Pressure testing method for small diameter open-mouth connecting pipe of pressure vessel

Abstract

The invention discloses a pressure testing method for a small-diameter open-mouth connecting pipe of a pressure vessel, belongs to the field of pressure vessel manufacturing, and solves the difficultyof use of a die for stamping a pressure testing end socket of a small-diameter thick-walled connecting pipe. The pressure testing method is as follows: according to the pressure requirements of equipment pressure testing, the thickness and related dimensions required for the pressure testing end socket are calculated by special calculation software; according to the calculated dimensions, a pressure test tool (1) is directly processed by a lathe; a remaining sheet material in the manufacturing process of the pressure vessel is used as a material for the pressure test tool (1), the thickness of the sheet material is greater than the height of the required pressure testing end socket; the pressure test tool (1) is welded to an open nozzle (2) of the pressure vessel, and is used for flaw detection of attachment welds; after the flaw detection is qualified, pressure resistance tests of the pressure vessel are carried out according to operating procedures. The method does not need the dieto stamp the pressure test tool of the small-diameter open-mouth connecting pipe, waste is utilized, and the method is green and environmentally-friendly, and also ensures the same material. The pressure testing method is suitable for the pressure testing of the small-diameter thick-walled open-mouth connecting pipe, in particular, the open-ended connecting pipe with the inner diameter of phi lessthan or equal to 300 mm, of the pressure vessel.

Description

Technical field [0001] The invention belongs to the field of pressure vessel manufacturing, in particular to pressure testing of small-diameter open joints of pressure vessels. Background technique [0002] After the pressure vessel is manufactured, a pressure test is required. Many pressure vessels have open nozzles. For these open nozzles, certain measures must be taken to make the container reach a closed state before the pressure test can be carried out. For these open nozzles, the pressure vessel manufacturer often adopts the method of welding the pressure test head to make the vessel reach a closed state. The conventional way to manufacture pressure test heads is to punch them with a mold. However, for small-diameter thick-walled pipes, especially open pipes with an inner diameter of Φ≤300mm, it is difficult to press and test the head with a mold, and the forming size is not easy to control, and the same material as the pressure vessel must be selected. Contents o...

AI Technical Summary

Problems solved by technology

However, for small-diameter thick-walled pipes, especially open-ended pipes with an inner diameter of Φ≤300mm, it is difficult to press and test the head with a mold, and the forming size is not easy to control, and the same material as the pressure vessel must be selected.

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