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A staged tank farm radar retrofit can leave old and new transmitters operating side by side. Different outputs and revised reference heights then need to remain traceable for each tank. Copying a setting from one location into another can produce a plausible but incorrect value, even when the setting was valid for the original installation.
Tank Farm Radar Retrofit: Standardise Only What Is Truly Common
Common wiring practices and documentation can reduce work, but nozzle geometry, liquid, measuring span and alarm elevations remain tank-specific. Use a common specification with an individual schedule for each location. Do not make a single approved pilot configuration the purchase description for every tank.
The MV-RD12 is a non-contact liquid radar offered with threaded or flanged connections and different electronics arrangements. A two-wire 4-20 mA/HART installation and a separately powered RS485 version require different interface reviews. The existing loop design must determine which ordered configuration is suitable.
| Item | Shared basis | Per-tank check |
|---|---|---|
| Hardware | Approved model family and documentation format. | Connection, seals, process conditions and output version. |
| Geometry | Reference naming convention. | Measured datum, nozzle and operating span. |
| Controls | Interface design and test method. | Channel identity, range, thresholds and equipment action. |
| Cutover | Hold points and responsible personnel. | Old settings, new settings, release time and recovery plan. |
Use the Pilot to Test the Method, Not Approve Every Tank
Choose a pilot that exposes representative installation and integration work. Document what it did not cover, such as a different liquid or a longer nozzle elsewhere. Resolve those exceptions before purchasing the remaining instruments. Preserve both successful tests and changes needed to the installation method.
Make the Handover Between Old and New Explicit
Save the old configuration, confirm the tank is in the approved operating state and identify which signal controls the process during the work. After installing the new unit, compare the physical level, local value and receiving channel before releasing it to normal use. Record the exact transition time for historical reports.
If the checks fail, follow a pre-agreed recovery procedure rather than copying more offsets until the values agree. Any temporary operating measure must have an owner and an expiry or removal condition. Do not leave an old and a new source simultaneously writing the same control tag.
Phased-Project Questions
Q1. Can old calibration values be copied into the new radar?
Use them as a reference only. Confirm the new instrument reference plane, measurement variable and interface behaviour. Reusing an old span is justified only after those conditions are reconciled and tested.
Q2. How should the quotation be divided?
Request the common supply requirements plus a tank-by-tank configuration schedule. Separate pilot work, remaining hardware and commissioning support so unresolved exceptions are visible before the wider order.
Summary
A staged MV-RD12 retrofit needs controlled differences as much as standardisation. Keep each tank's identity, release checks and transition record intact while using the pilot to improve the installation method.
