PFTPL has developed and marketed 8, 11, 16, 19, 23, 26, 28 and 40 Fins per Inch (FPI) Tubes. The diameters of tubes finned are in the range of 3/8″ to 1-1/2″ OD, up to maximum length of 25 Meters.
Integral Low Fin tubing is kind of single metal fin tube, which is a type of extruded tubing that consists of low fins. The low fin tube is very similar to the extruded “high fin” types. The external surface of the tube is increased by the formation of low fins by direct extrusion from the material of the base tube. Integral low fin tube for use in situations where extended surface is required, but lack of space or heat exchanger type dictates otherwise.
Low Fin Enhanced tubes can be used in standard & helical shell and tube baffles and tube sheets. The primary advantage for the low fin tube is providing surface enhancement and better heat transfer over smooth tubing.
Low finned tubes have been successfully used for controlling the temperature of gases and liquids or for evaporating and condensing refrigerants. As mentioned before, due to their enlarged heat transfer surfaces, they provide a considerable potential for savings by reducing the tube length that is needed to achieve the required performance of the unit.
Integral Low Fin Tube has the advantage that it can improve the thermal performance of a heat exchanger without the necessity for changing shell size, flow arrangement or the repositioning of piping.
Typical tube materials are Admiralty Brass, Copper, Copper Nickel, Carbon Alloy Steel, Aluminium Brass, Stainless Steel, Hastelloy and Titanium.
We can supply U-bend fin tubes, manufactured according to various heat exchanger standard or to customer’s own specifications. U-bend cold drawn seamless fin tubes for heat exchangers are widely used in chemical, petrochemical and energy plants. The bend area can be subject to stress relieving heat treatment by joule effect in inert atmosphere.
Dimensions and lengths
Tubes with the following external diameters in mm can be bend :
15.88 mm – 19.05 mm – 25.40 mm
The minimum feasible radius is :1.5 x external diameter of tube.
The maximum feasible radius is 830 mm.
Tolerances
Tolerances (diameter and wall thickness) according to ASTM A 556
Minimum wall thickness tolerances in the bend area conforming to the TEMA standard “Class R heat exchangers” can be requested or in accordance with specific requests.
We manufacture corrugated tube by using a special process, where outer and inner surfaces are given spiral-shaped rotating impressions which equips corrugated tube with excellent thermal properties. These corrugated tubes have greater heat transfer to the inner side of the tube and allow for better condensation run-off.
When you hear “CORRUGATED TUBES” a clear picture of “Convoluted Tube” will come in front of you.
Unlike in a plain tube Heat Exchanger, where the tube side media will have a straight flow, in the Corrugated Tube Heat Exchanger, the tube side media will have a turbulated flow, thereby increasing the heat transfer co-efficient.
Of course, due to turbulent flow, the fouling effect will be enormously reduced, caused by corrugated profile, in comparison with that of plain tubes. It also ensures uniform temperature distribution.
This Corrugated Heat Exchanger Tube has smooth and uniform spiral projection, both inside and outside tube surface.
During the process of Corrugation, no material is being removed, hence no thinning of tube wall occurs. Various Corrugation Profile can be made such as helix angle, depth, pitch and length, depending upon the specific application.
Due to increase in turbulence and uniform mixing both shell side and tube side media, the heat transfer is increased, thereby reducing the overall surface area required. As a result, the overall size of the heat exchanger can be considerably reduced, thereby saving precious space.
Corrugated tubes give the best effects of both plain tube and plate type of heat exchanger.
Corrugated tubes have wide and variety of application such as absorption type Refrigerator, Turbo Refrigerators and Screen Refrigerators Distillation Facility with multiple effects, for various effluent water, Dye-house effluent, Digestion Sludge, Pet Food, Grain Slurry, Fruit Pulps, etc.
Heating and/or Cooling of ethanol, glycol, isopropyl alcohol, toluene, benzene, heavy fuel oil, mineral and synthetic oils, slurries, resins, emulsions, fatty acids, glycerin, orimulsions, solvents, latese effluents.
Outside diameter of plain ends : 9.52 mm~100 mm
Thickness of plain ends: 0.5 mm~3.0 mm
Corrugation Pitch: 1.00 mm~15.00 mm
Corrugation Depth: 0.2 mm~1.2 mm
Number of threads: 1~3
Length: 500 mm~10000 mm
Features
1. Corrugated tubes are supplied with deburred ends, smooth operation
2. Non-fouling, non-blockage, not dirty, smooth operation.
Applications
1. Widely used for fluid to fluid & gas to gas heat exchanger.
2. Air conditioning heat exchangers and chiller units.
Integral Fin Tube Coils are manufactured out of copper tubes. The tube out of which the Fin tube coils are manufactured are 15.875 mm and 19.05 mm OD with 11 FPI, 19 FPI & 26 FPI having 1.00 to 2.80 mm Fin Height.
We manufacture the coil having smallest inner diameter of 30 mm and the maximum diameter can be as big as 500 mm. These fin tube coils are available up to a maximum developed length of 8 Meters, with single tube start or double tube start of equal lengths. Copper Fin Tube Coils are available either in bare conditions on duly bright nickel plated to avoid direct contact of Sulphur Content (if any) in the Oil with Copper.
These fin tube coils find applications in Oil Coolers, Inter-Coolers, After-Coolers, Hydraulic Coolers, Air Blast Oil Coolers, Coolant Chillers, Heat Exchangers, Immersion Re-cooling Units, Refrigerated Oil Chilling Plants, etc.
Integral external fin tubes with various internal ridges are available in various metals like copper, carbon steel etc., all in Seamless Variety.
These low fin tubes with internal ridges are manufactured out of 15.875 mm & 19.05 mm OD with 19 FPI and 26 FPI external fins and internal ridges up to maximum length of 10 meters with any number of intermediate landings (plain portion) for baffle supports, in addition to side landings.
Low fin tubes with internal ridges was developed as a high-performance heat transfer tube for various freezing machines. By this, the inside fluid heat transfer capability is remarkably improved in comparison with the former smooth in-tube type tubes. By the effects multiplied mutually by the tube’s outside fins and inside spiral ridges a high coefficient for overall heat transfer has been obtained. These have contributed to the reduction in size of various freezing machines.
In comparison with conventional low-fin tubes, the inside heat transfer coefficient of low fin tubes with internal ridges was upgraded by more than two times, thus remarkably improving the overall heat transfer coefficient. It ensures improved performance irrespective of which side of the tube, inside or outside, the refrigerant flows. The pressure drop inside the tube is increased a little when compared to low-fin tubes.
End cross tubes or high-performance extended surface tubes are available in copper, cupro-nickel, carbon steel & stainless tubes. These tubes are extensively being used in vapour absorption chillers.
We supply end cross tubes with various internal ridges as per customer specification.
End cross tubes are manufactured out of:
12.70 mm, 15.875 mm, 19.05 mm OD tubes, out of wall thickness as low as 0.65 mm
