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💥 '''Internal explosion''' is a term used in [[Definition:Property insurance | property insurance]] to describe an explosion that originates within a building, vessel, or piece of equipment — as distinguished from an external blast caused by events outside the insured premises. The concept matters in [[Definition:Policy | policy]] drafting and [[Definition:Claims | claims]] adjustment because standard property wordings have historically drawn careful lines around which types of explosions are covered, excluded, or subject to specific sub-limits. In commercial and industrial risks, internal explosions may result from boiler failures, dust ignition, gas accumulation, or chemical reactions occurring inside insured structures or machinery.

⚙️ Coverage treatment varies by market and policy form. Under many traditional [[Definition:Fire insurance | fire insurance]] policies — particularly older wordings still influential in markets across Asia and parts of Europe — an internal explosion was not automatically covered unless the policy explicitly extended to include it, because the classic "fire" peril contemplated external causes of loss. Modern [[Definition:All-risk insurance | all-risks]] or "open perils" property forms in markets such as the United States, the United Kingdom, and Australia generally cover internal explosions unless a specific exclusion applies, but [[Definition:Named perils | named-perils]] policies still require the peril to be listed. For specialized equipment like boilers and pressure vessels, [[Definition:Boiler and machinery insurance | boiler and machinery]] (or engineering) policies provide dedicated coverage, and the definition of what constitutes an "explosion" — as opposed to a mere rupture or crack — can become a forensic and legal question during [[Definition:Loss adjustment | loss adjustment]]. [[Definition:Underwriting | Underwriters]] evaluating industrial risks pay close attention to explosion potential when assessing [[Definition:Risk survey | risk surveys]] and setting [[Definition:Deductible | deductibles]].

🔍 From a [[Definition:Risk management | risk management]] perspective, the distinction between internal and external explosions influences how insurers structure coverage, price industrial portfolios, and allocate [[Definition:Reinsurance | reinsurance]] protection. A chemical plant suffering an internal explosion may trigger not only property damage but also [[Definition:Business interruption insurance | business interruption]], [[Definition:Liability insurance | liability]], and [[Definition:Environmental liability insurance | environmental liability]] claims — making accurate peril classification essential for determining which policies respond and how [[Definition:Loss | losses]] are apportioned. Catastrophe modelers and [[Definition:Accumulation | accumulation]] managers also track explosion exposures, since a single internal explosion at a large facility can generate insured losses rivaling natural catastrophe events in severity.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Property insurance]]
* [[Definition:Boiler and machinery insurance]]
* [[Definition:Fire insurance]]
* [[Definition:Named perils]]
* [[Definition:Business interruption insurance]]
* [[Definition:Loss adjustment]]
{{Div col end}}

Definition:Internal explosion - Revision history

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