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MPI offers you the absolute best tubular element, available 0.260”, 0.315”, 0.375” & 0.430” sheath O.D. Tubular elements are the most versatile, dependable and rugged of any heat generating device. These qualities make it an ideal heat source for many applications. The Tubular Element is the core of the most common heating solutions found today.
MPI Tubular Elements are manufactured from the highest quality materials. This gives you the most dependable heat source for your specific needs.
****Metric Diameters also Available****
|Overall length (inches)||11-20||21-40||41-70||71-100||101-140||141-170||171-200||201+|
|Tolerance in sheath length (+/- in)||0.1||0.125||0.16||0.19||0.22||0.25||0.375||0.5|
|Tolerance in heated length (+/- in)||0.25||0.5||0.9||1.130||1.4||1.65||2||2.38|
|Min. unheated length (inches)||1||1.25||1.5||1.625||1.75||2.25||2.25||2.5|
|Tubular diameter (inches)||Maximum voltage||Maximum amps||Minimum Ohms per heated length (inches)||Maximum Ohms per heated length (inches)||Minimum sheath length (inches)||Maximum sheath length (inches)|
The two most critical factors that affect the durability of a tubular heater are:
The corrosivity of the medium and its operating temperature are critical in determining the sheath material type. The table below lists various sheath materials, maximum allowable temperatures and mediums within which they are recommended to operate.
The watt density determines the temperature that a heating element sheath will attain within specific application conditions.
|Sheath Material||Maximum Sheath Temperature||Applications|
|Copper||350°F||Immersion into water and non-corrosive low viscosity liquids|
|Steel||750°F||Oil, wax, asphalt, cast in aluminum or iron|
|Stainless Steel 304-316||1200°F||Corrosive liquids, food industry, sterilizers|
|Incoloy||1500°F||Air, corrosive liquids, clamped to surfaces|
|Solution||Maximum Watts/in2||Max Operating Temperature (°F)|
|Bunker C fuel oil||10||160|
|Caustic soda 2%||45||210|
|Caustic soda 10%||25||210|
|Caustic soda 75%||10||180|
|Fuel oil pre-heating||9||180|
|Machine oil, SAE 30||18||250|
|Heat transfer oils||12-20||500-650|
The MgO insulating medium inside a tubular heater is highly hygroscopic and can absorb moisture from its terminal ends. Moisture resisting seals are barriers that resist or stop moisture and contamination.
This seal is a silicone-based resin that is applied to tubular heater terminal ends. The seal penetrates a short length of the MgO insulation and transforms it into a moisture and contamination resistant medium suitable for temperatures below 390°F.
This is a silicone room temperature vulcanizing seal that can resist moisture and contamination for up to 450°F.
This is a liquid resin which is thermally cured to reach solid state. This moisture barrier is adequate for temperatures up to 250°F.