Abstract: In one aspect, a method of making a selected structure using composite materials is disclosed, which method in form includes providing a plurality of members each comprising a composite material, wherein each member is configured to be coupled to at least one other member in the plurality of members along a longitudinal side; coupling onsite the plurality of members along their longitudinal sides to form a base enclosed structure; and reinforcing onsite the base enclosed structure to form the selected structure.

Abstract: A containment vessel for potentially harmful fluid including a fluid impermeable primary container having a multi-layer floor including a leak detection system. A concentric secondary fluid impermeable containment vessel surrounds and is spaced from the primary containment vessel and likewise includes a multi-layer floor including a leak detection system.

Abstract: A segmented mechanical lock for a container including arcuate segments 12, 14, 16 having upstanding pins 18, pivot ring 20 having tangential slots 22 overlies the segments and upon rotary motion moves them outwardly into a groove 48 locking lid 6 in position in vessel 4.

Abstract: A sealing adapter hoop (6) designed to be sealingly slip fitted over conduits of differing structure (2,4) including chamferred ends (14,22), a smooth surface (20) to interact with a captured O-ring (30) and a groove (16) to accept a second O-ring (18).

Abstract: This method is particularly adapted for making tanks of different diameters. A plurality of arcuate forming sections are provided by forming a flexible sheet of a panel section against rigid arcuate forming segments having a degree of curvature corresponding to that of the inner surface of the tank to be formed. Turnbuckles are used to form the flexible sheets against the segments. These forming sections are then accurately located on a base circumference location and rigidly interconnected to make a rigid cylindrical forming structure, against which the fiber reinforced resin is layed up to make the tank structure. The panel sections each comprise a sheet having a pair of vertical edge bracing and connecting flanges by which the panel sections are joined, and a plurality of locating brackets which engage the forming segments to locate the forming sections with respect to one another.