The low fin tube is also called threaded tube, which increases the internal and external area of heat exchange without increasing the appearance volume, thus improving the efficiency of heat exchange. Suitable for various heat exchangers. Such as air conditioners, heat exchangers of various diesel engines and gasoline engines, heat exchange tubes and radiator tubes of thermal power plants and nuclear power plants, heating tubes of boilers (or water heaters), etc.
Fabrication Process
Different from high fin tube, low fin tube is also named integral fin tube or mono metal fin tubes. It is a tube where the external surface of the tube is enhanced by the process of finning and the fins are drawn from the base materials of the tube, resulting to increase in the surface area by 2.5-3 times higher than the plain tube area.
Material availability
Based on different operation environment, low fin tube is available on different raw materials, such as carbon steel, copper, copper alloy, stainless steel and titanium.
Specifications
D: Base Tube Outside Diameter
Di: Base Tube Inside Diameter
W: Plain Tube Wall Thickness
Fm: Fin Thickness
di: Inside Diameter under fin
dr: Root Diameter of Fin
Wf: Diameter of top fin
do: Fin OD
Fh: Fin Height
Material | Copper, Brass, Aluminum brass, copper-nickel, carbon steel, stainless steel |
Plain Tube OD | 9.52mm~38.1mm |
Tube Wall Thk | 0.50mm~4mm |
Fin Pitch | 19FPI, 26FPI, 28FPI, 30FPI, 36FPI, 43FPI |
Fin Thick | Appro 0.3mm |
Fin Height | 1.0mm~2.5mm |
Length | 25meters Max |
The (integral) low fin tube can be delivered in full finned on tube surface or with un-finned section gaps in middle of the tube. Besides, the integral lwo fin tube can also be bent either with fin or without fin according to customer’s requirement.
Test Done on integral low fin tube
After finning services, each tube will have air pneumatic test on hydro test on leakage and macro test as order designed specifications.
The inner and outer spiral pipe is mainly to make the pipe into the same spiral body inside and outside the pipe, so that the heat source body in the pipe rotates under the action of the pipe spiral body, so that the heat source body can perform sufficient heat exchange, and the cooling body outside the pipe will also work under the action of the spiral body The rotation around the pipeline occurs below, so that the cooling body can be fully cooled. In addition, the spiral body is also a heat exchanging body, so the efficiency of the heat exchanger can be improved. The manufacturing structure is simple.
Package
For short length of low fin tube, it will be packaged in wooden case.
For long length of low fin tube, it will be packaged in strong welded frame with plywood case.
Application
The inner and outer helical tubes can be used in various types of heat exchangers, because the inner and outer helical structures have the same appearance size, the inner and outer heat exchange areas of the inner and outer helical tubes are larger, so the heat exchange efficiency is also greater.
If it is used in a boiler (or water heater), because the contact surface between the water on the inner surface of the heating tube and the tube wall is the heat exchange interface when the heating tube is heated, water vapor (steam) bubbles are formed after the water is heated, and the water vapor (steam) bubbles As the temperature rises, the water bubble will increase. When the buoyancy in the water vapor (steam) bubble is greater than the water pressure, the water vapor (steam) bubble will break away from the tube wall and float upward, and the water vapor (steam) bubble will leave the tube. The original position of the wall is replenished by new water. Repeat this until the fire is turned off. The floating of a large number of water vapor (steam) bubbles will form a water flow force, which will drive the water in the boiler to move downwards, so that the water in the boiler will be fully heated. This increases the rate at which the water is heated, thus increasing the efficiency of the heat exchange.
Low-finned copper tubes are mainly used in condensers and evaporators in air-conditioning and refrigeration equipment, absorption refrigerators, oil coolers and various other heat exchangers; they are used in condensers in heat exchangers in thermal power plants and nuclear power plants and evaporators, condensers and evaporators in marine exchangers; various heat exchangers in air coolers, diesel coolers, secondary coolers and waste heat recovery systems used in gas turbine units and petroleum industry, chemical industry Dryers and heaters used.
