Headroom keeps a deterministic, real-time COMAH threshold calculation for bulk hazardous materials sites. Every figure cites its source. No language model touches a single number.
Right now
One category is near a COMAH limit
Highest threshold use
Tank pairs too close
Inventory held
Substances blocked
COMAH threshold utilisation
Built for the sites that carry the risk
Fuel terminals, chemical distributors, and process sites move thousands of tonnes across dozens of tanks. Headroom holds the whole COMAH picture in one place, so a single delivery never quietly changes your tier.
Product
Each feature feeds the same deterministic engine. Changing an inventory figure, a classification, or a separation measurement updates every screen simultaneously — there is no manual reconciliation.
COMAH Aggregation
Every substance is scored against Schedule 1 of COMAH 2015 across all three hazard groups. The site's determined status updates the moment inventory changes — not at the next manual review.
Classification Drift
A reclassification can push a site up a tier with nothing physically arriving. Headroom attributes every threshold movement to its cause — stock change, reclassification, or both — using a counterfactual that holds quantities fixed.
Delivery Checks
Enter a substance and quantity. Headroom checks aggregation, separation, and physical tank capacity simultaneously and returns one verdict: yes, no, or the maximum it can safely accept.
Separation Register
Incompatible materials must be separated by a minimum distance or a rated barrier. Headroom checks every recorded pair against the compatibility rule set and flags any that fall short.
Headroom Matrix
For every substance on site, Headroom calculates the additional quantity each tank can accept before any constraint is triggered — and names the constraint that sets the limit.
Evidence Output
Every figure in the evidence output cites the rule that produced it. The report includes the change-of-position section needed to demonstrate that a reclassification was tracked, not discovered at inspection.
How it works
Set the site up once, then keep it current. Every screen the operations team touches is driven by the same engine that produces the regulator's report.
Add zones, capacities, separation distances, and barriers once. Import SDS data to classify each substance automatically.
Paste a CSV or enter quantities manually. The engine timestamps the position and retains the previous one.
The overview shows the determined tier, any threshold movements, and every separation problem — before you open a report.
Enter substance and quantity. Get a verdict and the maximum the site can safely accept right now.
Print or save the structured report. Every figure cites its source. Nothing is summarised by an AI.
Evidence
The Headroom evidence report is structured for a COMAH competent authority inspection. It does not summarise — it shows the full working: every contribution to every group, the qualifying quantity used, the rule applied, and the classified status that follows. The change-of-position section is the one most sites currently cannot produce on request.
No AI in the calculation
Thresholds, classifications, and verdicts are computed by explicit rule code, not inferred by a language model.
Reproducible
The same inventory and classification inputs produce the same output on every run.
Attribution by counterfactual
The report shows whether a tier change was caused by stock or by reclassification — holding quantities fixed while re-scoring against the new classification.
Ready for Schedule 4
Structured to support the information requirements of COMAH 2015 Schedule 4 Part 1.
Evidence output — extract
1 — Aggregation
COMAH 2015 Schedule 1 Part 3
3 — Change of position
Attribution by counterfactual — quantities held fixed
Chemlogic AI Ltd
Headroom is in early access. We work with COMAH duty-holders and their appointed consultants to configure the system for each site. Contact us to discuss your site's requirements.
