A firestop system for fire stopping a bus duct that passes through an opening in a marine deck or a marine bulkhead includes a boot seal wrapped around the bus duct housing. The boot seal has a top end attached to the bus duct, and a bottom end attached to the division. The boot seal is made of flexible material to allow for movement of the bus duct relative to the division due to vibration. The boot seal may be made of a thermal barrier wrap or other high-temperature insulating mat materials to allow heat generated under normal condition to escape while providing firestopping and temperature resistance under fire exposure conditions. The firestop system may also have a gasket positioned between the bus duct and the boot seal to accommodate irregularities in the outside surface of the bus duct housing.

A flat catamaran watercraft construction is provided having a bow that defines a split V configuration in which the bottom surface of each of the two asymmetrical catamaran hull portions at the forward section of each hull portion slope upward from the inboard side of the hull portion to the outboard side of the hull portion. Such upward slope of the bottom of each hull portion sheds water and waves to the outboard sides of the vessel as it travels through the water in order to minimize the amount of water and spray that is directed upward between the individual hull portions towards the passengers. The rear portions of each such hull portion define an angled slope along both inboard and outboard sides, which angled slopes allow the rear portion of the watercraft to slide and drift sideways along the surface of the water as the watercraft turns. The flat catamaran hull portions and deck of the watercraft are preferably of unibody construction, such that they are formed (e.g., molded or otherwise machined) in a single, one-piece assembly.

A flat catamaran watercraft construction is provided having a bow that defines a split V configuration in which the bottom surface of each of the two asymmetrical catamaran hull portions at the forward section of each hull portion slope upward from the inboard side of the hull portion to the outboard side of the hull portion. Such upward slope of the bottom of each hull portion sheds water and waves to the outboard sides of the vessel as it travels through the water in order to minimize the amount of water and spray that is directed upward between the individual hull portions towards the passengers. The rear portions of each such hull portion define an angled slope along both inboard and outboard sides, which angled slopes allow the rear portion of the watercraft to slide and drift sideways along the surface of the water as the watercraft turns. The flat catamaran hull portions and deck of the watercraft are preferably of unibody construction, such that they are formed (e.g., molded or otherwise machined) in a single, one-piece assembly.

A boat pontoon having a concave V-shape on a bottom portion thereof, generally straight vertical sides, a flat top panel member, and a removable and replaceable skid pad running longitudinally along the bottom of the pontoon. Vertically oriented gussets are positioned on an interior of the pontoon, to provide structural integrity and additional strength. In a preferred embodiment, a buoyant foam is provided within the interior cavity of the pontoon.

A liquefied gas tank installed in a surrounding structural body includes: a tank main body in which a liquefied gas is storable, the tank main body including a plurality of planar portions and corner portions between the planar portions, the corner portions having less rigidity than that of the planar portions; a bottom supporting body that supports the tank main body from below the tank main body; and a plurality of side supporting bodies that support the tank main body from side of the tank main body. The tank main body is configured to stand by itself by being supported by the bottom supporting body when the tank main body stores no cargo, and be supported by the bottom supporting body and the side supporting bodies when the liquefied gas is stored in the tank main body.

A liquefied gas tank installed in a surrounding structural body includes: a tank main body in which a liquefied gas is storable, the tank main body including a plurality of planar portions and corner portions between the planar portions, the corner portions having less rigidity than that of the planar portions; a bottom supporting body that supports the tank main body from below the tank main body; and a plurality of side supporting bodies that support the tank main body from side of the tank main body. The tank main body is configured to stand by itself by being supported by the bottom supporting body when the tank main body stores no cargo, and be supported by the bottom supporting body and the side supporting bodies when the liquefied gas is stored in the tank main body.

A hopper barge is disclosed. The hopper barge comprises a hopper compartment for carrying a plurality of containers, the hopper compartment comprising a hopper compartment deck. The hopper barge comprises an inner-bottom portion defined in part by the hopper compartment deck and a bottom portion of the hopper barge. A plurality of longitudinal bulkheads are arranged in parallel within the inner-bottom portion of the hopper barge. A plurality of transverse bulkheads are arranged in parallel within the inner-bottom portion of the hopper barge, the plurality of transverse bulkheads running perpendicular to the plurality of longitudinal bulkheads. A plurality of pedestal supports are affixed to the hopper compartment deck, wherein at least one of the plurality of longitudinal bulkheads intersects at least one of the plurality of transverse bulkheads at a position beneath at least one of the plurality of pedestal supports.

A hopper barge is disclosed. The hopper barge comprises a hopper compartment for carrying a plurality of containers, the hopper compartment comprising a hopper compartment deck. The hopper barge comprises an inner-bottom portion defined in part by the hopper compartment deck and a bottom portion of the hopper barge. A plurality of longitudinal bulkheads are arranged in parallel within the inner-bottom portion of the hopper barge. A plurality of transverse bulkheads are arranged in parallel within the inner-bottom portion of the hopper barge, the plurality of transverse bulkheads running perpendicular to the plurality of longitudinal bulkheads. A plurality of pedestal supports are affixed to the hopper compartment deck, wherein at least one of the plurality of longitudinal bulkheads intersects at least one of the plurality of transverse bulkheads at a position beneath at least one of the plurality of pedestal supports.

The invention relates, among other things, to a component including at least one base plate, at least one cover plate arranged on the base plate, at least one damping layer arranged between the base plate and the cover plate and at least one stiffening element. The base plate is free from the cover plate and the damping layer at least in sections on the cover plate side in a connection area, and the stiffening element is connected to the base plate and the cover plate on the cover plate side in the connection area. The invention further relates to a method for the manufacture of a component and a use of a component.

The invention relates, among other things, to a component including at least one base plate, at least one cover plate arranged on the base plate, at least one damping layer arranged between the base plate and the cover plate and at least one stiffening element. The base plate is free from the cover plate and the damping layer at least in sections on the cover plate side in a connection area, and the stiffening element is connected to the base plate and the cover plate on the cover plate side in the connection area. The invention further relates to a method for the manufacture of a component and a use of a component.