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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. For gas group classifications, see the table at the bottom of this page.
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 |
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| 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 |
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| 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) |
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| 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" |
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| 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" |
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| 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 |
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| 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 | |
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