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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