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Sleeved Jackets are necessary when the Shaped or Tubular Heating Jackets are unable to fit a surface to provide direct heat transfer. Surfaces that are too complex for direct heat may be heated indirectly by introducing a metal sleeve. The uneven surface is then simplified to a geometry more suitable for Jacket fit. The indirect heat on the sleeve creates an “oven” like environment to heat devices such as valves, vessels or grouped instrumentation hardware. Since “oven” heat is indirect, it is slower and must use lower watt density heat.

Features and Specifications

Power density: 1.0 to 5.0 w/in² (0.16 to 0.8 watts/cm²)
Metal Sleeve: Typical, 304 SS, 16 Gauge
Watts, Volts: Custom KW, 120V/1 to 480V/3ph
Size: Custom Modular Sizes for Convenient Install
Weight: Modular, 50lbs (23kg) Max Recommended
Heat Capability: Operating Temperature to 1000°F (538°C)
Max Exposure: 1112°F (600°C)
Power Leads: A Nickel or Cu-Ni, Flying, Sleeved or Armored
Power Plugs: NEMA, Straight, Twist Loc, Pin & Sleeve
Sensors: Process & Limit Thermocouple or RTD


Jacket sizes:
Small Heating Jackets may be constructed to fit ¾ inch diameter tubing and fittings. Large Heating Jackets are limited by weight, typically 50lbs (23kg), but may be constructed in multiples to fit large surfaces.

After the Sleeve is fabricated, The Jacket is constructed to fit the Sleeve. As with a standard Tubular or Shaped Jacket, an inner liner has the heater and sensor components. Heating Tape elements are mechanically stitched or bonded to the liner along with sensors and internal wiring paths. Then, insulation layers are placed over top with gussets and cut-outs necessary to enclose the sleeve. The Jacket is pre-formed to the 3D shape and double stitched for durability. The materials of construction depend upon the temperature and environment of use. Below 550° F choices can include materials such as Teflon and Silicone, which provide durability and some moisture protection.

Hybrid Design:
A system of different style Heating Jackets may be appropriate for a complex project. Sleeved Heating Jackets may be used for difficult geometries and Tubular, Flat or Shaped Jackets for the other areas. Contact your HTS/Amptek® for expert system heater and control application assistance.

The Heating Element:
HTS/Amptek® knitted Heating Tape is stitch bonded to the liner of each Jacket to apply the heat where needed. Monotape™ and Duo-Tape® elements are multi-strand insulated resistance wire, knitted into serpentine strips allowing ultimate flexibility that eliminates thermal stress.

Temperature Capability:
Maximum 1000°F (538°C), AMOX™ construction. Please note that AMOX™ is normally rated to 1400°F (760°C). Sleeves, having limited mass, may overheat if designed to typical high watt density values of (direct conduction) Tubular or Shaped Jackets. Reduced maximum temperatures are prudent to prevent high temperature excursions.

Heated Zones:
Typical Jackets have a single zone; however, multiple zones may be arranged having individual power leads and sensors. This arrangement can offer zonal duty-cycle for ultimate control.

Temperature sensors:
Built in thermal sensors such as RTDs or Thermocouples can be installed for process temperature measurement, or directly on the heating element for sensing limit temperature.

Cutouts and Penetrations:
Cut outs and slits for supports, ports and other hardware are typical of most applications. HTS/Amptek® designs pre-formed Sleeves and Jacket configurations with gusseted holes, slits and seams to provide great fit and easy install and removal. Additional, insulated flaps and straps cover the exposed seams.

Most common Closures are Velcro® flap and D ring strap or lacing eye closure methods, however quicker and cleaner methods include convenient snaps or Delrin® Clips. Sleeves often are hinged or tabbed for easy alignment. The Sleeves typically fit on the heated envelope but “float” firmly within the Jacket.

Contact: HTS/Amptek®
Call or email your questions, or click the quote button for a convenient form to help us with the size and scope of your application.