YLTHERM 800 Heat Transfer Fluid - Loikits …

1 1 SYLTHERM 800 heat Transfer Fluid28 For further information, The United States And Canada: 1-800-447-4369 FAX: 1-517-832-1465In Europe: +31 20691 6268 FAX: +31 20691 6418 In The Pacific: +886 2 715 3388 FAX: +886 2 717 4115In Other Global Areas: 1-517-832-1556 FAX: 1-517-832-1465 : No freedom from any patent owned by Seller or others is to be inferred. Because use conditions and applicable laws may differ from one locationto another and may change with time, Customer is responsible for determining whether products and the information in this document are appropriate forCustomer s use and for ensuring that Customer s workplace and disposal practices are in compliance with applicable laws and other governmentalenactments. Seller assumes no obligation or liability for the information in this document. NO WARRANTIES ARE GIVEN; ALL IMPLIED WARRANTIES OFMERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE ARE EXPRESSLY October 1997 NOTE: SYLTHERM heat Transfer fluids are manufactured by Dow Corning Corporation and distributed by The Dow Chemical in *Trademark of The Dow Chemical CompanyNA/LA/Pacific: Form No.

2 176-01435-1097 AMSE urope: CH 153-046-E-1097*SYLTHERM 800 heat Transfer FluidProduct Technical Data800 Product Technical Data2 SYLTHERM 800 heat Transfer Fluid Introduction .. 3 Performance .. 3 Fluid Selection Criteria .. 4 Thermal Stability .. 4 Equilibrium and Operating Pressures .. 5 Expansion Tank .. 5, 6 Simplified Schematic for Loop Design .. 7 Corrosivity .. 8 Flammability and Fire Hazards .. 8, 9 New System Start-up .. 10 Health and Safety Considerations .. 11 Customer Service .. 11 Technical Support and Assistance .. 11 Fluid Analysis .. 11 Retrofill .. 12 Shipping Limitations .. 12 Storage and Shelf-life .. 12 Packaging .. 12 Properties and Engineering Characteristics Physical Properties .. 12 Vapor PropertiesEnglish Units .. 13SI Units .. 13 Liquid Saturation PropertiesEnglish Units .. 14SI Units .. 15 Thermal Conductivity .. 16 Calculated heat of Vaporization.

3 17 Vapor Pressure .. 18 Specific heat .. 19 Density .. 20 Viscosity .. 21 Engineering Data Liquid Film CoefficientEnglish Units .. 22SI Units .. 23 Pressure DropEnglish Units .. 24SI Units .. 25 Thermal Expansion .. 26 Typical Liquid Phase Heating Scheme .. 27*Trademark of The Dow Chemical Company Trademark of Dow Corning CorporationCONTENTSFor Information About Our Full Line of learn more about the full line of heat Transfer fluids manufacturedor distributed by Dow including DOWTHERM* syntheticorganic, SYLTHERM silicone and DOWTHERM, DOWFROST*,and DOWCAL* glycol-based fluids request our product line the number for your area listed on the back of this (450 F) (232 C)(380 F) (193 C) heat Exchanger#2 Vent(375 F) (191 C)PITRCS teamCondensateLCSteam CondensatePumpTICFIPICLCC ooling LoopCirculating PumpSteam GeneratorProcess TankStm. LoopCirculating PumpExpansionTankPCVNLA /LSLH eating LoopCirculating PumpSpare PumpHeater forSYLTHERM FluidTIC7 FRCFSLTSHP rocess FluidBEBCBA1 PSHPIPSLPITo Pilot LightHeat Exchanger#1 VentTRCtPCVS nuffing Tankand Panel FluidtttPRVPRVV entttPressure Relief HeaderVent HeaderVentSteamPRVLItttHeating orCooling ProcessProcess FluidtPRVtttLILoadingPumptSee Figure 2 Slope Do Not Pocket, heat TraceFigure 21 Typical Liquid Phase Heating SchemeUsing SYLTHERM FluidInstrument LegendBA Burner AlarmPI Pressure IndicatorPrincipal Circuits with SYLTHERM FluidBC Burner ControlPIC Pressure Indicating ControllerBE Burner Element (Fire-Eye)PRV Pressure Relief ValveElectrical LinesFI Flow Indicator (Orifice)

4 PSH Pressure Switch HighFRC Flow Recording ControllerPSL Pressure Switch LowInstrument Air LinesFSL Flow Switch LowTIC Temperature Indicating ControllerLC Level ControllerTRC Temperature Recorder ControllerPVC Pressure Control ValveTSH Temperature Switch High3 SYLTHERM 800 heat Transfer FluidSYLTHERM 800 heat Transfer fluidprovides excellent high-temperaturestability. It is capable of operatingmore than 10 years at 750 F (400 C)without the fouling or periodicreprocessing problems associatedwith other heat Transfer 800 heat Transfer fluidhas an operational temperature rangeof -40 F (-40 C) to 750 F (400 C).Maximum recommended filmtemperature is 800 F (427 C).The silicone polymer structure isshown in Figure 1. Under operationalthermal stress, the Fluid undergoesvery slow rearrangement of thesilicone-oxygen bonds to assume acomposition that remains stable atthe required operating temperatureand pressure.

5 The rate of molecularrearrangement is directly relatedto the temperature and is depressedsubstantially because of the pat-ented formulation. Systems usingSYLTHERM 800 Fluid require noperiodic venting; therefore, the low-molecular-weight linear and cyclicsiloxanes that result from therearrangement remain part of theheat Transfer media and do not causesystem fouling. The rearrangementthat occurs with SYLTHERM 800 heattransfer Fluid is not a degradationreaction and does not affect Fluid 1 Dimethyl Polysiloxane Molecule Trademark of Dow Corning Corporation1 You may need to comply with similar or additional legislation in other your Dow representative for Virtually Odorless,Long-lastingHeat Transfer FluidSYLTHERM 800 Fluid is a highlystable, long-lasting, silicone fluiddesigned for high-temperature liquid-phase operation. It has a recommendedoperating temperature range of-40 F (-40 C) to 750 F (400 C).

6 Operating continuously at the upperend of this range, SYLTHERM 800 fluidexhibits low potential for foulingand can often remain in servicefor 10 years or more. The Fluid isessentially odorless and is low inacute oral toxicity. Silicone heattransfer fluids such as SYLTHERM800 Fluid are not listed as reportableunder SARA Title III, Section 800 Fluid featuresinclude:n Low fouling potentialn Low freeze pointn High-temperature stabilityn Long lifen Noncorrosiven Low acute oral toxicityn Low odorn Non-reportable under SARAT itle III, Section 313126 Figure 19 Thermal Expansion of Liquid SYLTHERM 800 Fluid (English Units)Basis: 1 gallon at 75 FFigure 20 Thermal Expansion of Liquid SYLTHERM 800 Fluid (SI Units)Basis: 1 cubic meter at 25 Volume, m3 Temperature, Volume, gallonTemperature, F41000 F (538 C) with low or noflow, polymer cross-linking mayoccur . This will eventually causethe Fluid viscosity to increase,requiring Fluid replacement.

7 Someproblem areas to be avoidedinclude:1. Flame Operating the heater above itsrated Modifying the fuel-to-air mixingprocedure to change the flameheight and pattern. This canyield higher flame and gastemperatures together withhigher heat Low Fluid velocity/high heat fluxareas resulting in excessive heattransfer Fluid film manufacturer of the firedheater should be the primarycontact in supplying you with theproper equipment for your heattransfer system andOxidation EffectsAt elevated temperatures, SYLTHERM800 heat Transfer Fluid is sensitive tocontamination. Contamination byacids or bases can result in acceleratedrates of volatile by-product by water, oxygen,or other oxidants can result in cross-linking of polymer molecules, and,if not corrected, can cause a gradualincrease in is important that contaminationbe minimized. Potential sources ofcontaminants such as water, steam,process material, atmospheric air,and humidity should be appraisedand modifications made SELECTION CRITERIAS tabilitySYLTHERM 800 Fluid offers goodthermal stability at temperatures upto 750 F (400 C).

8 The maximumrecommended film temperature is800 F (427 C).Freeze PointSYLTHERM 800 Fluid has a minimumpumpability temperature less than-40 F (-40 C).Low Odor, Non-reportableThe chemical composition ofSYLTHERM 800 Fluid makes it apreferred choice for users with theneed for low odor. Additionally,SYLTHERM 800 has no componentscurrently listed as reportable underSARA Title III, Section 800 is not a hazardousproduct as defined in the OSHAH azard Communication StabilityThe thermal stability of a heattransfer Fluid is dependent onmany factors. Properly maintainedSYLTHERM 800 heat Transfer fluidcan be aged continuously at 750 F(400 C) for more than 10 yearsbefore it needs replacement. Longerfluid life can be expected in systemsoperating at lower Transfer CapabilityThe exceptional thermal stability ofSYLTHERM 800 heat Transfer fluidresults in uniquely stable heat trans-1 You may need to comply with similar oradditional legislation in other your Dow representative properties.

9 Because it exhibitslow potential for fouling, largecorrection factors for fouling inheat Transfer coefficient calcula-tions are not needed (a foulingfactor of (hr)(ft2)( F)/Btu[ x 10 -5 m2 K/W] is commonlyused). Additionally, the uniquerearrangement chemistry ofSYLTHERM 800 heat Transfer fluidcan offset the viscosity increasescharacteristic of heat Transfer fluidsas they age. The result is that,throughout its life, the film heattransfer coefficient of SYLTHERM 800heat Transfer Fluid can remain asgood as, or can improve above, theoriginal Fluid key areas of focus for heattransfer operations are designingand operating the heater and/orenergy recovery unit, preventingchemical contamination, andeliminating Fluid contact with airand units are operated at hightemperatures, Fluid velocities inheaters should be a minimum of6 feet per second (2 m/s); a rangeof 6 to 12 feet per second (2 4 m/s)should cover most cases.

10 The actualvelocity selected will depend on aneconomic balance between thecost of circulation and heat limitations are usuallyplaced on heat flux by the equip-ment manufacturer . This heat fluxis determined for a maximum filmtemperature by the operatingconditions of the particular Design and OperationPoor design and/or operation of thefired heater can cause overheatingand will eventually cause the Fluid sviscosity to increase to a pointwhere replacement of the fluidis necessary to restore systemperformance. Taken to an extreme,such as extended aging above25 Figure 18 Pressure Drop vs. Flow Rate of SYLTHERM 800 Fluid in Schedule 40 Nominal Pipe andBWG Tube (SI Units) , Drop, kPa/100 m of pipeFlow Rate, m3/secVELOCITY (m/sec) 40 BWG, 12mm14 BWG, 19mm16 BWG, 19mm14 BWG, 25mm16 BWG, 25mmTUBE SIZE75mm18 BWG, 1 234 5 Multiplication FactorTemperature, C x 100 Temperature CorrectionMultiplier Factor5fluid to meet your process require-ments.