Emerson EN-DFA Instruction Manual
Instruction Manual
D103585X012
February 2021
EN-DFA Series
EN-DFA Series Detonation Flame Arrestor
(EN ISO 16852 Certied)
Table of Contents
Introduction .................................................................. 1
Product Description .................................................... 2
Specifications .............................................................. 2
Principle of Operation .................................................. 3
Factors Affecting Flame Arrestor Performance ............ 5
Installation ................................................................... 8
Maintenance .............................................................. 10
Recommended Spare Parts ...................................... 12
Parts Ordering ........................................................... 12
Figure 1. Typical EN-DFA Series Detonation Flame Arrestor
WARNING
▲
Failure to follow these instructions or
to properly install and maintain this
equipment could result in an explosion,
re and/or chemical contamination
causing property damage and personal
injury or death.
Enardo™ detonation ame arrestor must
be installed, operated and maintained
in accordance with federal, state and
local codes, rules and regulations
and Emerson Process Management
Regulator Technologies Tulsa,
(Emerson) LLC instructions.
Failure to correct trouble could result in
a hazardous condition. Call a qualied
service person to service the unit.
Installation, operation and maintenance
procedures performed by unqualied
person may result in improper adjustment
and unsafe operation. Either condition may
result in equipment damage or personal
injury. Only a qualied person must install
or service the detonation ame arrestor.
Introduction
Scope of the Manual
This Instruction Manual provides instructions for
installation, startup, maintenance and parts ordering
information for the EN-DFA Series detonation
ame arrestor.
Flame Arrestor Classication
The ame arrestors within the scope of this
document have been tested and certied as unstable
detonation ame arrestors and are therefore suitable
for deagrations, stable detonations and unstable
detonations, as dened by EN ISO 16852:2016,
propagating along pipe into connecting pipework.
This is the highest performance rating available for a
detonation arrestor and it exceeds the performance
rating of an arrestor certied for stable detonations and
deagrations only.
Detonation ame arrestors may be used for open and
closed pipe work on the unprotected (“hot”) side.
North America Only
EN-DFA Series
Specications
The Specications table lists the specications for the detonation ame arrestors. The following information
is stamped on the nameplate attached to the arrestor: model number, ange size and rating, maximum initial
operating pressure, ISO reference number (International Standard), ISO type examination certicate, notied
body number, gas group, date of manufacture and serial number; other identication and customer tag number
are optional.
Available Constructions
See Table 1 and Figure 3
Operational Temperature (To)
-4 to 140°F / -20 to 60°C
(1)
Gas Group
IIA and IIB3
Flange Sizes and Rating
2 to 12 in. / 50 to 300 mm
Temperature Rating of Metal Reinforced Graphite
850°F / 450°C
Burning Time Rating
Less than 1 minute
CL150 RF and CL150 FF (standard)
Other connection ange sizes and ratings available
upon request
Housing Size
4 to 26 in. / 100 to 660 mm
Maximum Experimental Safe Gap (MESG)
Housing Material
Carbon steel, 304 Stainless steel,
316 Stainless steel and Hastelloy
Element Material
304 Stainless steel, 316 Stainless steel
and Hastelloy
®
See Table 4
EN Number (European Standard)
Maximum Initial Operating Pressure
EN ISO 16852:2016
See Table 5
1. The pressure/temperature limits in this Instruction Manual and any applicable standard or code limitation should not be exceeded.
Table 1. EN-DFA Series Detonation Flame Arrestor Available Construction (ATEX Approved)
MODEL
EN-DFA-0402 2 50 4 101
EN-DFA-0603 3 75 6.6 168
EN-DFA-0804 4 100 10 254
EN-DFA-1206 6 150 14 356
EN-DFA-1608 8 200 18 457
EN-DFA-2010 10 250 22 559
EN-DFA-2412 12 300 26 660
In. mm In. mm
FLANGE SIZE HOUSING SIZE
(1)
®
North America Only
Product Description
The EN-DFA Series detonation ame arrestor represents
the best value in ame arrestor protection. The
detonation ame arrestor provides protection against
ame propagation in piping systems that are manifolded
or have long run-up distances. These are typically
used for extended pipe length or multiple pipe bend
congurations to stop high pressures and ame velocities
with detonations and overdriven detonations. It also
stops conned and unconned, low and high pressure
Hastelloy® is a mark owned by Haynes International, Inc.
2
deagrations. The design is unique in the ability to
provide large ame channels which requires less frequent
maintenance and greater ease in cleaning when service
is required, translating to less down time. EN-DFA Series
detonation ame arrestors are bi-directional and proven
to stop an ignited ammable vapor mixture approaching
from either direction that can be travelling at subsonic
or supersonic velocities. The patented element oers
maximum ow to pressure drop characteristics enhancing
the value of the ame arrestor in any system.
EN-DFA Series
Figure 2. Cut-away view of EN-DFA Series Detonation Flame Arrestor
EN DFA / - -
Detonation
Flame
Arrestor
(Concentric)
Housing
Size
04 = 4 in.
through
26 = 26 in.
Connection
Size
02 = 2 in.
through
12 = 12 in.
IEC
Gas
Group
IIA (D)
IIB3 (C)
Housing
Material
C = Carbon Steel
4 = 304 SST
6 = 316 SST
H = Hastelloy
®
Element
Material
4 = 304 SST
6 = 316 SST
H = Hastelloy
Connection
F = Flat face
®
R = Raised
Type
ange
face
ange
Options
1 = Drain Plug
2 = Pressure Tap
3 = Temperature Probe
Tap (standard)
4 = Miscellaneous
5 = Protective coating
6 = Special feature
Figure 3. EN-DFA Series Detonation Flame Arrestor Available Constructions and Model Numbering System
The EN-DFA Series is designed with anged connections,
and the arrestor provides the option of the removal of the
ame cell element for easy cleaning and replacement
without disconnecting of the pipe connection.
Principle of Operation
Detonation ame arrestor prevents ame propagation
as it enters the exposed side of the unit to the
protected side by absorbing and dissipating heat
using spiral wound crimped ribbon ame cells.
This detonation ame arrestor utilizes a patented
element assembly that dampens the high velocities
and pressures associated with deagrations and
detonations while quenching the ame front. These
cells allow maximum ow with maximum protection.
Detonation ame arrestor has the heat capacity
and structural design to withstand all the dynamic
conditions of ame propagation and still stop the
ame. Detonation ame arrestor is used when the
ame can be in any of the detonation states.
Limits for Use
The operational temperature, T0, shall be limited
as follows:
-4°F ≤ T0 ≤ 140°F / -20°C ≤ T0 ≤ 60°C
The operation pressure, p0, shall be limited as follows:
See Table 5
Hastelloy® C is a mark owned by Haynes International, Inc.
Flame arrestor use shall be limited to gas-air mixtures
with an Maximum Experimental Safe Gap (MESG)
equal to or greater than that tested.
Additional Protection Measures: Flame arrestors
may be used with additional protection measures.
The overall safety of the combined installation shall
be accessed, taking account of any hazardous area
classication (zones) and the likelihood of additional
ignition sources.
Factors Aecting Flame
Arrestor Performance
Gas Group
The type of gas in the system determines its gas
grouping and therefore predetermines the type of
arrestor element required. The element must be
designed to accommodate the specic gas group that
could possibly ignite and propagate in the system.
The more explosive gases require the ame cell to
absorb the heat more quickly and eciently. The
International Electrotechnical Commission (IEC)
groups gases and vapors into Groups IIA through IIC
categories depending on a number of factors including
the MESG of the gas.
North America Only
3
EN-DFA Series
Flame Arrestors have installation and application limits
Type designation in accordance with EN ISO 16852:2016
DET 2 L
WARNING LABEL OF EN-DFA-0402/IIA THROUGH EN-DFA-1206/IIA (SEE TABLE 2)
Flame Arrestors have installation and application limits
Type designation in accordance with EN ISO 16852:2016
DET 2 L
WARNING LABEL OF EN-DFA-1608/IIA THROUGH EN-DFA-2412/IIA (SEE TABLE 2)
Flame Arrestors have installation and application limits
Type designation in accordance with EN ISO 16852:2016
DET 2 L
WARNING LABEL OF EN-DFA-0402/IIB3 THROUGH EN-DFA-2412/IIB3 (SEE TABLE 2)
/D = n/a
u
Ex. G IIA T
/D = n/a
u
Ex. G IIA T
/D = n/a
u
Ex. G IIB3 T
WARNING
BC: b; t
o
= 1 min
BT
= 60°C Po = 122.3 kPa (absolute)
WARNING
BC: b; t
o
= 1 min
BT
= 60°C Po = 116.3 kPa (absolute)
WARNING
BC: b; t
o
= 1 min
BT
= 60°C Po = 118.3 kPa (absolute)
HAZARDOUS LOCATIONS
Figure 4. Product Identification and Marking
North America Only
Figure 5. Marking Plate
4
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