How is the thickness of the heat exchange tubes determined? For example, 2mm or 2.5mm

This requires careful calculation based on the actual operating conditions, including temperature, pressure, heat exchange area, corrosivity of the medium, material of the heat exchanger, and heat exchange efficiency. Although there is some empirical data available for reference, decisions are not made arbitrarily; however, for specific projects or in terms of safety, there is a certain allowable range for the thickness of the materials used in equipment.

This is generally only related to corrosion and abrasion; the strength calculation for heat exchange tubes is very straightforward. Also, in order to reduce costs, the client will specify a certain thickness for you

It needs to be calculated based on a series of factors such as pressure, corrosion rate, and the design service life of the equipment.

1. Strength； 2. Corrosion condition? 3. Comprehensive material properties ；

Do not be misled; it’s not something that is calculated – they are simply the commonly used specifications. In China, no special requirements exist, so these two thicknesses are the ones used

The wall thickness is certainly related to pressure; however, under normal manufacturing conditions the pressure isn’t extremely high, so a standard wall thickness is sufficient. For pipes that comply with GB24593 standards and have a wall thickness of around 1.2, the hydrostatic test pressure before leaving the factory is 64 kilograms! In special cases, it is necessary to contact the manufacturer of the heat exchange tubes to determine the appropriate wall thickness Then one must consider the issue of corrosion, as well as the technical service life and the corrosion rate. For example, if the calculated thickness of the heat exchange tubes is 1.2, and the equipment lifespan specified in the project requirements is no less than 10 years with an average annual corrosion rate of 0.01 mm/year, then the wall thickness of these tubes must be at least 1.2 + 10*0.01 = 1.3!

Generally speaking, the thinner it is, the higher the heat transfer rate; however, the thinner it is, the shorter its service life – all this, of course, under the condition that the design parameters are met

For high pressures, calculations are necessary, taking into account factors such as the corrosion allowance for the inner and outer tubes, service life, thickness reduction, heat transfer efficiency, and cost-effectiveness. For important heat exchangers, these parameters are usually specified.

To be honest, if it’s about regulation... generally, the common thicknesses are chosen, unless you have specific reasons to opt for a thinner or thicker thickness. As for corrosion... it depends on the corrosion characteristics of the fluid at that temperature, which determines which material to use (in this case, the choice of material is much more important than the thickness)