A tubular flange heater product manufactured by St. Louis-based Watlow received additional IECEx ‘d’ flameproof certifications.

As modern manufacturing has increased the need for electric equipment in hazardous areas ― places where flammable liquids, vapors, gases or combustible dusts could present a fire or explosion hazard ― the IECEx has put in place a number of conformity assessment schemes to ensure that equipment and systems are manufactured and operated according international safety standards.

The principles of the flameproof concept include criteria such as no external hot surfaces above the temperature class; the design of the enclosure joints must comply with the requirements of the standard; parts fitted inside an enclosure may include sparking contacts, semiconductor devices and batteries; and flexible walls are not permitted.

As the company notes, achieving the additional IECEx ‘d’ certification provides Watlow’s customers with an additional assurance that the products are safe. Although prospective users should contact the company the complete list of IEC features, some of the available features include capability for Ex d IIC: T1-6 Gb; up to 176°F (80°C); enclosure/anti-condensation heaters; and IP66.

Watlow’s flange heaters are designed for heating liquids and gases in tanks, pressure vessels, vaporizers and similar for applications from 40 to 4,000 kW. They are made with tubular elements brazed or welded to a flange.