QUICK ASSESSMENT METHOD FOR CANISTER STRUCTURAL DESIGN OF INA-CBT

Abstract

Canister in the Ina-CBT (Indonesian Cable-Based Tsunameter) system is a structure to protect underwater sensor system. Canister and sensor system form the OBU (Ocean Bottom Unit) system. This OBU is connected by land via submarine cable. This canister is used to protect the sensor system from the underwater leakage and water pressure. Because the location of the OBU can usually reach a depth of thousands of meters in the sea, the water pressure on the OBU becomes very large. As an illustration, for a depth of 1000 meters, the pressure on the canister wall is 1 ton per square meter. For this reason, a strong canister structure is needed to withstand water pressure without damage. The strength of this structure can be analyzed using a structural analysis program. However, if a change in pressure and dimension is needed, it needs to be re-modeled to determine its strength which requires time. Therefore a study of a method to determine quickly the strength of the canister is carried out. The results show that this method is very useful to quickly determine the dimensions and initial weight of the canister due to the external pressure load of sea water. For example, with SS 316 L stainless steel material and a canister inner radius of 100 mm, the canister is suitable for further design only for external pressures up to 30 MPa. For pressures above 30 MPa, the thickness and weight of the canisters are becoming impractical for onboard handling.

 Keywords: canister, ina-cbt, strength, water pressure, quick method.

https://doi.org/10.29122/jstmb.v15i2.4423
PDF

References

Ansys. 2020. Next-Generation Pervasive Engineering Simulation. [terhubung berkala]. https://www.ansys.com/ [1 Juli 2020].

ASTM International. 2015. ASTM A240 Grade 316L Heat-Treated. 116p.

Badan Standardisasi Nasional. 2012. SNI 7840-2012 Baja Tahan Karat (Stainless Steel) Canai Dingin Bentuk Lembaran dan Gulungan (Bj TK D). 18p.

BPPT. 2020a. Laporan Desk Top Study Indonesia Cable Based Tsunameter (Ina CBT) Labuan Bajo, Nusa Tenggara Timur. 110p.

BPPT. 2020b. Laporan Detail Engineering Design (DED). Indonesia Cable Based Tsunameter (Ina CBT) Labuan Bajo, Nusa Tenggara Timur. 98p.

BPPT. 2019a. Grand Design Ina-TEWS BPPT 2019-2024. Badan Pengkajian dan Penerapan Teknologi. Tahun Anggaran 2019.

BPPT. 2019b. Laporan Pra-Feasibility Study Program Ina-TEWS. Badan Pengkajian dan Penerapan Teknologi. Tahun Anggaran 2019.

Computers and Structures, Inc. 2014. SAP2000 Linear and Nonlinear Static and Dynamic Analysis and Design of Three-Dimensional Structures, Advanced 14.0.0.

KemenkumHAM. 2019. Penguatan dan Pengembangan Sistem Informasi Gempa Bumi dan Peringatan Dini Tsunami. Kementerian Hukum dan Hak Asasi Manusia. Lembaran Negara Republik Indonesia tahun 2019 Nomor 266.

The Engineering Toolbox. 2020. Stress in Thick-Walled Cylinders. [terhubung berkala]. https://www.engineeringtoolbox.com/stress-thick-walled-tube-d_949.html [8 Juli 2020]

Creative Commons License

This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

Copyright (c) 2020 Array