A Treatise On The Principles And Practice Of Dock Engineering

SHED ACCOMMODATION. 365 reloading of a discharging vessel, they serve to decrease the amount of available quay space, and thus interfere with freedom and rapidity of movement. It is a good plan, where feasible, for a ship to discharge her inward freight at one berth, and then proceed to another to receive her out- ward consignments. Mr. Hayter * has laid it down as his opinion that 350 or, at the most, 400 tons of goods per lineal yard of quay can be dealt with per annum. But in the case of Liverpool, of British ports at any rate, this quantity has been largely exceeded, upwards of 800 tons of goods per lineal yard of quay having passed through the double-storey sheds at that port in one year. At Marseiiles, 500 tons has been stated as the limit; but, on the other hand, 1,000 tons is no unusual allowance at Russian ports, and as much as 2,000 tons per lineal yard have been accommodated on certain quays at Antwerp t and Liverpool. The ensuing- table gives detailed instances of the ratio of the registered tonnage of vessels to the length and area of the berths occupied. TABLE XXVIII.—Oomparison of Number and Nett Registered Tonnage of Vessels Discharged and Loaded during One Year at certain AprROPRIATED Berths IN Liverpool DoCKS, WITH Length of Quay Space and Area of Shed Accommodation involved. Berth. Quay Space in Lineal Feet. Shed Area in Sq. Yards. Vessels Worked. Days Occupied Proportion of Tonnage. No. Tonnage. Dis- charging. Loading. Per Lin. Ft. of Quay. Per Sq.Yd. of Shed. A 2000 16,727 114 428,729 3094 247 214-36 25-03 B 1408 12,594 102 310,818 315 229 220-75 24-68 C 900 7,970 58 180,548 132 153 200-5 22-65 D 800 8,048 63 141,236 188 171 176-54 17-67 E 900 9,108 57 179,402 144 1584 199-33 19-69 F 438 3,467 41 68,264 19 178 164-98 19-68 G 566 6,639 37 89,995 1474 884 159-18 13-55 H 1400 13,187 91 278,639 2674 189 199-02 21-13 I 1103 10,088 80 210,886 1524 239 191-19 20-9 J 708 7,120 26 51,157 584 38 72-25 7-18 K 716 7,249 43 119,279 166 153 166-57 16-45 L 703 9,637 63 159,097 1524 784 226-31 16-5 M 200 714 70 19,384 594 2 96-92 27-28 The sheds in every instance were single-storey sheds. Where the nature of the traffic is variable, it is evident that no correla- tion whatever between its amount and the area or length of quay space is possible. A shed may be used at one time for the reception of grain in bulk, at another for cotton in bales, at another for provisions in boxes. The * Min. Proc. Inst. C.E., vol. o., p. 44. t Proceedings, Seventh Inter. Nav. Cong., Brussels, 1898.