Investigation of Structural Behavior of Deformed Bottom Plate on KMP. Kerapu III using Vacuum Testing at PT. Dutabahari Menara Line Dockyard

*Ignatius Aldo Kristanto  -  Vocational School, Department of Industry, Naval Architecture & Marine Engineering, Diponegoro University, Jl. Prof. Sudarto, SH, Tembalang, Semarang, Indonesia 50275, Indonesia
Zulfaidah Ariany  -  Vocational School, Department of Industry, Naval Architecture & Marine Engineering, Diponegoro University, Jl. Prof. Sudarto, SH, Tembalang, Semarang, Indonesia 50275, Indonesia
Jamal Jamal  -  Jurusan Teknik Perkapalan, Politeknik Negeri Bengkalis, Bengkalis, Indonesia, 28734, Indonesia

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Abstract

In the shipping industry, shipyards are common and widely encountered. The construction of new ships and ship repairs are routinely carried out here. The research was carried out during an internship at PT Dutabahari Menara Line Dockyard in Banjarmasin. This study discusses the obstacles to conducting a hull vacuum test. The test passes through a deformed plate (convex or concave), making the vacuum test tool impermeable. In the first test of the vacuum test process, which passed through the deformed plate, the pressure could not rise, only 0.10 bar. The standard pressure value is 0.20 – 0.30 bar, so leakage cannot be observed. The author is trying to find a solution to this problem. In the second test, with position adjustment and a slight push, the pressure can touch 0.19 bar. Basically, the vacuum test method is effective for use on parts of the ship that have an open space, such as the hull of a ship that has been welded due to repleting with a small volume. The work on the vacuum test at PT. DML Dockyard is carried out at the request of the ship owner. The author recommends finding the correct test position, placing the vacuum tool and the vessel plate, and using other methods for tightness testing.

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