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86 512-8166609635，preliminary prefabrication and assembly analysis of lng atmospheric storage tank - doer equipment
classification：industry publishtime：2019-08-29 14:36:29
preliminary prefabrication and assembly analysis of lng atmospheric storage tank
for the groove processing of steel plate weld of lng atmospheric storage tank, the carbon steel plate can be cut by semi-automatic oxygen and acetylene flame, and the stainless steel plate can be cut by plasma. the groove processed shall be smooth without slag inclusion, delamination, crack, slag and other defects, and the surface hardener generated by heating shall be removed during cutting.
stainless steel materials should be processed by stainless steel special cutting and grinding, and the oxide film in non processing area should be well protected; chalky powder (lime water) shall be coated on both sides of plasma cutting and arc welding bead. the width of coating shall be 200 mm on both sides centered on the weld, so as to prevent spatter from polluting both sides of weld bead. the welding of middle and auxiliary plate and annular plate of bottom plate shall be carried out according to the drawing requirements.
draw the cross center line on the foundation, and then lay it from the web to the edge plate. after alignment, fix it with fixtures or spot welding. the bottom plate should be laid according to the semi-finished products and the layout diagram provided by the design, from the center of the tank bottom to the surrounding, and the first piece in the center position should be accurate, and there should be no vertical and horizontal axis rotation error, the horizontal error of the central axis shall not be greater than 2mm. after the central bottom plate is laid, the cross central line on the upper surface of the foundation shall be reversed to the upper surface of the outer tank bottom plate, and the center shall be found and marked clearly.
the bottom plate should be laid according to the layout drawing to ensure the welding size and position. the welding shrinkage should be reserved during the layout. the layout diameter of the tank bottom should be 0.1% larger than the design diameter.
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