TM 55-607/NAVSEA OP 3221 Rev 2
a. LASH ships are among the largest and fastest dry cargo ships in the world. The ships feature a 500-toni gantry
crane for loading an(l unloading lighters and, if so equipped, a self-propelled 35-ton gantry crane for loading and
unloading containers. The lighter crane is designed to traverse the entire length of the main deck with lighters stowed
two high on the hatch covers of' each hold. It runs on heavy-duty rails located directly over the ship's longitudinal
bulkheads, which extend outward at the stern in the form of twin cantilever structures. The crane's lifting frame, which
operates similarly to a container lifting frame, is self-centered on the lighter's stacking posts and is equipped with positive
latching arrangements to ensure a safe lift. Vertical displacement of the lighter is accommodate(l with an integral
constant tension feature, which allows safe operation during moderate sea conditions.
b. LASH lighters are essentially floating ship holds. They are rectangular in configuration, with double hulls and
either fully removable or retractable hydraulic hatch covers. Although there may be slight differences in dimensions or
outfitting between manufacturers, all lighters are approximately 61 feet 6 inches by 31 feet 2 inches by 13 feet deep.
of appendix D lists the typical characteristics
of a commercial lighter equipped with three removable hatch
covers. Lighters used on other commercial LASII systems are comparable. Figure 10-2 is a schematic drawing of a
typical lighter. These dimensions should be taken into account by both cargo planners and shiploading personnel in
order to develop the most efficient stow pattern for any given cargo and to determine whether use of prefabricated
dunnage structures is feasible. LASH lighters are also designed with 36 tiedown fittings along the side walls an(l end
bulkheads (not shown in fig 10-2). The fittings are rated at 40,000 pounds each an(l are useful for tomming down loose
cylindrical items or securing large loads. Two levels of fittings extend around the entire interior of the lighter. 'The first
level, with five fittings on each side an(l four on the ends, is 2 feet 6 inches above the deck. The second level also has
five fittings on each side and four on the end(s and( is located 8 feet above the deck. Figure 10-2 also shows a cutaway
view of the double hull construction, which greatly decreases the likelihood of cargo damage from flooding or collisions.
LI lighters are also equipped with fittings that call be connected to the ship's environmental-control system to provide
ventilation and temperature an(l humidity control for sensitive explosives cargo.
Some LASII barges have stiffeners on the inside hull instead of smooth steel sheathing. These
barges require 2-inch sheathing for all cargo.
As indicated in figure 10-2, most LASII lighters have smooth steel bulkheads in the cargo stowage space. Some lighters,
however, have ribbed bulkheads in the cargo stowage space. This configuration is equally acceptable for ammunition
stowage, although it requires additional sheathing considerations, which are detailed in paragraph 10-6.