Abstract: Low permeation fittings and low permeation plastic containers using same are constructed by molding an outer component into the wall of a plastic container while it is being formed. This causes the opening of a passageway in the outer component to be covered with wall forming material. The inner component is then inserted into the outer component through the wall forming material thereby trapping the wall material between the internal and external components. The barrier layer of the container wall is therefore continuous from the container to inside the fitting. A new fuel container, fuel neck fitting, and flange for mounting components on a fuel tank are disclosed.

Abstract: The invention concerns a fuel container of plastic material such as a motor vehicle fuel tank, comprising one or more welded seams as seam locations for the body of the container and/or as connecting or sealing seams between the container wall in the region of openings and closure elements or covers welded thereto. At least some of the welded seams are at least partially penetrated by a duct which extends in the longitudinal direction in the seam and which can be filled with air and vented.

Abstract: A salt grid for supporting salt above a portion of a concentrated brine solution in a brine tank for use in a water softening system. The grid comprises first and second platforms disposed at first and second elevational levels with respect to the vertical wall of the brine tank. The fluid level in the brine tank can be adjusted to be higher than the lower platform of the salt grid but lower than the upper platform of the salt grid. In this manner, salt dissolves only above the lower platform part of the grid and consequently, the dirt included in the salt only passes through the lower platform of the grid. The brine well which transports brine solution from the brine tank to the resin tank is located away from the localized area in which the dirt collects at the bottom of the brine tank.

Abstract: A method of making a tank out of blown, thermoformed, or rotomolded thermoplastic material, the method comprising the following steps:

Abstract: In a plastic fuel tank comprising a main body having a laminated structure including a layer made of gasoline barrier material and an outer layer made of common plastic material, and a component part adapted to be secured in a hole formed in the tank main body, the component part includes at least a part made of weldable plastic material and welded to a part of the tank main body made of common plastic material, and a part made of gasoline barrier material and extending across said component part so as to separate the interior and exterior of the tank main body from each other. The two parts of the component part may be permanently integral to each other or may be detachably attached to each other. Thus, the welding strength can be ensured while the permeation of HC through the part made of the common plastic material can be avoided.

Abstract: A plastic fuel tank including a hollow plastic tank body and a variable length plastic strut in the hollow tank body. A pair of flat plastic sheets are vacuum formed at a forming temperature in upper and lower mold cavities to the shape of upper and lower plastic shells. The plastic strut includes an upper foot, a lower foot, and a coupling means operable to support the upper foot on the lower foot for back and forth linear translation against a controlled resistance. With the mold cavities separated, the plastic strut is interposed between the upper and lower shells. The mold cavities are closed to form the hollow tank body by fusion bonding the upper and lower shells at respective attachment flanges on each. When the tank body thereafter cures and shrinks, the plastic strut is squeezed between the upper and lower shells against the controlled resistance of the coupling means to fusion bond the upper and lower feet of the strut to the shells.

Abstract: A liquid storage tank and a method of fabricating and testing the liquid storage tank. The tank is collapsible for ease of transportation when not holding a liquid and includes a base portion and a top portion. The base portion has a bottom wall and a frusto-conical sidewall that is sealed to the bottom wall. The top portion is sealed to the sidewall, and has a flexible opening. The opening is linear in the preferred embodiment and is openable to draw liquid from the tank and closable to prevent contaminants from entering the tank. The bottom wall is substantially circular and the top portion includes two substantially semi-circular sections joined and overlapped along the straight edges to form an overlapped region. The sidewall includes generally triangular shaped sections, and the sections are joined to one another with seams that extend in a slightly helical fashion about the tank. The opening includes a slit in the overlapped region and two L-shaped members.

Abstract: A modular fluid storage tank, intended for underground storage of water, utilizing alternating circular and octagonal ribs in the main body and curved, ribbed, end caps. Interconnection of the tanks uses rigid pipe or semi-flexible hose. The coupling between the pipe and the tank incorporates a fitting, integrally molded into the tank, which extends into the interior of the tank, and a flexible sleeve which fits over, and is clamped to, the fitting and the pipe. The coupling is protected from the environment and is accessible from within the tank after installation for inspection and repair without the need to excavate the tank. The tank preferably has approximately equal length and diameter for improved strength. It is relatively small and lightweight, suitable for transport to and installation at a remote location without heavy equipment.

Abstract: A double-walled tank for storing liquids, such as heating oil, diesel fuel and lubricating and hydraulic oils, with an inside container 1 made of plastic, and an outside container 2 made of steel sheet, the outside container being provided with a container cover 6. The container cover 6 contains openings for receiving sockets 7 of the inside container 1, and has a collar 8 with a U-shaped cross section. The collar is mounted on the top edge of the container jacket and solidly joined with container jacket 3. The interior space of the collar 8 contains a seal for sealing the collar gas-tight against the container jacket 3. Pressure rings for applying pressure to seals are threaded on sockets 7, and compress the seals between the cover and the container.

Abstract: A serviceable sealed fuel tank includes a tank shell having a first half shell and a second half shell connected to the first half shell. The serviceable sealed fuel tank also includes at least one internal component disposed inside the tank shell between the first half shell and the second half shell. The serviceable sealed fuel tank further includes an inspection tower extending outwardly from the second half shell and being sealed. A portion of the inspection tower is removed to allow access to the at least one component after the first half shell and the second half shell are connected together.