ETP duty
×2 design factor applied
Awaiting Valid Duty Parameters
Adjust the parameters on the left to compute live hydraulic values, ranges, and sizing verdicts.
Building or upgrading an ETP?
We size, supply and repair the transfer and slurry pumps for effluent plants — PP and SS316 builds for aggressive effluent.
ETP pump sizing explained
Design flow is not influent flow
ETP pumps are sized for the design flow, which includes recirculation, equalization and peak factors — commonly 1.5–2.5× the average influent. This calculator applies a 2× factor to the influent you enter, which covers equalization recirculation in most Indian ETP designs. Adjust the factor for your specific scheme.
Pump selection also considers duty/standby pairs: two pumps at 50 % design flow each, one on duty, is the standard arrangement for reliability.
Head components
TDH = static lift + friction + discharge head. Static lift is the height from the sump water level to the discharge point; friction covers the transfer line, bends and valves; discharge head is any pressure at the outlet, such as a filter feed. The calculator sums them and sizes the pump at the design flow.
For sumps with solids, the suction arrangement matters as much as the pump: keep the suction bell clear of the floor, and size the suction line for 0.6–1.5 m/s so solids stay suspended.
Materials and solids
Clean effluent at neutral pH suits PP or SS316 pumps. Acidic or high-TDS effluent needs PP, PTFE-lined or SS316 with the right seal — the compatibility matrix is the guide. Effluent with suspended solids needs open-impeller or slurry-type pumps with hardened parts; see the slurry sizing tool. Teflow repairs and re-builds ETP pumps with hardened parts across Gujarat — call +91 98251 62709.
Technical & Operational FAQs
Q1.How do I size an ETP pump?
Design flow = influent × 1.5–2.5 (recirculation/peak factor). TDH = lift + friction + discharge head. Then power = design flow × TDH × SG ÷ (367 × efficiency), rounded to the IS motor frame. The calculator applies a 2× factor and does the head and power math.
Q2.What is the design flow factor for ETP?
Common practice is 1.5–2.5× the average influent, depending on recirculation, equalization tank capacity and peak discharge. This calculator uses 2×; adjust your input if your scheme differs.
Q3.Which pump material for effluent?
Neutral clean effluent: PP or SS316. Acidic or salty effluent: PP, PTFE-lined or SS316 with compatible seals. Solids-bearing effluent: open-impeller or slurry-type with hardened wear parts. Check the chemical compatibility matrix for your specific effluent.
Q4.Do ETP pumps need duty and standby?
Yes — the standard arrangement is two pumps at 50 % design flow each, alternating duty, so a failure or maintenance stop never halts the plant. Some designs add a third for peak flows.
Q5.Why does my ETP pump clog?
Usually the suction arrangement or pump type: a too-small suction line drops velocity and lets solids settle, and closed impellers clog on fibrous or sticky solids. Open-impeller or non-clog pumps with correctly sized suction lines fix most cases.
Related Engineering Tools
Slurry Pump Sizing
Dosing Pump Sizing
pH Neutralization
Pipe Sizing Calculator
Slurry & Wastewater Repair
Water Treatment
Need a custom hydraulic audit or specific duty curve verification? Call +91 98251 62709 or Request a Detailed Engineering Quote.