Meaning
Progressive cost reduction mechanism calculated across extended port detention periods to reflect diminishing daily holding surcharges in specialized shipping contracts. The application of demurrage decays reduces per-day container or vessel holding fees after specific duration thresholds are breached in maritime transport operations. Terminal operators and ocean carriers incorporate these tiered schedules to manage long-term container yard congestion in Chinese commercial ports.
The rule limits escalating penalty accumulation when customs clearances or quarantine holds delay cargo clearance beyond standard laytime allowances.
Surcharge Structure
Tiered rate schedules lower the marginal daily penalty when detention times extend into secondary and tertiary billing windows. Contracting demurrage decays requires explicit contractual definitions within charter party agreements or master bill of lading terms. Ocean carriers adjust daily assessments based on verified vessel log entries and port authority timestamp records.
Operational Boundary
Rate reductions terminate when total storage durations exceed maximum contract caps or when cargo faces official administrative confiscation. Relying on demurrage decays does not eliminate underlying customs inspection fees or port terminal storage tariffs. Terminal operators enforce separate storage tariffs independent of carrier penalty adjustments.
Cost Allocation
Maritime freight auditors verify fee calculations against daily terminal interchange receipts and carrier rate sheets. Calculating demurrage decays provides clear financial allocation rules between cargo importers and freight forwarders during prolonged administrative holds. Dispute settlements follow maritime arbitration rules in designated port jurisdictions.
