In-depth | LNG
Lindgren says that both C and B-type
tanks are fairly safe when it comes to sloshing, compared to the membrane type of tank. However, he adds that this is still relative of the size of tank compares to ship size. Te safety requirements for B-type tanks are stricter than that of C-type, where there is a regulation for the possibility of leakage. Lingren notes that this type of tank has been fitted with an explosion safe area outside of the tank. Okazaki also adds: “Te design of the tanks limits the liquid motion inside, reducing the chance of sloshing.”
The insulation system of pre-fabricated rigid PUF panels and cushion joints
Hull and tank section Currently, IHI have installed this type
of tank on three vessels and believe that the tank design has potential in future for other LNG fuelled vessels, highlighting large container ships. “I am quite sure that we see more of these
tanks in the future,” comments Lindgren. “With future ECA areas coming into play;
LNG is politically driven with regulations pushing to develop this new technology.” IHI says openly that this technology will
not be cheap and is more suited for larger vessels as for smaller vessels this option would be expensive. However, it believes that the advantages of the tank outweigh the disadvantages. NA
5% Fuel Saving Experiences around 2,000 ships. Adopted by more than 200 owners and operators.
The PBCF has been developed and commercialized in 1987 by the corporate group centered in Mitsui O.S.K. Lines, Ltd..
PBCF is the originated device to be focused in the recovery of energy from the flow out energy in propeller hub vortex.
Its fundamental mechanism and effects have been repeatedly verified through numerous series of model tank tests and actual ship measurements from the first stage of the development.
The 5% energy saving effect has been presented on numerous occasions at academic association meetings both in Japan and overseas, and this has been well accepted both in Japan and overseas.
Basic principle of PBCF effect As the flows accelerated down after the blade trailing edges are blocked and rectified to a straight ship-stream by the fins of the PBCF, the hub vortex will be eliminated.
without PBCF with PBCF
PBCF has been kept contributing energy saving for the vessels in worldwide, and is an global environment-friendly technology.
hub vortex E-mail：
pbcf@motech.co.jp URL：
http://pbcf.motech.co.jp/ 54 The Naval Architect September 2012
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