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Products > Graphite > Universal Arma-Gard™ (AGS)
 
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Previously known as AG3, G3, G3X, G4, G5

Universal Arma-Gard™ is a uniquely engineered graphite rupture disc device. Its patented design overcomes problems associated with damage of conventional graphite rupture discs, caused by poor storage, handling and installation practice; as it is not adversely affected by misaligned, poorly supported pipework, over or uneven torquing of pipe flange bolts.

This is achieved through the use of a steel armored ring, which protects the graphite rupture disc element, while allowing for the correct sealing.
The Universal Arma-Gard™’s monobloc type design equires no holder, enabling direct fitting between flanges.
 

Unlike conventional monobloc designs the Universal Arma-Gard™ eliminates the possibility of side wall bursts. All these added benefits do not detract from excellent corrosion resistance and low-pressure capability normally associated with graphite rupture discs.

  • High levels of corrosion resistance
  • Alleviates problems associated with misaligned and poorly supported pipework
  • Very low pressure capability
  • Non torque-sensitive
  • Back pressure support can be included where required
  • Elimination of side wall burst
Specifications
SIZE RANGE
1" to 20" (25mm to 500mm)
BURST PRESSURE RANGE
1 psig to 1200 psig (0.07 barg to 83 barg)
TEMPERATURE RANGE
-110 to 572F (-80 to 300C)
MAXIMUM OPERATING RATIO
85% of minimum burst pressure(76.5% of nominal burst pressure)
FRAGMENTATION ON BURST
Fragmenting
RELIEF VALVE ISOLATION
No
VACUUM SERVICE
Support not required above 24.6 psig (1.7 barg)
FLUID COMPATIBILITY
Liquid, gas or vapor
KR VALUES
Not available
TORQUE-SENSITIVE
No
CYCLE LIFE
Average
MATERIAL RANGE
Graphite
REVERSAL RATIO
Not applicable
DAMAGE RATIO
<1 (fail-safe)
LEAK TIGHTNESS
Average
PERFORMANCE TOLERANCE
+/- 10% (zero manufacturing design range)
PROTECTIVE LININGS
Available on both faces

Specifications and Performance
BURST PRESSURE RANGE in psig (barg) at 68 °F (20 °C)
Nominal Bore
AGS
AGSX
inches
mm
min
max
min
max
1
25
10 (0.70)
798 (55)
5.1 (0.35)
189 (13.0)
1 ½
40
7.0 (0.48)
595 (41)
3.6 (0.25)
138 (9.5)
2
50
4.1 (0.28)
406 (28)
2.2 (0.15)
87 (6.0)
2 ½
65
3.0 (0.21)
406 (28)
1.5 (0.10)
79.8 (5.5)
3
80
3.0 (0.21)
348 (24)
1.5 (0.10)
65.3 (4.5)
4
100
2.0 (0.14)
247 (17)
0.87 (0.06)
43.5 (3.0)
6
150
1.5 (0.10)
145 (10)
0.73 (0.05)
29 (2.0)
8
200
1.0 (0.07)
79.8 (5.5)
0.44 (0.03)
14.5 (1.0)
10
250
1.0 (0.07)
69.6 (4.8)
0.44 (0.03)
14.5 (1.0)
12
300
1.0 (0.07)
59.5 (4.1)
0.44 (0.03)
14.5 (1.0)
14
350
1.0 (0.07)
4.93 (3.4)
16
400
1.0 (0.07)
4.93 (3.4)
18
450
1.0 (0.07)
40.6 (2.8)
20
500
1.0 (0.07)
30.5 (2.1)

PERFORMANCE TOLERANCE (ZERO MANUFACTURING DESIGN RANGE)
Nominal Bore
+/- 10% Toleranceon Burst pressure
+/- 25% Toleranceon Burst pressure
1 (25mm)
Above 24.7psig (1.7barg)
Up to 24.7psig (1.7barg)
1 ½ (40mm)
Above 14.5psig (1.0barg)
Up to 14.5psig (1.0barg)
2 (50mm)
Above 10.0psig (0.7barg)
Up to 10.0psig (0.7barg)
2 ½ (65mm) and Above
Above 5.0psig (0.34barg)
Up to 5.09psig (0.34barg)

STANDARD TEMPERATURE RANGE °F (°C)
Material
Minimum
Maximum
Resin Impregnated Graphite
-112 (-80)
338 (170)
Exfoliated Graphite AGSX
-112 (-80)
572 (300)
 
FREE FLOW AREA / MINIMUM NET FLOW AREA (MNFA)
Nominal Bore
AGSX
AGS WithoutVacuum Dial
AGS WithVacuum Dial
inches
mm
in2
mm2
in2
mm2
in2
mm2
1
25
0.44
284
0.79
507
0.42
269
1 ½
40
0.99
638
1.77
1140
1.03
665
2
50
1.76
1135
3.14
2027
2.09
1348
2 ½
65
2.75
1774
4.91
3167
3.33
2149
3
80
3.96
2554
7.07
4561
4.53
2925
4
100
7.04
4541
12.57
8108
7.61
4911
6
150
15.84
10217
28.28
18244
16.71
10780
8
200
26.60
17162
50.27
32433
26.81
17295
10
250
43.99
28379
78.55
50677
46.41
29943
12
300
63.34
40866
113.1
72975
66.83
43118
14
350
154.0
99328
81.89
52832
16
400
200.7
129479
117.75
75970
18
450
254.3
164051
166.25
107259
20
500
314.2
202709
170.51
110008

HOLDER DIMENSIONS
Nominal Bore (B)
Height (C)
Outside Diameter (A)
inches
mm
inches
mm
ANSI
BS EN 1092
1
25
0.9
23
150 to 300lb
PN 6 to 25
1 ½
40
0.9
23
150 to 300lb
PN 6 to 25
2
50
0.9
23
150 to 300lb
PN 6 to 25
2 ½
65
0.9
23
150 to 300lb
PN 6 to 25
3
80
0.9
23
150 to 300lb
PN 6 to 25
4
100
1.02
26
150 to 300lb
PN 6 to 25
6
150
1.1
28
150 to 300lb
PN 6 to 25
8
200
1.37
35
150 lb
PN 6 to 10
10
250
1.49
38
150 lb
PN 6 to 10
12
300
1.61
41
150 lb
PN 6 to 10
14
350
2.56
65
150 lb
PN 6 to 10
16
400
2.68
68
150 lb
PN 6 to 10
18
450
2.83
72
150 lb
PN 10
20
500
3.03
77
150 lb
PN 6 to 10

Temperature shields are designed for use in graphite disc applications where gas operating temperatures can reach 600°C. The shield consists of a stainless steel carrier with a ceramic fiber insulating flock and is installed directly upstream of the rupture disc.

To ensure the correct performance of a rupture disc, it must be used in its correct holder, as specified by the rupture disc manufacturer.

Solution Intelligence

 The data shown on these sheets represents the standard offering from Elfab. Depending upon the requirements of your application, Elfab maybe able to provide a solution based on this product but outside the standard operating parameters. In addition, Elfab produces an extensive range of alternative products which maybe more suitable for your requirements.

As a result of extensive testing, Elfab can advise on these choices, or on other technical matters, such as discharge requirements, temperature testing, material selection and corrosion resistance, customized designs and burst detection.

To discuss your specific product or service requirements please contact your Elfab representative.

© 2004 Elfab Ltd.