A professional workspace
Professional tools for fire safety, industry and hazardous materials
One system bringing together calculations, projects, materials, risk assessment and professional sources. Enter the data once, and every tool works on it together.
The fire safety workspace
Seven stages over the same data. Each stage reads what the ones before it already calculated, and never asks for it again.
Open a project
One project, one materials inventory, and every tool reads from it.
A workspace for entering project and material data. Does not calculate.
Open the tool- Bounded calculation
MAQ and control areas
Identifies the maximum allowable quantity in each control area and shows the calculation chain.
- Calculated:
- The allowable quantity is calculated from appendix ג by classification, use column and storey, with a lower and an upper bound for every cell and a full calculation chain.
- Still open:
- Footnotes a and b increase the quantity under protection conditions, but depend on editions of NFPA 400 and NFPA 13 that the procedure does not name. Footnote m contradicts itself between its English and Hebrew texts. On those paths a range is shown rather than a single value.
- What would resolve it:
- A ruling from the authority on the editions of NFPA 13 and NFPA 400 — the procedure cites NFPA 13 in seven footnotes and dates none of them, and a copy of the standard does not settle it. A ruling by the authority between the two texts of footnote m would close that one.
Fire load
Calculates fire load from quantity, calorific value and area, with a source for every calorific value.
Open the toolFire risk assessment
Determines the risk level for the building and for each control area under §4.3.2 of the procedure, and assembles the report for submission.
Uses results from MAQ and Control Area Check and Fire Load Calculator
Open the toolFire authority requirements
Search the official Israel Fire and Rescue Authority requirements by licensing or construction context.
Searches the official requirements register. Does not calculate.
Open the toolInspection readiness
A readiness questionnaire that produces an action list, without stating legal compliance.
A readiness questionnaire that produces an action list. Does not calculate and does not determine compliance.
Open the tool- Bounded calculation
Permit obligation
Checks whether a permit is required under the law in force today, and shows the date the filing obligation takes effect under integrated licensing.
- Calculated:
- The permit obligation under the Classification and Exemption Regulations 5756-1996 — classification under regulation 1, the exemption in regulation 2 and the two carve-outs in regulation 3 (50 kg in aggregate, 40 kg of type ב toxics), with a full chain of reasoning. Also: the filing dates under integrated licensing, following the postponement order of 20.07.2026.
- Still open:
- The First Schedule to the regulations is partly loaded (19 of some 300 items), and part א of the Third Schedule is partly loaded (10 of some 50 entries). Part ב is loaded in full as data, but its decision engine is switched off: what an empty cell means against a dash is not settled in law, group O is not named in the aggregation formula, and a substance named individually has no assignment to a risk group.
- What would resolve it:
- Loading the remaining First Schedule items and part א from the official source; and a legal ruling on the three questions in part ב, including publication of the director's instructions under section 13א(b), which have not been located.
Professional report
A single report bringing together every project calculation, with its sources, assumptions and open items.
Assembles a report from the tools' outputs. Does not calculate anything itself.
Open the tool
Fire dynamics
Established correlations from the fire safety engineering literature, which do not depend on a standard we do not hold. The equation is implemented here; every constant that is a property of a particular material — burning rate, radiant fraction, RTI — is entered by you together with the document it came from, and the tool supplies no value and offers no default.
Flame Height — Heskestad
Calculates flame height from heat release rate and fire base diameter, using the correlation L = 0.235·Q̇^(2/5) − 1.02·D.
Open the toolCharacteristic Diameter D* for an FDS Grid
The characteristic diameter D* and the cell size range from which an FDS grid sensitivity study begins.
Open the toolSmoke Layer Filling — Zukoski
The time until the base of the smoke layer descends to a given height in a compartment, against a t² fire, using Zukoski's plume correlation.
Open the toolVentilation Factor and Compartment Fire
The ventilation factor F = A_v·√H_v and the heat release rate the opening can sustain, deriving the familiar coefficient from its two components.
Open the toolCeiling Jet and Sprinkler Activation — Alpert
Temperature and velocity in the ceiling jet, and the activation time of a sprinkler or detector against a t² fire, using Alpert's correlations.
Open the toolThermal Radiation and Separation Distance
Calculates radiant heat flux at a given distance, or the distance to a target flux, using the point source model q̇" = χ_r·Q̇/(4π·R²).
Open the toolt² Fire Growth
Heat release rate at a given time, or the time to reach a given rate, using the growth curve Q̇ = α·t².
Open the toolPool Fire — Burning Rate and Heat Release Rate
Calculates the burning rate and heat release rate of a fuel pool using the Babrauskas correlation, from fuel constants the user enters together with their source.
Open the toolAwaiting standards
Calculators for liquids, hazardous materials and consequence engineering. The interface and the scenario are complete; values that are a regulatory requirement will be shown once each tool's data source has been verified.
Liquid Classification to NFPA 30
Classifies a flammable or combustible liquid by flash point and boiling point.
Open the toolLaboratory Fire Hazard Classification
Classifies a laboratory unit by quantity of flammable liquid per unit area.
Open the toolAboveground Tank Separation Distances
Separation distances between tanks and from property lines, by liquid classification.
Uses results from Liquid Classification to NFPA 30
Open the toolSafe Flow Velocity — Static Electricity
Flow velocity criterion for preventing static charge accumulation.
Open the toolInert Purging of Systems — NFPA 69
Calculates the quantity and rate of inert gas for continuous or batch purging.
Open the toolExplosion Overpressure — TNO Multi-Energy
Overpressure and consequence distances using the Multi-Energy model.
Open the toolFire Separation for High Hazard
Separation distances and separations required for high-hazard occupancies.
Open the toolWhy work with Hoshen's tools?
The tools were built out of real consulting work, so they keep what matters in a case file: a source for every figure, an explanation for every calculation, and a clear mark against anything that still needs checking.
One project, every calculation
Enter the building, the control areas and the materials once. Every tool reads from the same project.
Materials are entered once
A material entered for the MAQ check is also available to fire load and to the risk assessment, with its classification and its source.
A source for every result
Every numeric value has a document, an appendix, a table and a page. You can open it and see where it came from.
The full working, shown
Every result opens into "how we got here" — step by step, including what was not applied and why.
Professional uncertainty
Where a condition has not been verified, the system says so rather than guessing. There is no figure without backing.
A report ready to submit
A professional report with sources, assumptions and open items — ready to print or save as PDF.
Everything stays in your browser
Your data is stored in your browser alone and is never sent to Hoshen or to anyone else.
Built for industry and storage
Built around the fire risk assessment procedure for industrial and storage buildings and the official requirements registers.
Some tools are shown as a preview: the interface and the scenario are complete, but values that are a regulatory requirement are withheld until their data source has been verified. You can see exactly what the tool will do, without relying on a figure that has nothing behind it.
Need a professional review?
These tools give a first picture. For a specific review of the building, the materials and the requirements, we would be glad to work with you.