The 8th Maritim Industry Expo had just been held at Plasa Tunjungan III Surabaya on 5-8 of June 2008. But it doesn’t mean that all of the creativity in ocean engineering world would be remain untraced. As its proof, the Windcur Energy had been introduced by Ir. Arief Soeroso, M.Sc, one of the lecturer at ocean engineering department of ITS.

The 8th Maritim Industry Expo had already been the time for Mr. Arief to announce the result of his new research about alternative energy made of a mooring buoy which convert hybrid energy from wind and current. That’s why it’s called Windcur (Wind & Current) Energy. At that time, this research which was funded by Dikti, had catched the attention of The Minister of Marine Affairs and Fisheries of Republic of Indonesia, Freddy Numberi. The Minister then asking more and more information about this such new technology including the advantages of it, the design, the maintenance, capacity, the location which will be applicable for it, and the depth of the sea.

After being explained about Windcur Energy, The Minister told Mr. Indriyono, the chief of BRKP-DKP, for this stuff to be tested further more. “This Windcur Energy can be used to supply the electric energy for thousands of islands all over Indonesia”, said Freddy.

Windcur Energy itself is a buoy mooring which is bound by 4 steel strings. In the buoy, there’s a drapped water turbine using blade NACA 0012. “This water turbin would be turned around by the sea current” said Mr. Arief. And there will be wind turbine Dariieus type on the buoy. Dariieus type was selected because this kind of turbine has low center of gravity and will not impact to the movement of the buoy.

In fact, the ebb current is always inconstant. That’s why when there’s no sea current we can still use the wind energy to keep the generator on.

Based on the wind data, the height, the period and the length of the wave, we can simply estimate the diameter of the buoy. Then, with batimetry and the eficiency of the shore, theoretically we got 100KW of the maximum capacity. So, if every single house get 200W of the energy, then one Windcur Energy can supply the energy of 500 houses. This energy research had been numerically and physically tested. For physical test, it was tested in Towing Tank.

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Posted by: whanz4ever | November 22, 2008

Breakfast time ala Coffee Morning FTK

There’s a unique morning gathering which was held on Saturday, Nopember 22, 2008 which take place at Plasa Kapal, Faculty of Marine Technology. It’s not like another breakfast, its a ++breakfast. A morning gathering which involving almost all civitas academica, including some of alumnus and the bureaucrat of this faculty.

This Coffee Morning was started with band performance from the students of FTK and welcome speech from the dean of Faculty of Marine Technology. Then the next was a sharing forum among the alumnus and the students of three different departments in FTK while having breakfast together. The students were very enthusias in following the advice story from the alumnus which most of them had already been successful persons. Some questions were asked by the students in order to know more about the struggle of the alumnus since they were a students untill become “someone”.

At the end, the band performance from the collaboration of the dean, lecturer and students were performed. A very happy and familiarity atmosphere was happened along the morning.

Posted by: whanz4ever | June 10, 2008

4 Coefficients in Making a Lines Plan

There are at least 4 kinds of coefficient, that is always used in making a Lines Plan. Those 4 coefficients are as follows :

1.  Block Coefficient (Cb) is the volume (V) divided by the LWL x BWL x T. If you draw a box around the submerged part of the ship, it is the ratio of the box volume occupied by the ship. It gives a sense of how much of the block defined by the Lwl, Bwl & draft (T) is filled by the hull. Full forms such as oil tankers will have a high Cb where fine shapes such as sailboats will have a low Cb.

2.  Midship Coefficient (Cm or Cx) is the Bwl x draft divided by the cross-sectional area (Ax) of the slice at Midships (or at the largest section for Cx). It displays the ratio of the largest underwater section of the hull to a rectangle of the same overall width and depth as the underwater section of the hull. This defines the fullness of the underbody. A low Cm indicates a cut-away mid-section and a high Cm indicates a boxy section shape. Sailboats have a cut-away mid-section with low Cx whereas cargo vessels have a boxy section with high Cx to help increase the Cb.

3.  Prismatic Coefficient (Cp) is the volume (V) divided by Lwl x Ax. It displays the ratio of the underwater volume of the hull to a rectangular block of the same overall length as the underbody and with cross-sectional area equal to the largest underwater section of the hull. This is used to evaluate the distribution of the volume of the underbody. A low Cp indicates a full mid-section and fine ends, a high Cp indicates a boat with fuller ends. Planing hulls and other highspeed hulls tend towards a higher Cp. Efficient displacement hulls travelling at a low Froude number will tend to have a low Cp.

4.  Waterplane Coefficient (Cw) is the waterplane area divided by Lwl x Bwl. The waterplane coefficient expresses the fullness of the waterplane, or the ratio of the waterplane area to a rectangle of the same length and width. A low Cw figure indicates fine ends and a high Cw figure indicates fuller ends. High Cw improves stability as well as handling behavior in rough conditions.

Posted by: whanz4ever | June 6, 2008

Hull (watercraft)

A hull is the body of a ship or boat. It is a central concept in floating vessels as it provides the buoyancy that keeps the vessel from sinking.

Nearly all watercraft, from small boats to the largest ships, adhere to a general form that serves the needs of stability and efficient propulsion, featuring:

  • horizontal cross-sections that have narrow, usually pointed, fronts (at the bow),
  • smooth widening from the bow until roughly the middle of the length (midships), and often narrowing smoothly but usually significantly to the extreme end (the stern), whose width may range from a large to an insignificant fraction of the beam.

Hull Shape

Hulls come in many varieties but are grouped primarily as follows:

  • Moulded, round bilged or soft-chined
defined as smooth curves
  • Chined or Hard-chined
have at least one pronounced knuckle throughout all or most of their length

After this they can be categorized as:

  • Displacement
the hull is supported exclusively or predominantly by the pressure of water displaced by the hull
  • Semi-displacement, or semi-planing
the hull form is capable of developing a moderate amount of dynamic lift, however, most of the vessel’s weight is still supported through displacement
  • Planing
the Planing Hull form is configured to develop positive dynamic pressure so that its draft decreases with increasing speed. (see: Planing (sailing)).

The inverted bell shape of the hull, with smaller payload the waterline cross-section is less, hence the resisitance is less and the speed is higher. With higher payload the outward bend provides smoother performance in waves.

Many hulls have composite shape, e.g., a fine entry forward and inverted bell shape aft.

Appendages

  • A protrusion below the waterline forward is called a bulbous bow and is fitted on some hulls to reduce the wave making resistance drag and thus increase fuel efficiency. Bulbs fitted at the stern are less common but accomplish a similar task. (see also : Naval architecture)
  • A keel may be fitted on a hull to increase the transverse stability, directional stability or to create lift.
  • Control devices such as a rudder, trim tabs or stabilizing fins may be fitted.

Terms

Bow is the frontmost part of the hull

Stern is the rear-most part of the hull

Portside is the left side of the boat when facing the Bow

Starboard is the right side of the boat when facing the Bow

Waterline is an imaginary line circumscribing the hull that matches the surface of the water when the hull is not moving.

Midships is the midpoint of the LWL (see below). It is half-way from the forwardmost point on the waterline to the rear-most point on the waterline.

Baseline an imaginary reference line used to measure vertical distances from. It is usually located at the bottom of the hull.

source : en.wikipedia.org

State-owned oil and gas company PT Pertamina said it wants to cooperate with Royal Dutch Shell to develop the giant gas block of Natuna D Alpha in Riau.

Shell has the technology needed to separate carbon dioxide from the gas, said Pertamina President Ari Hermanto Soemarno, who accompanied a Shell director Malcolm Brinded in a meeting with Vice President Jusuf Kalla Monday.

The block is estimated to have a reserve of 220 trillion cubic feet of gas but the gas has a high CO2 content of 70 per cent. The block was originally awarded to ExxonMobil but the U.S. company failed to implement its contract which was terminated in January, 2007.

source : antara.co.id

Posted by: whanz4ever | June 3, 2008

MPU Offshore Lift EUR 100 M Over Vessel Budget

June 2nd, 2008

Solstad Offshore ASA (SOFF) has an ownership of 30.23% of the company MPU Offshore Lift ASA (MPU). MPU has a large vessel under construction at Keppel Verolme in Rotterdam, which is designed for, among other abilities, the decommissioning of offshore installations.

The construction of the vessel is highly complex and has resulted in significant cost overruns compared to the original budget.

In connection with MPU’s impending bank financing which the company, under certain conditions, has been granted, the administration of MPU has made a revised cost estimate for the project. The Board of MPU, where SOFF is represented, has been presented a cost increase to finalize the project of approximately EUR 100 million, equivalent to approximately 25% compared to previous estimates presented to both the Board and the market in general. This increase of the construction cost needs to be covered by new equity.

 

The Board of SOFF is very disappointed by the unforeseen cost increase, and has decided not to participate in the coming equity issue in MPU.

SOFF expects to book a significant loss related to the investment of MPU. The exact amount is depending on the result of the ongoing financing process of MPU. SOFF’s total investment in MPU consist of NOK 209 mill in shares and USD 31,7 in a convertible bond.

source : www.rigzone.com

Posted by: whanz4ever | June 3, 2008

Another Offshore Find for Petrobras

May 31st, 2008

Brazil’s Petrobras continues its recent string of oil discoveries. A test well in the prolific offshore Santos Basin confirmed the presence of light oil.

Unlike other recent offshore discoveries that lie in very deep water, this one is in the relatively shallow waters in the southern part of the basin and may not be as difficult to access.

Petrobras thinks potential production could be more than 12,000 barrels a day per well. Further exploratory drilling is planned in June.

The test well was drilled about 170 miles off the coast of Sao Paulo state. The discovery more than a mile below the ocean and seabed.

source : http://www.miningtopnews.com

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