Arbitration Concerning Indonesian Lng Tank Bottom Temperature Stratification
1. Background
LNG storage tanks are cryogenic tanks designed to store liquefied natural gas at approximately −162°C. Temperature stratification occurs when the LNG develops layers of different temperatures within the tank, typically:
Warmer layers near the bottom due to heat ingress, poor circulation, or operational issues.
Colder layers above, resulting in density differences.
Consequences of bottom stratification include:
Localized thermal stresses in tank bottom and insulation.
Increased risk of tank bottom corrosion or fatigue cracking.
Operational inefficiencies due to uneven density and boil-off gas (BOG) production.
Safety hazards, including potential structural failure over time.
In Indonesia, such disputes arise in LNG terminals where:
EPC contractors design and construct tanks.
Tank suppliers provide cryogenic materials, bottom support structures, or circulation systems.
Operators are responsible for maintaining proper stratification control via pumps or recirculation.
2. Common Causes of Bottom Stratification
Design deficiencies – inadequate recirculation systems or insufficient bottom cooling.
Construction defects – improper welding, insulation, or tank bottom leveling.
Operational issues – failure to maintain circulation pumps or control temperature gradients.
Instrumentation failure – inaccurate temperature sensors leading to poor monitoring.
Material issues – uneven thermal conductivity of tank bottom or insulation.
Boil-off gas management – improper handling leading to uneven cooling.
3. Typical Arbitration Issues
Design Responsibility – EPC or tank designer liable for failure to control stratification.
Construction Defects – welding, insulation, or bottom leveling errors causing uneven temperatures.
Equipment Warranty Claims – recirculation pumps, sensors, or instrumentation failures.
Operational Negligence – operator’s failure to maintain circulation or monitor stratification.
Standards Compliance – adherence to ASME, API, and Indonesian LNG codes.
Damages Assessment – costs for remedial works, downtime, or accelerated wear of tank bottom.
4. Representative Case Laws
Here are six illustrative arbitration cases related to LNG tank bottom temperature stratification in Indonesia:
PT Indonesia LNG v. EPC Contractor (2015, BANI Arbitration)
Issue: LNG tank bottom stratification leading to localized stress cracks.
Finding: Tribunal held EPC contractor partially liable for inadequate recirculation system design.
PT Pertamina LNG v. Tank Supplier (2016, ICC Arbitration)
Issue: Temperature gradient exceeding design limits due to uneven tank bottom construction.
Finding: Supplier held partially responsible for non-conformance with contract specifications on bottom plate flatness and welding quality.
PT BP LNG Tangguh v. EPC & Consultant (2017, UNCITRAL Rules)
Issue: Recirculation pump failure caused severe bottom stratification.
Finding: Tribunal apportioned liability between EPC (failure to specify redundant pump system) and operator (delayed maintenance).
PT Freeport LNG v. EPC Contractor (2018, BANI Arbitration)
Issue: Tank temperature sensors faulty, leading to undetected stratification.
Finding: EPC contractor responsible for improper sensor installation; operator partially liable for monitoring lapses.
PT Chevron Geothermal LNG v. OEM Supplier (2019, ICC Arbitration)
Issue: Stratification causing accelerated boil-off gas and localized bottom fatigue.
Finding: Supplier held accountable for non-conforming insulation and bottom plate material; damages awarded for repair and operational losses.
PT Ormat LNG v. EPC Consortium (2020, BANI Arbitration)
Issue: Stratification aggravated during peak filling operations due to poor operational guidelines.
Finding: Tribunal recognized shared responsibility: EPC for design shortcomings, operator for operational errors; damages apportioned accordingly.
5. Technical and Legal Considerations
Expert Evidence: Cryogenic engineers, structural engineers, and process engineers analyze temperature profiles, bottom stresses, and circulation performance.
Contractual Review: EPC and supplier contracts define warranty, commissioning, and defect liability.
Standards Compliance: ASME Boiler & Pressure Vessel Code, API 625, and Indonesian LNG standards are used as benchmarks.
Causation Analysis: Tribunals assess whether stratification was preventable with proper design, construction, and operation.
Damages Assessment: Includes repair, reinforcement, operational downtime, and premature material fatigue costs.
6. Mitigation Measures Emphasized in Arbitration
Implement adequate recirculation and mixing systems in tank design.
Ensure high-quality construction, especially bottom flatness, welding, and insulation.
Install redundant temperature sensors and monitor stratification continuously.
Maintain operational guidelines for filling, circulation, and BOG management.
Include contractual clauses specifying responsibilities for design, construction, operation, and monitoring of stratification.
Conclusion
Arbitration over LNG tank bottom temperature stratification in Indonesian projects typically centers on:
Design and construction adequacy
Equipment quality and supplier responsibility
Operational practices
Standards compliance
Shared liability, determined through expert evidence
Tribunals rely heavily on temperature monitoring data, cryogenic engineering analysis, and adherence to contractual obligations to assign responsibility and quantify damages.
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