Large centrifugal compressor pressure testing shell and pressure testing method thereof

Abstract

The invention belongs to centrifugal compressor manufacturing field and particularly relates to a large centrifugal compressor pressure testing shell and a pressure testing method thereof. A lower shell is overturned for 180 degrees; tooling flanges are respectively installed on an air inlet and an air outlet of the lower shell and then high pressure valves are installed on the tooling flanges; after that, the lower shell is overturned for 180 degrees to restore and a sealing area and a pressure testing tool are installed; then, the lower shell is hung above a square box on a pressure testing site; an exhaust pipe is installed on one of the tooling flanges of the lower shell and the top end of the exhaust pipe is connected with a flexible rubber hose; finally, an upper shell is lifted and the upper shell and the lower shell are held tightly; the high pressure valves are opened to inject water into the shells to expel the air inside the shells constantly until the water comes out of the exhaust pipe; then the exhaust pipe is plugged by a plug screw, the high pressure valves are closed and a hydraulic test is conducted; and after the compressor is proved to be qualified by a pressure maintenance test, the high pressure valves are opened to drain the water. According to the invention, the shells of the compressor are separately hoisted and mounted to conduct the hydraulic test, so the problem of insufficient tonnage of a crane can be solved.

Description

technical field [0001] The invention belongs to the field of centrifugal compressor manufacture, in particular to a pressure test shell of a large centrifugal compressor and a pressure test method thereof. Background technique [0002] The manufacture of million-ton ethylene cracking gas centrifugal compressors represents the country's advanced level in the petrochemical field and equipment manufacturing industry, and it fills the gap in the country's domestic production of million-ton ethylene compressors in the petrochemical field. of high-tech. The unit of the million-ton ethylene cracking gas centrifugal compressor is composed of three units: high-pressure cylinder, medium-pressure cylinder and low-pressure cylinder, and the three units are all horizontally split structures. The casing of the compressor is welded with plates. Although the weld seam has undergone ultrasonic flaw detection, the medium gas used by the compressor in the working state is poisonous, harmful, ...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that the casing is overweight and cannot be turned over by the crane, the purpose of the present invention is to provide a pressure test casing of a large centrifugal compressor and a pressure test method thereof

The pressure test shell structure and pressure test method solve the problem that the shell exceeds the tonnage of the crane

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