Hydraulic power from flow and static head; Hazen–Williams friction if pipe length and diameter are given. Motor is rounded with efficiency and a safety factor. No pump curve or NPSH.
Calculator
P(kW) ≈ (Q·H·SG) / (367·η); with SG = 1 this is ρ = 1000. Pipe length and diameter add Hazen–Williams friction (C ≈ 130).
Disclaimer: Calculations use general engineering relations and are for preliminary assessment only. They are not sufficient for design, quotation, equipment selection or investment decisions. Contact Envora Global for detailed hydraulic, chemical and process design.
Pump power is the hydraulic kW to move liquid at a given flow and head: P ≈ (Q × H × SG) / (367 × η). With SG = 1 this matches ρ = 1000 kg/m³. Static head is always required; pipe length and inner diameter add Hazen–Williams friction.
Pick the Envora skid duty: process-water transfer, tank fill, chemical dosing/injection, RO high-pressure feed, wastewater/recycle or cooling water. Typical η and safety factor are suggested; minor losses are a fraction of friction or an equivalent length — not a fitting catalogue.
Shaft power is hydraulic / η; the motor is rounded up with a safety factor to an IEC kW. Osmotic pressure, the pump curve and NPSHr are not produced; suction lift is a cavitation caution only. Final selection is Envora’s hydraulic profile and vendor software.
Mechanical and process engineers needing a first kW estimate for Envora transfer, tank-fill, dosing, RO HP, wastewater-recycle or cooling pumps.
Duty, flow (m³/h) and static head (m) are required. Suction lift is an NPSH caution only. Without a pipe, only static head and efficiency are used. C, η, SG and safety factor have defaults; velocity outside 0.8–2.5 m/s (≈3 m/s on RO HP) is flagged with a qualitative diameter hint.
Default water at 20 °C, SG = 1, ρ = 1000 kg/m³; entered SG or density scales power. HW is a water formula (no viscous correction). No curve, NPSHr, two-phase flow or VFD. The motor list is a coarse IEC series; voltage is a note, not a starter design.
Friction is taken as zero; only static head is used. That is usually optimistic. Long lines need inner diameter, C and equivalent length if relevant. High velocity triggers a qualitative larger-diameter hint.
Efficiency and the safety factor raise shaft power, then the next IEC kW is chosen. Duty/standby, temperature derating and a starter/VFD are separate. The voltage field is a note only.
For a coarse screen, yes. Osmotic pressure, stages, energy recovery and the vendor curve are missing. Feed this form with the RO calculator’s feed flow. Envora RO skids size the HP pump with cartridges and antiscalant.
No. Suction lift only produces a cavitation caution; NPSHr is not invented. NPSHa depends on atmospheric head, vapour pressure and the suction line and must be confirmed on site.
It suggests typical η and safety factor (transfer, tank, dosing, RO HP, wastewater, cooling) and Envora service notes. It does not change the formulas; you may override the values.
Envora Global’s engineering team prepares a project-specific pre-assessment covering water characterization, P&IDs, equipment lists, OPEX/CAPEX and turnkey delivery.
