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A radar selected from a design drawing may reach site after the nozzle has been extended, coated or fitted with an adapter. Radar installation readiness depends on the finished geometry. An earlier drawing approval does not cover an undocumented change that recesses the antenna or narrows its opening.
Inspect after the work that can change the measurement path
Schedule the dimensional check after relevant welding, lining and connection work is complete, but before the installation becomes inaccessible. Record actual bore, length, internal transitions and the final antenna position. Include reducers and spacers rather than quoting only the original nozzle dimensions.
| Construction change | Potential consequence |
|---|---|
| Nozzle extension | A different reference height and a more recessed antenna. |
| Lining or coating | A changed opening or internal surface that was absent from the original review. |
| Adapter | A new lip, bore transition, sealing joint or antenna clearance. |
| Insulation work | Reduced access to the housing, cable entries or components that must remain exposed as specified. |
Use the finished dimensions for radar installation readiness
The METRAVON MV-RD12 has a 32 mm PTFE lens, with threaded and flanged connection choices. Matching a nominal flange size does not confirm the internal radar path. Send the complete section, including the lens position, when construction changes differ from the accepted arrangement.
Check physical fit and measurement suitability separately. A joint may assemble correctly while an internal shoulder creates an unwanted reflection. Conversely, a clear radar path does not establish that the selected joint materials and pressure rating are suitable.
Resolve differences before installing the instrument
If the finished nozzle differs from the approved drawing, document the difference and have the proposed installation change reviewed before fitting the radar. Do not grind, trim or modify an antenna to fit a smaller opening. The responsible engineer should decide whether to revise the connection, select another construction or approve a supported arrangement.
Record the final reference plane for commissioning. Adding an adapter can shift that plane even when the tank itself is unchanged. Reusing an old empty-distance value then creates an error that may later be mistaken for a radar calibration fault.
Protect the unit from remaining site work according to its instructions. Do not treat temporary covers, construction debris or unfinished cable entries as items that commissioning will automatically discover. Identify any remaining work and who is responsible for removing temporary protection before operation.
Q1. Can a photograph replace the final nozzle measurement?
It supports the review but usually cannot establish hidden bore transitions, exact dimensions or reference location. Supply both where those details affect the installation.
Q2. Does a previously accepted drawing need to be reissued?
Use the project's change process to keep the installation record accurate. An approved deviation or revised as-built drawing must make the final arrangement traceable.
Summary
Check the nozzle that was built, not only the nozzle that was designed. Submit the final section and marked construction changes before completing the MV-RD12 mounting.
