How Insurers Assess Risk in Chemical Manufacturing Facilities

Introduction

Chemical manufacturing is one of the most risk-sensitive sectors in UK commercial insurance. That’s not because every site is “dangerous” — it’s because the combination of flammable materials, reactive processes, pressurised systems, and complex supply chains can turn a small incident into a large loss.

When insurers assess a chemical manufacturing facility, they are trying to answer a simple question: how likely is a loss, and how big could it be? Underwriters look at your processes, your controls, your people, and your history to understand both frequency (how often things go wrong) and severity (how bad it gets when they do).

This guide explains the main areas insurers review, what good looks like, and how to present your risk clearly to secure better terms.

1) The starting point: what you make, how you make it, and what could go wrong

Underwriters begin with a clear description of your operations:

• Products manufactured (including hazardous classifications)
• Raw materials and intermediates used
• Process steps (batch vs continuous, temperatures/pressures, catalysts)
• Utilities (steam, nitrogen, compressed air, refrigeration)
• Storage and transfer methods (tanks, IBCs, drums, pipelines)
• On-site labs, blending, repackaging, and waste handling

They will map these details to core loss scenarios such as:

• Fire and explosion (including vapour cloud explosion)
• Toxic release and contamination
• Runaway reaction / thermal decomposition
• Mechanical failure of pressure systems
• Environmental impairment (soil/water pollution)
• Product contamination or recall
• Business interruption from plant shutdown

The more clearly you can explain your process and safeguards, the easier it is for an insurer to price the risk accurately — and avoid “worst case” assumptions.

2) Regulation and governance: COMAH, HSE expectations, and management systems

In the UK, insurers pay close attention to your regulatory environment because it is a proxy for both hazard level and management maturity.

COMAH status

If you fall under the Control of Major Accident Hazards (COMAH) Regulations, insurers will want to know whether you are:

• Lower-tier or upper-tier COMAH
• Subject to a safety report and emergency planning requirements
• Recently inspected by the HSE/Environment Agency and outcomes

COMAH doesn’t automatically mean you are uninsurable — but it does mean insurers expect strong process safety governance, evidence of hazard studies, and robust emergency arrangements.

Process safety management (PSM)

Even for non-COMAH sites, underwriters look for a structured approach to process safety, often aligned to recognised frameworks. Expect questions on:

• Management of change (MOC) for process, equipment, and staffing
• Permit-to-work (hot work, confined space, line breaking)
• Isolation and lock-out/tag-out
• Competence and training records
• Contractor management
• Incident reporting and learning culture

Insurers prefer evidence-based governance: written procedures, audit results, and a track record of closing actions.

3) Site construction, layout, and separation: limiting the size of a loss

A major driver of premium is not just the chance of an incident — it’s how far it can spread.

Underwriters assess:

• Building construction (combustible vs non-combustible)
• Compartmentation and fire walls
• Separation distances between process units, tank farms, and warehouses
• Drainage and bunding to control spill spread
• Location of critical control rooms and electrical switchgear
• Exposure to neighbouring risks (adjacent industrial sites, residential areas)

A well-designed layout can reduce the maximum foreseeable loss. If your most hazardous storage is separated and protected, insurers may be more comfortable offering higher limits and broader cover.

4) Fire and explosion protection: prevention, detection, and suppression

Fire remains one of the most common large-loss drivers in manufacturing. Chemical sites add complexity: different materials behave differently, and water is not always the right answer.

Insurers typically review:

Ignition control

• Hazardous area classification (ATEX/DSEAR zoning)
• Control of static electricity (bonding/earthing)
• Electrical equipment suitability and maintenance
• Hot work controls and supervision

Detection and alarms

• Fire detection type and coverage (smoke/heat/flame)
• Gas detection (LEL/toxic) where relevant
• Alarm monitoring (on-site, remote, 24/7)

Suppression and water supplies

• Sprinklers (where appropriate) and design standard
• Foam systems for flammable liquids
• Deluge systems for tank cooling
• Hydrants, hose reels, and firewater ring main
• Firewater retention to prevent environmental damage

Insurers also look at impairment management: how you manage shutdowns of sprinklers, pumps, or detection systems, and whether you have temporary controls.

5) Process safety and critical safeguards: the heart of chemical risk

For chemical manufacturing, insurers often focus on the safeguards that stop an incident escalating.

Common topics include:

• Pressure relief devices (PRVs), sizing, inspection, and discharge routing
• Instrumented safety systems (SIS) and proof testing
• Interlocks, trips, and emergency shutdown (ESD)
• Inerting and blanketing systems
• Temperature control and runaway reaction prevention
• Corrosion management and inspection regimes nInsurers may request evidence of hazard studies such as HAZOP, LOPA, or bow-tie analysis, plus action tracking. They want to see that safeguards are not just designed — they are maintained, tested, and owned.

6) Maintenance, inspection, and asset integrity

Breakdowns are expensive. In chemical manufacturing they can also be catastrophic.

Underwriters assess:

• Preventive maintenance schedules and completion rates
• Statutory inspections (pressure systems, lifting equipment)
• Non-destructive testing (NDT) and corrosion monitoring
• Calibration and testing of critical instruments
• Spare parts strategy for long-lead items
• Age and condition of key plant (reactors, boilers, compressors)

A strong asset integrity programme reduces both the likelihood of failure and the duration of downtime — which can improve property and business interruption terms.

7) People, competence, and culture

Insurers know that procedures only work when people follow them.

They look at:

• Training and competency matrices for operators
• Supervision levels, shift patterns, and fatigue management
• Safety leadership and near-miss reporting
• Contractor controls and induction
• Emergency response training and drills

A positive safety culture is hard to quantify, but insurers pick up signals quickly: tidy housekeeping, clear signage, well-run permits, and evidence that actions get closed.

8) Environmental risk: pollution, containment, and clean-up exposure

Environmental impairment can create long-tail claims and regulatory costs.

Underwriters review:

• Bunding and secondary containment for tanks and IBC storage
• Drainage plans and interceptors
• Spill response kits and training
• Waste storage, segregation, and licensed disposal
• History of spills, odours, or complaints
• Proximity to watercourses and sensitive receptors

If you need environmental liability cover, insurers will want detailed information on substances, volumes, and controls — and may require site surveys.

9) Business interruption: how long would it take to recover?

For many chemical manufacturers, the biggest financial impact is not the physical damage — it’s the downtime.

Insurers assess:

• Single points of failure (one reactor, one boiler, one power feed)
• Lead times for replacement equipment
• Reliance on specialist contractors
• Availability of alternative production sites or toll manufacturers
• Stock levels of raw materials and finished goods
• Customer concentration and contract penalties

They will also look at your selected indemnity period. If it would take 12–18 months to rebuild and re-qualify a process, a 12-month indemnity period may be too short.

10) Supply chain and logistics: inbound and outbound risk

Chemical manufacturing often depends on controlled logistics.

Expect questions on:

• Transport of hazardous goods (ADR compliance)
• Packaging standards and labelling
• Third-party warehousing and storage conditions
• Reliance on single suppliers for critical inputs
• Import/export exposure and border delays

Insurers may also consider product liability and recall risk if your chemicals are used in regulated downstream applications.

11) Claims history and loss learning

Past losses are one of the strongest indicators of future losses — but only if nothing changes.

Underwriters will ask:

• Five-year claims history (including near misses, if disclosed)
• Root cause analysis outcomes
• Corrective actions and verification
• Any recurring themes (leaks, pump seals, human error)

A well-presented narrative matters. If you can show what happened, what you changed, and how you verified it, you can prevent a single event from defining your risk profile.

12) Cyber and operational technology (OT): the modern risk factor

Many chemical sites rely on SCADA, PLCs, and networked control systems. Insurers increasingly ask about cyber resilience because a cyber event can stop production or create safety impacts.

Key areas include:

• Segmentation between IT and OT networks
• Access control and multi-factor authentication
• Patch management approach for OT
• Backups and recovery testing
• Incident response plan and tabletop exercises

Even if you are not buying cyber insurance, these controls can influence how an insurer views operational resilience.

13) What information insurers typically request (and how to prepare it)

To get accurate terms, prepare a clear underwriting pack. Common items include:

• A concise operations summary (what you make, key hazards)
• Site plan showing layout, separation, and storage
• List of hazardous substances and maximum quantities on site
• COMAH status and recent inspection outcomes (if applicable)
• Fire protection details (detection/suppression/water supplies)
• Process safety documentation overview (HAZOP, MOC, PTW)
• Maintenance and inspection approach for critical equipment
• Business continuity and disaster recovery plan
• Five-year claims history

Good presentation reduces back-and-forth, speeds up quoting, and helps you avoid conservative assumptions.

14) How to improve insurability (and potentially reduce premium)

While every insurer has its own appetite, the themes are consistent. Practical steps that often help include:

• Tightening hot work controls and contractor supervision
• Improving segregation of flammables and oxidisers
• Upgrading detection and suppression where appropriate
• Formalising impairment management for fire systems
• Strengthening MOC and action tracking
• Demonstrating asset integrity KPIs (inspection completion, overdue work)
• Reviewing business interruption indemnity period and dependencies

The goal is not to “tick boxes”. It’s to show that you understand your hazards and manage them proactively.

Conclusion: make it easy for underwriters to say yes

Insurers assess chemical manufacturing risk by looking at hazard, controls, and the size of a potential loss. Strong process safety, well-maintained protection systems, good site layout, and clear evidence of governance can make a major difference to both cover availability and price.

If you want better insurance outcomes, treat underwriting like a professional presentation: explain your process, show your safeguards, and demonstrate that you learn and improve.

Call to action

If you run a chemical manufacturing facility and want a clearer view of your insurance options, speak to a specialist broker who understands process safety, UK regulation, and how underwriters think. A well-prepared submission can unlock broader cover and more competitive terms.