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2021/03
Taiwan CTCI and KHI Consortium Reached Storage Tank Roof Air-Raising Milestone at CPC’s Third LNG Receiving Terminal
On March 11, 2021, CTCI Corporation (CTCI) and consortium partner Kawasaki Heavy Industries Company (KHI) successfully completed tank roof air-raising for the first LNG storage tank, with a capacity of 160,000 m3, at CPC Corporation’s (CPC) third liquefied natural gas (LNG) receiving terminal. This marks a major milestone of the LNG storage tank construction in this project. By accomplishing this task, CTCI gained further experience and established track record in the global LNG engineering business field.
Located in Guanyin District, Taoyuan, this is the third LNG receiving terminal invested and constructed by CPC. The scope of work includes two 160,000 m3, above-ground full containment LNG tanks with double domed roof. After forming a complete airtight space within the domed roof and the pre-stressed concrete outer wall, air is infused to create additional air pressure inside. The air pressure difference then helps raise the roof, which is 78.2 meters in diameter and weighs more than 1,000 tons, to a height of 30 meters. To avoid collision between the tank roof structure and the PC outer wall, the position tolerance and tank roof leveling must be strictly controlled (with a tolerated margin of only a few centimeters). Thanks to the rich experience, solid technology and collaboration of the project team, this arduous task was successfully completed.
The successful raising of the LNG tank roof allows the project to enter the next stage of implementation. By the time the terminal is commissioned and started-up in early 2023, the first storage tank will become in operation, helping stabilize domestic energy supply.
Pictured here are two above-ground full containment storage tanks with double domed roofs, with a capacity of 160,000 m3. The roofs are lifted by using a technique called "air-raising," After forming a complete airtight space within the domed roof and the pre-stressed concrete outer wall, air is infused to create additional air pressure inside. Then the air pressure difference is utilized to raise the roof from the ground to the design height.
T-101 tank roof is air-raised to around 2 meters high. It is necessary to strictly control the inclination and rotation offset of the tank roof during the lifting process, with tolerance of only a few centimeters. The tank roof can be adjusted to ensure roof is level during the lifting process by using 10 groups of 20 balanced wires.
The tank roof has a diameter of 78.2 meters and weighs more than 1,000 tons. Rising at a rate of about 10 centimeters per minute, it took nearly 5 hours to smoothly rise to a height of 30 meters.
Roof air-raising successfully completed. CPC and CTCI chief executives took a group photo on the tank roof.
From left: Huang Rongyu, Director of LPCD at CPC ; Lee Shunqin, Chairman of CPC; Michael Yang, Chairman of CTCI; David Chung, Deputy CEO of HBO at CTCI; Li Wenyi, Director of Construction at CPC; and Michael Lee, Tank Project Manager at CTCI.
