Liquid storage tank

Claim 2

A liquid storage tank having a floor and walls each made up of rectangular moulded panels of reinforced synthetic plastic material, each said panel comprising a wall the periphery of the panel at the corner of the wall being relieved, the wall having at the periphery thereof a flange integral therewith extending away therefrom and the wall having at least one stiffening formation integral therewith, said panels in each said wall and in said floor being secured together by first securement means engaging adjacent flanges of said panels, said tank further comprising auxiliary members each occupying a space defined by adjacent corners of said panels, each said auxiliary member having formation means restricting relative displacement of respective flanges of adjacent panels transversely of said adjacent panels, at least certain of said auxiliary members each having integral lug means positioned within said tank, said tank further comprising bracing means positioned wholly within said tank secured within said tank by second securement means to said lug means of said certain auxiliary members, and said tank further comprising seal element means held compressed by said first securement means in sealing relationship with said adjacent panels between adjacent flanges thereof and held compressed between said auxiliary members and respective surrounding panels in sealing relationship therewith by said first securement means.

Claim 3

A liquid storage tank according to claim 1, in which said formation means comprise spaced formation between which said respective flanges of said adjacent panels are located.

Claim 4

A liquid storage tank according to claim 1, in which each said integral lug means lies in a horizontal plane coincident with or close to the horizontal plane at which the respective panels meet.

Claim 5

A liquid storage tank having a floor and walls each made up of square moulded panels of glass reinforced synthetic plastic material, each said panel comprising a wall the periphery of the panel at the corner of the wall being relieved, the wall having at the periphery thereof a flange integral therewith extending away therefrom and the wall having a planar part adjacent said flange but having an integral central circular stiffening formation which is curved, said panels in each said wall and in said floor being secured together by first securement means engaging adjacent flanges of said panels, said tank further comprising auxiliary members each occupying a space defined by adjacent corners of said panels, each said auxiliary member having spaced formations between which the respective flanges of adjacent panels are located, at least certain of said auxiliary members each having integral lug means positioned within said tank, said tank further comprising bracing means positioned wholly within said tank secured within said tank by second securement means to said lug means of said certain auxiliary members, and said tank further comprising seal element means held compressed by said first securement means in sealing relationship with said adjacent panels between adjacent flanges thereof and held compressed between said auxiliary members and respective surrounding panels in sealing relationship therewith by said first securement means.

Claim 6

A liquid storage tank having a floor and walls each made up of square moulded panels of glass reinforced synthetic plastic material, each said panel comprising a wall the periphery of the panel at the corner of the wall being relieved, the wall having at the periphery thereof a flange integral therewith extending away therefrom and the wall having a planar part adjacent said flange but having an integral central circular stiffening formation which is curved, said panels in each said wall and in said floor being secured together by first securement means engaging adjacent flanges of said panels, said tank further comprising auxiliary members each occupying a space defined by adjacent corners of said panels, each said auxiliary member having spaced formations between which the respective flanges of adjacent panels are located, at least certain of said auxiliary members each having integral lug means positioned within said tank, said tank further comprising bracing means positioned wholly within said tank secured within said tank by second securement means to said lug means of said certain auxiliary members, and said tank further comprising seal element means held compressed by said first securement means in sealing relationship with said adjacent panels between adjacent flanges thereof and held compressed between said auxiliary members and respective surrounding panels in sealing relationship therewith by said first securement means.

Claim 7

A liquid storage tank according to claim 4, in which at each of said relieved corners of each said panel said flange extends at 45° to adjacent side portions of said periphery and in which each said auxiliary member where four co-planar panels embrace the same is a first-type member and has four wall surfaces in square relationship, said seal element means being held compressed in said sealing relationship between said four wall surfaces and respective relieved corners of respective ones of said four co-planar panels.

Claim 8

A liquid storage tank according to claim 4, in which at each of said relieved corners of each said panel said flange extends at 45° to adjacent side portions of said periphery and in which the respective auxiliary member where only two co-planar panels embrace the same is a second-type member which has two wall surfaces in square relationship and a third wall surface in the relationship of a hypotenuse thereto, said seal element means being held compressed in said sealing relationship between said two wall surfaces and respective relieved corners of respective ones of said two co-planar panels and between said third wall surface and an elongate member making up said wall or said floor of said tank.

Claim 9

A liquid storage tank according to claim 4, in which at each of said relieved corners of each said panel said flange extends at 45° to adjacent side portions of said periphery and in which where three said panels approach a corner of said tank, there are three third-type auxiliary members, each having two wall surfaces in square relationship and a third wall surface in hypotenuse relationship thereto, and in which the respective seal element means is held compressed in said sealing relationship between said two wall surfaces and respective elongate members making up said walls and between said third wall surface and the respective relieved corner of the respective panel.

Claim 10

A liquid storage tank according to claim 4, in which said flange and said stiffening formation of each said panel both extend outwardly away from the interior of said tank but in which said stiffening formation lies within the volume defined by said planar part of said wall and by said flange.

Claim 11

A liquid storage tank according to claim 4, in which said flange of each said panel extends outwardly away from the interior of said tank and in which said stiffening formation of each said panel extends inwardly towards the interior of said tank.

Claim 12

A liquid storage tank according to claim 4, in which said curved stiffening formation is convex in the same direction as said flange extends relative to said planar part of said wall.