ENARDO Flame Arrestors
Series 7 Inline Flame Arrestor
Enardo Series 7 Inline Flame Arrestors are designed
to stop the propagation of confined low pressure
deflagrations. The Series 7 is typically used for end-ofline 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.
The Series 7 prevents flame propagation by absorbing
and dissipating heat using spiral wound crimped ribbon
flame cells. These cells allow maximum flow with maximum
protection.
Designed with flanged connections, this arrestor allows
removal of the flame cell element for easy cleaning and
replacement without removing the arrestor body from
the pipe connection. Standard housing construction is
aluminum, carbon steel, and stainless steel. The element is
available in aluminum or stainless steel. Special material and
protective coatings are available on request.
ISO 16852 Certified 2 in. (50 mm) - 12 in. (300 mm) IIA and
IIB3
Factory Mutual Approved 2 in. (50 mm) - 12 in. (300 mm),
IIA (D)
Features and Benefits
Enardo’s large crimp opening provide:
• Maximum flow
• Less pressure Drop
• Easy Cleaning
• Less Clogging
• Less Maintenance
• Single Element Design.
• Fluoropolymer coated hardware provides outstanding
corrosion and chemical resistance.
• Easily accessible and removable flame cell for easy
inspection and service.
• Bi-directional design.
• Standard temperature probe on EN models.
• Available in ANSI, DIN and JIS flanges.
Flame Arrestor Specifications
Model
Sizes Available
Series 7 Inline Flame Arrestor
EN Series 7 ISO 16852 Certified
Factory Mutual Approved
1" (25 mm) through 48" (1220 mm)
2" (50 mm) through 12" (300 mm) - (CS & SS only)
2" (50 mm) through 12" (300 mm)
Materials of Construction
Housing
Cell
Gas Group
Aluminum
Carbon Steel
304 SS
316 SS
Hastelloy
Aluminum
304 SS
316 SS
Hastelloy
IIA (D)
IIB3 (C)
IIC (B)
9932 East 58th Street | Tulsa, OK 74146-6411 USA | +1-918-622-6161 | 1-800-336-2736 U.S./Canada
37
Revision A
ENARDO Flame Arrestors
Series 7 Inline Flame Arrestor
EN Certified Model
EN Model Series 7 Flame Arrestor Dimensions
Model
EN-70402
EN-70602
EN-70603
EN-70803
EN-70804
EN-71204
EN-71206
EN-71606
EN-71608
EN-72008
EN-72010
EN-72410
EN-72412
A
Nominal Conn.
Size In. (mm)
2 (50)
2 (50)
3 (75)
3 (75)
4 (100)
4 (100)
6 (150)
6 (150)
8 (200)
8 (200)
10 (250)
10 (250)
12 (300)
B
Housing
Size In. (mm)
4 (100)
6 (150)
6 (150)
8 (200)
8 (200)
12 (300)
12 (300)
16 (400)
16 (400)
20 (500)
20 (500)
24 (600)
24 (600)
C
Outside
Diameter In. (mm)
7.75 (197)
10.25 (260)
10.25 (260)
12 (305)
12 (305)
16 (406)
16 (406)
20 (508)
20 (508)
24 (610)
24 (610)
29 (737)
29 (737)
D
Overall
Length In. (mm)
15.25 (387)
16 (406)
16 (406)
16 (406)
16 (406)
21 (533)
21 (533)
33 (838)
33 (838)
38 (965)
38 (965)
41 (1041)
41 (1041)
Approx.
Weight
Lb. (Kg)
65 (29.5)
68 (31)
72 (32.5)
95 (43)
101 (46)
168 (76)
181 (82)
278 (126)
298 (135)
386 (175)
443 (201)
622 (282)
672 (305)
Dimensions may vary somewhat from those given above. Allow for a tolerance of ± 1.00" (25 mm). Specific dimensions
available on request.
Key to Enardo EN Model Series 7 Flame Arrestor Model Number
EN
/
7
Housing
Size
04 = 4"
Series 7
Flame Arrestor through
24 = 24"
(Concentric)
Series
Connection
Size
02 = 2"
through
12 = 12"
—
IEC
Gas Group
IIA (D)
IIB3 (C)
E7 If Eccentric
Housing
Material
C.Carbon
Steel
4. 304 S.S.
6. 316 S.S.
H.Hastelloy
Cell
Material
4. 304 S.S.
6. 316 S.S.
H.Hastelloy
Connection
Type
F. Flat Faced
Flange
R.Raised Face
Flange
Example:
EN
7
2
0
1
0
/
IIA
—
2
—
C
4
R
—
Options
1. Drain Plugs
2. Temp. Probe
(Std.)
3.Pressure
Taps
4.Misc.
Fittings
5.Protective
Coatings
6.Special
Features
1
2
Indicates a 10" Concentric Series 7 Inline Flame Arrestor with a 20" carbon steel housing, ANSI 150 lb. raised faced flange
connections and 304 stainless steel IEC Group “IIA” flame cell element. It also has additional options of drain plugs and
standard temperature probe.
ENARDO | www.enardo.com
38
Revision A
ENARDO Flame Arrestors
Series 7 Inline Flame Arrestor
Carbon Steel and
Stainless Steel Housings
*
Standard Model Series 7 Flame Arrestor Dimensions
A
Nominal Conn.
Size In. (mm)
1 (25)
2 (50)
2 (50)
2 (50)
3 (75)
3 (75)
4 (100)
6 (150)
6 (150)
8 (200)
8 (200)
10 (250)
10 (250)
12 (300)
12 (300)
Model
70401
70402
70602
70802
70603
70803
70804
71006
71206
71408
71608
71810
72010
72212
72412
B
Housing
Size In. (mm)
4 (100)
4 (100)
6 (150)
8 (200)
6 (150)
8 (200)
8 (200)
10 (250)
12 (300)
14 (350)
16 (400)
18 (450)
20 (500)
22 (550)
24 (600)
C
Outside
Diameter In. (mm)
7.75 (197)
7.75 (197)
10.25 (260)
12 (305)
10.25 (260)
12 (305)
12 (305)
14 (356)
16 (406)
18 (457)
20 (508)
22 (559)
24 (610)
26 (660)
29 (737)
D
Overall
Length In. (mm)
15.63 (397)
15.25 (387)
16 (406)
16 (406)
16 (406)
16 (406)
16 (406)
21 (533)
21 (533)
25 (635)
33 (838)
30 (762)
38 (965)
34 (863)
41 (1041)
Approximate
Weight Lb. (Kg)
Group D Models
60 (27)
63 (29)
66 (30)
85 (38.6)
70 (31.8)
90 (40.8)
95 (43.1)
135 (61.2)
165 (74.8)
225 (102.1)
270 (122.5)
335 (152.0)
400 (181.4)
477 (216)
590 (268)
14"-36" and over – dimensions available on request. Dimensions may vary somewhat from those given above. Allow for a
tolerance of ± 1.00" (25 mm). Specific dimensions available on request.
*Not all models are available with FM approval. Consult Flame Arrestor Certifications page for more information.
Key to Enardo Standard Model Series 7 Flame Arrestor Model Number
/
7
Housing
Size
04 = 4"
Series 7
Flame Arrestor through
72 = 72"
(Concentric)
Series
Connection
Size
01 = 1"
through
48 = 48"
E7 If Eccentric
—
NEC
Gas Group
B. Group “B”
(IIC)
C. Group “C”
(IIB3)
D.Group “D”
(IIA)
—
Housing
Material
C.Carbon
Steel
4. 304 S.S.
6. 316 S.S.
H.Hastelloy
Cell
Material
A. Aluminum
4. 304 S.S.
6. 316 S.S.
H.Hastelloy
Connection
Type
F. Flat Faced
Flange
R.Raised Face
Flange
Example:
7
2
0
1
0
/
D
—
C
4
R
—
Options
1. Drain Plugs
2. Temp. Probe
Taps
3.Pressure
Taps
4.Misc.
Fittings
5. Protective Coatings
6. Special Features
1
2
Indicates a 10" Concentric Series 7 Inline Flame Arrestor with a 20" carbon steel housing, ANSI 150 lb. raised faced flange
connections and 304 stainless steel NEC Group “D” flame cell element. It also has additional options of drain plugs and
temperature probe taps.
9932 East 58th Street | Tulsa, OK 74146-6411 USA | +1-918-622-6161 | 1-800-336-2736 U.S./Canada
39
Revision A
ENARDO Flame Arrestors
Series 7 Inline Flame Arrestor
Aluminum Housing
Cast Aluminum Model Series 7 Flame Arrestor Dimensions
Model
A
Nominal Conn.
Size In. (mm)
B
Housing
Size In. (mm)
C
Outside
Diameter In. (mm)
D
Overall
Length In. (mm)
70802
70803
70804
71006
71206
71408
71608
72010
72212
72412
2 (50)
3 (75)
4 (100)
6 (150)
6 (150)
8 (200)
8 (200)
10 (250)
12 (300)
12 (300)
8 (200)
8 (200)
8 (200)
10 (250)
12 (300)
14 (350)
16 (400)
20 (500)
22 (550)
24 (600)
11.13 (283)
11.13 (283)
11.13 (283)
13.13 (334)
15.13 (384)
17.13 (435)
19.13 (486)
24.38 (619)
26 (660)
29 (737)
16.50 (419)
16.50 (419)
16.50 (419)
21.50 (546)
21.50 (546)
25.63 (651)
25.50 (648)
30.63 (778)
34 (863)
41 (1041)
Approx. Weight
w/ Aluminum Cell
Lb. (Kg)
Group D Models
24 (10.9)
27 (12.2)
31 (14.1)
46 (20.9)
60 (27.2)
80 (36.3)
95 (43.1)
180 (81.6)
190 (86)
230 (104)
Approx. Weight
w/ S.S. Cell
Lb. (Kg)
Group D Models
33 (15.0)
36 (16.3)
40 (18.1)
73 (33.1)
85 (38.6)
113 (51.3)
138 (62.6)
245 (111.1)
255(116)
315 (143)
Dimensions may vary somewhat from those given above. Allow for a tollerance of ± 1.00" (25 mm). Specific dimensions
available on request.
Key to Enardo Cast Aluminum Model Series 7 Flame Arrestor Model Number
/
7
Housing
Size
08 = 8"
Series 7
Flame Arrestor through
24 = 24"
(Concentric)
Series
Connection
Size
02 = 2"
through
12 = 12"
—
—
Housing
NEC
Material
Gas Group
D.Group “D” A. Aluminum
(IIA)
Cell
Material
A. Aluminum
4. 304 S.S.
6. 316 S.S.
H.Hastelloy
Connection
Type
F. Flat Faced
Flange
R.Raised Face
Flange
E7 If Eccentric
Options
1. Drain Plugs
2. Temp. Probe
Taps
3.Pressure
Taps
4.Misc.
Fittings
5.Protective
Coatings
6.Special
Features
Example:
7
2
0
1
0
/
D
A
—
4
F
—
1
2
Indicates a Concentric Series 7 Inline Flame Arrestor with a 20" aluminum housing, ANSI 10" flat faced flange connections
and 304 stainless steel NEC Group “D” flame cell element. It also has additional options of drain plugs and temperature
probe taps.
ENARDO | www.enardo.com
40
Revision A