Load Lines

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Load Lines

A marking indicating the extent to which the weight of a load may safely submerge a ship; also called Plimsoll line.

The load line, or Plimsoll mark, is positioned amidships on both sides of a vessel. Its purpose is to indicate the legal limit to which a ship may be loaded for specific ocean areas and seasons of the year. The basic Load Line Certificate is issued after a complex calculation is made to determine exactly where the Plimsoll mark should be positioned. These certificates take several forms, such as international voyage, coastwise traffic, and Great Lakes operations.

By calculating the load line, the agency issuing a certificate has determined, among other aspects of seaworthiness, that a vessel has enough volume of ship (reserve buoyancy) above the waterline so that it will not be in danger of foundering or plunging when under way in heavy seas. In the United States the U.S. Coast Guard issues load line regulations; routine assignment of load lines is handled by the American Bureau of Shipping.

A series of multilateral treaties has been executed to impose on signatories the responsibility of seeing that ships flying under their flag have safe load lines designated and that they are observed. The principal treaty is the International Convention on Load Lines 1966. The use of load lines on vessels sailing under the flag of the United States is mandated by federal law (46 U.S.C.A. 86 [1973]). The treaties typically do not apply to ships of war, small ships, pleasure boats, and fishing vessels.

References in periodicals archive ?
The Load Lines Convention aims to prevent the ship's overloading by prescribing the minimum reserve buoyancy and freeboard of ships.
At the fundamental frequency of operation, a 50 + j0 ohm load line is presented to the device.
The value of load conductance for maximum power represents a compromise between large voltage swing with a horizontal load line and large current swing with vertical load line.
Because the current measurement technique is less sensitive to temperature and process variations than traditional analog solutions the Digital Multiphase chipset delivers very accurate out of the box load line performance.
1) the device's internal current source sees [Z.sub.L] [n] directly across it for the purposes of constructing the load line (Figure 1a), [C.sub.ds] and any drain inductance have been absorbed into [Z.sub.L] [n];
To accomplish this, one must understand the concept of an engine air flow load line. The engine air flow load line, or simply the load line, represents the resistance to flow thai is created by the engine cylinder.
For the parasitic less device considered up to this point, the 180 [degrees] phase condition is met by using a purely real, load impedance [R.sub.L], and the magnitude condition is met by choosing the optimum load line illustrated in Figure 4, for the simple, constant gm, class A amplifier case.
furnace, load line displacement gage, DCPD based crack growth monitoring, testing software with
Hydraulic draw-works, two-speed load line and extendible counterweight are carried over from its predecessor, the 561N.
The block set features four-part load and boom lines, two-speed planetary winches with free-fall on the load line, for faster, smoother operation.
Amendments will be made to the Merchant Shipping (Safety) (Load Line) Regulation and the Merchant Shipping (Safety) (Load Lines) (Deck Cargo) Regulation.
It features a single lever controller that activates the load line and the boom line separately or in combination.