Bolt Heaters

Bolt Heaters

TELTECH has over thirty-five years experience in the design and manufacture of high quality bolt heaters. The TELTECH Bolt Heater is specifically designed to provide maximum watt density rating on the heated tube length. TELTECH uses the highest quality materials commonly available to manufacture these heaters and maintains rigid quality control procedures to insure a reliable product. Each heater is energized at rated voltage and lectrically tested at full heat prior to shipment.

Applications

  • TELTECH Bolt Heaters are used to preheat large, hollow holding bolts or studs where a high concentration of heat is critical for bolt expansion in a short period of time.
  • As an insertion type unit, the bolt heater is widely used in the manufacture and servicing of heavy duty steam or other pressure equipment.
  • It is also used to heat die blocks and large platens and to expand adjusting bolts on mechanical or hydraulic presses.
  • In general, most applications attempt to produce an expansion (or stretch) of .0015 inches per inch of 1ength on alloy bolts.
  • This will produce a bolt stress of 45,000 psi at the root of the thread.
  • The portion of the bolting member to be heated, excluding threads, is usually approximately 65% of the total length.
  • The following chart outlines suggested heater diameters for some common hole sizes to produce the above stretch using standard Bolt Heaters.

Standard Features

  • Alloy sheath swaged tubular construction
  • Grade "A" magnesium-oxide filled and swaged
  • 80/20 Nickel chrome alloy resistance wire
  • Standard 4" octagon electrical enclosure, with knock-outs for easy wiring
  • Insulating handle
  • Wide range of standard (stock) diameters and lengths.

Benefits

  • Fast response, large bolts can be heated to full expansion in 15-30 minutes
  • May be used in multiples, for uniform heating of matching bolts.

Optional Features

  • Special watt densities, wattages, lengths and diameters available
  • Three conductor power leads and plug assemblies
  • Two conductor power leads with grounding clip and plug assemblies
  • Replaceable element bolt heaters
  • Feature cast boxes for convenient
  • Screw-in interchangeability
  • Flexible Bolt Heaters available

Operating Instructions

  • In view of the fact that bolt heaters operate at high temperatures with a relatively short life, ultimate failure should be anticipated and precautions taken to prevent an electrical or shock hazard.
  • Heaters should be connected to a power supply of rated voltage on the nameplate.
  • All field wiring should be in accordance with NEC and local codes.