Assembly method for ensuring equipment overall coaxiality in pressure vessel for chemical industry

Abstract

The invention provides an assembly method for ensuring equipment overall coaxiality in a pressure vessel for chemical industry. At first, U-V-shaped grooves are processed at two ends of each tube sections to be assembled, and then reference surfaces are processed below V-shaped grooves of the U-V-shaped grooves on the inner wall of the tube sections, an axis of each tube section is simulated according to the reference surfaces of two ends of the tube section as measuring basis, and when tube sections are assembled, the axis of each tube section is located on the same straight line. According to the assembly method for ensuring equipment overall coaxiality in the pressure vessel for the chemical industry, defects of the prior art are overcome, overall coaxiality of the equipment can be ensured, assembly accuracy is improved, and product quality and manufacturing efficiency are guaranteed.

Description

technical field [0001] The invention relates to an assembly method for ensuring the overall coaxiality of equipment in a chemical pressure vessel, and belongs to the technical field of assembly of chemical pressure vessels. Background technique [0002] For large-scale tower equipment in chemical equipment, such as ammonia synthesis tower, methanol reactor, etc., due to the very high assembly requirements of the internal parts and the shell, the shell is relatively long, and the internal parts are generally hoisted into the shell as a whole In order to ensure that the internal parts and the shell can be installed in place accurately and smoothly, this puts forward high requirements on the overall coaxiality of the equipment shell. [0003] If the equipment shell adopts a forged welding structure, then the coaxiality of the shell is relatively easy to ensure; if the equipment shell adopts a plate welded structure, it is more difficult to ensure the coaxiality of the shell. F...

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Problems solved by technology

[0003] If the equipment casing adopts a forged welding structure, it is relatively easy to ensure the coaxiality of the casing; if the equipment casing adopts a plate welding structure, it is more difficult to ensure the coaxiality of the casing

For large-scale tower equipment with plate-welded structure, according to the traditional method, the coaxiality of the shell during the assembly process is controlled by measuring the amount of misalignment of the circular seam of the cylinder, which has low requirements for concentricity The equipment can meet the requirements, but it is difficult to meet the requirements for large-scale tower equipment with plate-welded structure

If it is found that the size is out of tolerance after the above method is assembled and welded, it can only be compensated by removing the weld seam and reassembling and welding. Not only the repair process is complicated, but the manufacturing cost will be greatly increased, and the manufacturing cycle of the product will also be extended. Affect delivery

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