An SWRO technical proposal is only as useful as the data that supports it. Seawater source conditions, intake arrangement, seasonal variability, product-water use, concentrate route, site environment, power, footprint, and operating model all affect the questions that must be resolved before equipment selection.
Describe the seawater source and intake
State whether the concept involves an open intake, beach well, intake basin, tanker supply, or another source arrangement. Note the location, sampling point, tidal or seasonal changes, nearby activities, temperature range, turbidity events, algae or organics observations, and the condition of existing intake infrastructure where available.
The intake description is not a substitute for a full study. It tells the engineering team which uncertainties require further data and which pretreatment, materials, access, or maintenance questions should be considered.
- Intake type and location
- Sampling point and source history
- Seasonal and weather-related variability
- Existing screens, pumps, and intake infrastructure
Provide the water-analysis package
A seawater analysis should be traceable to the sampling location and date. Include salinity or TDS, conductivity, pH, temperature, turbidity, SDI where measured, ions relevant to scaling review, organics where relevant, microbiology where relevant, and any local treatment history. If results come from different dates, identify that clearly.
Published RO design material shows why flow, pressure, staging, concentration, and energy-recovery considerations interact in seawater applications.[1] A generic seawater label cannot replace actual source-water evidence.
- Laboratory report and chain-of-sampling context
- Operating and seasonal source variation
- Pretreatment-relevant solids and organics data
- Scaling and corrosion review inputs
Define the output and residuals boundaries
Describe the product-water purpose, required volume profile, storage, distribution, post-treatment needs, and any owner or local requirements that have been supplied. Separate a desired outcome from a final guarantee. If the use is drinking water, process water, irrigation, or utility supply, record the applicable project documents rather than make generic compliance claims.
Concentrate is a project interface, not an afterthought. Identify the proposed discharge, treatment, collection, transport, or management route and any environmental-review process that applies. The supplier must understand where its responsibility begins and ends.
- Product-water use and quality objective
- Demand pattern and storage
- Concentrate route and interface owner
- Applicable project or local requirements
Add the site and execution data
Site data should cover plot layout, access, lifting, climate, humidity, corrosion exposure, available power, fuel or backup arrangements, drainage, communications, operator staffing, and preferred implementation sequence. Containerized deployment may change logistics but does not remove these inputs.
The RFQ should request a clear assumption list, PFD/P&ID level of documentation as appropriate, equipment schedule, interface schedule, test plan, and exclusions. This makes later technical and commercial comparison more transparent.
- Layout and access
- Power, controls, and communications
- Climate and materials exposure
- Document, test, and clarification schedule
Related Engineering Resources
Frequently Asked Questions
Can an SWRO proposal be prepared without a water analysis?
A preliminary discussion can identify missing information, but final process selection and performance commitments should be based on representative source and site data.
Why include brine information in the RFQ?
Concentrate management affects the project boundary, interfaces, environmental review, layout, and potentially the treatment concept itself.
Sources & Reading Notes
These sources support the engineering context of this guide. Final project decisions remain subject to current water data, owner requirements, applicable rules, and approved design documentation.
- DuPont Water Solutions — Industrial RO Systems and ConfigurationsRO process and seawater energy-recovery context.
- U.S. Bureau of Reclamation — Desalination and Water Purification ResearchDesalination research context.