Desain LNG Storage Untuk Sistem Bahan Bakar Pada LNG Fueled Harbour Tug 2 x 2500 HP

Nugroho, Eka Novianto (2021) Desain LNG Storage Untuk Sistem Bahan Bakar Pada LNG Fueled Harbour Tug 2 x 2500 HP. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Kapal harbour tug 2 x 2500 HP yang didesain menggunakan bahan bakar ganda/ dual fuel yang salah satunya menggunakan gas alam cair atau Liquefied Natural Gas (LNG). Liquefied Natural Gas memiliki tempat penyimpanan khusus yaitu LNG storage tank dan memiliki insulasi yang biasa di sebut cryogenic tank / pressure vessels. Tangki yang didesain untuk kapal harbour tug 2 x 2500 HP memiliki volume sebesar 78.05 m3 dan temperatur desain sebesar -1960 C serta tekanan desain sebesar 8 bar dan tekanan kerja sebesar 7 bar. LNG storage yang di desain memiliki 2 lapisan yaitu lapisan inner dan outer berjenis torispherical head. Material tangki yang digunakan pada LNG storage pada bagian inner yaitu berjenis Stainless Steel 304 memiliki ketebalan dinding 11 mm dan ketebalan head 17mm, dan pada bagian outer berjenis Carbon Steel memiliki ketebalan dinding 5 mm dan ketebalan head 5mm. Boil Off Gas (BOG) tangki yang terbentuk pada LNG storage memiliki Boil Off Rate (BOR) 0.12% perhari sebesar 0.0828 m3/hari. Komponen yang terdapat pada LNG storage yang digunakan adalah pressure built up (PBU), gas filter, safety valve, indikator tekanan (manometer), indikator level, transmitter tekanan, transmitter level, globe valve dan pressure regulator valve. Penyangga / saddle harus dalam bentuk yang sesuai, desain sederhana, dan ketebalan yang sesuai dengan ketebalan cangkang tangki dan diletakan dekat ujung tangki. Lokasi penempatan LNG storage juga harus disesuaikan dengan layout dari kapal harbour tug 2 x 2500 HP yang didesain yaitu berada di belakang dek akomodasi dengan penempatan membuju terhadap kapal dan memiliki batas setiap sisi minimal 0.8 m.
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Harbour tug 2 x 2500 HP which is designed to use dual fuel, one of which uses liquefied natural gas or Liquefied Natural Gas (LNG). Liquefied Natural Gas has a special storage area, namely LNG storage tank and has insulation which is commonly called cryogenic tank / pressure vessels. The tank designed for a harbor tug 2 x 2500 HP has a volume of 78.05 m3 and a design temperature of -1960 C and a design pressure of 8 bar and a working pressure of 7 bar. The LNG storage which is designed to have 2 layers, namely the inner and outer layers, is a torispherical head type. The tank material used in LNG storage on the inner side is stainless steel 304 which has a wall thickness of 11 mm and a head thickness of 17 mm, and on the outer part it is a type of Carbon Steel which has a wall thickness of 5 mm and a head thickness of 5 mm. The Boil Off Gas (BOG) tank formed in LNG storage has a Boil Off Rate (BOR) of 0.12% per day of 0.0828 m3 / day. The components contained in the LNG storage used are pressure built up (PBU), gas filter, safety valve, pressure indicator (manometer), level indicator, pressure transmitter, level transmitter, globe valve and pressure regulator valve. The saddle must be of a suitable shape, simple design, and a thickness that matches the thickness of the tank shell and positioned near the end of the tank. The location of the LNG storage placement must also be adjusted to the layout of the harbor tug 2 x 2500 HP which is designed, which is behind the accommodation deck with the placement towards the ship and has a minimum limit of 0.8 m on each side.

Item Type:	Thesis (Undergraduate)
Uncontrolled Keywords:	Kata kunci: Horbour tug, LNG, Dual Fuel, Pressure vessels, Boil off gas, Boil off rate Keywords : Horbour tug, LNG, Dual Fuel, Pressure vessels, Boil off gas, Boil off rate
Subjects:	V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering > VM297 Ships Designs and drawings
Divisions:	Faculty of Marine Technology (MARTECH) > Marine Engineering > 36202-(S1) Undergraduate Thesis
Depositing User:	Eka Novianto Nugroho
Date Deposited:	04 Mar 2021 00:53
Last Modified:	04 Mar 2021 00:53
URI:	http://repository.its.ac.id/id/eprint/83378

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