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 ¼ 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"1½"	2"
3"4"6"	8"
10"12"14"	16"
18"20"24"	30-44"

Solid Metal Disks: Types B and BV½"

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 1½"

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 (Teflon®*)
Maximum Temperature: 400 °F
Special materials: TFE plastic (Teflon®*)
Maximum Temperature: 500 °F
(Teflon® generally is used. Other appropriate fluorpolymers may be supplied. Teflon® is a registered trademark of Dupont.)
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 Teflon
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 72^o .

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 72^o 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