Emerson DFA-0803, DFA-0802, DFA-1004, DFA-1206, DFA-2010 Instruction Manual

Instruction Manual
D103810X012

January 2019

Enardo DFA Series

Enardo DFA Series Detonation Flame
Arrestor (USCG/ATEX Approved)

Table of Contents

Introduction ..................................................................1

Specifications ..............................................................2

Principle of Operation .................................................. 4

Factors Affecting Flame Arrestor Performance ............4

Installation ...................................................................6

Maintenance ................................................................ 7

Recommended Spare Parts ...................................... 11

Parts Ordering ........................................................... 11

Figure 1. Typical Enardo 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.

Fisher™ 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, LLC instructions.

Failure to correct trouble could result in

a hazardous condition. Call a qualied

service person to service the unit.
Installation, operation and maintenance

procedures performed by unqualied

person may result in improper
adjustment and unsafe operation. Either
condition may result in equipment
damage or personal injury. Only a

qualied person shall install or service
the ame arrestor.

Introduction

Scope of the Manual

This Instruction Manual provides instructions for
installation, startup, maintenance and parts ordering
information for the Enardo DFA Series detonation

ame arrestor.

Product Description

The Enardo 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 congurations to stop high pressures and ame
velocities with detonations and overdriven detonations.
It also stops conned and unconned, low and high
pressure deagration. 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.
Enardo DFA Series detonation ame arrestors are
bi-directional and proven to stop an ignited ammable

Outside North America Only

Enardo DFA Series

Specications

The Specications table lists the specications for the detonation ame arrestors. Some, or all, of the following
information is stamped on the nameplate attached to the arrestor: model number, ange size and rating, maximum initial
operating pressure, EN number (European Standard), EU type examination certicate, notied body number, gas group,
date of manufacture and serial number; other identication and customer tag number are optional.

Available Constructions

See Table 1 and Figure 3

Temperature Rating of Gasket

Fiber Gaskets (standard): 450°F / 232°C
Graphite/Metal (optional): 1600°F / 870°C

Gas Group

D (IIA), C (IIB3) and B(IIC)

Burning Rating

See Table 3

Flange Sizes and Rating

1 to 24 in. / 50 to 600 mm
CL150

Housing Material

Carbon steel, 304 Stainless steel,
316 Stainless steel and Hastelloy

Housing Size

4 to 48 in. / 100 to 1200 mm

Element Material

304 Stainless steel, 316 Stainless steel

Maximum Experimental Safe Gap (MESG)

See Table 2

Maximum Initial Operating Pressure

(1)

See Table 3

and Hastelloy

Certication

(3)

EN 12874 ATEX Certied
U.S. Coast Guard (USCG) Approved

Maximum Ambient Air Temperature

140°F / 60°C

1. The pressure/temperature limits in this Instruction Manual and any applicable standard or code limitation should not be exceeded.

2. Hastelloy® housings and element material are not USCG approved.

3. Not all models are available with USCG and ATEX certications. Contact your local Sales Ofce for more information.

4. USCG and ATEX approval report(s) are available upon request.

5. Flow test data available upon request.

(1)

®(2)

®(2)

(4)(5)

(4)(5)

Table 1. Enardo DFA Series Detonation Flame Arrestor Available Construction (USCG/ATEX Approved)

(2)

MODEL

Enardo DFA-0401 1 25 4 100

Enardo DFA-0602

Enardo DFA-0802 2 50 8 200

Enardo DFA-0803 3 75 8 200

Enardo DFA-1004 4 100 10 250

Enardo DFA-1206 6 150 12 300

Enardo DFA-1608 8 200 16 400

Enardo DFA-2010 10 250 20 500

Enardo DFA-2412 12 300 24 600

Enardo DFA-2814 14 350 28 700

Enardo DFA-3016 16 400 30 750

Enardo DFA-3418 18 450 34 850

Enardo DFA-3620 20 500 36 900

Enardo DFA-4824

1. Not all models are available with USCG and ATEX certifications. Contact your local Sales Office for more information.

2. Includes eccentric construction.

3. Eccentric construction not USCG or ATEX certified.

®

Hastelloy

is a mark owned by Haynes International, Inc.

2

(3)

(3)

FLANGE SIZE HOUSING SIZE USCG ATEX

In. mm In. mm D C B IIA IIB3

2 50 6 150

24 600 48 1200

(1)

Outside North America Only

 

 

   

   

   

   

   

   

   

   

   

   



Figure 2. Cut-away view of Enardo DFA Series Detonation Flame Arrestor

/ - -

Detonation

Flame

Arrestor

Enardo DFA =

Concentric

Enardo DFAE =

Eccentric

Note: Not all models are available with USCG and ATEX certifications. Contact your local Sales Office for more information.

Housing

Size

04 = 4 in.

through

48 = 48 in.

Connection

Size

01 = 1 in.

through

24 = 24 in.

NEC

Gas

Group

D (IIA)
C (IIB3)
B (IIC)

Housing

Material

C = Carbon steel
4 = 304 SST
6 = 316 SST

H = Hastelloy

®(1)

Element
Material

4 = 304 SST
6 = 316 SST

H = Hastelloy

Enardo DFA Series

Connection

F = Flat face

®(2)

R = Raised face

Type

flange

flange

Options

1 = Drain Plug
2 = Pressure Tap
3 = Temperature Probe Tap
4 = Miscellaneous

5 = Protective coating

6 = Special feature

Figure 3. Enardo DFA Series Detonation Flame Arrestor Available Constructions and Model Numbering System

Markings

Nameplate Information

A nameplate will be attached to the arrestor and will
contain the following information:

• Model Number: Ex. DFA 1206/D (see model

information above)

• Flange Size and Rating: Ex. 6 in. CL150

• Maximum Initial Operating Pressure, P

• EN Number: Ex. ISO EN 16852 (if applicable) or

EN 12874

• EU Type Examination Certificate (if applicable)

• Notified Body Number (if applicable): Ex. 0518

• Gas Group: Ex. IIA or IIB3, D, C

• Date of Manufacture

• Serial Number

• Other Identification (Optional)

• Customer Tag Number (Optional)

O

Outside North America Only

HAZARDOUS LOCATIONS

Figure 4. Product Identification and Marking for ATEX Units

®

is a mark owned by Haynes International, Inc.

Hastelloy

1. Hastelloy® housings are not USCG approved.

2. Hastelloy® element material is not USCG approved.

3

Enardo DFA Series

Table 2. Maximum Experimental Safe Gap (MESG)

NATIONAL ELECTRIC

CODE (NEC)

Group D Group IIA 0.035 >0.90 Propane

Group C Group IIB3 0.026 ≥0.65 Ethylene

Group B Group IIC 0.020 <0.50 Hydrogen

DETONATION

FLAME ARRESTOR

MODEL

Enardo DFA***/D 2 to 12 50 to 300 D (IIA) 22.7 1.56 Unstable Stabilized Type 1 (2 hours)

Enardo DFA***/D 14 to 20 350 to 500 D (IIA) 20.7 1.43 Unstable Stabilized Type 1 (2 hours)

Enardo DFA***/D 24 600 D (IIA) 16.0 1.1 Unstable N/A Type 2 (15 minutes)

Enardo DFAE***/D 2 to 20 50 to 500 D (IIA) 20.7 1.43 Unstable 1 minute Type 2 (15 minutes)

Enardo DFA***/C 2 to 20 50 to 500 C (IIB3) 20.7 1.43 Unstable Stabilized Type 1 (2 hours)

Enardo DFAE***/C 2 to 20 50 to 500 C (IIB3) 20.7 1.43 Unstable 1 minute Type 2 (15 minutes)

INTERNATIONAL

ELECTROTECHNICAL

COMMISSION (IEC)

GROUP

Table 3. Detonation Arrestor Size Ranges and Rating, Maximum Initial Pressure and Burn Rating

DETONATION

FLAME ARRESTOR

SIZE RANGE

In. mm psia bar a ATEX (EN 12874) USCG

GAS GROUP

In. mm

MESG

MAXIMUM INITIAL

PRESSURE

DETONATION

RATING

TEST GAS LIST

BURN RATING

vapor mixture approaching from either direction that can
be travelling at subsonic or supersonic velocities. The
patented element offers maximum ow to pressure drop
characteristics enhancing the value of the ame arrestor
in any system.

The Enardo DFA Series is designed with anged

connections, the arrestor provides the option of the

removal of the ame cell element for easy cleaning and
replacement without disconnecting 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 an element assembly that dampens the high
velocities and pressures associated with deagration 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 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 of Use for Detonation/Deagration

Flame Arrestors:

• The following vapors are not within the scope of the
products covered by this IOM:

- Explosive mixtures of vapors and gases, which tend
to self-decompose (e.g. Acetylene) or which are
chemically unstable

- Carbon Disulphide, due to its special properties;

- Mixtures other than gas-air or vapor-air mixtures

(e.g. higher oxygen-nitrogen ratio, chlorine as
oxidant, etc.)

• Minimum distance between flame arrestor connection
and a restriction on the protected side is 10 L/D, but
not less than 3 m.

• Arrestors shall only be installed into piping with a
nominal size that is smaller than or equal to the
nominal size of the flame arrestor connection.

Factors A󰀨ecting Flame

Arrestor Performance

Gas Group

WARNING

!

Methanol is classied as a Group-D (IIA)

vapor. However, our lab tests indicate
that methanol exhibits characteristics
unlike other Group-D (IIA) vapors
under certain conditions. We therefore
recommend that an arrestor rated for

Group-C (IIB3) vapors be specied for

methanol service.

Outside North America Only

4