Check which material and time interval each reading represents before using density and flow together in a transfer report.
A dredging report can combine an online density reading, a flow total and a sample taken later in the transfer. Those records are useful only when their locations, timing and reporting basis are understood. This PMA application focuses on reconciling the inputs before accepting the resulting quantity.
Rhosonics describes SDM and SDM ECO use with flow meters at Beens Dredging. That establishes a relevant measurement context; it does not validate the calculation, sediment properties or installation on another vessel.
Start with the quantity required by the project: transferred slurry volume, wet slurry mass or dry solids mass. Keep these results separately named. Density and flow do not, by themselves, establish the in-situ volume of sediment removed.
Use one agreed reporting interval and preserve the raw inputs. The following fields help an engineer see whether the two signals describe the same transfer.
Mark the density meter, flow meter, sampling point, pumps and branches on a simple line drawing. Record any water addition or diversion between them.
Where the points are separated, establish how transport time will be accounted for. A simultaneous timestamp is not proof that both instruments saw the same material.
Record the start and finish time, flow-total readings, density units and the source of each logged value. Confirm clock alignment, averaging and the period represented by a transmitted reading.
Check whether a density value is instantaneous or averaged before using it with an interval total. Retain enough data to review changing conditions within that interval.
Mark water-only running, pump stops, flushing, empty or partly filled conditions and unavailable signals. Record the rule used to include, exclude or flag each interval.
Do not silently carry the last valid density across a signal gap. Keep any substituted value identifiable in the calculation record.
Keep the flow-to-volume step separate from the density-to-mass step. Multiplying representative slurry density by the corresponding transferred volume gives slurry mass on that stated basis.
A dry-solids result needs an additional validated concentration relationship or reference, with its material assumptions recorded. Do not label slurry mass as dry solids.
Agree the comparison and acceptance limits with the project team before the transfer. The record should explain the result as well as display it.
Review interval boundaries and units first, then meter locations and transport delay, then missing data and sample timing. Only after these checks should instrument configuration or the solids relationship be reconsidered.
State what was measured, what was calculated and what remains an estimate. Record the accepted intervals, exclusions and unresolved discrepancies alongside the final transfer result.
Send the line drawing, density and flow logs, reporting interval, calculation method and sediment reference results. Include the transfer quantity you need to report so PMA can review the measurement inputs for that purpose.
This reconciliation record complements the specialist dredging library. It is a measurement review framework, not a validated production calculation for a particular project.
Explore SDM ECO and discuss the sediment range, measuring position and signal integration.
Read the wider dredging duties and the manufacturer’s Beens account; its reported installation and outcomes are specific to that project.
Speak to the PMA team about your instruments, reagents or service requirements. Tell us what you need, and we’ll help you find the right next step.
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