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Air Preheater Tubes

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Air Preheater tubes are essentially a type of Heat exchanger tubes use for the purpose of heating air which is further used in other applications like Boilers, Dryers etc. An air preheater (APH) is a general term used to describe any device designed to heat air before another process (for example, combustion in a boiler ) with the primary objective of increasing the thermal efficiency of the process . The air passing through the Air Pre Heater is heated by allowing the air to flow on the Outer Surface of the tubes which have a highly heated fluid flowing inside through them. The heat is exchanged over the surface of these tubes and which in turn raises the temperature of the Air flowing over it. The heat transfer can further be improved by use of finned tubes(increasing the contact surface area) .

Air preheater tubes are made from Cold Drawing process and are generally of Carbon Steel material. The application of these tubes is in an area where the tubes is not subjected to extremely high temperatures and pressures. Hence, the use of Carbon Steel tubes in applications for Air Preheater Tubes is generally preferable. There are various types of Air Preheaters; one of them widely used is Tubular Type Air Preheater. In this type of Air Preheater, straight tube bundles are used, which pass through the outlet ducting of the boiler and open at each end outside of the ducting, The hot furnace gases pass around the air preheater tubes, transferring heat from the exhaust gas to the air inside the preheater. Ambient air is forced by a fan through ducting at one end of the air preheater tubes and at other end the heated air from inside of the tubes emerges into another set of ducting, which carries it to the boiler furnace for combustion. There are other Heat Exchangers like Regenerative Heat Exchangers, Recuperators, economizers which also make use of Air preheater tubes (Heat Exchanger Tubes)

Air preheater tubes manufactured by seamless Tubes are finding more and more application now a days because of higher reliability in seamless process. The main standards and grade used to manufacture the Air Preheater tubes are as given below

Sr.NoSTANDARDAPPLICATION
1ASTM A 179 / ASME SA 179SEAMLESS COLD DRAWN LOW CABON STEEL HEAT EXCHNAGER , AIRPREHEATER AND CONDENSER TUBES
2ASTM A 192 / ASME SA 192SEAMLESS CARBON STEEL TUBES FOR BOILER SERVICES
3ASTM A 556 / ASME SA 556SEAMLESS COLD DRAWN CARBON STEEL FEED WATER HEATER, HEAT EXCHANGER AND AIPREHEATER TUBES.
4OTHER INTERNATIONAL STANDARDS USED FOR THE APPLICATION OF AIR PREHEATER TUBES INCLUDE EN 10305 , EN 10216 ETC.

We can manufacture seamless tubes which are equivalent to standards specifying welded tubes.

The air preheater tubes are generally straight tube bundles but may also employ the use of U tubes in the air preheater depending on the design data.

We hope to successfully cater to your any requirements for Seamless tubes for the applications like Air Pre Heater Tubes , Regenerative Heat Exchanger Tubes, Heat Exchanger Tubes, Economizer Tubes , Recuperator Tubes in both Straight and U Tubes form.

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