Tempco Custom Heater Manufacturing

Adhesive Backed heating Tape Engineering Data

 Adhesive Specifications                                           

 
  Silicone Acrylic
Operating Temperature Range −100°C to 250°C −40°C to 150°C
−148°F to 482°F −40°F to 302°F
Outgassing…TML/VCM 1.047%/.322% 1.0%/.10%
Adhesion to Etched  28 @ +125°C  15 @ +125°C
Aluminum (oz/inch width)  450 @ −100°C  50 @ −100°C
Overall Thickness Applied .025" (.63 mm) .028" (.71 mm)
Dielectric Strength 600 Vdc 600 Vdc

 

General Purpose Wattage Calculations for Tube and Pipe Heating

Tp = P × L × ΔT

Tp = Total Watts Required
P = Watts per lineal foot of tube per °F temp. rise (see chart below)
L = Length of tube in feet
ΔT = Temperature rise, °F above ambient

To Find P: Look at the intersection of Tube O.D. and Insulation thickness.

Installation Thickness Tube Outside Diameter
1/4" 1/2" 1" 2"
 Bare .10 .13 .21 .40
1/2" .07 .09 .13 .20
1" .05 .08 .11

 

Note: This is for estimating power requirements only. Confirmation by prototype testing is recommended.

  • If the temperature rise is over 100 degrees, increase the wattage by 10%.
  • For rapid start-up and to allow for colder material entering the hose, increase the wattage by 25% and use a temperature controller with a temperature sensor.
     

Warning!! FTP Heat Tape is essentially resistance wire in a mountable high temperature adhesive backed tape. In order to be used properly, the heater design must be done and the math worked out, following the example provided.

Engineering Example

A 10 ft. stainless steel braided hose, 1/2" O.D., needs to be heated to 400°F from 70°F. Insulation: 1/2". The voltage is 220V.

  1. Determine the Length.
    • To cover the hose completely would take π × 1/2" × 120" = 188 sq. in. A 12" length of 1/2" tape would cover 6 sq. in. of hose; therefore, 31 ft. of 1/2" tape would completely cover the hose, spiral wrapped edge to edge.
  2. Determine the Watts.
    • Total Power (Tp) = P × L × ΔT From the chart, P = .09 for a 1/2" hose with 1/2" insulation, therefore Tp = .09 × 10 ft. × (400-70) = 297 Watts. For rapid start-up and to compensate for colder material flowing through the hose, increase the wattage by 25% to 400W.
  3. Calculate the Ohms per Foot.
    • ​​​​​​​​​​​​​​The ohms/ft. = E2 ÷ (Tp × L) Therefore ohms/ft. = 2202 ÷ (400W × 31 ft.) = 3.9 ohms per ft.
  4. Calculate the Watts per Foot.
    • ​​​​​​​The Watts per ft. = Tp ÷ L Therefore the watts/ft. = 400 watts ÷ 31 ft. = 12.9 watts/ft.
  5. Choose Heat Tape Material from the Table.
    • ​​​​​​​​​​​​​​From the table, the FTP00035, 1/2" tape with four conductors and silicone adhesive in the parallel/series connection at 4.0 ohm/ft. would fill the requirements. The required 12.9 watts/ft. is well under the maximum rating of 62 watts/ft.

Max. Watts/ft. in Ohms-Per-Foot

The maximum wattage per lineal foot is when the heat tape is applied to a metal heat sink at room temperature. Reduce these ratings linearly to zero watts output at 500ºF. Adhesion to heat sink along entire length is important to prevent burnout when tape is used near maximum wattage rating.

Example: A tape that is 70W/ft. maximum watt density at 74°F, would derate to about 35W/ft. maximum watt density at 250°F.

View Part Numbers and Max Watts/ft in Ohms

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