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18.10.2018
LIQUEFIED GASES MARINE TRANSPORTATION AND STORAGE

The known and researched world gas reserves exceed those of oil. However, for so many years the gas has not attracted too much interest. It was rather considered a sort of hindrance by the people engaged in the oil recovery. The associated gas used to be flared. The wells containing no oil but a plenty of gas used to be totally ignored. The first practical attempts for gas production were made at the beginning of the last century.

People had finally recognized the potential of gas reserves to change the way of their living. The development of gas reserves has eventually led to the need for its transportation which, noting its flammable nature, should be carried out in a safest way. The present publication provides a good review of the marine LNG transportation as well as of the conditions that prevail today.

Without going too deep into technical details of the transportation, the author gives a nice overview of all important aspects including the characteristics of the vessels engaged in transportation, current regulations and rules governing it, gas storage ashore and of course safety considerations. The readers will find valuable information about everything associated with marine transportation of gas from both safety, technical and commercial perspectives.

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18.10.2018
Barge Carrying Vessels

There are two existing types of barge carriers utilized today - the LASH system whereby the barge, or lighter, is hoisted on board the ship by a large gantry crane, and the SEABEE type where the barge is floated onto a synchrolift platform, elevated to the proper level, and then rolled along that deck into its stowed position. In a float-on concept the ship itself sinks similar to a floating drydock.

The barge carrier is best suited to trades where the barge can be utilized at both ends for distribution by river or other inland waterways. Although a point of debate, it would appear that the barge carrier is best suited to high grade bulk shipments in small quantities. Finished products would seem to be better shipped in containerships and large quantities of bulk would be most efficiently shipped in a bulk carrier.

LASH System

Although there are many variations in LASH ships with regard to barge and/or container capacity, we will concentrate on the barge aspect. In referring to the LASH arrangement, it can be seen that the LASH ship is arranged along the lines of a bulk carrier with a single deck and all accommodations forward. Machinery is located just aft of midships with port and starboard stacks to allow the crane access all the way to the cantilevered crane supports on the stern.

The lighters are brought in between these cantilevered arms and hoisted vertically by a gantry crane of 500 tons capacity. The crane legs are equipped with guides that line up with the stern and cargo hold guides. These guides ensure that the lighter does not sway while the crane is traveling along the deck. Traveling speed of the crane is 1.02 m/s (200 ft/min).

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18.10.2018
DIESEL ENGINE SYSTEM DESIGN

The diesel engines are referred to as maybe the most promising powertrains in the nearest future, if we take into consideration their truly superior thermal efficiency as well as the oustanding reliability. Nowadays, diesel engines are widely used in the most of the commercial vehicles, industrial applications, cars and light-duty lorries. Modern emissions standards and demands of the customers of today are driving diesel engineering to become a dramatically growing applied engineering discipline in order to meet the applicable requirements of designing optimum diesel engines.

The engineering population in diesel engines' design is growing quite fast. The requirement for new advanced design theories and professional reference books has become pressing and obvious. This volume presents my own experience and findings in many interrelated areas of diesel engine performance analysis and system design. The present book is also intending to establish some sort of emerging area of the diesel engine system design for the diesel industry.

The whole technical process of designing the diesel engine is very complex indeed since it involves so many different people and companies from the original equipment makers to suppliers. A system design approach to set up correct engine performance specifications is essential in order to streamline the design process.

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18.10.2018
NP 013-014-015 AUSTRALIA PILOT VOLUME I-II-III

NP 013-014-015 Australia Pilot Volume I-II-III

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17.10.2018
LARGE SCALE RESCUE OPERATIONS AT SEA

The material presented in the pages of this guidebook is mainly intended to be used as the the advisory to the shipping companies. The publication was first released in 2014 in response to the huge number of migrants who attempted to reach Europe and required rescue by the crew members of the merchant ships there in the Mediterranean sea.

This is a second edition of the publication featuring significantly revised and updated content taking into account the recent practical experience gained by the crew members, Masters and shipping companies. It is supported by the most recognized industry organizations such as Intertanko, ASF, ITF, Intermanager and others.

More than a thousand of merchant ships have been involved in the rescue operations since the time when the crisis in the region started to escalate. They assisted with the successful rescue of more than fifty thousand people. It is not a secret that the shipping industry of today is facing a need to conduct even larger scale rescue operations.

Though the conventional merchant vessels are not commonly well suited to conduct the rescue operations of such scale, it is quite likely that they will continue to be approached by RCCs. This document will provide assistance to the shipping companies with identifying and properly addressing particular issues that may be faced by their ships during such operations...

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17.10.2018
Introduction to the Offshore Rig Hoisting System

In the previous article we have been acquainted with the very basics of the power system of the offshore drilling rig. And now, let us have a look at another fundamental system of any rig - the hoisting system. It is also one of the most important systems without which no drilling could be done.

The system serves a purpose of lifting the whole drill stem in drilled hole and out of it in the process of making a new well and lowering the casing down. This system itself is made of several elements, namely the substructure, the derrick (in some cases there can be the mast instead) and the drawworks, then the crown block and the traveling block equipped with the hook, and of course the drilling line.

The substructure of any rig is specifically designed and constructed to be able to effectively support the weight of the derrick taken together with the rotary table and the load of the drill stem when it is either suspended or standing in the derrick. Note that the substructure shall provide the support to the casing string during the time when they run the casing.

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17.10.2018
NP 008 PACIFIC COASTS OF CENTRAL AMERICA AND UNITED STATES PILOT

NP 008 Pacific Coasts of Central America and United States Pilot

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16.10.2018
Steel Ordering and Storage

Ordering of Steel

Mill orders are normally prepared by the drawing room, with the plate sizes being lifted from ship plans or plating models or, alternatively, obtained directly from computer printouts. Each piece of steel is assigned an identifying mark on the plan and on the bill of material. Plates to be severely hot-formed are ordered somewhat thicker than the required size in order to allow for the thinning down that occurs during the forming process.

There are price extras for very narrow, very wide and odd gage plates. Plates in the 1830 to 2286 mm (72 to 90-in.) width range are the least expensive per unit weight. The most economical sizes for the shipyard are determined after considering all related factors including the number of welded seams. Selected even-gage plates cost less per unit weight. In English units, the even gages are normally every 1/32 in. for plates up to 1/2 in. thick and every 1/16 in. for plates over 1/2 in. thick. In metric units, even gages are normally every one mm for thin plates and every two or more mm for the thicker plates.

The exact called-for grade of steel may not be obtainable for some ship repairs or when a small amount of steel or a special grade of steel is required. It is then necessary to obtain a proper substitute. Specific classification society approval of the substitute might be required, especially when ASTM and other non-ship grades are involved.

There has been little effort to increase the amount of standardization of plate or shape sizes beyond that normally adopted because such increases have been considered to be of little, if any, economic value.

Design work on structures incorporating large castings or forgings, such as a stern frame, is started early due to the long lead time required for these large items./p>

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