Integrated Membrane System Design (IMSDesign) is one of several leading industrial water treatment design software tools, developed by Hydranautics to simulate reverse osmosis systems utilizing their specific membrane elements. It allows engineers to balance stage-level flux, predict membrane fouling, and proactively troubleshoot design limit alarms before physical plant construction. While running IMSDesign, many users often struggle to understand and analyze the reports, data, and warnings.
DaneshLine presents a step-by-step IMSDesign tutorial from how-to-install to practical case studies, focusing on how to properly analyze the output data, read the detailed reports, and fix those tricky system warnings.
Mastering the Core Features of IMSDesign: Inputs and Navigation
Designing a highly efficient reverse osmosis system requires a granular understanding of the software’s four primary input modules, bridging the gap between a basic draft and a comprehensive reverse osmosis software projection.
Water Analysis Screen
This screen acts as the chemical foundation of the design. The engineer must input the raw water analysis report with high precision, entering mg/L concentrations for primary ions.
- Ionic Balance: A successful charge balance is critical for accurate equilibrium thermodynamics. If the analysis is unbalanced, clicking the “Balance” function automatically adjusts Sodium or Chloride concentrations to satisfy the ionic equation.
- CCPP and Scaling Indices: The software calculates traditional saturation limits (LSI and SDSI), but crucially, it computes the Calcium Carbonate Precipitation Potential (CCPP) in mg/L as CaCO39. CCPP is highly regarded as a superior predictor of carbonate scaling because it quantifies the actual mass of precipitate that will form under specific hydraulic conditions, rather than just indicating a theoretical tendency.
Design Screen
Configure the system’s physical hydraulics, select appropriate membrane elements, and establish target recovery and permeate flow parameters. The element database allows practitioners to filter membranes by family:
| Membrane Family | Primary Application | Characteristics |
| CPA | High-Purity Brackish Water | Maximum salt rejection (up to 99.8%) for challenging feeds. |
| ESPA | Low-Energy Brackish Water | High permeability, ultra-low feed pressure requirements. |
| ESNA | Nanofiltration | Partial softening, high rejection of divalent ions. |
| SWC | Seawater Desalination | Extreme pressure tolerance for high-salinity oceanic feeds. |
Calculation and Results Screen
Clicking “Calculate” triggers the thermodynamic engine, executing precise mass and energy balance equations. The outputs tab displays the required feed pressure, localized permeate flux rates, salt rejection, concentration polarization (Beta factor) for every single element, and the overall specific energy consumption (SEC) in kWh/m³.
Post-Treatment Module
Execute thermodynamic mass and energy balance equations to generate localized performance outputs such as required feed pressure, specific energy consumption, and flux rates.
Case Study 1: Designing a Surface Water RO System via IMSDesign
Let’s put our mastery of the navigation to work by stepping through a concrete engineering project.
The Goal: We are setting up a single-pass, two-stage RO simulation. This time, our source is surface water (with an SDI < 3) carrying a Total Dissolved Solids (TDS) load of roughly 2,393 mg/L. Our target is to produce a solid 74 m³/h of pure product water while running the system at a 75% recovery rate.
Designer’s Note: This case study focuses exclusively on software navigation, flux balancing, and troubleshooting warnings inside the WAVE interface. If you are new to the core engineering calculations behind sizing an array such as manually determining your required number of pressure vessels, membrane elements, and staging ratios, it is highly recommended to read the foundational guide on How to Design a Reverse Osmosis Plant in 10 Easy Steps before proceeding. Once you have your baseline physical architecture mapped out, return here to execute the digital simulation.
Step-by-Step Simulation in IMSDesign
Step 1. Initiating the Project
Open the IMSDesign software.
1. From the main dashboard, click on New Project to begin.
Step 2. Defining Feed Water and Project Details
2. Enter your general project information at the top, including the Temperature (30°C) and Water Type (e.g., Brackish Surface MF/UF).
3. Input your detailed Feed Water Analysis, making sure to accurately enter the Cations, Anions, and pH levels.
4. Once your water profile is complete, click the Design tab on the top menu to configure the RO system.
Step 3. Setting Targets and Selecting Elements
5. In the Design window, set your target Permeate recovery to 75% and Permeate flow/train to 74 m³/h.
6. Click the Element type field under Stage 1 to open the element selection menu.
7. Mark the checkbox for your recommended membrane model (in this case, the ESPA2-LD).
8. Review the expected permeate TDS and feed pressure to ensure they align with your project goals.
9. Then click OK.
Step 4. Configuring the Array and Running the Simulation
10. Specify the physical layout of your system. Enter the number of elements per vessel (e.g., 6) and the total number of vessels for each stage (e.g., 10 for Stage 1, and 5 for Stage 2).
11. Optional: Click Floating Diagram in the top toolbar to generate a visual process flow of your layout.
12. Click the Run button to execute the calculation and generate the initial design report.
Step 5. Reviewing Warnings and Balancing the System
13. Review the Calculation Results carefully. You will notice a parameter highlighted in red—specifically, the Highest flux in Stage 1 is too high (36.8 lmh), indicating an imbalance.
14. Check the yellow-highlighted parameters (like CaF2 saturation) and the warning box, which alerts you that an Anti Scalant is required.
15. To fix the flux imbalance, click Return on the top menu to go back to the Design screen.
16. Click Perm. Pressure to enable permeate back pressure,
17. and set the permeate pressure for Stage 1 to 1 bar.
18. Click Run again to process the modified design.
Step 6. Final Review
19. Examine the updated Calculation Results. The red highlight should now be gone, meaning the flux between the stages is properly balanced.
20. Review your new RO system operating pressure (Feed bar) and confirm your Permeate quality (TDS is now at an acceptable 94.39 mg/l).
- Note: The Anti Scalant warning remains active, meaning you must plan for appropriate chemical dosing in your physical plant design.
IMSDesign: Desktop vs. Cloud Comparison
The transition from the traditional desktop-based application to the IMSDesign Cloud platform represents a major evolution in how engineers model membrane systems. If you’re weighing IMSDesign against other platforms like WAVE or Winflows, see our full comparison of RO design software platforms.
| Feature | IMSDesign Desktop | IMSDesign Cloud |
| Access/Installation | Requires local software installation. | Browser-based, no installation required. |
| Compatibility | Windows XP SP3, 7, 8, 10, or 11 only. | Cross-platform (Windows, macOS, Android). |
| Updates | Manual database and software updates. | Automatic updates with no IT intervention. |
| Storage | Projects saved locally on your workstation. | Secure design storage on AWS-protected servers. |
| File Support | Supports .des and .desx files since 2008. | Fully backward compatible with legacy .des/.desx files. |
| Your Data Security | Completely Secure | Exposed to Cloud vulnerability Risks |
This modernization enables significantly better accessibility and collaboration compared to the siloed legacy desktop program. While the cloud environment is more flexible, both versions ensure that your long-term project data remains accessible and functional.
Case Study 2: Optimizing a Brackish RO System via IMSDesign
The Design Challenge: The Flux Imbalance Trap
The Scenario: Imagine you are tasked with designing a brackish water RO system to produce 50 m³/h of clean water from a local well. You set up a classic two-stage system aiming for a solid 75% recovery rate , and you pack it with high-rejection CPA7-LD membranes to ensure top-tier water quality.
The Problem: You hit “Calculate,” but IMSDesign throws a critical red flag: “Stage 1 Average Flux Exceeded”.
When you dig into the numbers, you spot a massive imbalance. Your Stage 1 elements are getting crushed under a heavy workload of 22.5 LMH, while your Stage 2 elements are barely breaking a sweat at just 9 LMH.
If you commission the physical plant with this design, those front-end membranes are going to suffer from rapid colloidal fouling.
Your Task: How do you fix this severe flux imbalance and save your lead elements without drastically increasing your energy consumption?
FAQ: IMSDesign Operations
Yes, IMSDesign Cloud features complete backward compatibility. It can open, run, edit, and save legacy .des and .desx projection files created in desktop versions dating back to 2008.
Use Hybrid designs when you need to balance flux across the vessel. If your lead elements are fouling too quickly or your tail elements are under-utilized, mixing element types allows you to optimize performance without redesigning the entire system architecture.
It is a fantastic tool for initial feasibility studies or “back-of-the-envelope” calculations. It’s perfect for when you need to provide a client with a rough estimate in five minutes. Just remember: always run a full detailed projection before finalizing any contract or purchasing membranes.
Yes. The software is built to integrate these technologies. My advice? Start with your UF pretreatment stage to ensure your SDI (Silt Density Index) is under control before you even touch the RO section. It saves you from having to debug your RO design later.
Treat these as your design’s “early warning system.” A recovery warning usually means your permeate flow is too high for your feed pressure. Try adding an inter-stage booster pump or increasing your feed pressure incrementally. If the warning persists, you may need to reconsider your membrane configuration or element count.
In the software, a high Beta factor (above 1.20) is lowered by reducing system recovery, increasing feed flow, or enabling concentrate recirculation. On the plant floor, this corresponds physically to adjusting the feed pump VFD and throttling the concentrate valve to boost cross-flow velocities
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