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86 512-8166609636，analysis on bottom assembly of lng atmospheric storage tank - doer equipment
classification：industry publishtime：2019-08-30 15:14:19
analysis on bottom assembly of lng atmospheric storage tank
according to the installation sequence of lng atmospheric storage tank, before the installation of the bottom plate, the lower surface of the bottom plate shall be protected against corrosion (the space within the overlapping range is 50 mm without brushing).
before the laying of the bottom plate, the vertical and horizontal cross center lines shall be drawn on the surface on the basis of the acceptance. when the deviation of the center line marked by the civil engineering is large (but within the allowable range), it shall be adjusted to the minimum. the laying of the bottom plate shall be carried out from the center of the tank bottom to the surrounding according to the layout. first of all, lay a piece in the central position, its position should be accurate, there should be no vertical and horizontal axis rotation error, the horizontal error of the central axis should not be greater than 2mm, after the central bottom plate is paved, reverse the cross center line on the foundation surface to the bottom plate surface, find out the center, and make an obvious mark.
the base plate shall be fixed by positioning welding and fixture. during positioning welding, the welding material shall be the same as the formal welding, and the arc striking and arc extinguishing shall be in the groove or on the weld bead. the length of each welding section should not be less than 50 mm.
for the bottom plate of arched edge plate, the middle plate should be lapped above the arched edge plate. when laying the slab, the lap width required by the design shall be 40mm, and the allowable deviation shall be ± 5mm. the maximum gap between the two plates at the lap joint shall not be greater than 1mm. at the overlap of the three layers of bottom plate, the corner width of the upper layer of bottom plate shall be 2 times of the lap length, and its width shall be 2 / 3 times of the lap length, the "tortoise shell joint" between the middle plate and the side plate shall be welded after the installation of the bottom wall plate.
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