Tubular Heaters & Finned Tubular Heaters are used mainly in custom heating applications such as dies, drums, cylinders, holding tanks, injection/blow molding machines. They can be formed into almost any shape, welded (or brazed) to any metal surface, and cast.
The sheath materials available are stainless steel, steel, copper, and incoloy. Standard diameters are: .260", .315", .375", .440" and .475". Diameter tolerance is ±.010"
Sheath Material | Max Temp. Allowed on Sheath | Max Length of Sheath | Max Cold Lengths |
Steel | 750°F | 252" | 96" |
Copper | 350°F | 252" | 96" |
St. Steel | 1200°F | 324" | 96" |
Incoloy | 1600°F | 324" | 96" |
To compute wattage: multiply inside diameter X pi X heated length X allowable watts per sq. inch (based on the table below).
Application | Operating Temperature | Recommended Sheath Material | Watts Per Square Inch |
Clamped to Surfaces | up to 300°F | Steel | 30 |
Clamped to Surfaces | 500°F | Steel | 20 |
Clamped to Surfaces | 800°F | Incoloy | 15 |
Clamped to Surfaces | 1000°F | Incoloy | 10 |
Clamped to Surfaces | 1200°F | Incoloy | 7 |
Clamped to Surfaces | 1400°F | Incoloy | 2.5 |
Still Air | 800°F | Incoloy | 7 |
Still Air | 1000°F | Incoloy | 11 |
Still Air | 1200°F | Incoloy | 14 |
Still Air | 1400°F | Incoloy | 30 |
Clamped into Machined Grooves | 500°F | Steel | 25 |
Clamped into Machined Grooves | 800°F | St. Steel | 15 |
Clamped into Machined Grooves | 900°F | Incoloy | 15 |