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A nominal flange size does not describe the opening that a radar actually looks through. A reducer, misplaced gasket or internal weld can narrow the path after fabrication. Tank radar nozzle inspection should therefore use the finished assembly rather than the design label alone.
Compare the drawing with what was built
During authorised access with the vessel safely isolated, inspect the internal bore and length, including adapters and any valve. Record changes in diameter and projecting features. Use photographs referenced to the connection orientation so the supplier can identify where each restriction sits.
Do not grind a weld, modify a nozzle or alter a gasket to improve the echo without an approved mechanical assessment. The connection is part of the vessel arrangement, and a measurement problem does not authorise changing its structural or sealing function.
Tank radar nozzle inspection checklist
| Feature | What to compare |
|---|---|
| Clear bore | Actual internal dimensions through the whole path, not only flange designation. |
| Internal steps | Reducers, weld profiles and valve components that interrupt the aperture. |
| Seal position | Correct gasket and assembly without unapproved projection into the opening. |
| Antenna position | Final lens location relative to the nozzle end and measurement reference. |
The METRAVON MV-RD12 uses a 32 mm PTFE lens and is offered with threaded or flanged connections. Neither the lens diameter nor the available connection sizes define a universal acceptable nozzle length. Submit the actual dimensions for the chosen construction.
Retest when an intervening part changes
Adding a maintenance valve or adapter can change the distance origin and nearby reflections. Update the mounting record and assess the echo and operating range again. A previously accepted bare nozzle does not automatically approve the modified assembly.
After installation, compare the reported distance at a known stable level. Where diagnostics are available, keep a baseline tied to the final mechanical arrangement. Do not create a suppression map solely from an earlier arrangement with different parts.
Q1. Can two nozzles of the same nominal diameter need different arrangements?
Yes. Their internal lengths, reductions and antenna positions can differ. Use dimensioned sections rather than assuming the connection name establishes equivalent measurement geometry.
Q2. Is a valve acceptable if it is normally open?
That requires review of the actual opening and internal geometry, as well as the process and maintenance design. "Normally open" describes an operating state, not radar suitability.
Q3. What should be sent when the drawing is unavailable?
Provide verified measurements and clearly oriented photographs obtained through a safe inspection procedure. Identify inaccessible dimensions rather than guessing them.
Summary
Approve the finished measurement path before loading settings. Send the as-built nozzle section and component list for an MV-RD12 mounting assessment.
