VESSEL PUMPING PERFORMANCE

For years, firms within the tanker industry have chartered vessels which have been guaranteed by their owners as being capable of various pumping rates. Until recently, it has been extremely difficult, if not unfeasible, to calculate how well any given vessel actually did perform, relevant to the stipulations of the Charter Party. To this end, the authors have adapted a "pressure drop" formula (a variation of Bernoulli Equations) for the flow of liquids in closed conduits in arriving at a "computed discharge rate." The article is an explanation of procedures that will enable an analyst to determine the pumping performance of a vessel, using a minimum of time and effort. A typical Tanker Time Charter Party, with specified qualifications/assumptions, has been used as the benchmark of the procedures outlined. Very simply, an Owner's "water rate" guarantees are compared to other liquids which differ from water by virtue of their densities and viscosities. Products that are compressible or dilatant, colloidal or rheopectic in nature cannot be included in these discussions. The procedures are presented in graph form as this medium facilitates an understanding of the principles involved without oversimplifying the problem. In addition, this illustrates the feasibility of "on the dock" surveillance of performance.

  • Corporate Authors:

    Maritime Activity Reports Incorporated

    107 East 31st Street
    New York, NY  United States  10016
  • Authors:
    • Davis, R M
    • Chalson, D R
  • Publication Date: 1975-8

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00099876
  • Record Type: Publication
  • Source Agency: Maritime Reporter and Engineering News
  • Files: TRIS
  • Created Date: Sep 30 1975 12:00AM