Fibrothal™ Heating modules and insulation systems

Fibrothal heating modules and insulation systems 5 Technical data - general 7 Technical data - standard range 13 Modules to special design 27 Modules with embedded heating 27 ROB in panel and shell design 28 Special tube modules 30 Flexible bead-insulated connecting leads 34 Ceramics tubes with flange 37 Ceramic insulators and plugs 38 Attaching Fibrothal modules 39 Welding on the heating element 41 Overview of the heating systems 43 Voltage and power conversion for standard modules 44

FEATURES • Less weight of the insulation • High insulation properties • Flexible to use, possible to switch fastly between different processes • Fast installation and replacement • Energy savings • Exact controlling of the process Introduction Kanthal® is the heating brand within Sandvik. Our lightweight construction has become the norm in many industrial furnaces, with the use of ceramic fibers (KF) up to furnace temperatures of 1550°C (2820°F). The low thermal mass and thermal conductivity of the ceramic fiber furnace linings mean that you can build industrial furnaces which, depending on the...

Fibrothal heating modules and insulation systems Fig. 1  Heating modules with embedded heating elements made of Kanthal alloys for a maximum element temperature of 1150°C (2100°F). Fig. 2  RAC tubes with embedded but virtually free-radiating heating element, for a maximum element temperature of 1300°C (2370°F). Fig. 3  Fibrothal meander II module with free-radiating heating elements for a maximum element temperature of 1300°C (2370°F), mainly for roof heating and tilting fur

Fig. 4  ROB with free-radiating heating elements for a maximum element temperature of 1300°C (2370°F), mainly for wall and floor heating. Fig. 5  Muffles with embedded heating elements made of Kanthal® alloys for a maximum element temperature of 1150°C (2100°F). Fig. 6  Insulation parts of vacuum-formed fiber in the most varied shapes for application temperatures up to 1550°C (2820°F). Fig. 7  FibroSiC are unsupported roof insulating parts, which are strengthened by silicon carbide (Si

KF-modules Chemical properties: KF-modules possess high resistance to chemicals, including most acids, with the exception of hydrofluoric acid, phosphoric acid and strong bases. Wetting with water and oil has no influence on the properties of the ceramic fibers themselves. After drying or evaporation the thermal and physical properties are restored. Care must be taken when they are fitted with heating elements because of possible corrosion. Technical data of ceramic fiber modules Classification temp. °C (°F)* Maximum continuous duty temperature, °C (°F) Density approx. kg/m3 (lb/ft3) Linear shrinkage,...

Tolerances Module dimensions The following tolerances apply to the vacuum-formed insulation with or without heating element. Fibrothal™ panels

Fibrothal shells

Fibrothal can be used in gas or air-tight furnaces only. Maximum permissible element temperatures in various furnace atmospheres Vacuum higher than 10-3 mbar will take too long to evacuate the fiber block. Better with vacuum-tight muffle. Spray scale from heat-resistant parts is Scale see remarks see remarks usually satisfactorily tolerated, iron oxide scale attacks Kanthal - fit cover. Vapours must not form condensates Vapours see remarks see remarks from salts or oxides, otherwise electrical bridges will be formed. Fibrothal withstands high gas velocities Gas velocity see...

Power limitation Maximum recommended load in relation to the furnace temperature for the various heating module designs Specific power, kW/m2 (kW/ft2) To install a voltage of 230 V with a free radiating wire (ROB, Fibrothal meander) an area of 1 m2 (10.8 ft2) is needed. To install a voltage of 230 V with an embedded element (Fibrothal) an area of 0.25 m2 (2.7 ft2) is needed.

Technical data – standard range Heating modules Fibrothal™ standard heating modules are manufactured with embedded heating elements, two principles being followed. Principle I With this method the Kanthal® A-1 heating wires (diameter < 3.5 mm (0.14 in)) are embedded in the ceramic fiber module made of F3 fiber. The maximum element temperature is 1150°C (2100°F). For optimum heat radiation: • The heating wire is made with an oval cross-section • Part of the face of the heating wire is bare • The inside of the heating wires is largely free of ceramic fibers This design is protected by patent. Panels...

With this method – used exclusively for heating tubes – a heating wire of Kanthal® A-1/Kanthal APM™ (diameter 5 mm (0.20 in)) is formed to fit into a ceramic fiber module of F17 fiber with ceramic spacers. In this case the heating element lies on the surface of the insulation and is virtually free-radiating. The maximum element temperature is 1300°C (2370°F) (1350°C (2460°F) for Kanthal APM). A complete range of moulds is available for manufacturing the standard modules. There are therefore no mould costs in this case. In this brochure the voltages have been converted to the eurovoltage (400/230 V)....

The heating surface is the surface which accommodates the heating element. The standard module dimensions are based on the heated surface dimensions plus the minimum required unheated edge area. Panels can be manufactured to a maximum width or length of 1050 mm (41.4 in). Unheated edges can be manufactured to any dimension as long as the overall panel dimension does not exceed the maximum width or length already specified. Standard modules can also be supplied with additional 125 mm (4.92 in) unheated edges on either the width or length (type SL; SB). If modules are to be attached to roofs or...

Standard Fibrothal™ heating panel designs Type designation Part No. Standard dimensions Heated area