Bolt Insertion Heaters
Utilizing the principles of thermal expansion and contraction, bolt insertion heaters are used to tighten bolts in the process of assembling heavy equipment. Bucan has extensive experience in manufacturing bolt insertion heaters; our heating cells are used in many major projects in North America.
Bucan bolt insertion heaters utilize an Incoloy-sheathed tubular heater formed into a hairpin and inserted into an exterior protective shield. A compacted MgO medium separates the tubular heater from the outside shell. This construction allows Bucan bolt insertion heaters to operate at temperatures above conventional Incoloy-sheathed tubular heaters.
Bucan bolt insertion heaters can be manufactured in various diameters, lengths, and wattages for different requirements.
Typical Heating Applications:
- Power Plants
- Turbines
- Compressors
- Large Cylinders
- Heavy Construction
- Presses
Tubular heating elements may absorb moisture if they sit idle for a long period of time or get exposed to a humid environment. This might lower the dielectric characteristics of the MgO insulation and cause electrical shorting and premature failure. In order to prove the electrical integrity of a tubular heater, the insulation resistance of each circuit to ground should be checked using a 500 VDC megger. An initial reading of 0.5 Meg-Ohms or more is acceptable in the field. If heaters do not pass the Meg-Ohms test they should be dried out. An ideal drying procedure is oven-drying at 375°F after removing the terminal hardware. An alternate procedure is to apply a lower voltage (please consult factory for instructions). The target is to attain at least 20 Meg-Ohms.
| Hole Diameter | Heater Diameter (App.) | "B" Heated Length | Standard Voltages | Wattage | Catalog No. | |||
|---|---|---|---|---|---|---|---|---|
| In | mm | In | mm | In | mm | |||
| 0.5 | 12.7 | 0.488 | 12.4 | 12 | 305 | 120, 208, 240 | 875 | BH500-305-875 |
| 24 | 610 | 1650 | BH500-610-1650 | |||||
| 36 | 914 | 2400 | BH500-914-2400 | |||||
| 0.563 | 14.3 | 0.5 | 12.7 | 12 | 305 | 120, 208, 240 | 900 | BH563-305-900 |
| 24 | 610 | 1700 | BH563-610-1700 | |||||
| 36 | 914 | 2500 | BH563-914-2500 | |||||
| 0.625 | 15.9 | 0.563 | 14.3 | 12 | 305 | 120, 208, 240, 480, 600 | 1500 | BH625-305-1500 |
| 24 | 610 | 3250 | BH625-610-3250 | |||||
| 36 | 914 | 208, 240, 480, 600 | 4000 | BH625-914-4000 | ||||
| 0.688 | 17.5 | 0.63 | 16.0 | 12 | 305 | 120, 208, 240, 480, 600 | 1700 | BH688-305-1700 |
| 24 | 610 | 3500 | BH688-610-3500 | |||||
| 36 | 914 | 208, 240, 480, 600 | 4150 | BH688-914-4150 | ||||
| 0.75 | 19.1 | 0.687 | 17.4 | 24 | 305 | 120, 208, 240, 480, 600 | 3500 | BH750-610-3500 |
| 36 | 610 | 4200 | BH750-914-4200 | |||||
| 48 | 914 | 208, 240, 480, 600 | 6000 | BH750-1219-6000 | ||||
| 0.875 | 22.2 | 0.787 | 20.0 | 24 | 610 | 120, 208, 240, 480, 600 | 3500 | BH875-610-3500 |
| 36 | 914 | 4750 | BH875-914-4750 | |||||
| 48 | 1219 | 208, 240, 480, 600 | 6250 | BH875-1219-6250 | ||||
| 1 | 25.4 | 0.965 | 24.5 | 24 | 610 | 120, 208, 240, 480, 600 | 3500 | BH1000-610-3500 |
| 36 | 914 | 5000 | BH1000-914-5000 | |||||
| 48 | 1219 | 208, 240, 480, 600 | 6500 | BH1000-1219-6500 | ||||