The Calcutta High Court has reaffirmed that arbitral tribunals cannot substitute expert opinion or personal knowledge for admissible evidence, nor can they disregard explicit contractual liabilities. This judgment reinforces the narrow scope of judicial intervention under Section 34 of the Arbitration and Conciliation Act, 1996, while emphasizing that contractual obligations must prevail over speculative engineering theories.
Background & Facts
The Dispute
The dispute arose from a catastrophic water ingress incident during tunneling operations for the Kolkata Metro Rail project on August 31, 2019. The incident caused surface damage and triggered third-party claims. The appellant, ITD-ITD CEM Joint Venture (contractor), initiated arbitration against the respondent, Kolkata Metro Rail Corporation Limited (employer), seeking reimbursement for liabilities incurred. The core issue was whether the contractor or the employer bore responsibility for the incident under the contract.
Procedural History
- August 6, 2023: Arbitral Tribunal awarded in favor of the contractor, holding the employer liable for third-party damages.
- October 31, 2025: Calcutta High Court (Single Judge) set aside the award under Section 34 of the Arbitration and Conciliation Act, 1996.
- February 12, 2026: Appeal heard before a Division Bench under Section 37.
The Parties' Positions
- Appellant (Contractor): Argued the award was based on plausible engineering reasoning and that the tribunal properly evaluated conflicting expert reports. Relied on Ssangyong, Ramesh Kumar Jain, and OPG Power Generation to assert that courts cannot substitute their view for a plausible arbitral finding.
- Respondent (Employer): Contended the tribunal ignored vital evidence (post-retrieval reports from IIT Madras and IIEST Shibpur), applied double standards in evaluating reports, and misapplied contractual clauses on liability.
Relief Sought
The appellant sought to set aside the Single Judge’s order and restore the arbitral award. The respondent sought affirmation of the setting aside of the award on grounds of patent illegality and violation of natural justice.
The Legal Issue
The central question was whether an arbitral tribunal’s reliance on its members’ personal engineering expertise to discard expert reports - without objective analysis - constitutes patent illegality under Section 34(2)(b)(ii), and whether ignoring explicit contractual provisions on third-party liability renders an award contrary to public policy.
Arguments Presented
For the Appellant
The appellant relied on P.R. Shah Shares and Stock Brokers to argue that arbitrators may use general industry knowledge, and that the tribunal’s rejection of IIT Madras’s report was based on legitimate skepticism of SPT values in saturated soils. It contended that the tribunal’s findings were plausible and that the Single Judge erred by reappreciating evidence. It cited Dyna Technologies and Konkan Railway to assert that courts cannot interfere merely because an alternative view exists.
For the Respondent
The respondent argued that the tribunal’s dismissal of post-retrieval reports was arbitrary and based on the timing of submission, not their merit. It emphasized that the reports were prepared only after the TBM was recovered - after 900 days - and that the tribunal ignored the contract’s explicit allocation of liability under Clauses 4.1, 4.9, 14.5, and 3.4 of the GCC. It relied on Ssangyong and OPG Power Generation to show that ignoring contract terms constitutes patent illegality.
The Court's Analysis
The Court examined whether the Arbitral Tribunal’s reasoning fell within the permissible bounds of arbitral discretion or crossed into patent illegality under Section 34(2)(b)(ii). It held that while arbitrators may possess technical expertise, they cannot use it to override documented evidence.
"The moment personal knowledge comes in and replaces material evidence presented by the parties, the objective consideration of the body of evidence... are excluded."
The Court found that the tribunal’s dismissal of IIT Madras’s report was not based on any scientific rebuttal but on the arbitrators’ subjective belief that SPT values were misleading - a view unsupported by evidence. This amounted to an impermissible substitution of personal opinion for evidentiary analysis.
Further, the tribunal ignored critical contractual provisions. Clause 4.1 of the GCC placed full risk on the contractor for site safety, and Clause 3.4 explicitly barred any relief from liability due to the engineer’s acts or omissions. The tribunal’s conclusion that the employer bore third-party liability directly contradicted these unambiguous terms.
"An Arbitral Tribunal must decide in accordance with the terms of the contract. In a case where an Arbitral Tribunal passes an award against the terms of the contract, the award would be patently illegal."
The Court also found a clear violation of Section 18 of the Act, as the tribunal accepted pre-retrieval reports from the contractor while rejecting post-retrieval reports from the employer without justification, despite both being prepared by qualified experts. This double standard deprived the respondent of equal treatment.
The Court distinguished P.R. Shah by noting that the tribunal here did not rely on general market practice but on specific, unsubstantiated technical opinions that contradicted the record. The award was not merely flawed - it was irrational, unsupported by evidence, and in direct conflict with the contract.
The Verdict
The appellant’s appeal was dismissed. The Calcutta High Court upheld the Single Judge’s order setting aside the arbitral award. The Court held that an arbitral award based on personal expertise over evidence and in direct contravention of explicit contractual terms constitutes patent illegality under Section 34(2)(b)(ii), and is liable to be set aside.
What This Means For Similar Cases
Arbitrators Cannot Substitute Expert Opinion for Evidence
- Practitioners must challenge awards where arbitrators dismiss expert reports based on their own technical views without referencing the record.
- Evidence must be evaluated on its merits, not on the arbitrator’s pedigree or assumed authority.
- Any dismissal of evidence must be accompanied by reasoned, objective analysis - not assumptions.
Contractual Terms Override Arbitral Speculation
- Arbitral tribunals are bound by the contract’s express terms; they cannot rewrite liability allocations.
- Clauses allocating risk to the contractor (e.g., for third-party damage) cannot be ignored even if the incident appears unforeseen.
- Parties must ensure contractual provisions are clearly pleaded and referenced in submissions.
Post-Dispute Expert Reports Are Admissible
- Reports prepared after arbitration begins are not inherently inadmissible.
- Delay in submission is irrelevant if caused by physical constraints (e.g., retrieval of equipment).
- Both parties’ expert reports must be evaluated on equal footing; discriminatory treatment violates Section 18.
