Machinery Breakdown · insurance
Machinery Breakdown Insurance (MB) is a type of coverage within the engineering insurance system that specifically covers sudden and unforeseen damage to mechanical equipment caused by its own internal reasons. It differs from traditional Property All Risks (PAR), which typically excludes losses caused by mechanical or electrical breakdown. The core logic of MB insurance is: when an excavator, a tunnel boring machine, or a generator set suddenly becomes a total loss or requires major overhaul due to internal mechanical failure, electrical short circuit, operational error, centrifugal force tearing, or other causes, the insurance company bears the repair or replacement costs.
In the context of overseas engineering, MB insurance is almost always used in conjunction with Contractor's Plant & Machinery (CPM) or Erection All Risks (EAR). CPM primarily covers external risks (collision, overturning, theft) of mobile construction equipment (such as cranes, bulldozers, concrete pump trucks), while MB covers the "invisible ailments" inside these machines — bearing burnout, gear fracture, motor winding breakdown, hydraulic system pipe burst, etc.
A key distinction: MB insurance does not cover damage caused by normal wear and tear, gradual deterioration, corrosion, or inadequate maintenance. It only covers "sudden, unexpected" accidents. For example, if a diesel generator experiences piston ring wear due to prolonged overload operation, ultimately leading to cylinder scoring — this is gradual damage, and MB will not pay; but if the generator's stator winding is instantly burned out due to a voltage surge, MB will pay.
Under FIDIC contract conditions (especially the 2017 Yellow Book and Silver Book), contractors are typically required to insure "Engineering All Risks + Contractor's Plant & Machinery + Third Party Liability," and MB often appears as an endorsement to CPM or as a standalone policy. The World Bank's Standard Procurement Documents (SPN) under its procurement framework also explicitly require contractors to insure key equipment with MB or equivalent coverage.
| Element | Typical Content | Key Points for Overseas Engineering Practice |
|---|---|---|
| **Sum Insured** | Replacement Value or agreed value of equipment | New equipment: CIF price + customs duty + installation cost; used equipment: fair market value, usually requiring a third-party appraisal report. Avoid "under-insurance," otherwise claims will be paid on a proportional basis. |
| **Deductible** | USD 5,000~50,000 per occurrence, or 5%~10% of loss amount | Common deductibles for overseas projects: USD 10,000 per occurrence for mobile equipment, USD 25,000 per occurrence for fixed installation equipment. Higher deductibles can reduce premium rates by 15%~30%. |
| **Insurance Period** | Consistent with construction contract duration, typically 12~36 months | Can be renewed monthly or annually. If the project is delayed, extension must be applied for 30 days in advance, otherwise there will be a coverage gap. |
| **Premium Rate** | 0.15%~0.8% of sum insured per annum, depending on equipment type, site conditions, and claims history | TBMs and large cranes have higher rates (0.5%~0.8%); ordinary generators and air compressors 0.15%~0.3%. In the Middle East, rates increase by 20%~40% due to high temperatures and dust. |
| **Applicable Scenarios** | Tunnel boring, dam pouring, power plant installation, mining, port construction | Projects with dense equipment, high unit value, and severe consequences of breakdown must be insured. For example, an 8-meter diameter TBM worth RMB 120 million — a single main bearing failure could cost RMB 20 million to repair. |
| **Scope of Cover** | Mechanical breakdown, electrical failure, operational error, centrifugal force tearing, short circuit, boiler explosion | Can be extended to include: earthquake, flood, theft, malicious damage. But war, nuclear radiation, and normal wear and tear are excluded. |
| **Basis of Indemnity** | Repair cost or replacement cost, less deductible | Repairs require insurers' approved suppliers; replacement requires original invoices or depreciation calculation. Some policies specify "restoration to pre-loss condition" rather than brand-new replacement. |
Who initiates: Typically the contractor (EPC general contractor or construction subcontractor) of the overseas engineering project initiates the insurance. Owners sometimes require contractors to make MB a mandatory contract insurance and submit a copy of the policy within 30 days of winning the bid.
Where to apply:
How long:
What materials:
Claims process:
Case 1: Pakistan Hydropower Project — TBM Main Bearing Failure
In 2021, a Chinese state-owned enterprise was constructing a headrace tunnel in northern Pakistan using a German Herrenknecht TBM with a diameter of 8.5 meters. At 3.2 kilometers of boring, the main bearing experienced abnormal wear due to a sudden geological change (encountering a fault zone) and eventually seized. Repair required dismantling the TBM and replacing the main bearing, costing approximately RMB 18 million, with a 4-month construction delay.
The company had insured CPM + MB with a sum insured of RMB 120 million and a deductible of USD 50,000. The insurance company appointed Swiss Re engineers for on-site inspection and confirmed it was a "sudden mechanical failure" rather than normal wear. The final payout was RMB 16.5 million (after deducting the deductible and depreciation), but the construction delay loss (approximately RMB 20 million) was not within MB coverage and required separate ALOP insurance.
Lesson: MB only covers the equipment itself, not construction delays. Overseas projects should purchase MB together with ALOP.
Case 2: Saudi Arabia Petrochemical Installation Project — Generator Stator Burnout
In 2022, a Chinese petrochemical engineering company was installing a 50MW gas generator in Jubail Industrial Zone, Saudi Arabia. During the commissioning phase, a voltage regulator failure caused stator winding insulation breakdown, and the entire generator was burned out. Replacement cost was USD 3.2 million, with an 8-month repair period.
The company had insured EAR + MB with a sum insured of USD 35 million and a deductible of USD 25,000. The insurance company's investigation found that the voltage regulator was supplied by a subcontractor and had a design defect. The MB policy covered "electrical failure," and the final payout was USD 3.1 million. However, the insurance company subsequently pursued subrogation against the subcontractor, and the contractor had to cooperate by providing contracts and technical documents.
Lesson: After MB payout, the insurance company has the right of subrogation. Contractors should retain all subcontract documents and acceptance records to avoid being held liable themselves.
Case 3: Indonesia Mining Project — Excavator Hydraulic System Pipe Burst Causing Fire
In 2023, a Chinese mining company was using a Komatsu PC8000 excavator in Sulawesi, Indonesia. The main hydraulic line burst due to aging, and hydraulic oil sprayed onto the high-temperature exhaust pipe, causing a fire that destroyed the entire machine. The original value of the equipment was USD 8.5 million, and after 4 years of use, the depreciated value was USD 5.2 million.
The MB policy stipulated that "fire is a covered peril," but the insurance company argued that "hydraulic pipe aging constitutes normal wear and tear and was the root cause of the loss." The dispute lasted 6 months, and the loss adjuster ultimately determined: the pipe burst was sudden, and the fire was the direct cause of loss. The payout was USD 4.8 million.
Lesson: The boundary between "normal wear and tear" and "sudden failure" in MB clauses often leads to disputes. When insuring, the specific definition of "aging exclusion" should be clarified, and records of regular replacement of wear parts should be retained.
Contract Clause Pitfalls:
Legal Differences Pitfalls:
Exchange Rate Risk:
Cultural Differences Pitfalls:
| Solution | Scope of Cover | Applicable Scenarios | Advantages | Disadvantages | Typical Rate |
|---|---|---|---|---|---|
| **Standalone MB Policy** | Internal machinery/equipment failure only | Equipment-intensive, high unit value | Clear coverage, targeted claims | Requires separate insurance, higher cost | 0.2%~0.8% |
| **CPM + MB Endorsement** | External risks + internal failure | Primarily mobile construction equipment | One policy covers comprehensively | Deductible may be shared, payout cap limited | 0.3%~1.0% |
| **EAR + MB Endorsement** | Installation works + equipment failure | Power plants, petrochemical, factory installation | Seamless integration with engineering insurance | Complex clauses, easily confused | 0.15%~0.6% |
| **Property All Risks + MB Endorsement** | Property + machinery failure | Operational phase projects | Suitable for long-term operations | Machinery failure often excluded, requires endorsement extension | 0.1%~0.5% |
| **Self-Insurance + Commercial Reinsurance** | Retained portion of risk | Large SOEs, multiple projects | Lower premiums, flexible | Requires professional team, large capital occupation | Retain 20%~30% |
Selection Recommendations:
Q1: What is the difference between MB insurance and CPM insurance?
A: CPM covers external risks (collision, overturning, theft), MB covers internal failure (mechanical, electrical). The two are complementary and are usually purchased together.
Q2: Does MB insurance cover equipment damage caused by earthquake?
A: Standard MB does not cover earthquake. An "earthquake extension clause" is required, with rates increasing by 10%~20%.
Q3: How is the sum insured determined for used equipment under MB?
A: Based on fair market value, usually requiring a third-party appraisal. If insured at original value, claims will be paid on a depreciated basis.
Q4: What is the typical deductible for MB insurance?
A: Common for overseas engineering: USD 5,000~50,000 per occurrence, or 5%~10% of loss amount. Higher deductibles can reduce premium rates.
Q5: Does MB cover equipment damage caused by operational error?
A: Yes. Operational error is a covered peril, but it must be proven to be "sudden" rather than "intentional."
Q6: Does MB insurance cover construction delay losses?
A: No. Separate ALOP (Advance Loss of Profit) or DSU (Delay in Start-Up) insurance is required.
Q7: How does a Sinosure MB policy differ from international insurance companies?
A: Sinosure typically requires Chinese contractors to insure, with lower rates, but its overseas claims network may not be as efficient as Marsh/Aon.
Q8: Can MB insurance be purchased on a monthly basis?
A: Yes, but rates are higher. Short-term projects (<6 months) can be monthly; long-term projects are recommended to be annual.
Q9: During equipment repair, does MB cover the cost of renting replacement equipment?
A: Standard MB does not cover this. An "additional expenses clause" or "rental equipment expenses clause" is required.
Q10: How long does MB insurance claims settlement typically take?
A: From report to payment, typically 60~120 days. Complex cases (such as TBMs) may take 6 months.
Q11: Does MB insurance cover the freight cost of shipping equipment back to China for repair?
A: If the policy stipulates "global repair," it can be covered. Otherwise, only local repair costs are covered.
Q12: Under FIDIC contracts, is MB mandatory insurance?
A: FIDIC does not explicitly require MB, but owners often require MB to be included in CPM or insured separately. It depends on the Particular Conditions.
Q13: Can MB insurance premiums be included in contract costs?
A: Yes. Usually recorded under "insurance costs," borne by the owner or included in the contract price.
Q14: Does MB cover equipment damage caused by design defects?
A: Yes, but the insurance company will pursue subrogation against the designer. The contractor must cooperate by providing design contracts.
Q15: Can an MB policy be transferred to the owner?
A: Yes, but with the insurance company's consent. Typically after project completion, the policy can be converted to operational phase insurance.