Finned Tubular Heaters

PRODUCT DESCRIPTION

Finned Tubular Heaters are normally used in forced circulation heating of low temperature air, other atmospheres and gases. Typical applications include forced convection heating of air, process atmospheres, and oven atmospheres in duct environments. Steel finned tubular heaters are standard with surface temperatures limited to about 425�C (797�F) compared to 815�C (1500�F) for an alloy sheathed non-finned heater.

Some applications require stainless steel materials for corrosion resistance. The most efficient finned heaters are made with steel sheath and steel fins. Steel is normally used for air heating, stainless steel for atmospheres which are humid or corrosive and monel for salt-laden humid atmospheres. Keep in mind that stainless heaters with stainless fins are very inefficient since the heat transfer rate of stainless is less than one quarter that for steel.

Finned Tubular Heaters offer distinct advantages over open coil heaters: (a) they are safer to operate in that the risk of fire or electrical shock are minimized; (b) they have a much longer service life; and (c) they are more rugged requiring less maintenance than open coil heaters.

We offer a standard carbon steel construction and a high temperature/ corrosion resistant stainless steel construction. As with regular tubular elements, they can be bent to a number of shapes and are available with fittings and mounting brackets as required.

Finned Tubular Heater Specifications.pdf

Tubular Heater Bend Formations.pdf

Electric Tubular Heaters Wiring Diagrams

Typical Applications

Radiant Heating

Convection - Air and Gas

Recirculation Ovens

Shrink Tunnels

Dryers

Heat Treating

Annealing

Wattage Required to Heat Air Flows:

http://www.nphheaters.com/quote/industrial_process_heaters/wattage_required.pdf

To Order Finned Tubular Heaters Please Specify:

Element diameter andsheath material

Fin Material

Terminal Type

Total Sheath Length

Cold Section at Each End

Voltage and Wattage

Bending Configuration Drawings-see link below:

Quantity

Mounting Characteristics and accessories (if required)

Special Moisture Resistant Seal (if required)

Bending Formation Drawings – See link below:

Bend Formations Below:

NPH Tubular Heater Bend Formations.pdf

How To Order Finned Heaters

Finned Tubular Element:1	Figure 1 - 0.315" kw L part no. 1 2 3 4 5 6   19 34 49 64 79 94   ASB-301S ASB-302S ASB-303S ASB-304S ASB-305S ASB-306S   nominal dimensions F = 5/8" Figure 1 - 0.430" kw L part no. 2 3 4 5 6 7 8 27 39 52 64 77 89 102 ASB-402S ASB-403S ASB-404S ASB-405S ASB-406S ASB-407S ASB-408S nominal dimensions F = 5/8"
Finned Tubular Element:2	Figure 2 - 0.315" kw L part no. 1 2 3 4 5 6     19 16 24 31 39 46     ASB-301U-A ASB-302U-A ASB-303U-A ASB-304U-A ASB-305U-A ASB-306U-A     nominal dimensions C = 2 1/2" F=5/8" R = 1  9/16" W = 3 3/8" Figure 2 - 0.430" kw L part no. 2 3 4 5 6 7 8 13 20 26 32 38 44 51 ASB-402U-A ASB-403U-A ASB-404U-A ASB-405U-A ASB-406U-A ASB-407U-A ASB-408U-A nominal dimensions C = 3" F=5/8" R =  2" W=4"
Finned Tubular Element:3	Figure 3 - 0.315" kw L part no. 1 2 3 4 5 6 6 10 13 17 20 24 ASB-301W ASB-302W ASB-303W ASB-304W ASB-305W ASB-306W nominal dimensions A=L-F C=4½" F=5/8" W=5½" Figure 3 - 0.430" kw L part no. 2 3 4 5 6 7 8 7 10 14 17 20 23 26 ASB-402W ASB-403W ASB-404W ASB-405W ASB-406W ASB-407W ASB-408W nominal dimensions A=L-F C=6" F=5/8" W=7 1/8"
Finned Tubular Element:4	Figure 4 - 0.315" kw L part no. 1 2 3 4 5 6   20.5 35.5 50.5 65.5 80.5 95.5   ASB-301SF ASB-302SF ASB-303SF ASB-304SF ASB-305SF ASB-306SF   nominal dimensions F=2 1/8" Figure 4 - 0.430" kw L part no. 2 3 4 5 6 7 8 28.5 40.5 53.5 65.5 78.5 90.5 103.5 ASB-402SF ASB-403SF ASB-404SF ASB-405SF ASB-406SF ASB-407SF ASB-408SF nominal dimensions F=2 1/8"
Finned Tubular Element:5	Figure 5 - 0.315" kw L part no. 1 2 3 4 5 6   10.5 17.5 25.5 32.5 40.5 47.5   ASB-301UF ASB-302UF ASB-303UF ASB-304UF ASB-305UF ASB-306UF   nominal dimensions C=1½" F=2 1/8" W=2½" Figure 5 - 0.430" kw L part no. 2 3 4 5 6 7 8 14.5 21.56 27.5 33.5 39.5 45.5 52.5 ASB-402UF ASB-403UF ASB-404UF ASB-405UF ASB-406UF ASB-407UF ASB-408UF nominal dimensions C=2" F=2 1/8" W=3 1/8"
Finned Tubular Element:6	Figure 6 - 0.315" kw L part no. 1 2 3 4 5 6   7.5 11.5 14.5 18.5 21.5 25.5   ASB-301WF ASB-302WF ASB-303WF ASB-304WF ASB-305WF ASB-306WF   nominal dimensions A=L-F C=4½" F=2 1/8" W=5" Figure 6 - 0.430" kw L part no. 2 3 4 5 6 7 8 8.5 11.5 15.5 18.5 21.5 24.5 27.5 ASB-402WF ASB-403WF ASB-404WF ASB-405WF ASB-406WF ASB-407WF ASB-408WF nominal dimensions A=L-F C=6" F=2 1/8" W=7 1/8"