DFB Series

In-Line Deflagration Arrester with Replaceable Element

Application

The Elmac Technologies^® DFB in-line deflagration arresters are designed to prevent propagation of flames in gas or vapour mixtures. By locating the arrester in close proximity to the potential source of ignition, any flame or explosion is confined to the immediate area. DFB arresters are supplied as complete units ready for direct installation into piping systems. In the context of the Pressure Equipment Directive (PED), Elmac flame arresters are classified as a piping assembly.

Principle of Operation

A flame arrester uses an element with small apertures which allows gas or vapour to pass. If the apertures are smaller than the maximum experimental safe gap (MESG) for the gas or vapour then a flame cannot pass through the arrester, and is subsequently contained or extinguished.

Benefits

• Variety of sizes and materials to suit a wide range of applications
• Variants available for different operating temperature ranges
• Replaceable elements
• Bi-directional
• The Elmac technical team can advise on specific location queries

Gas Groups

Elmac flame arresters in the DFB range are for use with gases in Groups I, IIA, IIB1, IIB2, and IIB3.

General Layout

Body Gaskets Fasteners Element

Material Specifications

Dimensions

Operating Limits*

*Minimum service temperature: -20 °C

Pressure Drop & Flow Curves

Pressure drop information and flow curve charts for the DFB Series arresters can be found in the DFB product datasheet in the Data Centre.

Variations

The DFB series of in-line flame arresters has the following options:

• Drain plugs
• Jacking screws
• Sockets for instrumentation

Standards Compliance

All flame arresters have been tested and certified in accordance with national or international standards. Actual device performance is verified in the Elmac Technologies "state of the art" in-house test facility.

Elmac Technologies has been independently assessed by a notified body against the requirements of the ATEX Directive 94/9/EC. Elmac flame arresters meet the criteria and are supplied with CE and EX markings, an EC Declaration of Conformity and an EC Type Examination Certificate.

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