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In-Line Deflagration Flame Arrester

concentric design, bidirectional

Function and Description

The compact design of the PROTEGO® FA-G in-line deflagration flame arrester makes it the state of the art technology for installation in pipes with diameters of up to 2”. The devices are installed with minimal distance to the burner to prevent flashback in to the fuel feed lines. When installing the deflagration flame arrester, make sure that the distance between potential ignition sources and the location of the installed device, does not exceed the L/D ratio (pipe length/pipe diameter), for which the device was approved. As per EN ISO 16852 the L/D ratio is limited to (L/D)max ≤ 50 for deflagration flame arresters of explosion groups IIA and IIB3 (NEC groups D and C (MESG ≥ 0.65 mm)) and to (L/D)max ≤ 30 for explosion group IIC (NEC group B).

The in-line deflagration flame arrester is symmetrical and offers bidirectional flame transmission protection. The device consists of two housing parts (1) and a PROTEGO® flame arrester unit or a FLAMEFILTER® (2) and spacers in the center. The number of FLAMEFILTER® discs and their gap size are determined by the operating data and parameters of the mixture flowing in the line (explosion group, pressure, temperature). The PROTEGO® FA-G series in-line deflagration flame arresters is available for explosion groups IIA, IIB3 and IIC (NEC groups D, C (MESG ≥ 0.65 mm) and B).

The standard design can be used up to an operating temperature of +60°C / 140°F and an absolute operating pressure acc. to table 3. Devices with special approval can be obtained for higher pressures and higher temperatures upon request.

Type-approved in accordance with the current ATEX Directive and EN ISO 16852 as well as other international standards.

Features and Advantages

  • different application possibilities
  • modular design
  • the individual FLAMEFILTER® can be quickly removed and installed
  • threaded connection for direct mounting into pipeline
  • bidirectional flame transmission proof design
  • protects against deflagrations for all explosion groups
  • use of temperature sensors for G 1½" and 2" is possible
  • cost efficient spare parts

Dimensions

To select the nominal size (DN), use the flow capacity charts on the following pages

DN G ½" G ¾" G 1" G 1 ¼"G 1 ½" G 2"
a80 / 3.1580 / 3.15100 / 3.94100 / 3.94155 / 6.10155 / 6.10
b55 / 2.1755 / 2.1776 / 2.9976 / 2.99124 / 4.88124 / 4.88
c (IIA bis IIB3)100 / 3.94100 / 3.94110 / 4.33110 / 4.33170 / 6.69170 / 6.69
c (IIB und IIC)112 / 4.41112 / 4.41122 / 4.80122 / 4.80170 / 6.69170 / 6.69
d400 / 15.75400 / 15.75
SW32 / 1.2632 / 1.2650 / 1.9750 / 1.9775 / 2.9575 / 2.95
DN G ½" G ¾" G 1" G 1 ¼"G 1 ½" G 2"
a80 / 3.1580 / 3.15100 / 3.94100 / 3.94155 / 6.10155 / 6.10
b55 / 2.1755 / 2.1776 / 2.9976 / 2.99124 / 4.88124 / 4.88
c (IIA bis IIB3)100 / 3.94100 / 3.94110 / 4.33110 / 4.33170 / 6.69170 / 6.69
c (IIB und IIC)112 / 4.41112 / 4.41122 / 4.80122 / 4.80170 / 6.69170 / 6.69
d400 / 15.75400 / 15.75
SW32 / 1.2632 / 1.2650 / 1.9750 / 1.9775 / 2.9575 / 2.95

Dimensions in mm / inches, SW= width across flats

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Material selection

DesignBC
HousingStainless SteelHastelloy
GasketPTFEPTFE
FLAMEFILTER®*Stainless SteelHastelloy
DesignBC
HousingStainless SteelHastelloy
GasketPTFEPTFE
FLAMEFILTER®*Stainless SteelHastelloy

* the FLAMEFILTER® is also available in the materials Tantalum, Inconel, Copper, etc. when the listed housing materials are used.Special materials upon request

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Selection of explosion group

MESGExpl. Gr. (IEC / CEN)Gas Group (NEC)
> 0,90 mmIIAD
≥ 0,65 mmIIB3C
< 0,50 mmIICB
MESGExpl. Gr. (IEC / CEN)Gas Group (NEC)
> 0,90 mmIIAD
≥ 0,65 mmIIB3C
< 0,50 mmIICB

Special approvals upon request

Selection of max. operating pressure

Expl. GrDN  G ½" G ¾"  G 1"  G 1¼"  G 1½"  G 2'' 
IIAPmax1,4 / 20.31,4 / 20.31,4 / 20.31,4 / 20.31,5 / 21.71,5 / 21.7
IIB3Pmax1,2 / 17.41,2 / 17.41,2 / 17.41,2 / 17.41,2 / 17.41,2 / 17.4
IICPmax1,1 / 15.91,1 / 15.91,1 / 15.91,1 / 15.91,1 / 15.91,1 / 15.9
Expl. GrDN  G ½" G ¾"  G 1"  G 1¼"  G 1½"  G 2'' 
IIAPmax1,4 / 20.31,4 / 20.31,4 / 20.31,4 / 20.31,5 / 21.71,5 / 21.7
IIB3Pmax1,2 / 17.41,2 / 17.41,2 / 17.41,2 / 17.41,2 / 17.41,2 / 17.4
IICPmax1,1 / 15.91,1 / 15.91,1 / 15.91,1 / 15.91,1 / 15.91,1 / 15.9

Pmax = maximum allowable operating pressure in bar / psi absolute, higher operating pressure upon request

Specification of max. operating temperature

≤ 60°C / 140°FTmaximum allowable operating temperature in °C
-Designation
≤ 60°C / 140°FTmaximum allowable operating temperature in °C
-Designation

higher operating temperatures upon request

Type of connection

Pipe thread DIN ISO 228-1DIN
Pipe thread DIN ISO 228-1DIN

other types of thread upon request

Design Types and Specifications

There are three different designs:

Basic in-line deflagration flame arrester (G ½" to 2")

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In-line deflagration flame arrester with integrated temperature sensor* for additional protection against short-time burning from one side (G 1½" to 2")

FA-G - T

In-line deflagration flame arrester with two integrated temperature sensors* for additional protection against short-time burning from both sides (G 1½" to 2")

FA-G - TB

Basic in-line deflagration flame arrester (G ½" to 2")

FA-G - –

In-line deflagration flame arrester with integrated temperature sensor* for additional protection against short-time burning from one side (G 1½" to 2")

FA-G - T

In-line deflagration flame arrester with two integrated temperature sensors* for additional protection against short-time burning from both sides (G 1½" to 2")

FA-G - TB

Additional special devices available upon request
*Resistance thermometer for device group II, category (1) 2 (GII cat. (1) 2)

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Flow Capacity Chart

The flow capacity charts have been determined with a calibrated and TÜV certified flow capacity test rig. Volume flow V in (m³/h) and CFH refer to the standard reference conditions of air ISO 6358 (20°C, 1bar). Conversion to other densities and temperatures refer to Vol. 1: “Technical Fundamentals”.

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