Why the Process Industries MBD Book Has Become a Selective Underwriting Class
Machinery breakdown (MBD) cover for Indian process industries has been an unhappy class for the non-life market through 2022 to 2025. The combined ratio on commercial MBD across cement, steel, paper, and petrochemical accounts moved above 105 percent in 2023, deteriorated further in 2024 with several large turbine and kiln losses, and remained above 100 percent through 2025 despite progressive premium hardening. IIB MBD loss-cost benchmarks have moved materially upward across most occupancy categories through this cycle, particularly cement kilns, steel mill electrical equipment, and paper machine drives.
The Indian process industries collectively carry installed capacity of approximately 600 million tonnes of cement, 180 million tonnes of crude steel, 28 million tonnes of paper and paperboard, and 250 million tonnes of petrochemical production, with capital deployed at replacement cost in the INR 14 to 18 lakh crore range across the four sectors. The MBD book on this capital base produces gross written premium of approximately INR 6,500 to 8,200 crore annually, with claims experience driven by a small number of severe losses on individual high-value machinery assets and a long tail of moderate losses on the broader equipment population.
The 2026 underwriting position on process industries MBD is selective. Insurers have tightened acceptance criteria on cement kilns above 8,000 tpd capacity, on integrated steel mill main drive equipment, on paper machine continuous-operation lines, and on petrochemical reactor and compressor trains with operating histories above 10 years. Sum-insured methodology, deductible architecture, time-element deductibles for loss of profits, and exclusion language for gradual deterioration have all moved in the cedant's favour through the 2024 to 2026 cycle. Brokers placing process industries MBD covers are now operating in a tighter market than at any point since the early 2010s reinsurance hardening cycle.
This guide lays out the 2026 underwriting framework for process industries MBD across the four primary sectors: cement, steel, paper, and petrochemical. It covers sum-insured methodology, deductible structures by machine class, time-element versus amount deductibles for downtime, exclusion language particularly around gradual deterioration, IIB loss-cost benchmarks, and the policy wording moves that the recent loss cycle has driven.
Sum-Insured Methodology: Replacement Value versus Market Value versus Reinstatement
The first underwriting question on process industries MBD is the sum-insured basis. The Indian market practice uses three distinct bases with different applications across machine types and account structures.
Replacement value basis
Replacement value is the cost to procure and install equivalent new machinery of similar specification and capacity. The basis is the default for MBD on cement kilns, steel mill main drives, paper machine drives, and petrochemical primary process equipment. Replacement value is the basis that gives the insured a clean recovery position because reinstatement of damaged equipment is the realistic post-loss action for major process machinery.
The replacement value computation should reflect current procurement and installation costs, not historical book value. The distinction matters because process machinery typically carries long service lives (kilns and steel mill drives 25 to 40 years, paper machines 20 to 30 years, petrochemical compressors 15 to 25 years) with significant cost inflation across the service life. A cement kiln procured at INR 180 crore in 2005 may have a replacement cost of INR 380 to 450 crore in 2026, with the original procurement cost no longer relevant to the indemnity position.
Market value basis
Market value is the depreciated value of the machinery reflecting age, condition, and useful life. The basis is used on MBD for ancillary equipment (transformers, switchgear, motors below specified ratings, balance-of-plant equipment) where reinstatement may not be the realistic post-loss action and where the insured may opt for replacement with equivalent depreciated-condition equipment.
The market value basis carries higher dispute risk at claim time because the depreciation determination is contested between the surveyor and the insured. The 2026 practice for process industries MBD typically restricts market value basis to specific equipment categories defined in the policy schedule rather than allowing market value as a default fallback.
Reinstatement value with average clause
The reinstatement value basis applies when the policy includes an explicit reinstatement clause requiring the insured to reinstate the damaged machinery with equivalent new equipment and the indemnity is paid on reinstatement-cost basis. The reinstatement basis requires careful handling of the average clause, where under-insurance relative to the reinstatement cost reduces the indemnity proportionally. Process industries insureds frequently under-insure at the time of the loss because reinstatement cost has appreciated relative to the policy sum insured during the policy year.
Account-level structuring
Large process industries accounts often use a tiered sum-insured structure: replacement value for the high-value primary machinery (Tier 1), market value for the mid-value ancillary equipment (Tier 2), and a blanket sum insured for the low-value population (Tier 3). The tiered structure simplifies the claims handling for routine small losses on the Tier 3 population while preserving the appropriate basis for the high-value primary machinery.
The 2026 underwriting practice is to require the insured to document the sum-insured basis for each machine class in a schedule that forms part of the policy, with the schedule reviewed annually at renewal. Accounts that submit blanket sum-insured figures without machine-class breakdown are increasingly being rated at higher premium loadings to reflect the disclosure gap.
Deductible Architecture by Machine Class: Turbines, Kilns, Presses, and Reactors
The 2026 MBD deductible architecture for process industries operates at machine-class level rather than as a flat policy deductible. The structure recognises that different machine types carry materially different loss frequency and severity profiles and that flat policy deductibles either over-insure low-frequency high-severity exposure (turbines, large transformers) or under-insure high-frequency moderate-severity exposure (motors, pumps, drives).
Steam and gas turbines
Steam turbines in steel mill captive power, paper mill cogeneration, and petrochemical site power applications, and gas turbines in petrochemical and refinery cogeneration applications, carry the highest single-machine loss potential in process industries MBD. Turbine deductibles in 2026 placements typically run at INR 50 lakh to INR 2 crore for the steam turbine population, with gas turbines often higher at INR 1 to 5 crore depending on machine rating. The deductible is structured as a flat amount rather than a percentage of sum insured to manage the cedant's exposure on the moderate-loss bucket where turbine bearing damage, blade erosion, and rotor faults produce repair claims in the INR 1 to 8 crore range.
Cement kilns
Cement kilns are the highest-severity loss class in cement MBD. A kiln tyre failure, kiln shell collapse, or refractory failure can produce material damage losses in the INR 25 to 80 crore range plus BI losses extending over 60 to 180 days of repair downtime. Kiln deductibles in 2026 placements typically run at INR 1 to 5 crore for the material damage component plus 14 to 30 days time-element deductible for the loss of profits component, with higher deductibles for kilns above 8,000 tpd capacity and for kilns in continuous operation above 10 years since last major refurbishment.
Hydraulic and mechanical presses
Hydraulic presses in steel mill rolling operations and mechanical presses in steel forging operations carry moderate frequency and severity exposure. Press deductibles in 2026 placements typically run at INR 25 lakh to INR 1 crore with the deductible scaling by press capacity and operating duty cycle. The press population in integrated steel mills can include 40 to 80 individual press units, with the policy deductible applying per loss occurrence rather than per machine.
Petrochemical reactors and compressors
Petrochemical primary process equipment including reactors, compressors, distillation columns, and heat exchangers carries the highest aggregate exposure in process industries MBD because the equipment population is concentrated and the loss-of-profits dependency is severe (a single reactor failure can shut down an entire production train). Reactor deductibles in 2026 placements typically run at INR 2 to 8 crore for material damage plus 21 to 45 day time-element deductibles for loss of profits. Compressor deductibles run at INR 1 to 4 crore plus 14 to 30 day time-element deductibles. The deductible structure recognises that petrochemical insureds typically carry redundancy and spare-equipment arrangements that absorb the lowest-severity exposure without insurance recovery.
Paper machines
Paper machine drives, headboxes, dryer sections, and calenders form the primary machinery in continuous paper production. Paper machine deductibles in 2026 placements typically run at INR 25 lakh to INR 1.5 crore for material damage plus 7 to 21 day time-element deductibles for loss of profits. The 2024 to 2025 paper sector cycle of moderate to severe drive-failure claims at several integrated mills pushed the deductible structure upward through the renewal cycle.
Ancillary equipment population
The broad ancillary equipment population (motors below specified ratings, pumps, switchgear, transformers below 25 MVA, instrumentation, conveyor systems) typically carries a single per-loss deductible of INR 1 to 10 lakh depending on account size and risk improvement profile. The ancillary population produces high-frequency moderate-severity claims that the deductible structure manages without requiring machine-class-specific treatment.
The 2026 underwriting practice is to negotiate the deductible architecture at placement, with the schedule of deductibles forming part of the policy and clearly distinguishing material damage from time-element components.
Time-Element versus Amount Deductibles for Downtime: The Loss of Profits Connection
Process industries MBD frequently couples with loss of profits (LOP) or machinery loss of profits (MLOP) cover responding to the BI loss following the machinery damage. The deductible structure on the LOP component uses two distinct logics, and the choice between them affects both pricing and claim resolution.
Time-element deductibles
Time-element deductibles operate on a number-of-days basis. A 14-day time-element deductible means the LOP indemnity commences 14 days after the machinery damage occurs, with the insured absorbing the gross profit loss for the first 14 days. The time-element structure is the dominant MLOP deductible logic in Indian process industries in 2026.
The time-element deductible operates cleanly when the machinery damage causes immediate operational shutdown with continuous restoration activity. A cement kiln tyre failure that requires 80 days of repair, on a 21-day time-element deductible, produces 59 days of LOP indemnity. The insured absorbs the gross profit loss for days 1 to 21 and recovers the gross profit loss for days 22 to 80.
Time-element deductibles produce dispute when the restoration is not continuous. A staged restoration with intermittent production resumption complicates the calculation: does the deductible apply once at the start of the loss, or does each restoration phase carry its own deductible? Modern 2026 wording typically clarifies this with explicit aggregation language treating the entire restoration period as a single occurrence with one deductible application.
Amount deductibles for downtime
Amount deductibles operate on a financial loss basis. An INR 2 crore amount deductible means the LOP indemnity commences when the cumulative gross profit loss exceeds INR 2 crore. The amount-deductible structure produces a different outcome than the time-element structure where the insured's gross profit per day is variable across the downtime period.
Amount deductibles are used in some petrochemical and chemicals MBD placements where the gross profit per day varies materially across the production schedule and the time-element structure would either over-insure or under-insure depending on when the loss occurred. The amount-deductible structure is less common in cement, steel, and paper applications where the gross profit per day is more stable across the production cycle.
Indemnity period
The indemnity period on the LOP cover defines the maximum duration over which BI loss can be claimed. Standard indemnity periods in 2026 process industries placements run at 12, 18, 24, or 36 months. The choice of indemnity period reflects the realistic restoration timeline for the most severe potential machinery loss: a cement kiln complete failure with full shell and refractory replacement realistically takes 12 to 18 months, while a petrochemical reactor complete replacement can take 18 to 36 months depending on equipment lead time.
Pre-loss reinstatement preparation
The 2026 MBD wording increasingly requires the insured to maintain documented restoration plans for the most severe potential losses, with pre-qualified vendor relationships, spare-parts inventory commitments, and contingency operational arrangements. The wording supports the loss-of-profits indemnity logic by ensuring that restoration proceeds without unnecessary delay, which protects the cedant against extended LOP exposure caused by the insured's restoration planning gaps rather than the underlying machinery failure.
Exclusions: Gradual Deterioration, Wear and Tear, and the Policy Wording Wars
MBD policy exclusions are the most contested element of the wording in 2026 process industries placements. The exclusion that has driven the most policy wording dispute through 2023 to 2026 is the gradual deterioration exclusion, which excludes damage arising from progressive deterioration of the machinery over time rather than from sudden and accidental damage.
The gradual deterioration distinction
Machinery damage in process industries frequently occupies an ambiguous zone between sudden accidental failure and progressive deterioration. A bearing failure may be the consequence of gradual lubrication degradation over months (progressive deterioration) or of a sudden lubrication interruption from contamination (sudden accidental damage). The same physical failure mode can be characterised either way depending on which expert opinion the surveyor or the insured commissions.
The 2026 policy wording in process industries MBD typically uses the following formulation: covered loss is sudden, unforeseen, and accidental physical damage to insured machinery, excluding damage arising from gradual deterioration, wear and tear, corrosion, erosion, rust, gradual scaling, gradual fouling, or other gradual processes. The wording places the burden on the insured to demonstrate that the proximate cause of the damage was sudden and accidental rather than gradual.
The 2024 cement industry dispute cycle
The Indian cement industry MBD claims through 2024 produced a cluster of disputes on the gradual deterioration exclusion, particularly on kiln tyre cracks and kiln shell deformations. The insurer position in several cases was that the damage was the result of gradual fatigue accumulation across years of operation, falling within the gradual deterioration exclusion. The insured position was that the final crack or deformation was a sudden event triggered by an identifiable stress event (thermal shock, mechanical shock, foreign-body ingress), falling within the sudden-accidental cover.
The resolution of the 2024 cycle disputes was mixed: some cases settled at reduced indemnity reflecting the wear-and-tear contribution, some cases proceeded to formal dispute resolution under the policy arbitration clause, and a small number reached litigation. The cycle drove the 2025 to 2026 wording tightening with more specific gradual-deterioration language and a clearer split between the wear-and-tear component (excluded) and the residual sudden-accidental component (covered).
Defect exclusions
The other primary exclusion class is the defect exclusion, covering damage arising from inherent design defects, faulty workmanship, or defective materials. The defect exclusion in 2026 process industries placements typically excludes the cost of repairing or replacing the defective item itself but covers the consequential damage to other property arising from the defect. This formulation, known as the LEG 2 wording (London Engineering Group 2nd wording), is the standard in major process industries placements.
The alternative LEG 3 wording covers both the defective item and the consequential damage and is occasionally negotiated for the highest-quality insureds with strong risk management and limited claims history. The choice between LEG 2 and LEG 3 is a major placement negotiation point.
Operator error and maintenance failures
The operator error and maintenance failure exclusions in 2026 process industries placements typically exclude damage arising from the insured's failure to follow the manufacturer's operating instructions or to maintain the machinery in accordance with the manufacturer's maintenance schedule. The exclusion is enforced through documentation requirements at claim time: the insured must produce maintenance records demonstrating compliance with the schedule, operator training records demonstrating competent operation, and incident reports demonstrating timely escalation of operational anomalies.
Cyber and IT-driven failures
The 2026 MBD wording explicitly excludes damage arising from cyber events affecting industrial control systems, distributed control systems, or programmable logic controllers. The exclusion responds to the growing exposure from cyber-induced machinery damage, which is treated as cyber loss rather than MBD loss. The boundary between the two exclusions and covers is increasingly being negotiated as part of integrated cyber-physical placements rather than left to dispute at claim time.
IIB Loss-Cost Benchmarks and the 2026 Pricing Picture
The Insurance Information Bureau (IIB) publishes commercial lines loss-cost benchmarks that form the operative pricing reference for Indian process industries MBD. The 2025 to 2026 IIB update is the most recent reference and the basis for 2026 placements at major Indian insurers.
Loss-cost structure
The IIB loss-cost framework reports gross loss cost per INR 1,000 of sum insured for each occupancy and machine-class combination. The framework is built from claims experience across the participating insurers covering 2018 to 2024 with progressive updates. The output is a base loss cost that the insurer then adjusts for the specific account's risk improvement profile, claims history, and reinsurance structure.
2025 to 2026 movements
IIB does not publish a single headline percentage for MBD loss-cost movement, and the figures below are indicative directional estimates based on broker placement experience across the recent loss cycle rather than published IIB numbers. Brokers should obtain the current loss-cost tables from the underwriting carrier for any specific account. The broad direction relative to the 2022 to 2023 baseline has been as follows.
- Cement kilns above 8,000 tpd: loss cost up sharply, with the cluster of large kiln losses through 2023 to 2024 at several major cement producers the principal driver.
- Integrated steel mill main drives: loss cost up sharply, driven by drive-failure and rolling-mill electrical equipment losses through 2024.
- Paper machine drives: loss cost up materially, driven by the moderate to severe drive-failure claims at several integrated paper mills.
- Petrochemical reactors and compressors: loss cost up moderately, reflecting moderate frequency at lower severities combined with increased severity expectation at ageing equipment.
- Ancillary equipment population: loss cost up modestly, driven by general claims inflation rather than specific structural shifts.
Application in 2026 placements
The IIB loss cost is the starting point for the underwriter's pricing calculation. The underwriter then applies account-specific adjustments for the insured's risk improvement profile (engineering survey findings, maintenance discipline, operator training, instrumentation and monitoring quality), claims history (last 5 to 10 years of MBD claims with severity and frequency), and reinsurance structure (treaty terms, facultative support, retention level).
For a cement producer with strong risk improvement (continuous condition monitoring, predictive maintenance, structured operator training, integrated safety management system) and a clean claims history over 5 years, the underwriter may apply a 25 to 40 percent discount to the IIB base loss cost. For a producer with weaker risk improvement and significant claims history, the underwriter may apply a 30 to 60 percent loading.
The net effect for the buyer is that 2026 MBD premium on a major cement producer with strong risk management is approximately 15 to 35 percent higher than the 2022 to 2023 equivalent, while a producer with weak risk management may see 50 to 80 percent or higher premium increases. The dispersion in outcomes is wider than at any time in the recent past, with risk improvement now a primary lever in the placement conversation.
Reinsurance treaty position
The 2026 reinsurance treaty position on process industries MBD has tightened in parallel with the IIB loss-cost update. Treaty terms now include explicit machine-class sub-limits, tighter aggregate caps on cement and steel MBD events, and named-machine carve-outs for the highest-exposure individual assets. The cedant's facultative placement on the largest individual machines (cement kilns above INR 350 crore replacement value, steel main drives above INR 200 crore, petrochemical reactor trains above INR 500 crore) has become the dominant placement mode for the high-value exposure, with treaty supporting the smaller individual exposures.
Sector-Specific Underwriting Notes: Cement, Steel, Paper, Petrochemical
The four primary process industries sectors carry distinct MBD risk profiles. The sector-specific underwriting notes below capture the 2026 position on each.
Cement
Indian cement industry MBD focuses on kilns, mills, and clinker handling. The kiln population includes pre-heater rotary kilns of 4,000 to 12,000 tpd capacity at major producers including UltraTech, Shree Cement, Dalmia Bharat, Ambuja, ACC, and JSW Cement. The MBD loss profile shows high single-loss severity (kiln losses of INR 25 to 80 crore material damage plus 60 to 180 day LOP exposure) with low frequency at well-maintained operations. The 2026 underwriting position on cement kilns above 8,000 tpd is selective, with risk improvement evidence required for placement at competitive terms.
Vertical roller mills (VRMs) for raw material and cement grinding are the second material exposure, with gearbox failures and roller assembly damage producing claims in the INR 8 to 25 crore range. The 2026 underwriting position on VRM gearboxes requires evidence of vibration monitoring and lubrication quality management.
Steel
Indian integrated steel mill MBD focuses on main drive equipment, rolling mill stands, electrical equipment, and continuous casting machines. The main drive failure on hot strip mills or plate mills can produce material damage in the INR 60 to 150 crore range plus LOP exposure of 90 to 180 days. The 2026 underwriting position requires detailed electrical and mechanical condition monitoring evidence for the main drive population.
Electric arc furnaces (EAFs) at integrated and stand-alone mini-mills carry a separate exposure profile with transformer failures, electrode arm damage, and shell damage as the primary loss modes. EAF deductibles in 2026 placements typically run at INR 50 lakh to INR 2 crore with 7 to 21 day time-element deductibles.
Paper
Indian paper industry MBD focuses on paper machine drives, headboxes, dryer sections, calenders, and recovery boiler equipment in integrated kraft mills. The 2026 underwriting position on paper machine drives requires evidence of bearing-monitoring and lubrication-quality programmes. Recovery boiler exposure in integrated kraft mills is a distinct underwriting class given the explosion and pressure-vessel risk, with separate deductibles and sub-limits.
Petrochemical and refining
Indian petrochemical and refining MBD focuses on reactors, compressors, fired heaters, distillation columns, and heat exchangers. The 2026 underwriting position on reactor and compressor trains at ageing facilities (above 15 years of operation) requires detailed turnaround inspection evidence and life-extension analysis. The IOCL Paradip refinery, the Reliance Jamnagar complex, the Nayara Vadinar refinery, and the BPCL Mumbai and Kochi refineries are the largest individual exposures in the Indian petrochemical and refining MBD book.
Common underwriting threads across the sectors
Four underwriting practices have emerged as common across the four sectors in 2026.
- Engineering survey at the placement stage is now standard for accounts above INR 5,000 crore TSI, with the survey covering equipment condition, maintenance discipline, operator competence, and risk improvement evidence.
- Continuous condition monitoring evidence is required at competitive placement, with the insured documenting vibration monitoring, lubrication quality monitoring, thermography, oil analysis, and other condition-monitoring practices.
- Operator training documentation is required, with the insured demonstrating structured training programmes for operators on the highest-exposure machinery.
- Loss data sharing with the insurer is increasingly standard, with the insured providing detailed loss records over the past 5 to 10 years including near-miss events and minor losses below the policy deductible.
The accounts that approach the 2026 renewal cycle with documented evidence across these four threads experience materially better placement outcomes than the accounts that approach it as a transactional renewal. The 2026 process industries MBD market rewards demonstrated risk management and penalises gaps in the underwriting submission. Brokers placing process industries MBD covers should structure the placement submission to address the underwriter's expectations explicitly rather than treating the submission as a formal exercise.