Anti-deformation method of base plate of large-sized stainless steel tank in high-temperature environment

Abstract

An anti-deformation method of a base plate of a large-sized stainless steel tank in a high-temperature environment is characterized by comprising the following steps that a, before edge plates are welded, in order to reduce angle deformation of a butt weld seam, an anti-deformation portal clamp is adopted after assembling spot welding, wherein the portal clamp comprises right-angled-n-shaped smallportal frames (1) and a right-angled-n-shaped large portal frame (2); and b, in order to prevent welding deformation generated during welding of the inner side and outer side of a large-fillet weld seam of a tank bottom, before welding, rigid fixation must be conducted on the inner side and the outer side with a fixture or a tank wall assembling clamp, wherein the fixture comprises a first clamping plate (6) and a second clamping plate (8). The anti-deformation method of the base plate of the large-sized stainless steel tank in the high-temperature environment has the advantages that the feature that for base plate welding in the high-temperature, high-humidity and windy-sandy environments, the stress release time is longer than that of general welding is achieved; it is avoided that welding deformation is caused after stress release, the welding quality of the base plate of the tank is good, and the base plate smoothly passes the mutually combined and mutually complemented inspectionstandards of the ASME standards and the SABIC standards, the base plate of the tank is praised by an owner, and relevant manufacturing experience of petrochemical tanks is accumulated.

Description

technical field [0001] The invention relates to the welding of the bottom plate of a steel tank tank, in particular to a method for preventing deformation of the bottom plate of a large stainless steel tank tank in a high-temperature environment. Background technique [0002] Chinese patent CN102069307 B disclosed a method for welding the bottom plate of a large flat-bottomed storage tank on August 1, 2012, which includes the following steps: (1) prefabricating several medium-width plates, and laying several medium-width plates for flat butt joint or lapping After joining, the bottom plate of the circular flat-bottomed storage tank is formed, and the bottom plate seams between the adjacent middle plates are dislocated, and then the adjacent middle plates are spot welded and fixed; (2) Prefabricated several fan-shaped edge steel plates, and then The fan-shaped edge steel plate is tiled along the outer circle of the bottom plate of the flat-bottomed storage tank to form an ann...

AI Technical Summary

Problems solved by technology

However, this tank bottom installation method produces unevenness on the bottom plate of the tank, which affects the quality of the tank

[0004] According to "Control of Local Concave-Convex Out-of-Tolerance of Large Tank Bottom" (see Journal of Guangxi Institute of Technology, Qin Yaobang, Volume 14, Issue 4, December 2003), a tank bottom with an inner diameter of 14m and a height of 27m is disclosed. -32m vertical tank, although the plates with larger length and width are used, and the welding seams are symmetrically arranged around the center of the bottom plate, so that the welding heat is evenly distributed, but there is still a concave-convex deformation of the bottom plate after welding of 32-45mm

[0005] Therefore there are above-mentioned inconveniences and problems in the known large-scale tank bottom plate welding deformation

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