Separate deposits from other capacity faults
Compare level-instrument behaviour with transfer and draw-down volumes, then inspect the relevant outlets and low points. Deposits are only one possible explanation for the apparent loss.
Locate the material before planning removal
Establish whether working volume was genuinely lost before removal begins. Level trends, tank geometry and observations after draw-down help separate settled material from instrumentation or inflow problems.
Check the exact point linked to the capacity loss
Removing bulk material is not enough if solids remain around the draw-off or foul a level device. The quotation should connect the cleaning endpoint to the operational problem that needs solving. For deeper deposits, read about tank sludge removal from recovery through to completion.
The clean is checked at the low points, outlets or instrument areas linked to the capacity concern. A following fill or operational test, rather than the cleaning note alone, shows whether usable volume has changed.
Where lost capacity may hide damage or a blocked fitting, decide whether the next task is an operating check or an inspection. That decision changes which areas need exposing and how the result is recorded.
Expected working volume should be compared with instrument readings and actual draw-down behaviour. If deposits are occupying space, the cleaning boundary should include the affected low points and outlets. The next operating cycle can show whether flow has improved, but formal capacity measurement is a separate task.