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Instruction Manual
D103810X012
January 2019
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
WArninG
!
Failure to follow these instructions or
to properly install and maintain this
equipment could result in an explosion,
fire and/or chemical contamination
causing property damage and personal
injury or death.
Fisher™ detonation flame 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 qualified
service person to service the unit.
installation, operation and maintenance
procedures performed by unqualified
person may result in improper
adjustment and unsafe operation. Either
condition may result in equipment
damage or personal injury. Only a
qualified person shall install or service
the flame arrestor.
Enardo DFA Series
Figure 1. Typical Enardo DFA Series Detonation Flame 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
flame arrestor.
Product Description
The Enardo DFA Series detonation flame arrestor
represents the best value in flame arrestor protection.
The detonation flame arrestor provides protection
against flame 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 configurations to stop high pressures and flame
velocities with detonations and overdriven detonations.
It also stops confined and unconfined, low and high
pressure deflagration. The design is unique in the ability
to provide large flame channels which requires less
frequent maintenance and greater ease in cleaning
when service is required, translating to less down time.
Enardo DFA Series detonation flame arrestors are
bi-directional and proven to stop an ignited flammable
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Summary of Contents for Emerson Enardo DFA Series
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Page 1: Table Of Contents
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 introduction WArninG Scope of the Manual Failure to follow these instructions or... -
Page 2: Specifications
3. Not all models are available with USCG and ATEX certifications. Contact your local Sales Office for more information. 4. USCG and ATEX approval report(s) are available upon request. 5. Flow test data available upon request. Table 1. Enardo DFA Series Detonation Flame Arrestor Available Construction (USCG/ATEX Approved) FLAnGE SiZE HOUSinG SiZE... - Page 3 6 = Special feature Note: Not all models are available with USCG and ATEX certifications. Contact your local Sales Office for more information. Figure 3. Enardo DFA Series Detonation Flame Arrestor Available Constructions and Model Numbering System Markings nameplate information...
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Page 4: Principle Of Operation
- Carbon Disulphide, due to its special properties; in any system. - Mixtures other than gas-air or vapor-air mixtures The Enardo DFA Series is designed with flanged (e.g. higher oxygen-nitrogen ratio, chlorine as connections, the arrestor provides the option of the oxidant, etc.) - Page 5 Enardo DFA Series Pipe Length The type of gas in the system determines its gas grouping and therefore predetermines the type of Extended lengths of pipe allow the flame to advance arrestor element required. The element must be into more severe states of flame propagation such designed to accommodate the specific gas group that as high pressure deflagration and detonations.
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Page 6: Installation
Detonation Flame Arrestors covered within the scope of this document. Connection Enardo DFA Series are normally provided with CL150 WArninG raised or flat faced flanges. Other flanges such as CL300 are sometimes provided on special request. Make sure... -
Page 7: Maintenance
Models that have drain plugs are designed for horizontal The Enardo DFA Series detonation flame arrestor may installation and should be installed with the drain plugs be installed in any vapor control line that is smaller aligned at the bottom of the unit. - Page 8 5. Replace the flame element assembly with a new Under no circumstance shall any element assembly or properly cleaned and inspected assembly not provided by Emerson existing unit. be used in this assembly. Failure to 6. Locate the flame cell assembly such that it seats use the correct screens may lead to onto the gaskets.
- Page 9 Enardo DFA Series 36 40 Figure 5. Flange Pattern Tightening Sequence Table 4. Tightening Steps and Torque Values for Internal Flanges TiGHTEninG STEPS AnD TOrQUE (FT-LBS / N•m) MODEL PATTErn BOLT SiZE Enardo DFA-300.5 5/8-11 Snug 20 / 27 40 / 54...
- Page 10 Enardo DFA Series Table 6. Torque Values for Raised Face Connection Flange (Steel Only) BOLT DiAMETEr TOrQUE nOMinAL PiPE nUMBEr OF BOLTS DiAMETEr Ft-lbs N•m 0.50 12.70 12.20 1-1/4 0.50 12.70 17.63 1-1/2 0.50 12.70 24.40 0.63 16.00 47.45 2-1/2 0.63...
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Page 11: Recommended Spare Parts
Enardo DFA Series Procedure 1. Loosen all outermost nuts on tension studs. 2. Tighten the inside jacking nuts on the tension 1. Use studs and nuts that are free of visible studs forcing the two conical sections apart. When contamination and corrosion. - Page 12 Technologies, Inc. All rights reserved. 01/19. Emerson Automation Solutions The Emerson logo is a trademark and service mark of Emerson Electric Co. All other marks are the property of their prospective owners. Fisher™ is a mark owned by Fisher Controls International LLC, a...