Heat Exchanger Quality Identification

heat exchanger is a device used to transfer heat from hot fluid to cold fluid to meet specified process requirements. It is an industrial application of convective heat transfer and heat conduction and is widely used in chemical, petroleum, power, food and many other industrial productions. The main function of the
heat exchanger is to realize heat exchange between two fluids. The hot fluid and the cold fluid are in contact through the pipe or plate structure, thereby realizing the process of transferring heat from the high-temperature fluid to the low-temperature fluid. This equipment plays an important role in refrigeration, heating, heat dissipation and energy recovery processes and is an indispensable part of industrial production.
In the case of heat exchanger quality appraisal, Zhongke Testing can provide heat exchanger quality appraisal services.

heat exchangers can be classified in different ways:
can be divided into three categories: partition type, hybrid type, and regenerative type (or regenerative type) according to its operation process;
can be divided into two categories: compact type and non-compact type according to the compactness of its surface.

GB/T 28712-2023 Heat exchanger type and basic parameters
GB/T 27698-2023 Heat exchanger and heat transfer element performance test method
GB/T 151-2014 Heat exchanger
GB/T 29466-2023 Plate heat exchanger unit
GB/T 29465-2023 Flange for floating head heat exchanger
GB/T 29463-2023 Gasket for shell and tube heat exchanger
GB/T 18816-2014 General technical conditions for marine heat exchangers
GB/T 23130-2008 Heat exchanger for room air conditioner
GB/T 28713-2023 Enhanced heat transfer tube for heat exchanger
GB/T 29464-2023 Two-phase flow jet heat exchanger
0GB/T 28719-2012 Rubber sealing gasket for plate heat exchanger
1GB/T 28413-2012 Welded steel pipe for boiler and heat exchanger
2GB/T 37572-2019 Copper and copper alloy strip for heat exchanger
3

A heat exchanger rupture occurred in an ammonia fertilizer factory.
was entrusted by the court to conduct an appraisal and analysis on "whether there are quality problems" in the heat exchanger involved.
appraisal analysis results:
The appraisal analysis expert group discussed the relevant information and on-site investigation of the heat exchanger involved in the case and made a comprehensive quality and technical analysis, and made the following suggestions and conclusions:
1. The design structure of the heat exchanger involved in the case is unreasonable.
The welding of the expansion joint and the lower tube plate and the lower cylinder and the lower tube plate is structurally discontinuous, resulting in a large stress concentration coefficient. Non-destructive testing cannot be performed here, and the welding quality cannot be guaranteed. The outer diameter of the lower cylinder of
2 and the heat exchanger involved in the case is of poor manufacturing quality. According to the drawing, the outer diameter of the lower cylinder should be 1124 mm, but the actual size is 1133 mm, an increase of 9mm. The only way is to force the end of the cylinder to bend inward (the maximum deviation is 8.5 mm), and then weld it flush with the edge of the tube plate, resulting in forced assembly.