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Products > Forward > Domed Composite (DC)
 
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(previously known as SC)

Domed composite is a forward acting (tension-loaded) bursting disc, which provides a low pressure, non- fragmenting solution across an extensive size range.

Its unique tri-membrane construction brings enhanced protection, reliability and leak-tightness, and is produced in various slotting arrangements to suite the user’s requirements

  

  • Can be used with Elfab’s unique ATEX approved Integral Flo-Tel™ burst detection
  • Low pressure capability
  • Non torque-sensitive
  • Corrosion resistant
  • Non-fragmenting design

Specifications
Size Range
25mm to 800mm (1" to 32")
Burst Pressure Range
0.3 bar g to 20 bar g (5 psig to 290 psig)
Temperature Range
-80 to 250C (-112 to 482F)
Maximum Operating Ratio
85% of minimum burst pressure(81% of nominal burst pressure)
Fragmentation on Burst
Non-fragmenting design
Relief Valve Isolation
Good
Vacuum Service
Back pressure support required
Fluid Compatibility
Liquid, gas or vapour
KR Values
Not available
Torque-Sensitive
No
Cycle Life
Good
Material Range
Stainless Steel as standard, others available.
Reversal Ratio
<1 (fail safe), depending on back pressure support
Damage Ratio
<1 (fail-safe)
Leak Tightness
Good
Performance Tolerance
+/- 5% (zero manufacturing design range)
Protective Linings
Not available

Pressure and Solutions Intelligence
Depending on back pressure requirements, Elfab bursting discs are fitted with opening or non-opening back pressure supports. Elfab’s unique design of non-opening back pressure supports allows up to 80% free flow area.

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 barg (psig) at 20 °C (68 °F)
Nominal Bore
Nickel Top sectionFluoropolymer Seal
Stainless Steel/Inconel Top SectionFluoropolymer Seal
(mm)
(inch)
Min
Max
Min
Max
25
1
2.0(29)
19 (276)
3.5 (51)
20 (290)
40
1 ½
1.9(28)
19 (276)
3.3 (45)
20 (290)
50
2
1.6(23)
15 (218)
2.1(30)
20 (290)
65
2 ½
1.2(17)
10 (145)
1.6(23)
18 (261)
80
3
0.8(12)
10 (145)
1.4 (20)
18 (261)
100
4
0.75 (11)
10 (145)
1.3 (19)
17 (247)
150
6
0.7 (10)
7.5 (109)
1.3 (19)
13 (189)
200
8
0.6 (8.7)
6.0(87)
1.1 (16)
10 (145)
250
10
0.45 (6.5)
5.0 (73)
0.8 (12)
8.5 (123)
300
12
0.4 (5.8)
4.0(58)
0.7 (10)
5.5 (80)
350
14
0.35 (5.1)
4.0(58)
0.6(8.7)
5.5 (80)
400
16
0.3 (4.4)
3.8(55)
0.55 (8.0)
5.5 (80)
450
18
0.3 (4.4)
3.8(44)
0.55 (8.0)
5.5 (80)
500
20
0.3 (4.4)
3.8(44)
0.55(44)
5.5 (80)
600
24
0.3(4.4)
3.0 (44)
0.5 (7.3)
5.5(80)
700
28
0.3 (4.4)
2.7 (39)
0.5(7.3)
4.7(68)
800
32
0.3(4.4)
2.5 (36)
0.5(7.3)
4.3(62)

Performance Tolerance (Zero Manufacturing Design Range)
Burst Pressure at 20C (68F)
0 to 50C (32 to 122F)
Above 50C (122F) Below 0C (32F)
Above 2barg (29psig)
+/- 5%
+/- 10%
2barg (29psig) or below
+/- 10%
+/- 15%

Standard Temperature Range °C (°F)
Seal Membrane Material
Minimum
Maximum
Fluoropolymer
-80 (-112)
250 (482)

Free Flow Area / Minimum Net Flow Area (MNFA)
Nominal Bore
Value
Burst Pressure
Value
mm
Inch
mm2
in2
mm2
in2
25
1
452
0.70
< 7 barg
340
0.527
40
1 ½
962
1.49
< 5 barg
917
1.42
50
2
1590
2.47
< 4 barg
1480
2.29
65
2 ½
3019
4.68
80
3
4418
6.85
100
4
6362
9.86
150
6
15394
23.86
200
8
28353
43.95
250
10
45239
70.12
300
12
66052
102.4
350
14
90792
140.7
400
16
119459
185.2
450
18
152053
235.7
500
20
188574
292.3
600
24
264208
409.5
700
28
363168
563.0
800
32
477836
740.7

Holder Dimensions
Nominal Bore (B)
Height (C)
Outside Diameter (A)
mm
Inch
mm
Inch
BS EN 1092
ANSI
25
1
38.4
1.51
PN 6 to 50
150 to 600 lb
40
1 ½
38.4
1.51
PN 6 to 50
150 to 600 lb
50
2
38.4
1.51
PN 6 to 50
150 to 600 lb
65
2 ½
40
1.57
PN 6 to 50
150 to 600 lb
80
3
42
1.65
PN 6 to 50
150 to 600 lb
100
4
47
1.85
PN 6 to 50
150 to 600 lb
150
6
62
2.44
PN 6 to 50
150 to 600 lb
200
8
58
2.28
PN 6 to 50
150 to 600 lb
250
10
58
2.28
PN 6 to 50
150 to 600 lb
300
12
58
2.28
PN 6 to 50
150 to 600 lb
350
14
66.5
2.62
PN 6 to 50
150 to 600 lb
400
16
66.5
2.62
PN 6 to 50
150 to 600 lb
450
18
71.5
2.81
PN 6 to 50
150 to 600 lb
500
20
71.5
2.81
PN 6 to 50
150 to 600 lb
600
24
88
3.46
PN 6 to 50
150 to 600 lb
700
28
102
4.02
PN 6 to 50
150 to 600 lb
800
32
116
4.57
PN 6 to 50
150 to 600 lb


The holder is configured to accept Elfab’s ATEX-approved Integral Flo-Tel™ burst detection switch as standard.

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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