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    <managingEditor>tris-trb@nas.edu (Bill McLeod)</managingEditor>
    <webMaster>tris-trb@nas.edu (Bill McLeod)</webMaster>
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      <title>DRY-DOCKING OF MERCHANT SHIPS: ECONOMIC CONSIDERATIONS</title>
      <link>https://trid.trb.org/View/60722</link>
      <description><![CDATA[To establish an economic balance between the expenses (including loss of revenue) incurred in dry-docking for routine maintenance of a ship's bottom and propeller, and the gains from the improved performance, is an old problem that does not easily lend itself to solutions which are conclusive or generally valid.  The Author re-examines this problem and its attendant difficulties in some detail, and derives equations for determining the economically optimum interval between dry-dockings.  Because the validity of the assumptions made in the interests of simplification will sometimes be doubtful, and become it is difficult to determine a ship's speed (to obtain data for the calculations) independently of weather conditions, there may be some problems in using these equations.  However, such difficulties can be overcome if speed and fuel consumption are measured in good weather conditions (in particular, when the sea is calm).  The measurements, which require little in the way of equipment and no special skill, should be done whenever a speed decrease or increase due to a change in the condition of the hull or propeller is suspected.  Order from: BSRA as No. 47,192.]]></description>
      <pubDate>Thu, 16 Feb 1978 00:00:00 GMT</pubDate>
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      <title>DRY DOCKING--AN EVOLUTION</title>
      <link>https://trid.trb.org/View/55465</link>
      <description><![CDATA[The intention of this paper is not to reiterate facts and procedures presented previously on the design and operation of the floating drydocks, but to review their effects and influence on the practical operation of drydocks, with an emphasis on the economy and safety of drydocking todays commercial and naval ships.]]></description>
      <pubDate>Sat, 29 Oct 1977 00:00:00 GMT</pubDate>
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      <title>DRYDOCKING AND REPAIRS</title>
      <link>https://trid.trb.org/View/1477</link>
      <description><![CDATA[The reasons for a ship to undergo periodical drydocking and repairs are scrutinized and a method to determine the most economic period between the docking is put forward. Forced drydocking and repairs are also discussed. Problems connected with drydocking, especially of large size tankers, are reviewed and possible solutions to some of them presented.  Possibilities for mechanization of works in dry dock and handling of material are discussed and experiences from trials made are presented. Suggestions for future docks and specialized repair yards are given.]]></description>
      <pubDate>Wed, 30 Oct 1974 00:00:00 GMT</pubDate>
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      <title>THE ECONOMIC CONSEQUENCE OF SHIP SERVICE SPEED REDUCTION</title>
      <link>https://trid.trb.org/View/19325</link>
      <description><![CDATA[The objective of this report is to clarify some of the economic consequences of ship service speed reduction. The methods and principles presented are generally valid, but in this report large tankers are considered.  A reduction in the ship service speed is to a great extent caused by roughening and fouling of the underwater hull. A simple (manual) method to find this speed reduction and a method to evaluate the minimum docking interval with respect to treatment of the underwater hull are presented.  An extension of the off-hire concept is given.  Results are presented in a way that make them almost independent of ship size and freight rate.]]></description>
      <pubDate>Mon, 15 Jul 1974 00:00:00 GMT</pubDate>
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