PERANCANGAN PRESSURE VESSEL DENGAN BEBAN BERAT EKSTERNAL, STUDI KASUS: ELEKTROSTATIC DESALTER VESSEL DENGAN BEBAN TRANSFORMATOR 100 KVA

Zulkarnaen, Maulana Dwi (2026) PERANCANGAN PRESSURE VESSEL DENGAN BEBAN BERAT EKSTERNAL, STUDI KASUS: ELEKTROSTATIC DESALTER VESSEL DENGAN BEBAN TRANSFORMATOR 100 KVA. Diploma thesis, UNSPECIFIED.

Text 0822040017 - Maulana Dwi Zulkarnaen - Perancangan _i_ Pressure Vessel __i_ dengan Beban Berat Eksternal, Studi Kasus_ Electrostatic Desalter _i_ Vessel __i_ dengan Beban Transformator 100 kVA.pdf Download (3MB)

Abstract

The revamping of the electrostatic desalter system in the Crude Distillation Unit involved the installation of a 100 kVA transformer above the C-201-07B pressure vessel. The transformer weighs 6,350 lb, or approximately 2,880 kg, and therefore generates an additional external load on the vessel shell, head, support structure, and nozzle areas. This additional load may alter the stress distribution and potentially cause structural failure due to plastic collapse. This study aims to develop an accurate three-dimensional model of the C-201-07B pressure vessel, evaluate its stress distribution under the combined effects of internal pressure, fluid weight, vessel self weight, and transformer weight, analysis stress concentration in the nozzle area connected to the transformer, and validate the stability of the simulation results through a Grid Independence Test. Structural integrity was evaluated in accordance with ASME Section VIII Division 2 Part 5 using elastic stress analysis, stress linearization, and stress classification lines. The analysis was divided into two models: Model 1 evaluated the global structural response of the vessel under transformer loading, while Model 2 evaluated the local structural response at the nozzle to vessel junction. The convergence test showed that Model 1 achieved mesh independence at a mesh size of 30 mm with an error of 0.04%, while Model 2 converged at a mesh size of 25 mm with an error of 0.05%. Model 1 produced a maximum von Mises stress of 158.2 MPa in the knuckle/head region, with the most critical condition occurring at SCL B_002, where the linearized stress reached 154.88 MPa against an allowable limit of 228 MPa. Model 2 produced a maximum von Mises stress of 581.21 MPa at the nozzle-to-vessel junction. However, following stress linearization, all Stress Classification Lines in both models satisfied the protection-against-plastic-collapse criteria. Therefore, the C- 201-07B pressure vessel is considered structurally capable of withstanding the combined operating loads and the external load generated by the 100 kVA transformer based on the applied evaluation criteria.

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