DIRECT ANSWERReplacing a vessel requires measured site interfaces as well as the old drawing: nozzle coordinates, support elevations, anchor pattern, available removal path, neighboring equipment, isolation and lifting access. Record what could not be measured.
Survey dimensions
- Datum and coordinate system
- Nozzle, flange and anchor dimensions
- Platform, piping and insulation clearances
- Removal, delivery and crane envelope
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
- An old general arrangement is evidence of intended design, not proof of current as-built dimensions.