Method for searching for leaked tube of tube nest heat exchanger

Abstract

The invention provides a method for searching for a leaked tube of a tube nest heat exchanger. The method comprises the steps that: S1, an alkaline solution is injected into a shell pass of the tube nest heat exchanger; S2, the alkaline solution is pressurized through a hydrostatic test pump, degreasing cotton balls soaked with a phenolphthalein reagent is wound and bound with stainless steel wires, the degreasing cotton balls are stuffed into tube nests, and the degreasing cotton balls are pulled back and forth in the tube nests; and S3, if the degreasing cotton balls become red, it is indicated that a corresponding tube nest leaks, and the tube nest is sealed by adopting stainless steel cylinders with the same caliber in a full welding manner. Two substances are adopted, the specific leaked tube nest can be conveniently found out, cost is low, operation is convenient, and safety and reliability are achieved.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a method for finding leaking tubes of a tube heat exchanger. Background technique [0002] The structure of the tube-and-tube heat exchanger is very simple and compact, and the cost is relatively cheap. The tube wall is generally thin (0.1mm), and the heat exchange effect is good. The wall of the tube is thin, and after a long time of use, individual tubes will leak, which will affect the product quality; due to the large number of tubes and dense arrangement, some tubes have small diameters. It is difficult to identify and find the specific pipe when there is a slight leak in the pipe. [0003] Most manufacturers use water or nitrogen gas leak test method. Although it can prove that the tube has leaked, when there are small cracks inside the tube with a small diameter, radiographic flaw detection cannot be carried out, and it is difficult to find the specific one. tu...

AI Technical Summary

Problems solved by technology

[0002] The structure of the tube-and-tube heat exchanger is very simple and compact, and the cost is relatively cheap. The tube wall is generally thin (0.1mm), and the heat exchange effect is good. The wall of the tube is thin, and after a long time of use, individual tubes will leak, which will affect the product quality; due to the large number of tubes and dense arrangement, some tubes have small diameters. It is difficult to identify and find the specific pipe when there is a slight leak in the pipe

[0003] Most manufacturers use water or nitrogen gas leak test method. Although it can prove that the tube has leaked, when there are small cracks inside the tube with a small diameter, radiographic flaw detection cannot be carried out, and it is difficult to find the specific one. Tube

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