Rigid Secondary Barrier (RSB): HRT-2001

Common issues

• Delamination or debonding of the composite laminate at panel edges or overlaps, often surfacing during cooldown-related mechanical stress
• Cracking of the resin/glass-fibre laminate surface, typically near penetrations, corners or stiffener attachments
• Loss of bond at the mastic/adhesive interface between the secondary barrier and hull insulation structure
• Moisture ingress behind the barrier compromising interbarrier space nitrogen inerting integrity
• Surface abrasion or puncture damage from tools or access equipment during tank entry
• Overlap seam failure at panel joints, usually detected through nitrogen leak-rate trending

Inspection checklist

• Visual inspection of accessible barrier surfaces for cracking, delamination, discoloration
• Review interbarrier space nitrogen pressure/leak-rate trend since last survey
• Check overlap seams and corner details for lifting or separation
• Inspect pipe/cable penetrations and sealing collars for integrity
• Review interbarrier space gas analysis (hydrocarbon detection) logs for anomalies
• Check for evidence of moisture or ice formation in the interbarrier space
• Confirm nitrogen purge system pressure and flow are within specification
• Cross-check maker's periodic survey report against actual accessible panel condition

Service intervals

Critical spares

• Maker-approved laminate repair kit (resin and reinforcement cloth) for local repairs
• Replacement mastic/adhesive compound for local re-bonding repairs
• Nitrogen purge system filters and pressure regulators as fitted
• Interbarrier space gas detection sensor elements
• Penetration seal/collar spares for pipe and cable entries

Safety

• Confined space entry into the interbarrier space requires full gas-free and oxygen verification
• Loss of nitrogen inerting can allow hydrocarbon accumulation in the interbarrier space - explosion/asphyxiation risk
• Cryogenic exposure risk if primary barrier integrity is also compromised
• Repair resin systems may carry inhalation/skin hazards - follow the maker's safety data sheet

Class survey

Category mismatch: this listing is filed under Steering Gear, but the product is a GTT-type membrane LNG cargo containment Rigid Secondary Barrier (RSB) panel system by Hankuk Carbon, not steering equipment - the notes above address the actual product. Class (DNV) surveys typically review interbarrier space nitrogen pressure/leak trend records, gas detection logs, and accessible panel condition at each special survey, with any laminate repair subject to approval under the ship's approved containment system manual.