| abstract |
855,520. Storing liquefied gases. CONCH INTERNATIONAL METHANE Ltd., [formerly CONSTOCK INTERNATIONAL METHANE Ltd.]. July 1, 1959 [July 9, 1958(2)], No. 22632/59. Class 8(2). A liquefied gas storage tank 10, Fig. 1, is built of rectangular heat insulation panels 28 lined by a liquid impervious cup-shaped member 62 resting on the base of the shell and having its sides supported against collapse by vertically spaced horizontally extending spiders 96, 98 and cables 110, 112. Vertical wooden external reinforcing ribs 16, Fig. 2, have their ends 24 engaged in upper and lower wooden rings 14 and are bolted at intermediate points to vertical planks 36, Fig. 3, which are in turn bolted at 42 to adjacent panels 28. The lining 62 comprises a bottom plate 64 of metal plastic or glass fibre and side plates 66 having overlapping edges 80, 78, Fig. 5, projecting into the storage chamber 30 over a wooden insert 83 set in the bottom panel 28. Adjacent edges 68, 70, Fig. 4, of side plates 66 similarly overlap and form expansion joints held against creep by wooden keys 74 set in the panels 28. The upper spider 96 comprises wooden inner and outer rings 100, 102 connected together by wooden radial arms 104. The inner ring 100 is supported by steel cables 110 whilst the outer ring 102 presses against the lower face of a flanged steel ring 86. bolted to the insulation panels 28 and serving to support the upper edge of the uppermost plates 66 of the lining 62. The lower spiders 98 have upwardly directed radial arms connecting inner and outer rings the latter being supported by cables 112 connected to the flanged ring 86. A displaceable core 126 in the uppermost panel 28 allows for pressure relief. In a modification a base panel 218, Fig. 8, is splined to side panels 228 in which are inserted hardwood portions 248 and around which are located steel retaining bands 246. Prevention of collapse of lining 262 is effected by horizontal wooden rings 282 connected together by vertical wooden columns 284 and crossbraces 290 ; each of the rings 282 having a groove 286, Fig. 11, loosely engaged by an inwardly projecting flange of a steel ring 276 rigidly connected to adjacent edges of lining plates 266. The latter have corrugations 278 to allow of thermal expansion. |