Measure sump inflow, model actual discharge head, compare documented pump curves and retain installation, alarm and controlled commissioning results.
Confirm whether the application is groundwater or clear-water drainage and document permitted discharge and installation requirements. Record basin geometry, observed high-water history and the measurement method. Estimate inflow from a safely observed pump-off level rise only when basin cross-section and displaced volume are understood.
Record source/discharge reference elevations, actual pipe inside diameter, straight length and fittings. Include check-valve and local losses using the applicable data and the same velocity basis. Treat static lift, required residual pressure and friction as separate terms.
Enter documented points for each exact pump, speed and impeller within its permitted range. Locate the intersection with system head and compare delivery with the reviewed inflow case. Check intended liquid, minimum submergence, switch travel, cycling limits and service access in the actual manual.
Have the pipe route, basin, support, valve orientation, vent/anti-airlock details and electrical supply installed to the actual equipment and local requirements. Keep the float path free and establish high-water alarm and backup behavior appropriate to the site. For a battery backup, use its real load profile and usable energy.
Follow the manufacturer’s controlled water-test procedure. Confirm start/stop levels, unobstructed float motion, discharge delivery, leaks, valve behavior and alarm operation. Test the approved backup or failure response without allowing overflow. Record actual delivered volume and timing where a reliable measurement is possible.
Export the selected pump curve, pipe dimensions, observed inflow cases, commissioning results and exact manuals. Keep inspection and test intervals from the actual manufacturer and site plan. Recheck the hydraulic case after a pipe change, altered discharge destination or new high-water evidence.
Calculate observed cylindrical-basin inflow with an explicit reviewed design allowance. · Use that pipe and elevation basis for pump-curve comparison. · Compare actual curve intersections and show candidates below inflow or outside the documented range. · Compare measured inflow and delivery conditions with the saved pump case. · Save the verified curve and observed inflow basis.
Calculate full-pipe system head at candidate flows. · Export the installed discharge head calculation.
Estimate a battery-backup duty cycle only from actual pack and pump-side measurements.
Keep the equipment-specific installation and backup checklist. · Record dated start/stop, alarm, discharge and backup observations.
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Review actual total dynamic head, permitted curve range, basin and equipment instructions.
Separate straight-pipe losses, local losses and elevation in a consistent hydraulic model.
A dry-weather test may not represent seasonal groundwater or a storm event.
A pump or other obstruction displaces basin water and can invalidate a gross cylindrical-volume estimate.