Conference Proceedings
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Item The prospects of dredging and indigenization of dredger design(Dredge India INAvation 2015 conference, 2015) Eswara, Arun Kishore; Ramesh, U. S.The scope for dredging in India is potentially vast, looking at the prospects of development and maintenance of existing major ports, building new ports, offshore resources exploration, demand from navy and more interestingly the projects envisaged for national waterways. The capital dredging demand during 2012-2017 is about 639 million m3 and that of maintenance dredging during the same period is about 521 million m3. This requires the employment of substantial number of dredgers of varying capacities. The minor sector dredging demand of about 100 million m3, during the said period, offers additional opportunity for dredging. The modal shift of cargo to inland and coastal waterways offers bright prospects for a sustainable economic prosperity. The government encouragement for “Make in India” has brought in a lot of economic interest as well. This is an excellent period to target for indigenization of dredger manufacture. Locally manufactured dredgers not only reduce costs of dredging but also encourage business climate. Further, it will enable India to produce globally competitive world class dredgers. The present paper is written in this context of presenting our study1 encompassing the scope for dredging activity, identifying suitable types and capacities of dredgers for employment in India. The paper also touches upon the present shipbuilding infrastructure, dredger equipment manufacturers and a road map for indigenization. The paper concludes with forecasting future dredging demands, scope for native dredgers manufacture, identifying a particular target range for indigenization.Item Some statistical relationships among dredger particulars observed in the Indian dredging fleet(The Royal Institution of Naval Architects, 2015-12-10) Eswara, Arun Kishore; Ramesh, U. S.Cutter suction dredgers (CSD), Trailing suction hopper dredgers (TSHD) and Grab dredgers form 88% of the total Indian fleet size, respectively in the order of individual share. Indian yards have achieved 90% indigenization in design and construction of grab hopper dredgers. However, there is a techno-economic backlog in India to manufacture some vital components for CSDs and TSHDs and companies are increasingly looking to buy foreign made dredgers at a high price. Dredging demand in India at ports and in navigable inland water ways is set to grow with the encouragement for water transport. Ministry of Shipping, Govt. of India has sponsored studies at Indian Maritime University-Visakhapatnam (formerly, NSDRC) for indigenization of dredger design and manufacture. The present paper aims to illustrate the existing dredger fleet of India and bring out some interesting correlations that aid the design of dredgers. Dredgers are built for a specific function. Due to this design objective, they differ from other marine vessels on the aspects of principle particulars, hopper capacities, powering and other functional data such as cutter power for CSD and dredge pumps power etc. The identified correlations among such parameters observed from the Indian dredging fleet are discussed. Certain ratios among the main dimensions for a TSHD such as length/breadth, breadth/dredge depth and breadth/draught, also known as ship ratios, are a key to dredger design and are known to vary with market conditions or time. They indicate design trends for future dredgers and require to be kept updated.