Duraband Heater Specifications and Tolerances
Performance Ratings
Maximum Temperature: Standard Sheath: 900°F (482°C)
Nominal Watt Density: 20-45 W/in2 (3-7 W/cm2 )
Maximum Watt Density: Dependent on heater size and operating temperature.
Electrical Ratings
Maximum Voltage: 480VAC
Dual Voltage or 3-Phase: Available depending on heater design
Maximum Amperage:
-
Lead Wire Termination: 12.5A
-
Screw Terminations:
-
8-32UNF—20A
-
10-32UNF—25A
Resistance Tolerance: +10%, –5%
Wattage Tolerance: +5%, –10%
Exposed electrical wiring on band heater installations is a violation of Electrical Safety Codes including O.S.H.A.
Physical Size Construction Limitations
Minimum Width: 3/4″ (19.1 mm)
Width Tolerance: ±1/16″ (1.59 mm)
Minimum Inside Diameter: 7/8″ (22.1 mm)
Nominal Gap: 3/8″ (9.5 mm)—If a larger gap is required for probes or thermocouples, specify when ordering.
Built-In Brackets
| Heater Width | Number of Brackets |
|---|---|
| 1-1/2″ to 3″ (38-76 mm) | 1 |
| 3-1/8″ to 5″ (79-127 mm) | 2 |
| 5-1/8″ to 6-7/8″ (130-145 mm) | 3 |
| 7″ to 10″ (178-254 mm) | 4 |
| 10-1/8″ to 15″ (257-381 mm) | 5 |
Minimum ID and Width for Construction/Clamping Styles
| Min. ID | Min. Width | |||
|---|---|---|---|---|
| Style | in | mm | in | mm |
| NB | 2 | 50.8 | 1-1/4 | 31.8 |
| NS | 3 | 76.2 | 1-1/4 | 31.8 |
| NE | 2 1/2 | 63.5 | 1-1/4 | 31.8 |
| SB | 7/8 | 22.1 | 3/4 | 19.1 |
| SS | 2 | 50.8 | 3/4 | 19.1 |
| SE | 2 1/2 | 63.5 | 1-1/4 | 31.8 |
| FB | 1 | 25.4 | 3/4 | 19.1 |
| FS | 2 | 50.8 | 3/4 | 19.1 |
| FE | 2 1/2 | 63.5 | 1-1/4 | 31.8 |
| SL | 4 | 101.6 | 1-1/4 | 31.8 |
| NSL | 4 | 101.6 | 1-1/4 | 31.8 |
| NEL | 4 | 101.6 | 1-1/4 | 31.8 |
| LT | 7 | 177.8 | 1-1/2 | 38.1 |
| LS | 7 | 177.8 | 1-1/2 | 38.1 |
| LE | 7 | 177.8 | 1-1/2 | 38.1 |
| TWL | 1 | 25.4 | 1 | 25.4 |
| RNB | 5 1/2 | 134.7 | 1 | 25.4 |
| RNS | 10 | 254 | 1 | 25.4 |
Recommended Segments by Inner Diameter
| Number of Segments | ID Range | ID Range |
|---|---|---|
| in | mm | |
| 1 | 15-1/2″ & Smaller | 393.7mm & Smaller |
| 2 | 15 1/2″ to 28″ | 393.7mm to 711.2mm |
| 3 | 15 1/2″ to 45″ | 393.7mm to 1143mm |
| 4 | 15 1/2″ to 56″ | 393.7mm to 1422.4mm |
| 6 | 15 1/2″ to 86″ | 393.7mm to 2184.4mm |
| 8 | 25″ to 96″ | 393.7mm to 2438.4mm |
Note: Refer to individual descriptions for further information. Actual heater minimums will be a combination of termination and construction/strap styles.
