DIRECT ANSWERA retrofit difference register compares existing as-built conditions with the proposed vessel at each nozzle, support, access, instrument, utility and lifting interface. Record the measurement source, tolerance, responsible discipline and disposition.
Difference-register columns
- Existing measured value and evidence
- New design value and allowable tolerance
- Gap impact on piping, civil or controls
- Owner, resolution and approval status
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 replacement drawing alone cannot prove a site interface matches the plant as found.