Heater Catalog - Watlow

Circulation HeatersWATROD and FIREBARCirculation HeatersFeatures and Benefits (Continued)All catalog units rated to ANSI pressure Class 150• Provides pressure vessels (tanks) that are eithercarbon, 304 or 316 stainless steelStandard offering includes units rated for up toand including ANSI pressure class 600 (applicationreview required)• Provides pressure vessels (tanks) available in carbonsteel, 304 or 316 stainless steel materials• Includes schedule 40, standard and 80 pipe used inthe pressure vessel constructionCatalog units provided with NPT or ANSI Class 150nozzle connection• Makes installation easy. Inlet and outlet nozzleconnections are threaded MNPT on 8 in. (203 mm)and smaller tanks. Class 150 flanged connections on10 in. (254 mm) and larger tanksMounting lugs are welded onto the tank wall of all2 1 /2 in. (64 mm) NPT and larger units• Provides mounting supportGeneral purpose, moisture resistant, enclosuresavailable• Offers easy access to terminal wiringOptionsTerminal EnclosuresGeneral purpose terminal enclosures, withoutthermostats, are supplied on all Watlow circulationheaters. Moisture and explosion resistant ratings areavailable to meet specific application needs. For screwplug terminal enclosures, refer to page 171.For flange terminal enclosures, refer to page 243.Stand-off Terminal EnclosuresStand-off terminal enclosures help protect terminalenclosures against excessive temperatures. For details,refer to page 239.ASME Pressure Vessel Code WeldingFlange or screw plug assemblies can be provided withan ASME Section VIII, Div. I pressure vessel stamp uponrequest.Branch CircuitsBranch circuits are designed for 48 amperes per circuitmaximum. Contact your Watlow representative for circuitrequirements other than those listed in the stock charts.332Flange mounting holes• Straddles centerline to comply with industry standardsUL ® and CSA component recognition under filenumbers E52951 and 31388 respectively• Meets industry safety standardsTypical ApplicationsWater:• Deionized• Demineralized• Clean• Potable• Process• Industrial water rinse tanks• Hydraulic oil, crude, asphalt• Lubricating oils at API specified watt densities• Heat transfer oil• Paraffin• Caustic cleaners• Nitrogen, hydrogen and other air/gas systems• Superheating steamCertified EnclosuresCSA, ATEX or IECEx certified enclosures protect wiring inhazardous gas environments. These terminal enclosures,covered under CSA file number 61707, ATEX certificate# SIRA 10ATEX 1155X or IECEx certificate # IECEx CSA09.0010 are available on WATROD flange heaters. Foradditional information, see page 567 and 568 or contactyour Watlow representative.For products that will be installed in hazardous locations,please provide the following information:• Operating conditions• Minimum and maximum ambient temperatures for theinstallation location• Mounting orientationWatlow must understand this information so that anappropriate design can be provided.ThermostatsTo provide process temperature control, Watlowoffers optional single- and double-pole thermostats.Thermostats are typically mounted in the terminalenclosure. Optional side mounting on vessel alsoavailable.See Screw Plug Immersion Heaters, page 167 andFlange Immersion Heaters, on page 239 for details.WATLOW ®