Working engineering cases
Every case below is a controlled starting basis that loads into the Plant Designer, where the same engines this platform always uses calculate the intake, the mass balance and the treatment train. Nothing here is a mock-up: open one and the diagram is built from the model you are looking at.
Two cases also carry a full worked walkthrough — design basis, stage balance, salt balance, derived requirements and captured evidence. See seawater RO step by step in the RO worked example, or ultrafiltration feeding RO in the UF + RO worked example. Every case here also shows pretreatment doing its job, which the pretreatment design gateway explains in engineering terms.
Synthetic engineering demonstration — not project design data. These are illustrative bases to replace with your own project inputs. They are not reference designs, vendor recommendations, installed plants or compliance cases.
Open the Plant Designer Small & Modular sizing Read the design guide
9 cases
Select a case to open it in the Designer. The figures on each card are the basis that gets loaded into your own input fields — every number that follows is calculated, not listed.
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Seawater — open intake, single RO stage
Baseline seawater case: an open seawater intake feeding a media filter, antiscalant and a single RO stage with remineralisation and a product tank. Start here to see a full seawater chain run end to end.
- Source
- Seawater — open intake
- Product basis
- 1000 m³/day
- Recovery
- 45%
- Feed TDS
- 35000 mg/L
- Product target
- 300 mg/L
Train open intake → Media filter → RO → Product
Explore design -
Seawater — beach wellfield, lower design flux
Same seawater chain, but abstracted from a beach wellfield at a lower RO design flux — the gentler-flux variant an engineer explores when scaling risk or membrane warranty drives the basis down.
- Source
- Seawater — beach wellfield
- Product basis
- 500 m³/day
- Recovery
- 40%
- Feed TDS
- 35000 mg/L
- Product target
- 300 mg/L
Train beach wellfield → Media filter → RO → Product
Explore design -
Brackish groundwater — single RO, higher recovery
A brackish groundwater case: lower feed TDS, a higher stage recovery and a lower feed pressure. Useful for seeing how a non-seawater source changes the balances and the duty the model reports.
- Source
- Brackish groundwater
- Product basis
- 800 m³/day
- Recovery
- 75%
- Feed TDS
- 4000 mg/L
- Product target
- 400 mg/L
Train Brackish groundwater → Media filter → RO → Product
Explore design -
Seawater — UF pre-treatment ahead of RO
A seawater case whose train adds an ultrafiltration stage in front of the RO stage, with UF-specific flux and filtrate-recovery fields. It exercises a different train shape and the separate UF/RO bases.
- Source
- Seawater — open intake
- Product basis
- 1200 m³/day
- Recovery
- 50%
- Feed TDS
- 35000 mg/L
- Product target
- 300 mg/L
Train open intake → Media filter → RO → UF → Product
Explore design -
Municipal seawater — larger flow, multi-vessel RO
A larger municipal-scale seawater case (2,000 m³/day product) with a higher element count per vessel, to exercise the multi-vessel RO sizing path and a bigger intake / pressure-pump duty.
- Source
- Seawater — open intake
- Product basis
- 2000 m³/day
- Recovery
- 45%
- Feed TDS
- 38000 mg/L
- Product target
- 250 mg/L
Train open intake → Media filter → RO → Product
Explore design -
Acceptance — 1,000 m³/day coastal well (single-RO basis)
The engineering-acceptance dataset re-runnable on the designer default train: 1,000 m³/day product from 3 beach wells via a multimedia filter at 97 % and a single-RO stage at 40 % on a 2,577.32 m³/day intake, with full source, hydraulic and sizing basis. A test input, not a reference design.
- Source
- Seawater — beach wellfield
- Product basis
- 1000 m³/day
- Recovery
- 40%
- Feed TDS
- 35000 mg/L
- Product target
- 500 mg/L
Train beach wellfield → Media filter → RO → Product
Explore design -
Two-Stage SWRO — staged array
A two-stage seawater RO array: the first stage rejects a concentrate that a second stage treats further, so both stages permeate becomes product and plant recovery exceeds a single stage. Demonstrates the concentrate-fed chain.
- Source
- Seawater — open intake
- Product basis
- 1000 m³/day
- Recovery
- 50%
- Feed TDS
- 35000 mg/L
- Product target
- 300 mg/L
Train open intake → Media filter → RO (2 RO barriers in the train) → Product
Explore design -
Two-Pass SWRO — permeate polishing
A two-pass seawater RO train: the first pass permeate is polished by a second pass for a lower product TDS. The first pass contributes no separate plant product, so overall recovery is lower than a single pass at the same feed.
- Source
- Seawater — open intake
- Product basis
- 600 m³/day
- Recovery
- 45%
- Feed TDS
- 35000 mg/L
- Product target
- 150 mg/L
Train open intake → Media filter → RO (2 RO barriers in the train) → Product
Explore design -
UF Prologue + Brackish RO
A brackish groundwater train with an ultrafiltration prologue ahead of a single RO stage: UF membrane area and TMP plus RO mass balance in one chain.
- Source
- Brackish groundwater
- Product basis
- 500 m³/day
- Recovery
- 75%
- Feed TDS
- 2500 mg/L
- Product target
- 250 mg/L
Train Brackish groundwater → UF → RO → Product
Explore design
What these cases do and do not produce
Calculated once you open a case
- Source and intake representation, including wellfield configuration.
- Feedwater analysis carried from the stated chemistry.
- The design basis: recovery, product target and the feed flow they imply.
- The treatment train and the Interactive Plant Flow projected from it.
- The mass balance — feed, product and concentrate, and concentrate TDS by salt conservation.
- Engineering requirements, each labelled input, derived or data-required.
Not produced until you select equipment
- Equipment, Schedule, BOQ and Report are downstream of the engineer choosing products from the verified catalog. A loaded case shows them as not started, and the report says so rather than inventing one.
Modelling boundaries
- Additional RO barriers may be represented in the treatment train, but detailed interstage or second-pass quantitative transfer is not currently modelled. Those cases show topology, not a verified two-stage balance.
- Membrane, recovery, flux and array staging in every case are an engineer or supplier basis to be replaced — not a catalogue entry and not a recommendation.
- Preliminary sizing, not final design. Everything remains subject to engineer review.