1、 Definition and Classification

1. Basic concepts

Threaded finned tube is a type of enhanced heat transfer element that is machined with spiral protrusions or wrapped fins on the inner and outer walls of a pipeline through special processes. It is divided into two categories: internally threaded finned tube and externally threaded finned tube.

2. Core functions

By increasing the heat transfer area and enhancing fluid turbulence, the heat exchange efficiency is significantly improved.

2、 Structure and Manufacturing Process

Typical structure

Base pipe: seamless steel pipe;

Fin: Steel or aluminum strip wrapped in a spiral shape, with a fin height of 5-20mm and a pitch of 10-50mm.

3、 Performance advantages

1. Heat transfer efficiency

The internal thread design increases fluid turbulence by 30% -50%, and the heat transfer coefficient is 2-5 times higher than that of a light tube;

The energy efficiency of externally threaded finned tubes in condensers is improved by 20%.

2. Durability

High temperature resistance: Stainless steel base tube+high-frequency welded fins can withstand high temperatures of 800 ℃ for a long time;

Corrosion resistance: BFe10-1-1 alloy has a lifespan three times longer than ordinary carbon steel in chlorine containing media.

4、 Application scenarios

1. Industrial sector

Boiler system: Spiral finned tubes are used for economizers, increasing the efficiency of flue gas waste heat recovery by 40%;

Chemical reactor: Internal threaded finned tube enhances medium mixing and shortens reaction time by 15% -30%.

2. Civilian field

Central air conditioning: BFe10-1-1 externally threaded finned tube condenser, with a 25% increase in refrigeration efficiency;

Agricultural greenhouse heating: Steel pipes wrapped around aluminum finned tubes, with a heat dissipation area up to 8 times that of light pipes, saving 30% energy.

5、 Selection suggestions

1. High temperature and high pressure scenario: prioritize three roll oblique rolling integral stainless steel finned tubes;

2. Corrosive environment: Choose BFe10-1-1 alloy or 316L stainless steel material;

3. Low cost requirement: High frequency welded carbon steel finned tubes have the highest cost-effectiveness.

Through structural innovation and process upgrades, threaded finned tubes have become the core components of efficient heat exchange systems.