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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 an engineered graphite bursting disc device. Its patented design overcomes problems associated with damage of conventional graphite bursting 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 armoured ring, which protects the graphite bursting element, whilst allowing the clampage necessary for correct sealing.
The Universal Arma-Gard™’s monobloc type design requires 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 bursting 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
25mm to 500mm (1" to 20")
BURST PRESSURE RANGE
0.07 bar g to 83 bar g (1 psig to 1200 psig)
TEMPERATURE RANGE
-80 to 300C (-110 to 572F)
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 1.7 bar g (24.6 psig)
FLUID COMPATIBILITY
liquid, gas or vapour
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

Pressure and Solutions Intelligence
To find out how our products could benefit you and your organisation, or for specifications outside those stated on this data sheet please contact Elfab directly or via your local representative.

Specifications and Performance

BURST PRESSURE RANGE in barg (psig) at 20 °C (68 °F)
Nominal Bore
AGS
AGSX
(mm)
(inch)
Min
Max
Min
Max
25
1
0.70 (10)
55 (798)
0.35 (5.1)
13.0 (189)
40
1 ½
0.48 (7.0)
41 (595)
0.25 (3.6)
9.5 (138)
50
2
0.28 (4.1)
28 (406)
0.15 (2.2)
6.0 (87)
65
2 ½
0.21 (3.0)
28 (406)
0.10 (1.5)
5.5 (79.8)
80
3
0.21 (3.0)
24 (348)
0.10 (1.5)
4.5 (65.3)
100
4
0.14 (2.0)
17 (247)
0.06 (0.87)
3.0 (43.5)
150
6
0.10 (1.5)
10 (145)
0.05 (0.73)
2.0 (29)
200
8
0.07 (1.0)
5.5 (79.8)
0.03 (0.44)
1.0 (14.5)
250
10
0.07(1.0)
4.8 (69.6)
0.03 (0.44)
1.0 (14.5)
300
12
0.07(1.0)
4.1 (59.5)
0.03 (0.44)
1.0 (14.5)
350
14
0.07(1.0)
3.4 (49.3)
400
16
0.07(1.0)
3.4 (49.3)
450
18
0.07(1.0)
2.8 (40.6)
500
20
0.07(1.0)
2.1 (30.5)

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

STANDARD TEMPERATURE RANGE °C (°F)
Material
Minimum
Maximum
Resin Impregnated Graphite
-80 (-112)
170 (338)
Exfoliated Graphite AGSX
-80 (-112)
300 (572)

FREE FLOW AREA / MINIMUM NET FLOW AREA (MNFA)
Nominal Bore
AGSX
AGS Without Vacuum Dial
AGS With Vacuum Dial
mm
inch
mm2
in2
mm2
in2
mm2
in2
25
1
284
0.44
507
0.79
269
0.42
40
1 ½
638
0.99
1140
1.77
665
1.03
50
2
1135
1.76
2027
3.14
1348
2.09
65
2 ½
1774
2.75
3167
4.91
2149
3.33
80
3
2554
3.96
4561
7.07
2925
4.53
100
4
4541
7.04
8108
12.57
4911
7.61
150
6
10217
15.84
18244
28.28
10780
16.71
200
8
17162
26.60
32433
50.27
17295
26.81
250
10
28379
43.99
50677
78.55
29943
46.41
300
12
40866
63.34
72975
113.1
43118
66.83
350
14
99328
154.0
52832
81.89
400
16
129479
200.7
75970
117.75
450
18
164051
254.3
107259
166.25
500
20
202709
314.2
110008
170.51

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


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 fibre insulating flock and is installed directly upstream of the bursting disc.

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

Pressure 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, customised designs and burst detection.

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

© 2004 Elfab Ltd.

 
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