Analisis Kegagalan dan Metode Perbaikan Kebocoran pada Sistem Foam Bladder Tank: Studi Kasus Project SBI Plant Narogong

Abstract

The reliability of foam suppression systems is critical for mitigating Class B fire risks in chemical industrial facilities. This case study investigates an incident involving the discharge of foam solution through the Pressure Safety Valve (PSV) on the water inlet line of a Bladder Tank at Plant Narogong, which coincided with an internal hydrant pillar test. The study aims to identify the root cause of the leakage and formulate corrective actions in compliance with NFPA & FM Global standards. The investigation methodology included visual inspection, flushing tests, leak testing, and physical examination of the internal membrane. Inspection results confirmed that the Bladder membrane was intact, refuting initial suspicions of rubber material failure. Root cause analysis identified the incident was caused by back pressure phenomena due to valve misconfiguration during hydrant testing and internal corrosion in Carbon Steel pipes caused by foam residue. Corrective actions implemented included a pressure-balanced refilling procedure, pipeline flushing, and system design modification by installing a Check Valve after the proportioner. These measures proved effective in preventing backflow and maintaining the integrity of the fire protection system.