DIRECT ANSWEREllipsoidal, torispherical, hemispherical and flat closures impose different geometry, forming, thickness, weld and cost consequences. The authorized mechanical design selects a head from pressure and temperature cases, diameter, material, external loads, space and applicable rules.
Head-selection inputs
- Design pressure, vacuum and temperature
- Diameter, tangent length and available height
- Material, forming limits and minimum finished thickness
- Nozzles, supports, inspection access and joint detail
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
- A cheaper stock head is not interchangeable with the specified geometry without design review.