Evaluasi Umur Layanan Pipa Konduit Baja Intake Bendungan Cibeet Berdasarkan Interaksi Pembebanan Hidraulik dan Degradasi Struktur Akibat Korosi

Winanda, Refaldi Tjahya (2026) Evaluasi Umur Layanan Pipa Konduit Baja Intake Bendungan Cibeet Berdasarkan Interaksi Pembebanan Hidraulik dan Degradasi Struktur Akibat Korosi. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Bangunan pengambilan (intake) pada Bendungan Cibeet merupakan bangunan pengambilan yang berfungsi memenuhi kebutuhan irigasi, air baku, dan Pembangkit Listrik Tenaga Mikrohidro (PLTMH). Pengoperasian intake mengacu pada pola operasi waduk dengan debit pengeluaran minimum sebesar 4,24 m³/dt dan terbesar 7,55 m³/dt. Pada kondisi tertentu bangunan ntake juga dapat difungsikan sebagai salah satu bangunan pengeluaran ketika elevasi waduk mencapai MAB elevasi 82,42 +m, dengan kemampuan pengeluaran debit sebesar 21,18 m³/dt. Dengan intake berupa pipa baja konduit memungkinkan terjadinya laju korosi yang menyebabkan degradasi ketebalan sehingga memengaruhi perubahan geometri pipa, kondisi hidrolik, kapasitas struktur, dan umur layan. Proyek akhir ini bertujuan menganalisis pengaruh laju korosi berdasarkan parameter Total Dissolved Solids (TDS) terhadap umur layan pipa konduit baja melalui evaluasi tegangan melingkar (hoop stress) dan tegangan tekuk (buckling). Hasil analisis menunjukkan bahwa nilai TDS Sungai Cibeet sebesar 110,04 mg/L menghasilkan prediksi laju korosi sebesar 0,205 mm/tahun. Berdasarkan evaluasi kapasitas struktur pada pipa baja konduit berjenis WSSP melalui analisis tegangan melingkar dan tegangan tekuk didapatkan ketebalan optimum 0.75 inci (19,05 mm). Kondisi paling kritis terjadi pada segmen upstream pipa saat muka air waduk mencapai MAB dengan pipa konduit berada dalam kondisi kosong. Estimasi umur layanan pada kondisi tersebut mencapai 47 tahun akibat tegangan tekuk dengan sisa ketebalan mencapai 9,47 mm. Sementara itu, evaluasi tegangan melingkar menghasilkan estimasi umur layanan rata-rata terendah dari setiap segmen sebesar 77 tahun dengan sisa ketebalan 3,24 mm.
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The intake structure of Cibeet Dam functions as a water intake facility to supply irrigation, raw water, and Micro Hydropower Plant (MHP) demands. The intake is operated according to the reservoir operating rule, with discharge ranging from a minimum of 4.24 m³/s to a maximum of 7.55 m³/s. Under certain conditions, the intake also serves as an outlet structure when the reservoir reaches the Maximum Water Level (MWL) at an elevation of +82.42 m, with a discharge capacity of 21.18 m³/s. The use of a steel conduit pipe (steel liner) as the conveyance system makes it susceptible to corrosion, resulting in wall thickness degradation that affects pipe geometry, hydraulic performance, structural capacity, and service life. This study aims to analyze the effect of corrosion rate, estimated from the Total Dissolved Solids (TDS) water quality parameter, on the service life of the steel conduit pipe through evaluations of hoop stress and buckling. The analysis results indicate that a TDS concentration of 110.04 mg/L in the Cibeet River corresponds to an average corrosion rate of 0.205 mm/year. Structural capacity evaluation of the WSSP steel conduit pipe based on hoop stress and buckling analyses identified an optimum wall thickness of 0.75 inches (19.05 mm). The most critical condition occurred at the upstream segment when the reservoir water level reached the Maximum Water Level (MWL) while the conduit pipe was empty. Under this condition, the predicted service life was 47 years based on buckling analysis, corresponding to a remaining wall thickness of 9.47 mm. In contrast, the hoop stress evaluation predicted a minimum average service life of 77 years across all pipe segments, with a remaining wall thickness of 3.24 mm.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Pipa konduit baja, Laju korosi, Tegangan melingkar, Tegangan tekuk, Umur layan,Steel conduit pipe, Corrosion rate, Hoop stress, Buckling stress, Service life
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA645 Structural analysis (Engineering) T Technology > TA Engineering (General). Civil engineering (General) > TA660.P55 Underground pipeline design, construction and management T Technology > TC Hydraulic engineering. Ocean engineering > TC167 Dams, reservoirs
Divisions:	Faculty of Vocational > 22301-Civil Infrastructure Engineering (D4)
Depositing User:	Refaldi Tjahya Winanda
Date Deposited:	03 Aug 2026 06:41
Last Modified:	03 Aug 2026 06:41
URI:	http://repository.its.ac.id/id/eprint/142326

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