Heater Catalog (Section) - Immersion Heaters - Watlow

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Immersion HeatersWATROD and FIREBAR ANSI FlangeImmersion HeatersOptions (Continued)Wattages and VoltagesWatlow routinely supplies flange immersion heaters with240 to 480VAC as well as wattages from 150 watts toone megawatt.Sheath MaterialsThe following sheath materials are available on WATRODand FIREBAR flange heaters:Standard Sheath MaterialsWATROD Alloy 800, 840316 SSSteelFIREBAR Alloy 800Exotic Sheath MaterialsContact your Watlow representative for details andavailability.External FinishingPassivationDuring the manufacturing process, particles of iron ortool steel may become embedded in the stainless steelor alloy sheath. If not removed, these particles maycorrode, produce rust spots and/or contaminate theprocess. For critical sheath applications, passivationwill remove free iron from the sheath. To order,specify passivation.Other FinishesBright annealing available to meet cosmetic demands.FlangesFlange Sizes and StylesStandard: 2 1 , 2 1 /2 1 , 3 to 48 inch ANSI raised face/blindflanges.Made-to-Order: 16, 18, 20 and 24 inch in anyrecognized configuration, as well as customer specified.Over 48 inch ANSI flange, contact your Watlowrepresentative.Flange MaterialsStandardPressure ClassesStandard1 ANSI bolt pattern onlyCarbon steel316 SS304 SS150 lb300 lb600 lbGasketsRubber, asbestos-free and spiral wound gaskets areavailable for all flange sizes. Order by specifying gaskettype, flange size/rating, process operating temperatureand pressure.To make the correct selection, see the Gasket Selectionchart. It provides a recommended gasket type andeffective temperature rating.To use this chart, multiply operating temperature by theoperating pressure to arrive at “Maximum PSIG x °F.”This is listed in the chart’s first column.Gasket SelectionGasketMaximum TemperaturePSIG x °F °F Gasket TypeUp to 15,000 300 RubberOver 250,000 700 Asbestos-FreeOver 250,000 3 Spiral Wound3 Depends on metal gasket material.240 WATLOW ®
Direction of FlowImmersion HeatersWATROD and FIREBAR ANSI FlangeImmersion HeatersOptions (Continued)BafflesDirection of FlowFor forced circulation applications, 316 stainless steelbaffles can be arranged on the heating element bundleto enhance and/or modify fluid or gas flow for betterheat transfer.For open tank or convection heating applications,standard element supports will be supplied.To order, specify baffles.ANSI Raised Face Blind Flange,150# Class DimensionsPipe SizeDiameterof BoltCircleDiameterof BoltHolesOutsideDiameterFlangeThickness3 7.50 0.94 6.00 0.75 44 9.00 0.94 7.50 0.75 85 10.00 0.94 8.50 0.88 86 11.00 1.00 9.50 0.88 88 13.50 1.12 11.75 0.88 810 16.00 1.19 14.25 1.00 1212 19.00 1.25 17.00 1.00 1214 21.00 1.38 18.75 1.12 1216 23.50 1.44 21.25 1.12 1618 25.00 1.56 22.75 1.25 1620 27.50 1.69 25.00 1.25 2024 32.00 1.88 29.50 1.38 20Number ofBolt HolesApplication Hints• Select the recommended heating element sheathmaterial and watt density for the substance beingheated. Use the Supplemental Applications Chart onpages 555 to 560. If unable to determine the correctheating element sheath material and type, contact yourWatlow representative.• Extend the element no-heat section completely intothe fluid being heated to help prevent premature heaterfailure. See accompanying illustration for properno-heat section placement.• Locate flange heater low in the tank, but above thesludge level.• Choose a FIREBAR element when your applicationrequires a smaller system package or lower wattdensity.• Ensure wiring integrity by keeping terminal enclosuretemperature below 400°F (205°C).• Size power feeder wires in accordance with NationalElectrical Code guidelines and other applicable codes.• Keep electrical connections clean, dry and tight.• Minimize problems associated with low liquid levelconditions by using low liquid level sensor or sheathtemperature high-limit control.No-HeatSection• Periodically remove the flange assembly to inspectand clean the heating element(s). This preventivemaintenance will reduce premature failure and optimizeheater performance.• Refer to the Installation and Maintenance Instructionsfor correct orientation of FIREBAR elements. This isimportant in air applications with customer-suppliedcirculation tanks. Correct element orientation to flowminimizes pressure drop and increases buoyancy forceand heater performance.WATLOW ®241
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Heater Catalog (Section) - Immersion Heaters - Watlow

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