The original rupture disk (bursting disc) manufacturer shaping the growth of pressure relief devices for over 80 years.


Solid Metal Rupture Disk (Bursting Disc)

Select from the following topics:

Benefits
How a Tension-Loaded Disk Works
Standard Manufacturing Ranges
Rupture Tolerance
Specifications
Holder Requirement
Linings
Type BV Disks for Vacuum
Type BR Disks for Low Burst Pressures
Use in Elevated or Cold Temperature Service
Safety Heads for Type B Disks

Benefits

The vents may be supplied with the following:

  • Electrical sensor to warn of open vent
  • Locking enclosure
  • Sealed enclosure for corrosive environments
  • Activated reclosing

How a Tension Loaded Disk Works

As the pressure increases on the tension-loaded disk, the seating design allows the dome to thin out until it can no longer withstand the pressure. The disk ruptures. Metal segments fold back against the walls of the fitting in an irregular pattern to provide a full opening. The ultimate tensile strength of the metal determines its failure point when loaded in tension.

Standard Manufacturing Ranges

When you order a rupture disk (bursting disc), a manufacturing range is automatically assigned to the burst pressure you specify. The following table gives the standard manufacturing ranges. A manufacturing range eliminates the necessity for the manufacturer to stock all possible thicknesses of all materials, nearly 100,000 thicknesses in all, to make all burst pressures.

For example, if you order a B Disk to burst at 80 psig, BS&B will enter the order to the shop with the standard manufacturing range (+9,-5), or 75 to 89 psig. BS&B will try for your requested pressure of 80 psig, but will ship the lot of disks if the marked pressure falls between 75 to 89 psig. Once the disk is rated and marked 78 psig, the burst tolerance of ±5% now applies to this stamped pressure.

The standard manufacturing ranges shown in the following table can be reduced by 1/2 or 1/4 for an additional cost. Hastelloy C-276 / Alloy C-276 is available only with standard manufacturing range and 1/2 range.

Standard Manufacturing Ranges for Solid Metal Disks Before the Disk is Stamped

Desired Pressure Rating Test Specimens must rupture within these limits. (psig)
PSIG
Plus
Minus
2 1/2 -- 3 1/2
1
1
4 -- 6
2
1
7 -- 10
2
1
11 -- 16
3
2
17 -- 25
4
2
26 -- 40
5
3
41 --65
6
4
66 -- 100
9
5
101 -- 150
12
6
151 -- 200
16
9
201 -- 350
23
12
351 -- 500
30
15
501 & up
6%
3%

Rupture Tolerances

Burst tolerances are the maximum expected variation from the disk's marked burst pressure.

Normal Rupture Tolerances for Type B series Solid Metal Disks:

Marked Rupture Pressure (psig) Expected Rupture Tolerance
From >2 to <15 ± 1.5 psig
15 to < 40 ± 2.0 psig
40 and above ± 5 %

Specifications Type B Disk Min/Max Pressure Rating at 72°F (PSIG)

The following BS&B rupture disks (bursting discs) are standard. Those in the most popular materials and bursting pressures are available for quick delivery. Disks with higher or lower bursting pressures than those listed and in other materials are available on special order. Special metals: Platinum, Titanium, Hastelloy C-276. Before specifying any disk, see the above sections on manufacturing ranges and burst tolerance.

Select appropriate disk size to review Min/Max pressures table:

1/2"1"1 1/2" 2"
3"4"6" 8"
10"12"14" 16"
18"20"24" 30-44"

Solid Metal Disks: Types B and BV 1/2"

Disk Material Unlined Disks FEP Lined Disks
Min Pres. Max. Pres. Min Pres. 1/side Min Pres 2/sides Max. Pres. 1/2 Sides Max. Temp. FEP
Aluminum 80 1500 235 380 1500 250 °F
Nickel / Alloy 200 280 20,000 500 600 6000 400 °F
Monel / Alloy 400 340 25,000 500 600 6000 400 °F
Inconel / Alloy 600 440 30,000 790 790 10,000 400 °F
316 SS 625 30,000 820 910 10,000 400 °F

Solid Metal Disks: Types B, BV, BR, BRV, BRSV 1"

Disk Material Unlined Disks FEP Lined Disks
Min. Pres. Max. Pres. Min. Pres. 1/side Min. Pres. 2/sides Max. Pres. 1/2 sides Max. Temp. FEP
Aluminum 40 1000 90 140 1000 250 °F
Nickel / Alloy 200 145 8000 195 245 3000 400 °F
Monel / Alloy 400 175 10,000 225 275 3000 400 °F
Inconel / Alloy 600 I225 12,000 275 325 5000 400 °F
316 SS 320 12,000 370 420 5000 400 °F
Hastelloy C-276
/Alloy C-276
400 12,000 450 500 5000 400 °F

Solid Metal Disks: Types B, BV, BR, BRV, BRSV 1 1/2"

Disk Material Unlined Disks FEP Lined Disks
Min. Pres. Max. Pres. Min. Pres. 1/side Min. Pres. 2/sides Max. Pres. 1/2 sides Max. Temp. FEP
Aluminum 26 750 60 95 700 250 °F
Nickel / Alloy 200 95 6000 130 165 2000 400 °F
Monel / Alloy 400 115 6000 150 185 2000 400 °F
Inconel / Alloy 600 150 6000 185 220 3400 400 °F
316 SS 210 6000 245 280 3400 400 °F
Hastelloy C-276
/Alloy C-276
263 6000 298 333 3400 400 °F

Solid Metal Disks: Types B, BV, BR, BRV, BRSV 2"

Disk Material Unlined Disks FEP Lined Disks
Min. Pres. Max. Pres. Min. Pres. 1/side Min. Pres. 2/sides Max. Pres. 1/2 sides Max. Temp. FEP
Aluminum 16 570 40 64 500 250 °F
Nickel / Alloy 200 55 4000 79 105 1300 400 °F
Monel / Alloy 400 67 4500 91 115 1300 400 °F
Inconel / Alloy 600 87 6000 110 135 1800 400 °F
316 SS 120 6000 145 170 1800 400 °F
Hastelloy C-276
/Alloy C-276
150 6000 175 200 1800 400 °F

Solid Metal Disks: Types B, BV, BR, BRV, BRSV 3"

Disk Material Unlined Disks FEP Lined Disks
Min. Pres. Max. Pres. Min. Pres. 1/side Min. Pres. 2/sides Max. Pres. 1/2 sides Max. Temp. FEP
Aluminum 12 460 26 40 400 250 °F
Nickel / Alloy 200 41 2500 55 69 900 400 °F
Monel / Alloy 400 49 3200 63 77 900 400 °F
Inconel / Alloy 600 63 400 77 91 1500 400 °F
316 SS 90 6000 105 120 1500 400 °F
Hastelloy C-276
/Alloy C-276
113 6000 128 142 1500 400 °F

Solid Metal Disks: Types B, BV, BR, BRV, BRS 4"

Disk Material Unlined Disks FEP Lined Disks
Min. Pres. Max. Pres. Min. Pres. 1/side Min. Pres. 2/sides Max. Pres. 1/2 sides Max. Temp. FEP
Aluminum 9 360 20 31 325 250 °F
Nickel / Alloy 200 31 1900 42 53 650 400 °F
Monel / Alloy 400 37 2400 48 59 650 400 °F
Inconel / Alloy 600 48 3000 59 70 1100 400 °F
316 SS 68 6000 79 90 1100 400 °F
Hastelloy C-276
/Alloy C-276
85 6000 96 107 1100 400 °F

Solid Metal Disks: Types B, BV, BR, BRV, BRSV 6"

Disk Material Unlined Disks FEP Lined Disks
Min. Pres. Max. Pres. Min. Pres. 1/side Min. Pres. 2/sides Max. Pres. 1/2 sides Max. Temp. FEP
Aluminum 7 275 15 23 240 250 °F
Nickel / Alloy 200 23 1400 31 39 500 400 °F
Monel / Alloy 400 28 1800 36 44 500 400 °F
Inconel / Alloy 600 36 2200 44 52 800 400 °F
316 SS 51 3600 59 67 800 400 °F
Hastelloy C-276
/Alloy C-276
64 3600 72 80 800 400 °F

Solid Metal Disks: Types B, BV, BR, BRV, BRSV 8"

Disk Material Unlined Disks FEP Lined Disks
Min. Pres. Max. Pres. Min. Pres. 1/side Min. Pres. 2/sides Max. Pres. 1/2 sides Max. Temp. FEP
Aluminum 5 205 11 17 180 250 °F
Nickel / Alloy 200 18 1100 24 30 375 400 °F
Monel / Alloy 400 22 1450 28 34 375 400 °F
Inconel / Alloy 600 28 1700 34 40 600 400 °F
316 SS 40 2100 46 52 600 400 °F
Hastelloy C-276
/Alloy C-276
50 3600 56 60 600 400 °F

Solid Metal Disks: Types B, BV, BR, BRV, BRSV 10"

Disk Material Unlined Disks FEP Lined Disks
Min. Pres. Max. Pres. Min. Pres. 1/side Min. Pres. 2/sides Max. Pres. 1/2 sides Max. Temp. FEP
Aluminum 4 165 9 14 135 250 °F
Nickel / Alloy 200 14 800 19 24 300 400 °F
Monel / Alloy 400 17 1150 22 27 300 400 °F
Inconel / Alloy 600 22 1400 27 32 500 400 °F
316 SS 30 1400 35 40 500 400 °F

Solid Metal Disks: Types B, BV, BR, BRV, BRSV12"

Disk Material Unlined Disks FEP Lined Disks
Min. Pres. Max. Pres. Min. Pres. 1/side Min. Pres. 2/sides Max. Pres. 1/2 sides Max. Temp. FEP
Aluminum 4 140 8 12 110 250 °F
Nickel / Alloy 200 12 670 16 20 250 250 °F
Monel / Alloy 400 15 960 19 23 250 250 °F
Inconel / Alloy 600 19 1000 23 27 400 400 °F
316 SS 27 1000 31 35 400 400 °F

SOLID METAL DISKS: Types B, BV, BR, BRV, BRSV 14"

Disk Material Unlined Disks
Min. Pres. Max. Pres.
Aluminum 3 125
Nickel / Alloy 200 11 570
Monel / Alloy 400 13 750
Inconel / Alloy 600 17 750
316 SS 23 750

SOLID METAL DISKS: Types B, BV, BR, BRV, BRSV 16"

Disk Material Unlined Disks
Min. Pres. Max. Pres.
Aluminum 3 105
Nickel / Alloy 200 9 410
Monel / Alloy 400 11 500
Inconel / Alloy 600 15 500
316 SS 20 500

SOLID METAL DISKS: Types B, BV, BR, BRV, BRSV 18"

Disk Material Unlined Disks
Min. Pres. Max. Pres.
Aluminum 3 95
Nickel / Alloy 200 8 445
Monel / Alloy 400 10 475
Inconel / Alloy 600 13 475
316 SS 18 475

SOLID METAL DISKS: Types B, BV, BR, BRV, BRSV 20"

Disk Material Unlined Disks
Min. Pres. Max. Pres.
Aluminum 2 85
Nickel / Alloy 200 8 400
Monel / Alloy 400 9 450
Inconel / Alloy 600 12 450
316 SS 16 450

SOLID METAL DISKS: Types B, BV, BR, BRV, BRSV 24"

Disk Material Unlined Disks
Min. Pres. Max. Pres.
Aluminum 2 71
Nickel / Alloy 200 37 145
316 SS 60 230

30"- 40" Consult BS&B for Ratings and Availability

Holder Requirement

The Type B Rupture Disk (Bursting Disc) must be used in BS&B rupture disk (bursting disc) holder types FA, SA, SF, or UA or other types recommended by and manufactured by BS&B. Substitution of either rupture disk (bursting disc) or rupture disk (bursting disc) holder not manufactured by BS&B not only may affect the burst pressure or opening characteristics of the disk, it also voids BS&B warranty.

Linings and Coatings

  1. All liners have passed a spark test to assure pinhole-free condition.
  2. Protective ring is required for solid metal disks with fluoropolymer lining on both sides in all disk materials except aluminum. Specify Type BR, BRV, or BRSV.

Lining Specifications:

Linings:

Standard materials: FEP plastic (Fluoropolymer)
Maximum Temperature: 400 °F
Special materials: TFE plastic (Fluoropolymer)
Maximum Temperature: 500 °F
(Fluoropolymer generally is used. Other appropriate fluorpolymers may be supplied.)
Coatings:Vinylite, a mild corrosion retardant for disk metal, can be applied to one or both sides of disk.
Maximum temperature: 150 °F (66 °C)

Type BV Disks for Vacuum Applications

If backpressure on convex (atmospheric) side of the disk ever exceeds the pressure applied to the concave (pressure) side of the disk, a vacuum support may be required. Supports are not required for all disks. Consult the table below

Where condition is: Full vacuum2/3 Vacuum 1/3 Vacuum
Absolute pressure is: 0 psia5 psia 10 psia
Back pressure is: 14.7 psi 9.7 psi 4.7 psi

  

Rupture disk material is: and pressure rating of disk is less than:
Aluminum 450 psig360 psig 270 psig
Silver 700 psig560 psig 420 psig
Nickel 1200 psig960 psig 720 psig
Monel 1200 psig960 psig 720 psig
Inconel 1200 psig960 psig 720 psig
316 Stainless Steel 1200 psig960 psig 720 psig

Type BR Disks when Disk Burst Pressure is Near the Minimums

If the pressure rating for a Type B Rupture Disk (Bursting Disc) is at or near the minimum, a thin disk is dictated and a BR protective ring is required.

Consider using a BR protective ring for pressures below those listed in the following table.

All ratings are psig.

Disk Size
(inches)
Disk Metal
Aluminium Nickel Alloy 200 Monel Alloy 400 Inconel Alloy 600 316 SS
1 260 1100 1450 1800 2100
1 1/2 173 733 967 1200 1400
2 104 440 580 720 840
3 73 309 407 506 590
4 57 241 318 395 461
6 43 181 238 296 345
8 33 138 181 225 263
10 25 107 141 175 204
1 22 92 121 150 175
14 19 79 104 129 150
16 17 69 91 113 131
18 15 61 81 100 117
20 13 55 73 90 106
24 10 46 60 75 88

Since seating area of disk should be free of any deformity or penetration by a foreign substance that might adhere to lip of flange holder, a heavier gauge metal BR ring should be mounted to one or bother sides of the disk in the seating area to provide support and protection. When one ring is involved, the assembly is called Type BR Rupture Disk (Bursting Disc). When two rings are used, the assembly is called Type BRR Rupture Disk (Bursting Disc). If a vacuum support is required, the BR ring is used only on atmospheric side of disk. This assembly is called Type BRV Rupture Disk (Bursting Disc).

A support ring may provide adequate structural strength for the rupture disk, eliminating the need for a vacuum support. See table below for when a BR can be used instead of a BRV.

When Support Ring will Withstand Full Vacuum
Minimum burst pressure at which Types B and BR Disks with adequate support ring will withstand full vacuum.

Disk Metal Psig
Aluminum 200
Silver 300
Nickel / Alloy 200 500
Monel / Alloy 400 500
Inconel / Alloy 600 500

BR ring:

Standard metal: 316 Stainless Steel
Special metals: Inconel, Monel, Nickel
Hastelloy B and C, 276 Titanium and Tantalum.
Aluminum ring is standard on Aluminum disks.

In most applications involving vacuum, the term "commercial vacuum" is used. If extremely high vacuum is involved--in the micron range--seating of disk may require a soft gasket ring mounted to the process side of support. The assembly of disk support and soft gasket ring is called Type BSV Rupture Disk. If a BR ring is also attached to atmospheric side of disk, the assembly is called Type BRSV Rupture Disk (Bursting Disc). Vacuum grease may also be applied to the soft ring-seating surface to provide additional tightness when high vacuum is encountered.

Soft gasket ring:
Standard materials: Aluminum, or Fluoropolymer
Special Materials: Silver or Nickel

Elevated or Cold Temperature Service

To determine the burst pressure rating at elevated or cold temperatures, a temperature correction factor must be applied to ratings at 72o .

The temperature conversion table applies only to BS&B Type B series Solid Metal Disks and cannot be used for Type D Composite Disks or reverse buckling disks. Data used to develop the table has been obtained from reliable sources, however BS&B does not warrant the figures nor will BS&B be held liable for any use to which the figures may be put.

Temperature correction factors are shown in "percent from rupture pressure at 72o F." Values are approximate and are based on disk metal at temperatures listed.

When selecting Type B Disks for elevated or cold temperature service, check installed conditions whenever possible to determine actual temperatures. You will be able to specify disks with greater burst accuracy.

Recommended maximum temperatures for metals used in standard Type B Disks

Aluminum 250°F
121°C
Silver 250°F
121°C
Nickel / Alloy 200 750 °F
399 °C
Monel / Alloy 400 900 °F
482 °C
Inconel / Alloy 600 1100 °F
593 °C
316 SS 900 °F
482 °C
Hastelloy C-276/
Alloy C-276
900 °F
482 °C

How to Use Temperature Conversion Table

To determine estimated rupture pressure of a disk at temperature other than 72 °F, multiply rated pressure at 72°F by the temperature correction factor shown for the disks metal.

EXAMPLE
What is rupture pressure at 500 °F of a nickel disk rated 300 psi at 72 °F?

  1. Consult temperature conversion table. Correction factor for nickel disk at 500 °F is 86%.
  2. Multiply disk rating at 72 °F by correction factor: 300 X 0.86 = 258

Rupture pressure of a nickel disk rated 300 psi at 72 °F is 258 psi at 500° F.

Temperature Conversion Table for Type B Rupture Disks Only

TEMPERATURE CORRECTION FACTOR IN % FROM RUPTURE PRESSURE AT 72ºF
DISK TEMP. ºF RUPTURE DISK METALS
ALUMINIUM SILVER NICKEL ALLOY 200 MONEL ALLOY 400 INCONEL/ ALLOY 600 316 SS
-423 170 164 165 155 132 200
-320 152 152 144 140 126 181
-225 140 141 126 129 120 165
-200 136 138 122 126 118 160
-150 129 130 116 123 115 150
-130 127 126 116 121 114 145
-110 122 123 115 120 113 141
-100 120 122 115 119 112 139
-90 120 121 114 118 112 136
-80 120 120 114 117 111 134
-70 119 120 113 116 110 132
-60 119 119 112 115 110 130
-50 119 118 112 114 109 128
-40 118 117 111 113 108 125
-30 117 115 110 112 108 123
-20 116 112 109 111 107 121
-10 115 110 108 110 106 118
0 114 108 107 109 105 116
10 113 107 106 108 105 114
20 111 105 105 106 104 112
30 110 104 104 105 103 110
40 108 103 103 104 102 107
50 106 102 102 103 102 105
60 103 101 101 101 101 103
72 100 100 100 100 100 100
80 100 100 100 99 100 99
90 99 99 99 98 99 98
100 98 99 99 97 99 96
110 97 98 98 96 99 95
120 97 98 98 95 98 94
130 96 97 97 95 98 93
140 95 96 97 94 98 92
150 94 95 96 93 97 91
160 93 94 96 93 97 90
170 92 93 96 92 97 90
180 90 92 95 92 96 89
190 89 91 95 91 96 89
200 88 90 95 91 95 88
210 87 89 94 90 95 88
220 85 87 94 90 95 87
230 84 86 94 89 95 87
240 82 85 94 89 95 86
250 81 84 93 89 95 86
260 - - 93 88 94 86
270 - - 93 88 94 85
280 - - 93 88 94 85
290 - - 93 87 94 84
300 - - 93 87 94 84
300 - - 93 87 94 84
310 - - 92 87 94 84
320 - - 92 86 94 83
330 - - 92 86 94 83
340 - - 92 86 94 83
350 - - 91 85 93 82
360 - - 91 85 93 82
370 - - 91 85 93 82
380 - - 91 85 93 82
390 - - 90 84 93 81
400 - - 90 84 93 81
410 - - 90 84 93 81
420 - - 90 84 93 81
430 - - 89 84 93 81
440 - - 89 83 93 80
450 - - 89 83 93 80
460 - - 88 83 93 80
470 - - 88 83 93 80
480 - - 87 83 93 80
490 - - 87 82 94 80
500 - - 86 82 94 79
520 - - 85 82 94 79
540 - - 84 82 94 79
560 - - 83 81 94 79
580 - - 82 81 94 78
600 - - 81 81 94 78
620 - - 79 80 94 77
640 - - 78 80 94 77
660 - - 77 79 93 77
680 - - 76 79 93 76
700 - - 75 78 93 76
720 - - 73 77 93 76
740 - - 72 77 93 76
760 - - - 76 93 75
780 - - - 76 93 75
800 - - - 75 92 75
820 - - - 75 92 75
840 - - - 75 92 75
860 - - - 74 92 75
880 - - - 74 91 74
900 - - - 73 91 74
920 - - - - 90 -
940 - - - - 89 -
960 - - - - 88 -
980 - - - - 87 -
1000 - - - - 86 -
1020 - - - - 85 -
1040 - - - - 85 -
1060 - - - - 84 -
1080 - - - - 83 -
1100 - - - - 82 -

Safety Heads for Type B Rupture Disks

QUIK-SERT or UNION TYPE

QUIK-SERT Safety Heads reduce downtime, assure proper seating of rupture disk (bursting disc).

BS&B Bolted Type Safety Heads are normally compatible with ANSI (ASA) pipe flanges and the flanged connections used on most pressure vessels. Safety Head flanges feature angular seating design to accommodate Type B Solid Metal Disks.

The BS&B QUIK-SERT is a reduced outside diameter, flat-faced flange assembly (FA-7R) that nests between the studs of two ANSI (ASA) flanges. Flanges and rupture disk (bursting disc) are pre-assembled (-in your shop, not at the factory) to assure proper installation of disk. The complete safety Head can be removed without removing discharge piping.

Union Type Safety Heads are used in applications when space is limited and where quick or frequent change out of rupture disk (bursting disc) may be necessary. Standard sizes are _", 1", 1 _", and 2" I.D. BS&B Union Type Safety Head design features angular seating of rupture disk (bursting disc) and will accept Type B Solid Metal Disks