48. . . . . . and one of the stainless steel angles located on it so that the outer edge of the “keder” is exactly coincident with the setting-out mark.
50. . . . . . and the stainless steel “through bolt” is hammered home.
51. This process continues right round the circumference until the inner membrane is entirely anchored. Note that there have been no parts requiring casting-in.
52. The straps which connect the inner membrane to the outer membrane are shown here being assembled. These straps are needed to support the inner membrane (at its equator) from the outer membrane when inflated.
53. The inner membrane attachment is welded in place in the factory . . . . .
54. . . . . . and to this is simply connected another length of webbing strap that constitutes the main connection between inner membrane and outer . . . . .
55. . . . . . leaving us with a strap ready for later connection to the outer membrane.
56. We now need to get to the gas pipe connections to make a permanent seal with the inner membrane floor. Access is gained through an access tube welded to the inner membrane wall.
57. Inside the inner membrane, on the floor, a hole is cut through the membrane at the gas pipe position. This is simply done with a knife.
58. A stainless steel “backing ring” is then located over the cast-in gas pipe flange (which has threaded holes) . . . . .
59. . . . . . and holes are cut out of the membrane using a standard hole punch.
60. Finally the “backing ring” is installed with two gaskets and bolted up with stainless steel bolts, washers and sealant.
64. . . . . . and tucked into its own “envelope”, readily accessible if entry is ever required in future . . . . .
65. . . . . . and the envelope is finally laced up to secure the rolled up tube.
66. The target board for receiving the ultrasonic level measurement signal from the transducer to be located in the top of the outer membrane is now assembled . . . . .
67. . . . . . and connected securely to the top of the inner membrane by ropes tied through factory-welded tags.
68. A ballast ring is now assembled. This weight gives stability to the inner membrane and ensures a regular shape to the membrane during inflation and deflation.
69. The inner membrane is now complete, and work on the outer membrane can begin.
84. . . . . . and we can now enter the outer membrane, through the hatch, to see the membrane lifting away from the inner membrane, which is not yet attached to the outer.
85. The circumferential cable is threaded through the outer membrane eyelets, and the previously laced up connecting straps attached . . . . .
86. . . . . .and the gas leak detection pipe fitted.
87. The outer membrane can now be finally inflated to its working pressure, and the final adjustments made to the interconnecting straps.
92. Satisfied clients include Water and Waste Water Utility companies and contractors, worldwide. Our reference sites number over 100 projects in England, Wales, Scotland, Ireland, Isle of Wight, France, Poland, The Netherlands, Finland, Denmark, Cape Verde, Turkey, USA, British Virgin Islands, U.A.E. and Australia. We are constantly tendering on many other projects, worldwide. We specialise in flexible membrane structures for biogas, odour control, tank roofs and, and have developed a “tank-top” biogas option with our licensees in USA.
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