Small & Modular • Demand-First Sizing

Small & Modular Desalination Sizing

Most small plants are sized from the demand they must serve, not from a product flow somebody already knows. This surface takes a community basis — or a direct product flow — and sizes forward through the platform’s existing engines: the demand engine, the plant mass balance, and the RO array engine. It is a sizing path, not a selection. No recovery, staging ratio, flux or package envelope is chosen here; each is yours, and every figure shown is what the named engine derived from the basis you stated.

Want to see a complete chain instead of a single sizing path? The Demo Gallery lists working treatment-train cases — seawater, brackish and UF-prologue trains — each of which opens in the Plant Designer as a real, editable design.

Basis

Supply either a community demand basis or a direct product flow. Optional fields narrow the picture; nothing is inferred from an absent value, and no field is defaulted to a plausible number.

Population served Per-capita demand (L/person/day) Peak factor Fire flow (L/min) — optional Fire duration (h) — optional …or a direct product flow (m³/day) Feed TDS (mg/L) Product TDS target (mg/L) Plant recovery (%) Operating hours (h/day) Design flux (L/m²/h) Element area (m²) Elements per vessel Pressure stages in the array Vessels in the first stage — optional

Method and engine sources

Demand — waterResources.calculateWaterDemand: population × per-capita demand, peak factor, and fire storage when a fire flow is supplied.
Feed and concentrate — plantMassBalance.analyzePlantMassBalance. The salt balance that turns a product flow into a feed flow lives there, so it is not restated here.
Membrane area, vessels, staging — water/ro/array.buildRoArray. When the first-stage vessel count is omitted, vessels are spread evenly and the result is labelled even rather than engineered.
Package scope — desalination/modularPackage.buildModularPackageScope. A modular package changes how the plant is delivered, not how it treats water.
No formula is duplicated on this page. If a step’s engine cannot run, the chain stops there and says which input is missing.

Engineering Disclaimer & Verification Notice

This surface composes existing sizing engines along a demand-first path. It does not select a process, choose a recovery or staging ratio, size a pressure vessel, or accept a modular package for delivery. Verify the basis with the engineer who owns the duty, and confirm any membrane, array or envelope figure against manufacturer data before it is used for procurement.

Workspace

Continue where you left off

Saved calculations in this browser can be reopened with their inputs intact.

Open Workspace