Trace Heating Guide - Cable Services

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INDUSTRIAL TRACE HEATING GUIDELINES15INDUSTRIAL TRACE HEATING GUIDELINES14InsulationThickness(mm)10202530405080ΔT( O C)20304020304060203040608010020304060801001201401601802030406080100120140160180203040608010012014016018020304060801001201401601805026016.424.933.79.514.519.630.28.112.316.625.635.145.47.110.814.622.530.939.849.359.469.980.95.88.912.018.525.432.840.648.857.466.55.07.710.416.022.028.435.142.349.857.63.85.87.912.116.621.526.632.037.743.7401 1 /24813.620.727.98.012.216.525.56.910.414.121.829.938.66.19.212.519.226.434.142.250.859.869.25.07.710.416.021.928.335.142.249.757.54.46.79.114.019.124.730.636.843.450.23.45.27.010.814.819.123.628.433.438.7321 1 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/4146.29.412.74.06.28.312.83.65.47.411.415.620.13.35.06.710.314.218.322.727.232.137.12.84.35.89.012.315.919.723.727.932.32.63.95.38.111.214.417.821.525.329.22.13.24.46.79.211.914.717.720.924.160024610139.7212.6287.474.6113.4153.4236.560.792.4124.9192.6264.5341.551.378.1105.6162.9223.6288.7357.5430.1506.2586.239.460.081.1125.1171.7221.7274.5330.2388.7450.132.248.966.2102.1140.1180.9224.0269.4317.2367.221.132.143.567.092.0118.8147.1176.9208.3241.250020508117.2178.3241.162.695.3128.9198.751.177.7105.1162.0222.4287.243.265.888.9137.1188.3243.1301.0362.1426.3493.533.350.668.5105.6144.9187.1231.7278.7328.1379.927.241.456.086.3118.5153.0189.5227.9268.3310.718.027.437.057.178.3101.2125.3150.7177.4205.445018457105.9161.1217.956.786.2116.6179.746.270.395.1146.7201.4260.039.259.680.6124.3170.6220.3272.8328.1386.2447.130.245.962.195.8131.5169.8210.3252.9297.7344.724.737.650.978.5107.7139.1172.2207.2243.9282.416.425.033.852.171.592.3114.3137.5161.9187.54001640694.6143.9194.650.777.1104.3160.841.463.085.2131.3180.3232.835.153.472.2111.4152.9197.4244.4294.0346.1400.727.141.355.886.0118.1152.4188.8227.1267.3309.522.333.945.870.696.9125.1154.9186.4219.4254.014.922.630.647.164.783.5103.4124.4146.4169.53501435683.3126.7171.344.768.092.0141.836.555.675.2115.9159.2205.531.047.263.898.4135.1174.5216.1259.9306.0354.224.036.649.476.2104.6135.1167.3201.2236.9274.319.830.140.762.786.1111.1137.6165.5194.9225.613.320.227.342.157.874.692.4111.2130.9151.53001232476.1115.8156.640.962.384.2129.933.551.069.0106.3146.0188.528.543.358.690.4124.0160.2198.3238.6280.8325.222.133.645.570.196.2124.2153.9185.1217.9252.218.227.737.557.879.3102.4126.8152.5179.5207.912.318.725.339.053.569.185.5102.9121.1140.32501027364.798.5132.234.953.271.9110.828.743.659.090.9124.8161.124.437.150.277.4106.3137.2169.9204.4240.6278.619.028.939.160.382.7106.8132.3159.1187.3216.915.723.932.349.968.488.3109.4131.6154.9179.410.716.322.034.046.660.274.589.6105.5122.2200821952.680.0108.228.543.458.790.523.535.748.374.5102.3132.020.130.541.363.687.3112.8139.6168.0197.7228.915.723.932.349.868.488.3109.3131.5154.8179.313.119.926.941.456.873.490.9109.3128.7149.09.013.718.528.639.250.662.775.488.8102.8150616841.162.584.522.534.246.371.418.628.338.259.081.0104.515.924.332.850.669.489.7111.0133.5157.2182.012.619.125.939.954.870.887.6105.4124.1143.710.516.021.733.445.959.273.388.2103.9120.37.411.315.223.532.241.651.561.972.984.4100411428.843.859.216.024.433.050.913.420.327.542.458.275.211.617.623.836.650.365.080.496.8113.9131.99.214.119.029.340.252.064.477.491.1105.57.811.916.124.834.144.054.565.677.289.45.78.611.617.924.631.839.347.355.764.58038923.035.047.313.019.826.741.210.916.622.434.547.461.29.514.419.530.041.253.265.979.393.3108.17.611.615.724.333.343.053.364.175.487.36.59.913.420.728.536.745.554.764.474.64.87.39.915.320.927.033.540.347.454.9652 1 /27619.329.439.711.116.822.835.19.314.219.229.640.652.58.112.416.825.935.545.856.768.380.493.06.610.113.721.128.937.346.255.665.575.85.78.711.818.124.932.139.847.956.365.24.36.58.813.518.624.029.735.742.148.7Pipe SizeNB (mm)NPS (inches)OD (mm)• Pipe heat loss (Q s ) is shown in watts per minute (W/m).• Heat loss calculation is based on metal pipes insulated with glass fibre and locatedoutdoors in a 8.9 m/s wind.• A 10% safety factor has been included.• For indoor applications multiply heat loss by 0.9.Pipe Heat LossPipe InsulationGlass FibreMineral Wool (Rockwool)Mineral Fibre BlanketFoamed ElastomerRigid Cellular PolyurethaneCalcium Silicate BlockCellular GlassExpanded Perlite1 W/mK = 0.86kcal/mhKInsulation1.01.061.201.170.671.501.611.50Thermal Conductivity At10 O C Mean Temp (W/mK)0.0360.0380.0430.0420.0240.0540.0580.054Insulation FactorsValve TypeGateButterflyBallGlobeHeat Loss(Metre Equivalent)1.30.70.81.2Valve Heat Loss Factor
INDUSTRIAL TRACE HEATING GUIDELINES16Heat Tracing Plastic Pipes WithSelf-Regulating HeatersGeneral InformationRaychem self-regulating heaters are ideal for heat tracing plastic pipes. The self-regulatingfeature of Raychem cable enables the heater to vary its response to sensed temperaturesat each point along the circuit. This means the heater’s power output will not overheatthe pipe, even where overlapped.Raychem BTV-CR and BTV-CT can be used safely and without over-heating on any ofthe common plastic pipe materials. These products have a tinned copper braid whichprovides the earth path in the case of an earth fault. Consult Cable Services regardingother applications and the use of other Auto-Trace products on plastic pipes.Table 1The following table lists generally accepted maximumallowable temperature for various plastic pipe materials:Caution:These are typical values. The temperature ratings ofplastic pipes depend upon operating pressure, so servicetemperature ratings may be lower (consult the pipemanufacturer’s literature).DesignThe thermal conductivity of plastics is much lower than that of carbon steel(approximately 150 times less). This lower thermal conductivity does not appreciablyaffect the heat loss from the system, but does affect the thermal environment aroundthe Auto-Trace heater. The increased resistance to heat transfer from the heaternecessitates compensation of the heater’s power output.Factors which affect the thermal output of Raychem heaters are the heater geometry,plastic pipe wall thickness, and the use of heat transfer aids, e.g. aluminium tape.Extensive testing of Raychem products has determined the effect for these factorson heater power output. Power output adjustment factors for typical applicationsare shown in Table 2. These adjustment factors are applied to the power output forinsulated steel pipes to give output for insulated plastic pipes.ATE-180 aluminium tape may be used to increase the output of Raychem’s heaters onplastic pipes. The design may consider installation with glass cloth tape (not ATE-180)with ATE-180 over the Raychem heater, or with ATE-180 both under and over theheater. Power output adjustment factors for these alternatives are included in Table 2.Table 2Power output adjustment factors (pipe wall thickness 6mm or less).PolyethylenePVCABSPolypropyleneCPVCFRP50 O C60 O C70 O C70 O C80 O C95 O CWithout ATE-180 With ATE-180 aluminium With ATE-180 aluminiumaluminium tape tape* over heater tape* under & over heater3BTV2 0.60 0.75 0.855BTV2 0.50 0.75 0.808BTV2 0.45 0.65 0.7510BTV2 0.45 0.70 0.75*Applied longitudinally along heater lengthChart Ratings (Industrial Heaters)Self Regulating HeatersCatalogueNumberFor TemperatureMaintenance Up To ( O C)NominalSupplyVoltage Vac3 BTV11105 BTV1110658 BTV111010 BTV111010 QTV111015 QTV111011020 QTV11105 KTV-11108 KTV-111015015 KTV-111020 KTV-11103 BTV22305 BTV2230658 BTV223010 BTV223010 QTV223015 QTV211023020 QTV22304 XTV22308 XTV223012 XTV212023015 XTV223020 XTV22305 KTV-22308 KTV-223015015 KTV-223020 KTV-2230**20 bars saturated steam (maximum cumulative exposure 1000 hours)MaximumCircuit Length100m80m65m55m50m60m55m115m90m65m55m200m165m130m105m115m100m110m250m180m145m130m110m225m180m130m110mMaximum ExposureTemperaturesContinuous Intermittent65 O C65 O C65 O C65 O C110 O C110 O C110 O C150 O C150 O C150 O C150 O C65 O C65 O C65 O C65 O C110 O C110 O C110 O C120 O C120 O C120 O C120 O C120 O C150 O C150 O C150 O C150 O C85 O C85 O C85 O C85 O C135 O C135 O C135 O C215 O C **215 O C **215 O C **215 O C **85 O C85 O C85 O C85 O C135 O C135 O C135 O C215 O C **215 O C **215 O C **215 O C **215 O C **215 O C **215 O C **215 O C **215 O C **Approval authorities worldwide have permitted the installation of the braided versionsof Raychem products in hazardous areas without thermostatic controls.For specific approvals information, see the product data sheets or contact Cable Services.Non-Self Regulating HeatersCatalogueNumber5 VPL10 VPL15 VPL20 VPLIHT / 2 / 10-CTIHT / 2 / 20-CTIHT / 2 / 30-CTFHT / 2 / 10-CTFHT / 2 / 20-CTFHT / 2 / 30-CTFG 260 - 10FG 260 - 20FG 260 - 30FG 260 - 40For TemperatureMaintenance Up To ( O C)125230200200NominalSupplyVoltage Vac230230230230230230230230230230230 or 110230 or 110230 or 110230MaximumCircuit Length225m160m130m110m120m90m75m200m150m120m160m or 80m100m or 50m90m or 40m60mRatings for other products (PYRO etc.) available on request.Power Off250 O C250 O C250 O C250 O C200 O C200 O C200 O C260 O C260 O C260 O C260 O C260 O C260 O C260 O C17INDUSTRIAL TRACE HEATING GUIDELINES
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