Abstract:
A floating cover roof for a storage tank has a frame assembly and multiple floating units. The frame assembly has a holding frame and an outer rim. The holding frame has multiple longitudinal beams and transverse beams. Each longitudinal beam has a connecting seat, a first holding segment and a second holding segment. Two of the transverse beams are connected to two adjacent longitudinal beams to form a locating area between the beams. The floating units are mounted in the locating areas of the frame assembly, are connected to the beams of the holding frame and each has an outer casing and a body. The outer casing is mounted in one of the locating areas of the holding frame, is connected to the adjacent beams and has a casing body and a top board. The body is mounted in the outer casing between the casing body and the top board.
Abstract:
An oil tank floating roof device, includes a plurality of connecting bars and a plurality of floating units, which are respectively secured to the plurality of connecting bars by means a plurality of longitudinal and crosswise holding spaces collectively encircling the floating units. A plurality of locking members are fitted on the peripheries of the floating units, and two sides of the connecting bars respectively form at least one joining groove. The joining grooves respectively enable each of the floating units to longitudinally or crosswisely insert therein. The top portions of the connecting bars form at least one pressure resistant reinforcing plate, and the pressure resistant reinforcing plate is fitted with a plurality of locking portions. Bolts are used to respectively correspondingly pass through the locking portions and bolt into the locking members on the longitudinal or crosswise sides of the base of the floating units.
Abstract:
A batten joint for an internal floating roof of a fluid tank. The floating roof has at least a first panel having a first panel edge and a second panel having a second panel edge. The batten joint comprises a first panel retainer or retaining means adapted for retaining the first panel edge, a second panel retainer or retaining means adapted for retaining the second panel edge, and at least one batten engaging the first and second panel retainer or retaining means in a spaced apart configuration.
Abstract:
A vertical round container (1) for storing liquids comprises a floating cover (6) covering the surface of the liquid. The cover is sealed in relation to the container wall by means of flexible sealing elements (18, 19) and includes, on the lower side thereof, at least one compartment (62) which is open towards the liquid and contains gaseous media/vapors. Devices (40a) are provided for determining the submersion depth of the cover, and supply/discharge lines (29) are provided for modifying the quantity of the gaseous medium in the at least one compartment. The supply/discharge lines for the gaseous medium are connected to a central unit (28) provided outside the container region.
Abstract:
A floating cover (12) for a liquid storage tank (10) is made from a plurality of prefabricated sandwich panels (30). Each panel has an upper glass fibre composite layered portion (34), a honeycomb layer (36) the same size as the upper composite layered portion (34), and a lower fibre glass composite layered portion (32) that extends around the edges of the honeycomb layer by about 0.1 m. The panels are laid adjacent and abutting each other on a supporting form work, and the gaps above the extended lower layered portion (32) are filled in with sandwich sections similar to the structural layers of the sandwich panels. The upper parts of the in-fill sections overlap the upper layered portions (34) of the prefabricated panels by about 0.1 m.
Abstract:
The membrane cover has fold lines therein intersecting the walls of the reservoir at intersection points. A geometric chord or secant joins two intersection points, and defines, with a portion of the walls of the reservoir, a static segment in the membrane cover. The membrane cover in the static segment is tensioned along lines of force that are parallel to or that make acute angles, with the aforesaid chord or secant. The membrane cover in the static segment remains substantially planar and stationary, thus static, despite the rising and lowering of the remaining portion of the cover in response to variations in the level of the content of the reservoir. A hatchway is mounted in the static segment of the cover. In another aspect of the invention, the hatchway has an airtight compartment extending between the membrane cover and a point below the level of the material inside the reservoir.
Abstract:
The membrane structure according to the present invention has a top layer containing three plies. The top ply has UV stabilizers embedded therein; the bottom ply has stretch-resistant elements embedded therein; and the middle ply contains a co-extruded polyvinylidene chloride barrier film for example, for protecting the top ply against bio-gas infiltrations therein. In another aspect, the top and bottom plies containing polyethylene for protecting the middle ply from the weather and from corrosive environments under the membrane cover. In yet another aspect, the membrane structure has two foam layers affixed to the bottom ply. Each foam layer is made of juxtaposed strips of semi-rigid, closed-cell, polyethylene foam; wherein each strip in one foam layer is laid astride the adjoining edges of a pair of strips in the other foam layer. The strips of foam are bonded together and to the undersurface of the bottom ply by strips of fused polyethylene.
Abstract:
A floating cover or roof having a plurality of floating panels or panels is provided. The floating cover disposed in a storage tank includes a frame having a plurality of openings, the floating panels mounted into the respective openings, an inspection port formed on an upper member of the floating panel and communicated with an inside of the floating panel. The inspection port provides for inspection for the presence of moisture, vapor, and condensate trapped in the inside of each of the floating panels without disassembly of adjacent floating panels, and also provides for the replacement of a damaged or degraded one among the floating panels without taking the internal floating roof out of the storage tank.
Abstract:
A method for emptying a liquid storage tank that has a floating roof which becomes stationery a finite distance above the tank bottom, wherein, after the roof becomes stationery, liquid is continued to be withdrawn from inside the tank while vapor is removed from within the tank in a contained manner and an inert gas is introduced into the tank for pressure maintenance purposes.
Abstract:
A heating device (1) according to the present invention includes a substrate (2) made of a heat-resistant insulating material, a heating resistor layer (3) formed on the substrate (2), and a protective layer (6) formed on the substrate (2) to cover the heating resistor layer (3). The protective layer (6) is formed of glass to which alumina powder having a grain size of no greater than 5 .mu.m is added. The addition proportion of alumina powder is 3-30 Wt %, preferably 3-22 Wt % and particularly 10-22 Wt %. The addition of alumina powder remarkably increases the dielectric strength of the protective layer (6).