Fire test prediction for road tunnels
SOLIT Simulator runs the fire test for your fixed firefighting system (water mist or deluge) in a road tunnel, checks the design against 86 clause rules, and gives you and the client's reviewer a report with the evidence behind every number. Your own nozzle data in, for tunnel projects anywhere.
SOLIT² (also written SOLIT2) is the engineering guidance and full-scale test protocol for fixed firefighting systems in road tunnels. This tool predicts that test; it does not replace it.
Heat, temperature, visibility and toxic dose along your tunnel, predicted in seconds.
Automatic check against 86 clause rules.
Your own nozzle data, pressure and layout, run through the SOLIT² fire test.
Clear, evidence-based reports for the client's reviewer and your team.
Your tunnel, pipe network and pump entered as built, the plant sized to the result.
The problem
Whatever surprises a test holds, they arrive after the nozzles are chosen, the pipework is drawn and the client's reviewer has asked for evidence. SOLIT Simulator moves the first look earlier. Its fire test prediction shows how your water mist or deluge system is likely to behave in the SOLIT² test, which criteria it leans on, and which clauses still lack evidence, while the design can still change.
How it works
Design the system, predict the test, check it with computer simulation, and report the evidence.
Enter the tunnel, pipe network, pump and the nozzle as the tester measured it. Nothing about the nozzle is assumed.
The fast reduced-order engine (Tier 1) runs the worst cases in seconds: heat, temperature, visibility and toxic dose.
Run computer fire simulation (CFD) with FDS, the open fire-simulation software from NIST, on cloud machines, and see where it agrees or disagrees with the prediction. In beta.
Clause-by-clause compliance with evidence, planned or predicted, kept separate.
Why use it
SOLIT Simulator gives you the evidence, not just the result. See which criteria your design leans on, where it falls short and what to change before you build.
What it does today
What the app does now, and nothing it does not.
SOLIT² virtual fire test
Your nozzle system in the SOLIT² test gallery: Class A (a 150 MW heavy goods vehicle mock-up, covered) and Class B (diesel pools), at both airflow speeds of the protocol, with the activation time, ambient and fire growth the authority or client's reviewer sets.
Acceptance criteria that do not flatter you
Limits come from the project's own fire strategy, code and authority requirements, each entered with the document and clause it comes from. A criterion with no limit reads "not judged", never "passed", and a score appears only when every limit is set.
One project, every alternative
A project holds the tunnel, the fire, the ventilation and the authority's limits once. Each alternative design is run against that same base, so a reviewer compares like with like.
High, intermediate and low-pressure water mist, and deluge, each with its pressure band from NFPA 750, the water-mist standard of the US National Fire Protection Association. The engine is calibrated on high-pressure water mist only; the other three say on screen that they are not validated.
86 clause rules across the SOLIT² test protocol and a project rules file. Failing, evidenced and "needs evidence" are counted separately, and needs evidence is never counted as compliant.
A virtual fire test report with the issuer, the organisation and the issue time on every page. View it, or download it as a PDF.
E0 (illustrative) to E4 (full-scale test), with the track record of the quantity behind each figure, so a reviewer sees how far to trust a number before relying on it.
Enter your own road tunnel (bored or cut and cover, circular or box, one to four bores), hydraulic components and installed pump. Saved tunnels can be edited and reused. The result shows pump pressure, losses, plant size and the pipe and valve take-off, not only the fire.
Where a reduced-order prediction is not enough, run computer fire simulation with FDS on rented cloud machines and read the result beside the prediction. In beta: not yet generally available.
Every account is approved by hand and works in its own workspace. Team and admin accounts sign in with a second factor.
Ready to build safer
Get the evidence, find the gaps, and take a checked design to the full-scale test.
The output
A report that states its footing on the first page. The sample alongside uses invented values, to show the layout only.
Evidence E1, a prediction on estimated nozzle data. Held at E1 by: Dv50 (estimated).
| Criterion | Value | Limit set by the authority | Verdict |
|---|---|---|---|
| Target ignited | No | Must not ignite | pass |
| Peak heat release | 38 MW | at most 45 MW | pass |
| Visibility, flooded zone | 9 m | at least 10 m | FAIL |
| Heat flux | 4.1 kW/m² | not set | not judged |
| Requirement | Found | Status |
|---|---|---|
| Activation time set by the client's reviewer | Entered | Evidenced |
| Nozzle data stated by the tester | Estimated | Needs evidence |
| Fuel load matches the specified mock-up | Differs from the specification | Fails |
Example page with invented values. Not a result, and not a prediction for any project.
In the product
Screens show an illustrative example design at evidence level E0, not a real project, with example test conditions typed in so the simulation can run. No figure on them is a result.
Evidence
Each result carries an evidence level from E0 to E4. The tool computes E0 to E2 today. E3 and E4 are drawn on every ladder and never awarded yet.
A nozzle input is a placeholder or unstated.
Computed todayA prediction on estimated nozzle data.
Computed todayA prediction on measured nozzle data (Tier 1).
Computed todayTier 2 CFD agrees within the stated tolerances.
Not yet awardedA full-scale test compared with this prediction.
Not yet awardedA result is held at the level its least-evidenced nozzle input allows, and says which inputs hold it there.
Read this before you rely on it
Who it is for
Manufacturers of water-mist and deluge systems, engineering contractors, tunnel engineers, consultants and tunnel operators: on road tunnel projects anywhere, with your own data.
Run your own nozzle, as you measured it, through the SOLIT² fire test before a full-scale burn. See which criteria your system leans on and which values still need a test, with the evidence level stated on every result.
Test a system choice and a layout against the tunnel you have, then size the plant to it: pump pressure, ring main and zone losses, tank, pumps, and the pipe and valve take-off.
Read one report that says what is evidenced, what is only planned or predicted, and what no limit has been set for. Every limit shows the document and clause that set it.
Manufacturers check a system before a full-scale burn. Engineers test a layout before the design is frozen. Consultants and reviewing engineers read one report. Beta places are approved by hand, and a work email is needed.
CFD pricing
CFD runs on rented cloud machines: you pay for the machine time a run uses, from prepaid credit, with no subscription, and the price is fixed when a run starts.
Pricing for CFD runs is shown to registered users inside the app.
Taxes, where applicable, are shown on the invoice.
Beta programme
For tunnel engineers, engineering contractors, consultants, system manufacturers and tunnel operators. Beta users get the whole flow: design, SOLIT² fire test prediction, clause check and a PDF report, with CFD on demand as a beta option. Bring your nozzle data, your tunnel and the fire you want to test.
Questions
It predicts the SOLIT² fire test for a fixed firefighting system (water mist or deluge) in a road tunnel, checks the design against 86 clause rules, and writes a report with an evidence level on every number. A whole prediction takes seconds.
SOLIT² (also written SOLIT2) is the engineering guidance and full-scale test protocol for fixed firefighting systems in road tunnels. SOLIT Simulator predicts that test.
Manufacturers of water-mist and deluge systems who want to check a system before a full-scale test, tunnel engineers and engineering contractors who choose and size the system, and consultants, tunnel operators and reviewing engineers who read the evidence.
Your nozzle data as the tester measured it, your tunnel, and the fire you want to test. Nothing about the nozzle is assumed. To see a whole design run first, you can start from an illustrative placeholder head: it is marked placeholder and the result stays at the lowest evidence level.
Seconds, for the fast prediction of a whole test (Tier 1). Computer fire simulation (CFD) takes longer, and is in beta.
Request beta access with your work email. Personal addresses such as Gmail are not accepted. An administrator approves places by hand, in turn, and you are emailed a one-time code to set up your account.
CFD, computer fire simulation with FDS, runs on rented cloud machines on demand. Beta means it is not yet generally available. The fast prediction does not depend on it.
Tier 1 is the reduced-order engine that runs a whole SOLIT² test in seconds. Tier 2 is FDS computer simulation, run on demand and in beta. Where the two disagree, the disagreement is reported, not hidden.
No. The engine is calibrated against published reference tests, not validated, and every result says so on screen. Treat each figure as a prediction until a full-scale test of your system exists.
No. It does not replace a full-scale test; it helps you reach one with a design that has been checked. The SOLIT² test protocol (§3.4) says CFD shall not replace full-scale testing.
It is not test evidence, and it is not certified, accredited or approved by any authority. It does not set your acceptance limits: those come from your project's authority, and a limit nobody set reads "not judged".
High, intermediate and low-pressure water mist, and deluge, with pressure bands from NFPA 750. The engine was calibrated and checked on high-pressure water mist; for the other three the result says it is not validated for that type.
Yes, in beta. The cross-section is your design's, a box or a circular bore. The length follows your tunnel up to 600 m; a longer tunnel is modelled as the 600 m around the fire. A tunnel too short to hold the mock-up and the target is refused, with the length it would need.
By the machine time a run uses, paid from prepaid credit, with the price fixed when the run starts. Pricing for CFD runs is shown to registered users inside the app.
Use the support form. It reaches us directly and gives you a ticket number, and we reply by email. If you are signed in, it is also the Support tab beside Pricing in the app.
No. SOLIT Simulator is not affiliated with or endorsed by the SOLIT² project.