head, vacuum and external pressure
- System interfaces and responsible process authority
Relevant manufacturing capability
- Drawing, datasheet and equipment-list manufacturability review
- Self-manufactured and coordinated-supply scope identification
- Technical, quality, document and delivery clarification
Key notes
- The fabricator should not invent design pressure from operating pressure alone.