To put heat where customer bending and factory bending details Triangular CrossSectionspecially designed for high element surface Triangulation 151or in high surface temperature air heating E He ID: 200407
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Tubular HeatersDesign Considerationsoutlined in Technical section. For assistance, must be checked against the curves in Technithan stipulated by the curve, consider these to obtain the required kW capacity. Watt Densities — heat transferability. It can be higher for heating air, metals, liquids and other heat-conducting materials. See curves in Technical section for ture. Watt density is given in the speci cations for each tubular heater.conductivity requires a low watt density. conductivity. Premature loss of the element material’s heat-take-away ability is low. Also, Terminal Selection —shipped with standard terminals, see Terminal order.other processes, moisture, weather, etc. MgO Vacuums — Tubular heaters operate at higher lower. It is recommended terminals of the eleAssociation (CSA), Underwriters Laboratories Inc. (UL) and Veri cation of Devices forEurope Testing and Certi cation Institute Installation Guidelinesto use the correct wire gauge to carry the To put heat where customer bending and factory bending details. Triangular Cross-Sectionspecially designed for high element surface Triangulation —or in high surface temperature air heating. E Heated LengthBCDFEFGG Terminal InsulationA TerminalCopper, Steel or INCOLOY Components Tubular HeatersCompression FittingsAvailable in both brass and steel, these ttings terminal Type #26 (Hermetic Seal), and some other terminals wider than sheath diameter.Brackets, Discs & ClipsVarious types Customer Bendingsheaths are selected, specify “To be fully around any round, smooth surface of the right diameter.Three precuations should be observed to as shown in the table below. End of cold section of the element should 1/4" of either side of the bend. To locate To locate end of cold section Total cold length: 6-7/8" Cold length of each end Terminal end bending can be done with pipe To protect sheath, copper Flange - Support0.315" ElementFlange - Support0.475" Element 4-1/2"3-3/8"4-1/2"3-3/8"3/4"1-7/16"1-15/16"31/32"3/4"1-1/2"1-15/16"31/32" DiscClip-AnchorElements are on 1" Dia. Bolt Circle5/32"7/16" 1-1/2" O.D. WasherTank Wall CompressionNut Terminal End End of Heated Section Must Not Be Within These Two Pointsat Terminal End Max. WallToSpecify PCN, material, element diameter and quantity. Available in pairs only.Available only in brass and steel at this time. Customer Bending — Min. Inside Radius (In.)SheathMaterialDegreeof Bend1/2"0.475"0.430"3/8"0.375"0.315"0.26"0.246"0.2"Copper901803-1/21-1/21-5/162-5/161-1/815/167/83/4Not Std. Steel902-1/21-1/21-5/161-7/81-1/815/167/83/4Alloy902-1/21-1/21-5/161-7/81-1/815/167/83/45/81.For radii smaller than shown, special processing is required to achieve good life Components A-11 Tubular HeatersTerminal Options 48 \r\f \f\n\t\r\b\t\t\f\b \t \n\b\t\f\b\f 49/50 \r\b\t\f\t\b\f\n\b \b\f\r\f€‚ƒ„\r\b\t\f\f\t\b\t\f\r\b\f \t \f\t… €\f † \f €\f \f ‡53 ˆ\f \b\f\n\f\t ‰ Š \f\n Alternate Terminals (cont’d.)38 \f \f €\f \f\n\t\r47-L ‹\r\f \f\r\b\t\f\r\f\fŒ\t47-M ‹\r\f \f\r\b\t\f\r\f\fŒ\t 39/40 Ž€† Š\n \f\n … €\f†‡‚ƒ„ Š\n \f\n … €\f ‡42 \r\b\t\f\f \f ‚ƒ„\f\r\t \t\r\f\f\t \t\r€ Moisture Resistant Terminals Note: ƒ€\f \f\t\r€‘\f\n\f \b\f\r\r\r \f\f’\f 13 Ž“”•\fŒ\r\b\t–\f \f \t \r\f \f\n \f\n —Š26 ‘\f\n\f \b\f\r Š\n \f\r\f\n\f\t \f\n 39/40 Ž€† Š\n \f\n … €\f†‡‚ƒ„ Š\n \f\n … €\f ‡ 2 0.375" Dia. and LargerSheath Dia. Per TabSheath Dia. Per Tab2-1/8SiliconeRubber Boot141/216 Gauge Lead Wire1-7/83/41-7/80.43" Dia.and Larger 0.315" Dia. and Smaller1-3/415/320.375" Dia.and Smaller#10-321/4-28 Sheath Dia. Per Tab1-5/8ADia. (In.)A0.3153/0.3751/0.43, 0.4759/16 SheathDia.Max.TypeDescription(In.)Volts SheathDia.Max.TypeDescription(In.)Volts 1-3/4121/2 1-3/4121/2 Sheath Dia. Per Tab1/4 7/85/16 Silicone Bushing13/32Ceramic Spacer7/87/16 1-1/8Sheath Dia. Per TabCeramic Bushing#10-32 1SheathDia. Per TabCeramic Bushing1/13/32#10-32#8-32Ceramic BushingSheath Dia.Per Tab13/161/41/45/16 „\f\r… ˜Š‡„\f\r“\r…† ˜Š‡\f\r…\f \n ‡‚˜\f\r… ˜Š‡ ˜Š‡VVPA Standard, Alternate and Moisture Resistant Terminals Components TUBULAR Tubular HeatersTerminal OptionsStandard, Alternate and Moisture Resistant Terminals 280.2462400.252400.26240Welded on threaded pin (#8-32), nuand washe340.2240Leadwire with sleeving, #6 ConnectorSTRI0.315240STRS/0.475480STRCSingle-end tubular termination, 10leadwire30All240Ark-LesR Connector30RAll240Right-angle Ark-LesR Connector370.3152400.3752400.434800.475480Extra mechanical strength# 8-32 thread 1/4Sheath Dia.Per Tab3/4 Standard Terminals30.3154800.3754800.434800.475480Welded on threaded pin (#10-32), nutand washer40.434800.4754800.5480Threaded terminal pin (#8-32), nutand washer80.2462400.252400.262400.3152400.3752400.432400.475240Terminal connector - 5/16" long, #10-32machine screw Alternate Terminals230.436000.4756000.5600Threaded terminal pin (#8-32), nutand washer240.436000.4756000.5600Threaded terminal pin (#8-32), nutand washer250.2462400.252400.262400.3152400.3752400.432400.4752405/16" Long #10-32 Bolt with nut SheathDia.Max.TypeDescription(In.)Volts SheathDia.Max.TypeDescription(In.)Volt 3/4 Sheath Dia. Per Tab11/4 MicaSheath Dia. Per Tab Sheath Dia. Per Tab1/4Sheath Dia. Per Tab11/4 Mica 3/ Mica Sheath Dia.Per Tab 1/ 1/4 3/ Mica 3/4 Sheath Dia.Per Tab1/4 1/ Sheath Dia. Per Tab Mica 1/4Sheath Dia. Per Tab 1/ 3/43/41 Components A-9 A-9 B OAL = 2L OAL = 2L2 + 2H - A - 2.28R1 - 0.86R2 - 3.29Dia. Figure 16 Figure 5 Figure 11 Figure 12Tubular Heaters OAL = 2H + 0.86RFigure 7 OAL = 0.0175(.)(2D/2 + Dia.) + 1.14R + 0.43Dia. Figure 8 OAL = [(D + Dia.)(3.14)(Number of 360°’s)] + 2C Figure 13 L1L2R1B1CAR2Dia. Figure 15 B2 OAL = 2H + 2L Figure 9 R2 R1AB2B1L1L2OAL = 2L1 + 2.28R2 - 1.29Dia. + 2L2 + 1.14R1 Figure 10 Figure 14OAL = [(D + Dia.)(3.14)(No. 360°’s)] + (D/2) + K + C OAL = 2H + 0.86R3 - 3.72Dia. + 2L1 + 2L2 + 2.28R1 + 1.14R2 Dia.BR3CHL2 L1R1B2R2B1R1A Figure 6 R1 R1H R2 B2R2R3Dia.L1X = No. Outside HairpinsL2L3R4AB1R1CCI Components TUBULAR A-8 Tubular Heaters OAL = 2L2 + 1.14R1 - 1.29" Dia. + 2L1 + 1.14R2 L1L2AB1B2Dia.R1R2R1 Dia.R2ALBHR1OAL = 2H - 0.86R2 - 2.86" Dia. + 2A + 1.14R1 OAL = 2L + 1.14R - 0.43" Dia. Dia.BARLDia.ALROAL = 2L - 0.86R - 1.43" Dia. + A Figure 1Figure 2Figure 3Figure 4Factory Minimum Bends for Tubular Heaters To Specify model, PCN, volts, watts, special features, if required, and quantity.Tubulars:Figure number.D. MaterialF. Position1. Theseonly. are2. A3. CHeart Shaped cross-section only. Note— OAL represents overall length.C Components A-7 Factory BendingTighter bends can be made at the factory.Tubular heaters can be formed to many dif Tubular HeatersWorld Leader in the Manufacture of Electric Triangularbending is performed in the eld.Triangular Cross Section —Triangulated Cross Section —ef cient heat transfer, fewer elements since Voltage or Wattage — practical limits. For voltages higher than 480V, See Component section Tubular Heater (0.475 Special Wattage Distribution —Tubing —Tubulars can be bent to tighter radii at the factory. Bends are then radii does not require repressing. (See Factory Terminal Construction — Tubular elements generterminal end seal. Terminal end seals can be Available steel, copper, INCONEL Max. Wall Gasket Washer Threaded FittingsWelded or Element Dia. (In.)Max. HeaterLength (Ft. ± 1%)0.2100.246400.375400.315400.43400.475513/817±1/8"1/217±1/8 Single-end elements have a Steel Washer Components TUBULAR