Plug-mounted immersion heaters
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HEATERS MOUNTED ON THREADED PLUG Application: Heating of Static Fluids Figure 1: Typical sketch of an electric heater mounted on a threaded plug GENERAL CHARACTERISTICS The electric heaters mounted on a threaded plug have been conceived to satisfy the most different needs in the heating of liquid substances, both in the industrial and in the civil applications. They are designed to be inserted into tubes, basins or pressurised tanks and they are sunk in direct contact with the fluid. Thanks to the presence of armoured electrical heaters, the heat exchange is very effective and it is possible to design very compact heaters. These heaters are quite different from the flange-mounted heater: they are normally smaller and their heating power is lower. These products are designed by our technical department on the basis of customer provided functional requirements. The design takes into account the physical, chemical and thermodynamic characteristics of the fluid to be heated, as well as the operating temperature, the features of the site and the allowable clearance in the area where the heater will be installed. The iteration between design and analysis leads to define: 1. the specific power and the required number of heating elements (1 or 3) 2. the threaded-plug dimensions 3. the maximum sheath temperature and, consequently, the safety devices to be used 4. the materials to be used in the construction 5. the dimensional characteristics of the heater Thanks to the accumulated experience, to the data collected during in-house testing and to the return information provided by our customers, we can today propose the most appropriate materials and solutions to the customer. The main characteristics of the heaters are defined in a technical data sheet, provided with the offer, which allows the customer verify the main electrical data and the mechanical interfaces to the plant. TECHNICAL DATA (see also Figure 1) D Threaded Plug Diameter Maximum Length Below Ledge Neutral (non heating) section Electrical contact box height Electrical contact box side envelope H cable gland TYPICAL INDUSTRIAL APPLICATIONS ^> Oil pre-heating in lubrication gear cases *4> Pre-heating of combustible oils in tanks anti-frost protection in storage tanks ^ Hot/Warm water supply ^ Food industry machinery ^> Back-up heating unit e o o o o 9 Electric Heaters

HEATERS MOUNTED ON THREADED PLUG Application: Heating of Static Fluids STANDARD HEATERS Many application require heaters mounted on threaded plugs to heat water or oil. In these common situations, the possibility to select easily the required heater and trust on a fast delivery turns out to be very useful. To cope with this need, a catalogue of heaters mounted on a threaded plug (PLUG & PLAY heaters) has been setup. For these heaters the heating elements are ready on stock and, consequently, the delivery is normally feasible after few days from the order. The main features of these heaters...

HEATERS MOUNTED ON THREADED PLUG Application: Heating of Static Fluids These heaters can be provided in the following versions: 4. mention the selected product code in the request for quotation or in the order that it is planned to issue. In defining the product code, the information in the tables below shall be taken into account: ■ Power supply at 230 V (monophase - 1 heating element) or at 400 V (tri-phase - 3 heating elements - star connection). 230V power supply (3 elements - delta connection) is also possible Specific power equal to 7 W/cm2 or 2 W/cm2 Available plugs: 1" % Gas, 1" 7...