Flame and Detonation Arrestors

Solenoid Valves
Burner Equipment
Oil in Water Monitors
Combustion Safety Controllers
Burner Equipment
Floating Roofs and Seal Systems
Pressure Vacuum Relief Valve
Emergency Pressure Relief Vent
Gauge and Thief Hatches
Bursting Discs
Water Draw Off Valve
Safety Relief Valves
Blanketing Valves
Environmental & Safety Equipment
Vortex Flow Straighter Assembly
Specialty Products
Flare Stacks
Zirco Index Header

Detonation Flame Arrestor

Applications
ENARDO Detonation Flame Arrestors provide protection against flame propagation in piping systems that are manifolded or have long run-up distances. Our design is unique in the ability to provide larger flame channels that allow for less frequent plugging and easier cleaning when service is required—both of which translate to less down time.

ENARDO Detonation Flame Arrestors are bi-directional and proven to stop an ignited flammable vapor mixture approaching from either direction and traveling at subsonic or supersonic velocities. Our patented element offers maximum flow to pressure drop characteristics.

Features

  • Connection: flanged
  • Housing material: carbon steel and stainless steel
  • Size: 1/2" (13 mm) through 36" (900 mm)
  • Special material and protective coatings available
  • Agency approvals: U.S. Coast Guard, ATEX

Technical Specs
Data Sheets

Flame Arrestor Certifications

Available Approvals for Deflagration Flame Arrestors*

Series 7 Deflagration Arrestors

Model

Group IIA (D)

Group IIB3(C)

ATEX
EN 12874

Factory Mutual

ATEX
EN 12874

70402

X

X

X

70602

X

 

X

70603

X

X

X

70803

X

 

X

70804

X

X

X

71204

X

 

X

71206

X

X

X

71606

X

 

X

71608

X

X

X

72008

X

 

X

72010

X

X

X

72410

X

 

X

72412

X

X

X

* Applicable approvals must be specified prior to manufacture and will be indicated on the product nameplate.


Available Approvals for Free Vent Flame Arrestors*

Free Vent Flame Arrestor (FVFA)

Model

Group IIA (D)

Group IIB3(C)

ATEX
EN 12874

ATEX
EN 12874

402

X

X

602

X

X

603

X

X

803

X

X

804

X

X

1204

X

X

1206

X

X

1606

X

X

1608

X

X

2008

X

X

2010

X

X

2410

X

X

2412

X

X

* Applicable approvals must be specified prior to manufacture and will be indicated on the product nameplate.


Available Approvals for Detonation Arrestors*

Detonation Flame Arrestor - Group D (IIA)

Model

Type of Detonation

ATEX
w/Short Time Burn Rating

U.S. Coast Guard and
ATEX/U.S. Coast Guard
w/ Endurance Burn Rating**

DFA 402

UNSTABLE

X

 

DFA 602

UNSTABLE

X

X

DFA 603

UNSTABLE

X

 

DFA 803

UNSTABLE

X

X

DFA 804

UNSTABLE

X

 

DFA 1004

UNSTABLE

 

X

DFA 1204

UNSTABLE

X

X

DFA 1206

UNSTABLE

X

X

DFA 1608

UNSTABLE

X

X

DFA 2010

UNSTABLE

X

X

DFA 2412

UNSTABLE

X

X

DFA 2814

UNSTABLE

 

X

DFA 3016

UNSTABLE

 

X

DFA 3418

UNSTABLE

 

X

DFA 3620

UNSTABLE

 

X


 

Detonation Flame Arrestor - Group C (IIB3)

Model

Type of Detonation

ATEX
w/Short Time Burn Rating

U.S. Coast Guard and
ATEX/U.S. Coast Guard
w/ Short Time Burn Rating

DFA 402

UNSTABLE

X

 

DFA 602

UNSTABLE

X

X

DFA 603

UNSTABLE

X

 

DFA 803

UNSTABLE

X

X

DFA 804

UNSTABLE

X

 

DFA 1004

UNSTABLE

 

X

DFA 1204

UNSTABLE

X

X

DFA 1206

UNSTABLE

X

X

DFA 1608

UNSTABLE

X

X

DFA 2010

UNSTABLE

X

X

DFA 2412

UNSTABLE

X

X

DFA 2814

UNSTABLE

 

X

DFA 3016

UNSTABLE

 

X

DFA 3418

UNSTABLE

 

X

DFA 3620

UNSTABLE

 

X

* Applicable approvals must be specified prior to manufacture and will be indicated on the product nameplate.

** Endurance burn rating applicable only to concentric configuration.

 

Data Sheets

Flame Arrestor Selection Guide

Choosing the proper flame arrestor is critical to the safety of equipment and personnel. Consult the table below to select the product which best fits your needs, taking into account vent/piping layout and gas group.

ENARDO Standard Flame Arrestor Selection Criteria

Including US Coast Guard and ATEX/US Coast Guard certified detonation arrestors

NEC Group "D" or IEC Group IIA Gases

Parameters End-of-Line
FVFA & SVFA
In-Line
(Standard)
S7 HP & IL
In-Line HP
Deflag. S8
Detonation Arrestor DFA
Length of pipe between the arrestor and the ignition source without bends (Mounted on end of pipe) 20 feet
(6 meters)
60 feet
(18 meters)
Unlimited
Length of pipe between the arrestor and the ignition source with one 90° bend (Mounted on end of pipe) 20 feet
(6 meters)
60 feet
(18 meters)
Unlimited
Length of pipe between the arrestor and the ignition source with multiple bends (Mounted on end of pipe) Not recommended with multiple bends Not recommended with multiple bends Unlimited
Flame stabilization at stoichiometric mixture and ambient temperature not to exceed 140°F (60°C) * 5 minutes
(minimum)
5 minutes
(minimum) 30 minutes (Factory Mutual Approved units)
15 minutes
(minimum)
2 hours
(concentric)
Operating Pressure Atmospheric 15.4 psia
(106 kPa)
19.7 psia
(134 kPa)
Conc. 3"-12" (22.7 psia) (75-300mm) 157 kPa
 
Conc. 2", 14"-20" (20.7 psia) (50, 350-500mm) 143 kPa

NEC Group "C" or IEC Group IIB3 Gases

Parameters End-of-Line
FVFA & SVFA
In-Line
(Standard)
S7 HP & IL
In-Line HP
Deflag. S8
Detonation Arrestor DFA
Length of pipe between the arrestor and the ignition source without bends (Mounted on end of pipe) 6 feet
(2 meters)
(open-ended pipe)
35 feet
(10.6 meters)
Unlimited
Length of pipe between the arrestor and the ignition source with one 90° bend (Mounted on end of pipe) 6 feet
(2 meters)
(open-ended pipe)
35 feet
(10.6 meters)
Unlimited
Length of pipe between the arrestor and the ignition source with multiple bends (Mounted on end of pipe) Not recommended with multiple bends Not recommended with multiple bends Unlimited
Flame stabilization at stoichiometric mixture and ambient temperature not to exceed 140°F (60°C) * 5 minutes
(minimum)
5 minutes
(minimum)
15 minutes
(minimum)
15 minutes
(minimum)
Operating Pressure Atmospheric 15.4 psia
(106 kPa)
16.7 psia
(115 kPa)
Conc. (2"-20") 20.7 psia (50-500mm) 143 kPa
 
Ecc. (3"-20") 18.7 psia (75-500mm) 129 kPa

NEC Group "B" or IEC Group IIC Gases (Except Acetylene)

Parameters End-of-Line
FVFA & SVFA
In-Line
(Standard)
S7 HP & IL
In-Line HP
Deflag. S8
Detonation Arrestor DFA
Length of pipe between the arrestor and the ignition source without bends (Mounted on end of pipe) 4 feet
(1.2 meters)
(open-ended pipe)
15 feet
(4.5 meters)
Unlimited
Length of pipe between the arrestor and the ignition source with one 90° bend (Mounted on end of pipe) Not recommended with a bend 15 feet
(4.5 meters)
Unlimited
Length of pipe between the arrestor and the ignition source with multiple bends (Mounted on end of pipe) Not recommended with multiple bends Not recommended with multiple bends Unlimited
Flame stabilization at stoichiometric mixture and ambient temperature not to exceed 140°F (60°C) * 2 minutes
(minimum)
2 minutes
(minimum)
15 minutes
(minimum)
15 minutes
(minimum)
Operating Pressure Atmospheric 15.4 psia
(106 kPa)
16.7 psia
(115 kPa)
Conc. 2"-6" (17.7 psia)
(50mm-150mm) 122 kPa

* Unlimited burning should not be allowed in any flame arrestor regardless of its burn time rating. We recommend the use of flame sensors, along with an appropriate means of extinguishing the fire, in any situation where a stabilized burn may occur.

ENARDO ATEX Certified Flame Arrestor Selection Criteria

See above for information on ATEX/US Coast Guard detonation arrestor selection criteria.

IEC Group IIA Gases or NEC Group "D"

Parameters End-of-Line
FVFA
In-Line
(Standard)
S7 HP & IL
Detonation Arrestor DFA
Length of pipe between the arrestor and the ignition source. (Mounted on end of pipe) 2" (50 mm) - 6.5 ft (2 m)
3" (75 mm) - 7.5 ft (2.3 m)
4" (100 mm) - 10 ft (3 m)
6" (150 mm) - 13.1 ft (4 m)
8" (200 mm) - 13.3 ft (4 m)
10" (250 mm) - 16.6 ft (5 m)
12" (300 mm) - 19.7 ft (6 m)
2" - 12"
(50mm-300mm)
 
Unrestricted
(Designed for Unstable Detonations)
Flame stabilization at stoichiometric mixture and ambient temperature not to exceed 140°F (60°C) Short Time Burn Rating Short Time Burn Rating Short Time Burn Rating
Operating Pressure Atmospheric 15.95 psia
(110 kPa)
2"-6" 17.7 psia
(50 mm-150 mm 122 kPa)
8 - 12" 16.9 psia
(200 mm - 300 mm 116.5 kPa)

IEC Group IIB3 Gases or NEC Group "C"

Length of pipe between the arrestor and the ignition source. (Mounted on end of pipe) 2" (50 mm) - 8.3 ft (2.5 m)
3" (75 mm) - 12.5 ft (3.8 m)
4" (100 mm) - 16.6 ft (5 m)
6" (150 mm) - 25 ft (7.6 m)
8" (200 mm) - 33.3 ft (10.16 m)
10" (250 mm) - 39.3 ft (12 m)
12" (300 mm) - 39.4 ft (12 m)
2" - 12"
(50mm-300mm)
 
Unrestricted
(Designed for Unstable Detonations)
Flame stabilization at stoichiometric mixture and ambient temperature not to exceed 140°F (60°C) Short Time Burn Rating Short Time Burn Rating Short Time Burn Rating
Operating Pressure Atmospheric 15.95 psia
(110 kPa)
17.2 psia
(118.3 kPa)

Gas Group Chart

Group A   Group D (continued)
Acetlyene   Ethanol (ethyl alcohol)
    Ethyl acetate
Group B (IIC)   Ethyl acrylate
Butadiene   Ethylene dichloride
Ethylene oxide   Gasoline
Hydrogen
   Manufactured gases containing more
   than 30% Hydrogen (by volume)
  Heptanes
Propylene oxide   Hexanes
Propyl nitrate   Isoprene
    Methane (natural gas)
Group C (IIB3)   Methyl acrylate
Acetaldhyde   Methylamine
Cyclopropane   Methyl ethyl ketone
Diethyl ether   Methyl mercaptan
Dimethyl hydrazine   3-Methyl-1-butanol (isoamyl alcohhol)
Ethylene   Methyl isobutyl ketone
Hydrogen sulfide   2-Methyl-1-propanol (isobutyl alcohol)
* Methanol (methyl alcohol)   2-Methyl-2-propanol (tertiary butyl alcohol)
Methyl mercaptan   Naphtha (petroleum)
Unisymmetrical dimethyl hydrazine (UDMN)   N-Propyl acetate
    Octanes
Group D (IIA)   Pentanes
Acetone   1-Pentanol (amyl alcohol)
Acrylonitrile   Propane
Ammonia   1-Propanol (propyl alcohol)
Benzene   2-Propanol (isopropyl alcohol)
Butylene   Propylene
1-Butanol (butyl alcohol)   Styrene
2-Butanol (secondary butyl alcohol)   Toluene
Cyclohexane   Turpentine
N-Butyle acetate   Vinyl acetate
Isobutyl acetate   Vinyl chloride
Ethane   Xylenes

Data Sheets

Free Vent Flame Arrestor

Applications
ENARDO Free Vent Flame Arrestors (FVFA) are designed to allow free venting in combination with flame protection for vertical vent applications. These arrestors are installed at the top of an atmospheric vent line or storage tank. They are typically used for end-of-the-line applications when the system operating pressure is near atmospheric levels and when there is minimal probability of a flame stabilizing on the flame arrestor element for an extended period.

Features

  • Connection: flanged
  • Housing material: aluminum, carbon steel and stainless steel
  • Size: 3/4" (20 mm) through 36" (900 mm)
  • Special material and protective coatings available
  • Agency Approvals: ATEX

Technical Specs
Data Sheets

Series 7 Flame Arrestor

Applications
ENARDO Series 7 In-Line Flame Arrestors are designed to stop the propagation of confined low-pressure deflagrations. The Series 7 is typically used for end-of-line and near end-of-line applications when the system operating pressure is near atmospheric levels and when there is minimal probability of a flame stabilizing on the flame arrestor element for an extended period.

Features

  • Connection: flanged
  • Housing material: aluminum, carbon steel and stainless steel
  • Size: ½" (12 mm) through 36" (900 mm)
  • Special material and protective coatings available
  • Agency approvals: FM, ATEX

Technical Specs
Data Sheets

Series 8 Deflagration

Applications
ENARDO Series 8 High-Pressure Deflagration Arrestor is designed to protect against high velocity and pressure flame fronts inherent in applications beyond the performance range of a standard flame arrestor but not yet to the detonation phase of flame development. The Series 8 surpasses standard flame arrestors for applications that include extended lengths of pipe with one bend, elevated operating pressures, and extended flame stabilization on the flame cell element.

Features

  • Connection: flanged
  • Housing material: carbon steel and stainless steel
  • Size: 1" (25 mm) through 36" (900 mm)
  • Special material and protective coatings available

Technical Specs
Data Sheets

Series 8800 and 9900 Vent Stack Flame Arrestors

Applications
ENARDO Vent Stack Flame Arrestors are designed to allow free venting in combination with flame protection for vertical vent applications. The arrestor is installed at the top of an atmospheric vent line or storage tank. It is typically used for end-of-line applications when the system operating pressure is near atmospheric levels and when there is minimal probability of a flame stabilizing on the flame arrestor element for an extended period.

Features

  • Connection: threaded or flanged
  • Housing material: aluminum, carbon steel and stainless steel
  • Size: 1/2" (13 mm) through 6" (150 mm)
  • Removable flame cell

Technical Specs
Data Sheets

Threaded In-Line Flame Arrestors

Applications
ENARDO Threaded In-Line Flame Arrestors are typically used for end-of-line and near end-of-line applications when the system operating pressure is near atmospheric levels, and when there is minimal probability of a flame stabilizing on the flame arrestor element for an extended period. Typical applications include small fuel-assist lines, waste gas and small instrumentation lines.

Features

  • Connection: threaded or flanged
  • Housing material: aluminum, carbon steel and stainless steel
  • Size: 1/2" (13 mm) through 8" (200 mm)
  • Special material and protective coatings available

Technical Specs
Data Sheets