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A tank can contain liquid that production cannot withdraw. Usable tank inventory must account for the suction arrangement, minimum operating level and any required reserve. Reporting all measured volume as available stock can postpone replenishment until the pump is already approaching its operating limit.
Define which inventory quantity the remote screen shows
Keep gross contained volume, operationally withdrawable volume and planning reserve distinct. The unavailable heel may be defined by a suction elevation or a process requirement rather than the physical tank bottom. A reserve is a planning decision and should not be confused with liquid that the geometry makes inaccessible.
For a hypothetical constant-area tank of 4 m2, a liquid height of 2.0 m represents 8.0 m3 above the chosen zero. If the approved minimum withdrawal height is 0.3 m, 1.2 m3 lies below it, leaving 6.8 m3 above that limit. The example excludes other restrictions and is not a METRAVON performance claim.
| Quantity | Basis to document |
|---|---|
| Gross volume | The accepted tank geometry or strapping table and measured level reference. |
| Unavailable heel | The defined minimum withdrawal level and its associated volume. |
| Planning reserve | The operations-approved stock allowance used for replenishment decisions. |
| Data validity | The age and quality of the measurement used in the calculation. |
Use the actual geometry for usable tank inventory
For horizontal, tapered or irregular vessels, calculate both volumes from the tank table rather than multiplying a height difference by a constant area. Keep the table revision and withdrawal limit with the calculation. Changes to the suction assembly can alter usable stock without changing the radar's distance reading.
The METRAVON MV-RD12 supplies the liquid measurement for an appropriate installation. The RTU, PLC or inventory platform must implement any agreed stock calculation using the selected signal. Do not imply that the radar automatically knows the pump's operating limit or the site's reserve policy.
Show unavailable data before presenting available stock
Check freshness before applying a minimum-zero display rule or a reserve subtraction. A stale level converted into a positive available-stock number can look authoritative during a communications outage. Keep invalid data distinct from a valid calculation showing no withdrawable volume.
If the planning system estimates time until replenishment is needed, state the demand assumption and update it when consumption changes. A level measurement alone cannot predict delivery time, future demand or inventory mass without additional valid inputs.
Q1. Should the transmitter zero be moved to the withdrawal limit?
Not merely to simplify one report. Preserve an agreed physical reference and identify the calculation separately, unless the entire signal definition is deliberately revised and all users are updated.
Q2. Can the same reserve be applied to every tank?
Only when the operating policy supports it. Geometry, process demand, withdrawal limits and replenishment arrangements can differ.
Summary
Label what stock is actually available to use. Send the tank table, withdrawal limit and MV-RD12 signal requirement to define the measurement inputs for inventory reporting.
