FRP Tank Scrubber Design Optimization Using ASME RTP-1 Standard for Biogas Power Plant: A Case Study of The Tapioca Mill in West Tulang Bawang, Lampung

Abstract

The tapioca processing industry in Indonesia holds massive potential for generating renewable energy through Biogas Power Plants. However, the high toxic and corrosive Hydrogen Sulfide gas content necessitates a reliable purification system. This study aims to design and validate the mechanical integrity and process feasibility of a Fiber Reinforced Polymer (FRP) composite Biological Scrubber tank. The case study was conducted at a facility with a 2000 Nm³/h gas flow capacity, utilizing a tank measuring 3.6 m in diameter and 15 m in height. A comprehensive evaluation was performed using an analytical approach and Python-based computational simulations referencing the ASME RTP-1-2023 standard for FRP pressure vessels. The tank design was optimized using a step-tapered wall configuration to withstand combined hydrostatic, internal pressure (0.05 kg/cm²), wind (22.68 km/h), and Zone 2 seismic loads. Volumetric analysis indicates the reactor dimensions provide an Empty Bed Residence Time of 275 seconds and a superficial gas velocity of 0.055 m/s, optimally maintaining the metabolic stability of the desulfurizing bacteria. Mechanically, the step-tapered wall thickness optimization (20 mm at the base to 10.5 mm at the top) achieved 25% material savings while maintaining a Safety Factor > 10, ensuring the design fully meets strict operational safety standards.