FLANGE-MOUNTED HEATERS Application: Heating of Static Fluids Figure 1: Typical sketch of a flange-mounted electric heater TECHNICAL DATA GENERAL CHARACTERISTICS The flange-mounted electric heaters 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 in direct contact with the fluid, the heat exchange is very effective and it is possible to design very compact heaters. Tank Coupling Flange Maximum Length Below Ledge Neutral (non heating) section Electrical contact box height Diameter/tube bundle maximum envelope Full-section distancing baffle Female sleeve for power cable glands Female sleeve for signal cable glands 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 lead to define: 1. the specific power and the required number of heating elements 2. the diameter, thickness and material of the flange 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 The manufacturing experience built up in several years of operation in the market, copying with the most different applications, enables us to suggest to our customers materials and technical solutions which are best suited to the application of interest. Fluid Electric Heaters Braze Welding of the first flange-mounted heater Year 1967 The results of the preliminary design is provided, in form of a data sheet, already as part of the offer. This enables the customer to verify the main electric data and the mechanical interfaces to the plant.

FLANGE-MOUNTED HEATERS Application: Heating of Static Fluids THE WELDING OF THE HEATING ELEMENTS The elements are welded to the flange by waterproof TIG welding. In some cases, the high operating temperature impose a construction which foresees a “ distancing” of the electric contact box (“ cold head” construction). In these cases the welding of the elements is made on the upper flange and the elements are left free to slide within the lower flange. To prevent fluid spillage, each element is covered by a distancing tube, TIG-welded to both flanges, that guarantees a waterproof construction (see...

FLANGE-MOUNTED HEATERS Application: Heating of Static Fluids DATA REQUIRED FOR A CORRECT DEFINITION OF A FLANGE-MOUNTED HEATER To design a flange-mounted heater a set of data is required. The availability of all the data is a pre-requisite for an optimum sizing and for a precise definition of the heating power. The Table 1 presented hereunder summarises the required data. Table 1: data required to design a flange-mounted heater Design Data Thermodynamic Data ð For non common fluids please specify the thermodynamic characteristics at, at least, three different temperatures Fluid Note: More information...

FLANGE-MOUNTED HEATERS Application: Heating of Static Fluids “L-bent” Vertical Heater Designed to heat large liquid quantities or liquids which experience, during the process, significant level changes, this type of heater is best suited whenever it is requested to perform maintenance operations without removing the fluid itself. The heater has a neutral section which corresponds to its straight vertical length or, in any case, defined coherently with the minimum fluid level that can be expected in the different operational phases. The horizontal section is the heating one. Should the liquid...