Common dimensions of heat exchange tubes in tubular heat exchangers

The heat exchange tubes of tubular heat exchangers generally use seamless steel pipes. In addition to plain tubes, various types of enhanced heat transfer tubes can also be used, such as finned tubes, spiral groove tubes, threaded tubes, etc. The material of heat exchange tubes is mainly selected based on process conditions and medium corrosiveness. Commonly used metal materials include carbon steel, low alloy steel, stainless steel, copper, copper nickel alloy, aluminum alloy, iron, etc; Non metallic materials include graphite, ceramics, polytetrafluoroethylene, etc.

The commonly used dimensions (outer wall X wall thickness) of heat exchange tubes in tubular heat exchangers are seamless steel pipes of p19mmX2mm, p25mmX2.5mm, 38mmX2.5mm, and stainless steel pipes of 25mm X2mm and 38mmX2.5mm. Standard pipe lengths include 1.5m, 2.0m, 3.0m, 4.5m, 6.0m, 9.0m, etc. The number, length, and diameter of pipes are determined by the heat transfer area of the heat exchanger, and the selected diameter and length should meet the specifications. Tubular heat exchangers generally use large diameter pipes for viscous or dirty fluids, while small diameter pipes are used for cleaner fluids.