1. Introduction

Auxiliary boilers are critical components of thermal, combined-cycle, nuclear, biomass, and industrial captive power plants. Unlike the main steam generator, an auxiliary boiler supplies essential low-pressure or medium-pressure steam required for:

• turbine gland sealing;
• fuel heating;
• deaerator operation;
• boiler feed-water heating;
• soot blowing;
• start-up and shutdown operations;
• chemical processes within integrated plants.

A malfunction of an auxiliary boiler can interrupt the entire power-generation cycle even when the main generating equipment is technically available. Such failures frequently generate arbitration disputes between:

1. Plant owners and EPC contractors;
2. Owners and boiler manufacturers;
3. Operators and maintenance contractors;
4. Insurance companies and equipment suppliers.

Common allegations include:

• defective boiler design;
• inadequate heat-transfer calculations;
• improper material selection;
• tube leakage;
• refractory failure;
• burner malfunction;
• control-system failure;
• poor commissioning;
• failure to meet guaranteed performance parameters;
• delayed rectification.

Power plant boiler disputes are generally resolved through EPC contracts, equipment supply agreements, operation and maintenance agreements, and arbitration clauses. Indian arbitration matters involving boiler packages and balance-of-plant works demonstrate the recurring importance of technical evidence, performance guarantees, and contractual allocation of risk.

2. Nature of Auxiliary Boiler Malfunction Claims

A. Design Defect Claims

The owner may allege that the auxiliary boiler was incapable of achieving:

• required steam pressure;
• required steam temperature;
• fuel flexibility;
• load-following capability;
• efficiency guarantees.

Typical arguments:

Owner's position:

• contractor failed to perform proper engineering;
• boiler calculations were inaccurate;
• design did not account for actual operating conditions.

Contractor's defence:

• operating conditions differed from contractual assumptions;
• fuel quality was outside specifications;
• improper operation caused failure.

B. Manufacturing Defect Claims

Typical failures include:

1. Boiler Tube Failures

Causes:

• metallurgical defects;
• corrosion;
• overheating;
• welding defects;
• poor quality control.

Claims involve:

• replacement costs;
• production loss;
• liquidated damages;
• consequential losses.

2. Burner and Combustion System Failure

Disputes arise where:

• flame instability occurs;
• fuel-air ratio is incorrect;
• emissions exceed limits;
• boiler trips repeatedly.

3. Control and Instrumentation Failure

Modern auxiliary boilers depend on:

• PLC systems;
• DCS integration;
• automatic trip mechanisms.

Failure of sensors or control logic may cause:

• unsafe pressure rise;
• shutdown;
• inability to synchronize plant operation.

3. Contractual Issues in Arbitration

A. Performance Guarantee Disputes

Most EPC contracts contain guarantees relating to:

• steam output;
• efficiency;
• availability;
• reliability.

Failure may trigger:

• performance liquidated damages;
• corrective obligations;
• replacement obligations.

B. Limitation of Liability Clauses

Suppliers often rely on clauses excluding:

• loss of production;
• loss of profit;
• indirect damages.

Owners argue that:

• gross negligence;
• fundamental breach;
• failure of essential equipment

should prevent reliance on exclusions.

C. Force Majeure Defence

Contractors sometimes argue malfunction resulted from:

• abnormal fuel quality;
• unexpected corrosion;
• external grid disturbances;
• extreme environmental conditions.

Tribunals usually examine whether the event was:

1. unforeseeable;
2. unavoidable;
3. beyond contractual control.

4. Technical Evidence Before Arbitration Tribunal

Auxiliary boiler arbitration usually requires:

Expert Evidence

Experts analyse:

• failure mechanism;
• metallurgical reports;
• vibration records;
• pressure history;
• operating logs;
• maintenance records.

Root Cause Analysis (RCA)

Tribunals commonly examine:

Design Cause

Was the boiler incorrectly designed?

Manufacturing Cause

Was defective equipment supplied?

Installation Cause

Was commissioning defective?

Operational Cause

Was the boiler misused?

5. Damages Claimed

Common claims include:

Direct Repair Costs

• replacement tubes;
• burner repairs;
• refractory rebuilding;
• control system replacement.

Delay Damages

Including:

• delayed commissioning;
• inability to achieve commercial operation date.

Loss of Generation

Owners may claim:

• lost electricity sales;
• additional fuel expenses;
• replacement power purchase costs.

6. Important Case Laws

1. Thermax Limited v. Arasmeta Captive Power Co. Pvt. Ltd. (Andhra Pradesh High Court, 2007)

Facts

Thermax supplied boiler and balance-of-plant equipment for a captive power project. Disputes arose concerning performance issues and contractual obligations under a boiler supply agreement.

Issue

Whether disputes relating to boiler equipment supply and alleged performance failures were arbitrable.

Decision

The Court recognized that disputes arising from boiler and balance-of-plant contracts could be referred to arbitration according to the contractual arbitration mechanism.

Principle

Technical disputes regarding power plant equipment, including boiler systems, are generally arbitrable unless excluded by law.

Relevance

Applies directly to auxiliary boiler malfunction disputes involving:

• equipment suppliers;
• EPC contractors;
• captive power owners.

2. M/s Power Mech Projects Ltd. v. M/s Doosan Power Systems India Pvt. Ltd. (Delhi High Court, 2024)

Facts

The dispute concerned boiler works for a large thermal power project, including erection, testing, and commissioning of boiler-related systems.

Issue

Extension of arbitral proceedings concerning contractual disputes in boiler works.

Decision

The Court dealt with continuation of arbitration concerning major power plant boiler package works.

Principle

Large-scale power plant boiler disputes require arbitration mechanisms capable of handling complex technical evidence and lengthy contractual claims.

Relevance

Relevant to disputes involving:

• auxiliary boiler erection;
• commissioning delays;
• testing failures;
• contractor responsibility.

3. Insurance Company of North America v. ABB Power Generation Inc., 112 F.3d 70 (2nd Cir. 1997)

Facts

A power plant suffered equipment failure resulting in shutdown and major repair costs. Insurance companies sought recovery from the equipment supplier.

Issue

Whether equipment failure claims arising from power plant defects could be submitted to arbitration.

Decision

The court examined contractual arbitration obligations concerning equipment failure claims.

Principle

Power plant equipment failures can create complex contractual and tort-related disputes requiring arbitration analysis.

Relevance

Useful for auxiliary boiler failures involving:

• insurers;
• manufacturers;
• EPC contractors.

4. Associate Builders v. Delhi Development Authority (Supreme Court of India, 2014)

Facts

The case concerned challenges to arbitral awards under Indian arbitration law.

Principle

Courts should not interfere with arbitral findings merely because another interpretation is possible.

Application to Boiler Arbitration

Where an arbitral tribunal determines:

• technical responsibility;
• expert evidence;
• contractual interpretation,

courts generally respect those findings unless they violate fundamental legal principles.

Importance

Supports finality of awards in complex engineering disputes.

5. ONGC Ltd. v. Saw Pipes Ltd. (Supreme Court of India, 2003)

Facts

The dispute involved contractual damages and liquidated damages.

Principle

Contractual damages provisions may be enforced where parties have agreed upon compensation mechanisms.

Application

In auxiliary boiler disputes:

If an EPC contract specifies:

• commissioning delay damages;
• performance shortfall penalties;

tribunals may enforce those provisions depending on evidence.

6. McDermott International Inc. v. Burn Standard Co. Ltd. (Supreme Court of India, 2006)

Facts

The dispute involved a large engineering and construction contract.

Principle

Arbitrators are the final judges of technical and contractual disputes. Courts should not reassess technical conclusions.

Application

In boiler malfunction arbitration:

The tribunal may decide:

• whether failure arose from design;
• whether contractor breached guarantees;
• whether damages are payable.

7. Delhi Airport Metro Express Pvt. Ltd. v. DMRC (Supreme Court of India, 2022)

Principle

An arbitral award cannot be interfered with merely because the court disagrees with the tribunal's interpretation.

Application

Useful where arbitration concerns:

• engineering defects;
• reliability failures;
• allocation of technical risk.

7. Typical Arbitration Issues Before Tribunal

8. Tribunal's Approach in Deciding Liability

A tribunal generally determines:

Step 1: Contract Interpretation

• scope of supply;
• warranty clauses;
• performance guarantees.

Step 2: Technical Responsibility

Through:

• expert reports;
• inspection records;
• operating data.

Step 3: Causation

The claimant must establish:

• defect;
• breach;
• resulting damage.

Step 4: Damages Assessment

The tribunal evaluates:

• repair expenses;
• delay costs;
• contractual penalties.

9. Conclusion

Arbitration arising from auxiliary boiler malfunction in power plants represents a classic category of engineering failure disputes. The central questions are not merely whether the boiler failed, but:

• who controlled the design risk;
• whether performance guarantees were achieved;
• whether maintenance or operation contributed to failure;
• whether damages are recoverable under the contract.

The most important lessons from arbitration jurisprudence are:

1. Boiler and power plant equipment disputes are generally arbitrable.
2. Technical evidence is decisive.
3. EPC risk allocation clauses determine liability.
4. Performance guarantees must be interpreted strictly.
5. Tribunals receive wide authority to determine engineering responsibility.