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A radar level site survey can contain all the requested documents and still describe two different installations. An old drawing may show a short nozzle, a recent photograph may show an added reducer, and the controller may use a reference height entered before either change. Resolve these conflicts before an instrument is ordered.
Identify the tank and connection in every record
Put the equipment tag, connection identifier and date on the survey sketch and photographs. Mark the location on a wider tank photograph before taking close-up views. Several identical tanks can have different nozzle internals or process duties; a photograph with no tag is poor evidence for an order.
For a proposed METRAVON MV-RD12, distinguish G1 1/2A from 1 1/2 NPT, both listed connection options. A measured external diameter alone does not identify the thread or seal. Where the connection cannot safely be inspected in service, retain that item as unverified and arrange an approved inspection opportunity.
Radar level site survey discrepancies need an owner
| Conflict | How to resolve it |
|---|---|
| Nozzle | Measure the installed bore and total length, including adapters; compare with the proposed antenna drawing. |
| Datum | Locate the radar reference plane and the plant's level zero on one dimensioned section. |
| Wiring | Trace the actual terminal and input arrangement instead of relying on a spare cable label. |
| Duty | Ask the process owner to confirm current liquid, cleaning conditions and operating limits. |
Do not average incompatible dimensions or select whichever record permits the preferred model. Record the conflicting values, their sources, the responsible reviewer and the final accepted value. Distinguish an observed dimension from a drawing dimension and from a temporary estimate.
Release a usable quotation package
Issue one revision containing the accepted tank section, nozzle detail, output requirement and process conditions. Cross out superseded values clearly in the working record; the supplier should not have to guess which attachment governs. If a remaining uncertainty affects the connection, pressure boundary or usable measuring interval, request a conditional offer with that uncertainty named.
The MV-RD12's published 8-degree beam and 32 mm lens help assess the proposed location, but they cannot resolve an unknown internal obstruction. When the vessel cannot be opened, state which internal features have only drawing evidence. Schedule their confirmation before permanent installation rather than representing the survey as fully measured.
Changes after quotation need the same discipline. An extra flange adapter can alter antenna position; a revised liquid can change material suitability. Send the revised detail against the existing offer and obtain an explicit response before fabrication proceeds.
Survey handoff questions
Q1. Is the newest drawing always the correct one?
No. A recent drawing may still omit a field modification. Compare its revision history with the actual equipment and authorised change record. If they disagree, have the responsible discipline approve the as-built correction.
Q2. Can an estimated dimension be used for a budget enquiry?
Yes, if it is labelled as an estimate and the offer states what remains conditional. Do not use that estimate to approve a final antenna length, thread or flange assembly.
Summary
A survey is ready for ordering when its dimensions and process requirements describe one identifiable installation. Submit the checked survey revision and unresolved items so the quotation can separate confirmed configuration from work still awaiting site evidence.
