In some applications in the Wine Industry sector, the installation area of the flanged heater is classified, with a consequent request for certification in Ex execution of the flanged heater.

The flange Electric heating elements in Exd execution are essentially composed of:

• Process heater connection flange.
• Electric heating beam with dimensions and materials according to the process fluid
• splitters for cooling and heat exchange between the electric bundle and the fluid
• Explosion Proof execution electric protection group and head
• Thermal sensors for regulation and safety of the system and heater.

The connection flange of the electric heater is defined and sized according to the customer already in the offer phase, so that the heater can be sized according to process data.

The design for this type of heater is carried out according to the functional data requested by the customer, and also considering and evaluating dimensional, physical, chemical and thermodynamic characteristics of the fluid to be heated, so as to guarantee a very precise and accurate choice of the sizing of the heater and building materials. The size of the flange depends on the electrical conditions imposed by the regulations for Atex execution.

The electrical power installed on Atex flanged electric heaters can vary up to thousands of kW with the aid of settings according to customer specifications, Reart engineering and reference standards for the sizing of heaters in Exd execution.

Usually, we can have the following reference design parameters for the sizing of the flange electric heaters:

• Flanges up to 24”(DN600) in accordance with UNI and ANSI B 16.5 specifications in carbon steels, stainless steels and nickel alloys.
• Diameter of the heating elements that form in the tube bundle 10 and 15 mm;
• Material of the heating elements in carbon steel, stainless steel 304-321 316 (L), or much more noble alloys such as Incoloy 800 or 825.
• Protection rating of the electrical enclosures of the heaters IP55, IP65, IP66;
• Installed electrical power up to 1.65MW per single heater.
• Maximum immersion length of the electric beam about 3 meters.

All electric flange heaters in Atex execution are equipped with thermal sensors such as thermostats and/or thermocouples or temperature probes (PT100) to protect the system and the heater itself in the event of abnormal or unexpected situations on the system.

Atex flanged heaters can be equipped with the following accessories:

1. 4-20mA temperature transmitters in SIL execution according to IEC 61508
2. Process control and safety sensors and heater (thermostats, PT100 temperature probes, thermocouples).
3. Power and safety cable glands in Exd execution
4. Electric control panel and heater control in a safe and classified area
5. Local command and control panel in classified area (Atex).
6. Anti-condensation heater (prevention against humidity)