Surface Finish
Our standard surface finish on rupture disk (bursting disc) holders and fittings is 20~25Ra on all wetted parts. Polishing or electropolishing is used to meet customer special requirements.
Reverse Buckling and Composite Disk Nomenclature
Reverse buckling and composite disks are offered in type -S or type -ST (e.g. RLS-S, RLS-ST) to permit the use of a smaller sanitary connection.
Manufacturing Range of Reverse Buckling Disks
All reverse bucking disks may be offered with a 0%, 5% or 10% manufacturing range. The range is applied to the minus side of the requested burst pressure.
Example: If a disk is ordered with 75 psig (5.17 barg burst pressure and a 10% manufacturing range, it will be tagged at a burst pressure between 67.5 psig (4.65 barg) and 75 psig (5.17 barg).
Burst Tolerance of Reverse Buckling Disks
Burst tolerance is the maximum variation from the tagged burst pressure.
Disk tagged above 40 psig/2.76 barg……………….. ±5%
Disk tagged at 40 psig/2.76 barg and below………. ±2 psig/0.138 barg
| Sanitary Rupture Disks Specifications |
| Type |
Nominal Size
inch (mm) |
Burst Pressure psig (barg) |
Maximum Operating Pressure (7) |
Cycle Life Resistance to Fatique |
Service |
Holder Type (8) |
| GFR-S (5) |
1.0 (25) – 3 (80) |
11.5 (0.79) – 300 (20.68) |
90% |
GOOD |
GAS/LIQUID (1) |
GR-C |
JRS-S (2)
JRS-ST |
1.0 (25) -4 (100) |
16 (1.10) – 180 (12.40) |
90% |
GOOD |
GAS (3) |
SR-C |
GLRS (5)
RLS-S (2)
RLS-ST |
1.5(40) 1.0 (25) – 4 (100) |
175 (12.0) – 350 (24.13) 65 (4.48) – 275 (18.96) |
90% |
GOOD |
GAS/LIQUID (4) |
GR-C
SR-C
SR-C |
D-ST
DV-ST
DD-ST (6) |
1.0 (25) – 4 (100) |
8 (0.55) – 275 (18.96) |
80% |
GOOD |
GAS/LIQUID |
FF-C |
| AV-ST (6) |
2 (50) – 4 (100) |
4.25 (0.29) – 40 (2.76) |
60% |
FAIR |
GAS/LIQUID |
FF-C |
VKB (6)
P/VKB |
2 (50) – 8(200) |
5.50″ WC – 44″ WC 13.75mbarg – 110mbarg 7 (0.48) – 170 (11.70) |
80% |
FAIR |
GAS/LIQUID |
KB-C PKB-C |
| AVB-ST (6) |
– |
1 (0.07) – 10 (0.69) |
– |
FAIR |
– |
VB-C |
Other sizes available for JRS, RLS and D type disks
Notes:
- For full liquid service contact BS&B
- Standard material for JRS and RLS Type disks is 316 SS contact BS&B for other materials and burst pressures.
- May be used in liquid service with adequate volume of gas/vapor above liquid and below disk.
- For full liquid or gas/vapor service.
- GFR-S and GLR-S disk for use with the GR-C, FM-C or FT-C.
- Two-way acting disk for vacuum relief and overpressure relief.
- Recommended maximum operating pressure as a percentage of burst pressure.
- SR-C, FF-C, KB-C, PKB-C, VB-C and PVB-C disk holders are also available with butt or tank weld end connections.
Type GCR-S Reverse Buckling Disk
The GCR-S is an innovative design using SAFT technology (Structural Apex Forming) offering a wide range of burst pressures for sanitary/aseptic applications in the pharmaceutical, biotechnology and food industries.
Features and Benefits
- One disk design for gas and liquid service
- “Fail-safe” design damage safety ratio < 1.0
- Wide range of pressures
- Ideal for CIP / SIP?service
- Installed with integral sanitary gaskets
- 8 to 16 micro-inch typical disk surface finish
- Suitable for operating pressures up to 90% of marked burst pressure* or 95% of the specified minimum burst pressure (CEN Standard)
- Meets ASME BPE standards
- Designed for non-fragmentation
- 0% standard Manufacturing Design Range – optional -5%, -10%
- Withstands full vacuum at all burst pressures
- Available SAS™ (Sanitary Alert Sensor) or LDS (Leak Detector Sensor) with leak sensing capability
- Integral burst disk sensor option
*At marked burst pressures of 40 psig (2.76barg) and below, the recommended maximum operating pressure is 90% of the marked burst pressure, less 2 psig (0.138barg) tolerance.
GCR-S Disk Specification Min/Max Burst Pressure at 72oF (22o) Psig (Bar)
| Sanitary Fitting |
Burst Pressure |
Overall Height |
OD |
| Nominal Disk Size |
Min |
Max |
| in |
mm |
psi |
bar |
psi |
bar |
in |
mm |
in |
mm |
| 1.5 |
40 |
10 |
0.69 |
300 |
20.7 |
1.62 |
41 |
1.98 |
50.3 |
| 2 |
50 |
10 |
0.69 |
300 |
20.7 |
1.62 |
41 |
2.52 |
64 |
| 3 |
80 |
10 |
0.69 |
175 |
12.1 |
1.81 |
46 |
3.58 |
90.9 |
| 4 |
100 |
10 |
0.69 |
75 |
5.2 |
1.81 |
46 |
4.68 |
118.9 |
Other burst pressures may be available – consult BS&B
Design
The GCR family of reverse buckling disks is designed with a circular score line located at the edge of the domed area. At the marked burst pressure, the disk’s dome reverses and opens by shearing around the circular score line. The GCR series uses SAF™ technology enabling very low burst pressures to be achieved with excellent opening characteristics.
SAF™ Technology: Damage-Safety Ratio < 1
Structural Apex Forming (SAF) technology, the central “dimple,” present in all GCR series rupture disks, combined with the unique energy absorbing hinge design ensures a damaged disk will rupture at or below the marked burst pressure.
Marked Burst Pressure
The ASME Code requires that the marked burst pressure is within the manufacturing design range and is determined such that the sample burst test pressures are within the specified tolerance (+/- 2 psig at or below 40 psig or +/- 5% above 40 psig). BS&B Safety Systems, Inc. and BS&B Safety Systems Ltd. will exceed ASME code requirements by continuing to use the average of the burst test values as the marked burst pressure (for -5% and -10% Manufacturing Design Range) and requiring this average to fall within the manufacturing design range. This is in accordance with previous editions of the code and will maintain consistency in burst pressure marking for the user.
Sensors
The GCR-S™ and GCR-SM™ disks are also available with integral sensors to provide warning of a burst rupture disk, specify types GCR-SS™ and GCR-SMS™.
Optional SAS™ for use between standard sanitary fittings to provide warning of a burst rupture disk. Leaking disk detection is also available; consult BS&B?for details.
Manufacturing Design Range
0% standard MDR (Manufacturing Design Range) – The user’s requested burst pressure will be the marked burst pressure. An optional MDR of -5% and -10% may be selected as operating conditions permit. The MDR is applied only to the minus side of the requested burst pressure.
Flow Performance
The GCR series reverse buckling disk has been specifically developed to produce superior flow performance at all burst pressures in gas or liquid service. The circular score on the disk’s dome, coupled with the non-restrictive hinge on the outlet side of the disk, ensures an excellent pressure relief opening.
Flow resistance factor, KR may be used to determine the relieving capacity of a system according to the ASME and CE codes and standards. Individual KR values have been established for both gas and liquid service for the disk. MNFA (minimum net flow area) for each disk size is provided to assist with ASME sizing calculations. For simple systems, NRA (net relief area) has been provided for sizing according to European and International standards.
KR Values MNFA and NRA
| Disk Size |
1 1/2″ (40mm) |
2″ (50mm) |
3″ (80mm) |
4″ (100mm) |
| KRG |
1.95 |
1.25 |
1.95 |
1.95; |
| KRL |
4.95 |
2.90 |
4.95 |
4.95 |
| *MNFA (in2) |
1.5 |
2.70 |
5.29 |
9.78 |
| **NRA (cm2) |
9.67 |
17.4 |
34.1 |
63.1 |
*Use MNFA in2 when sizing according to ASME Code, para UG-127(a)(2)(a)
**Use NRA cm2 (Net Relief/Area) when sizing according to European standards
The KR values indicated are for gas service. The GCR-S disks have been performance tested for both gas and liquid, contact BS&B Safety Systems, Inc. or BS&B Safety Systems Ltd. for liquid service KR values. CE marking of bursting disks will be offered on completion of validation to the European Code.
Gaskets
The GCR series may be supplied with FDA approved silicone, Viton® (white or black), and EPDM (white or black) gaskets ensuring correct and leak-tight installations in type GR-C™ or FM-C™ disk holders.
| Material |
Min Service Temperature |
Max Service Temperature |
| Silicone |
-67ºF (-55ºC) |
450ºF (232ºC) |
| Viton® |
-40ºF (-40ºC) |
400ºF (204ºC) |
| EPDM |
-67ºF (-55ºC) |
300ºF (149ºC) |
| Tef-Steel® |
-20ºF (-29ºC) |
450ºF (232ºC) |
Materials
The GCR series disks and GR-C outlet fitting are available in 316L stainless steel as standard. Alternative materials are available on request.
Liners
Liners are available in all sizes as optional on the process side of the disk. FEP or PFA are generally used.
| Temperature Range |
| Liners |
ºF |
ºC |
| FEP |
-40 to 400 |
-40 to 204 |
| PFE |
-40 to 500 |
-40 to 260 |
GCR-S Disk Types
GCR-S™ and GCR-SS™ with uniquely designed FDA approved gaskets are installed between a standard inlet ferrule and the GR-C™ outlet ensuring correct direction of disk and leak tight installation.
The GCR-SM™ and GCR-SMS™ have a symmetric gasket configuration on both sides of the disk and fit between standard Tri-Clamp® (or equivalent) fittings.
The GCR-SE™ and GCR-SES™ are installed in an FM-C™ or FT-C™ safety head. The FM-C provides for flush mounting of the disk with the interior wall of the vessel while the FT-C accomplishes the same flush mounting in an “in-line” pipe configuration, both achieving minimal dead leg between the disk and process fluid. Similar flush installation is achieved with GCR-N™ and GCR-NS™ type disks when installed in NA-Connect® holders. An integral burst alert sensor is provided on the outlet side of the disk with disk types GCR-SS, GCR-SMS and GCR-NS. The GCR-SW™ is a welded ferrule assembly with the disk is welded between standard fittings.
Type GLR-S Reverse Buckling Disk
The type GLR-S is available in 1.5″ (40 mm) nominal size for use in 1.5″ GR-C fitting or FM-C/FT-C holders. The type GLR-S disk is available with burst pressures as shown below.
Type FM-C Rupture Disk (Bursting Disc) Holder
The inlet of the FM-C disk holder is welded to the vessel wall, and permits the rupture disk (bursting disc) to be installed flush with the interior wall of the vessel. As the dead leg is eliminated, the space between the process fluid and the disk is minimized. The holder is available in 316L SS; clamp 304 SS and for disk/clamp sizes 1″-3″.
The FT-C Rupture Disk (Bursting Disc) Holder
The FT-C holder may be used to replace a conventional sanitary fitting “Tee” on which GFR-SE disk is installed with the advantage of minimizing the dead space between the process fluid and the rupture disk (bursting disc). The FT-C holder permits the rupture disk (bursting disc) to be located adjacent to the process flow. The self-cleaning and sweeping action of the fluid minimizes possible product accumulation on the surface of the disk. The FT-C holder is available in 316 SS , for 1″ – 3″ disk /clamp sizes.
| Type FM-C |
| Disk Size |
Clamp Size |
C |
D |
| inch |
mm |
A |
B |
inch |
mm |
inch |
mm |
| 1″ |
25 |
1″ |
3 |
2.470 |
62.7 |
3.224 |
81.9 |
| 1.5″ |
40 |
1.5″ |
3 |
2.470 |
62.7 |
3.224 |
81.9 |
| 2″ |
50 |
2″ |
3 |
2.470 |
62.7 |
3.224 |
81.9 |
| 3″ |
80 |
3″ |
4 |
2.470 |
62.7 |
4.256 |
108.1 |
| Type FT-C |
| DISK/CLAMP CONNECTION SIZE |
A |
B |
C |
D |
| inch |
mm |
inch |
mm |
inch |
mm |
inch |
mm |
inch |
mm |
| 1 |
25 |
3.97 |
101 |
3.0 |
76 |
4.0 |
102 |
6.00 |
152 |
| 1.5 |
4.0 |
3.97 |
101 |
3.0 |
76 |
4.0 |
102 |
6.00 |
152 |
For larger and alternative sanitary fitting sizes, consult BS&B
Type JRS-S & JRS-ST Reverse Buckling Disks
The JRS-S and JRS-ST are reverse buckling disks which incorporate a teeth ring attached to the downstream side of the disk. When overpressure occurs, disk rupture is achieved by the disk reversing and opening on the teeth-ring providing full relief opening.
Features and Benefits:
- For low burst pressures.
- Excellent for gas/vapor service*.
- Operating pressures up to 90%+ of rated pressure.
- Designed for non-fragmentation.
- Excellent in pressure cycling or pulsating conditions.
- Withstands full vacuum without vacuum support.
- Damage ratio of 1.5 or less. If damaged when installed, it will burst at or less than 1.5 times its rated pressure.
* May be used in liquid service provided there is an adequate volume of vapor above the liquid and below the disk.
+ At rated burst pressures of 40 psig (2.76 barg) and below, the recommended minimum operating pressure is 90% of the rated burst pressure less 2 psig (0.138 barg) tolerance.
Manufacturing Range
Disks in sizes from 1.5″ (40mm) are available with a 0%, -5% and -10% manufacturing range, and the 1″ (25mm) disk is available with a -2%,-5% and -10% manaufacturing range.
TYPE JRS-S & JRS-ST Disk Specifications
Standard Material 316*
Minimum-Maximum Burst pressure @ 72° F (22° C) |
| SIZE |
MINIMUM |
MAXIMUM |
| inch |
mm |
psig |
barg |
psig |
barg |
| 1 |
25 |
24 |
1.65 |
180 |
12.40 |
| 1.5 |
40 |
22 |
1.52 |
150 |
10.34 |
| 2 |
50 |
20 |
1.38 |
120 |
8.27 |
| 3 |
80 |
18 |
1.24 |
80 |
5.52 |
| 4 |
100 |
16 |
1.10 |
70 |
4.82 |
* Other disk sizes and materials available on request.
FEP/PTFE liners are available on the process side of the disk in sizes from 2″ (50mm) and above. Maximum temperature for FEP/PTFE is 500° F (260° C), maximum temperature for 316 SS is 750° F (399° C).
Type RLS-S & RLS-ST Reverse Buckling Disks
The RLS-S and RLS-ST are reverse buckling disks with a circular score-line around the circumference of the disk on the downstream side. A metal hinge is attached to the disk on the downstream side to prevent fragmentation. When overpressure occurs disk rupture is achieved by reversing and opening along the circumferential score-line providing full relief opening.
Features and Benefits
- Excellent for full liquid or gas/vapor service.
- Operating pressure up to 90% of rated pressure.
- Designed for non-fragmentation
- Excellent in pressure cycling or pulsating conditions
- Withstands full vacuum without vacuum support.
- Damage ratio of 1.5 or less. If damaged when installed, it will burst at or less than 1.5 times its rated pressure.
Manufacturing Range
The disks are available with -5% and -10% manufacturing range; 0% manufacturing range is available for certain rupture pressures and sizes.
Note: Refer to SR-C holder details on the sanitary SR-C holder specifications page below when RLS-S and RLS-ST are to be selected
TYPE RLS-S & RLS-ST Disk Specifications
Standard Material 316*
Minimum-Maximum Burst Pressure @ 72° F (22° C) |
| SIZE |
MINIMUM |
MAXIMUM |
| inch |
mm |
psig |
barg |
psig |
barg |
| 1 |
25 |
175 |
12.00 |
275 |
18.96 |
| 1.5 |
40 |
145 |
10.00 |
225 |
15.51 |
| 2 |
50 |
115 |
7.93 |
175 |
12.06 |
| 3 |
80 |
75 |
5.17 |
125 |
8.61 |
| 4 |
100 |
65 |
4.48 |
100 |
6.89 |
Other disks sizes and materials available on request.
FEP/PTFE liners are available on the process or downstream side of the disk in all sizes. Maximum temperature for 316 SS is 750o F (399o C), maximum temperature for FEP/PTFE is 500o F(260o C).
Type GLR-S Reverse Buckling Disk
This is a type RLS reverse buckling disk supplied with an integral sanitary gasket of FDA approved silicone, Viton or EPDM. The unique design of the gasket ensures correct and leak-tight installation with the GR-C fitting or FM-C/FT-C disk holders. The type GLR-S disk is available for burst pressure applications above 300 psig (20.68 barg) which cannot be met by the type GFR-S disk. It is available in 1 1/2″ (40mm) size. It is available with an FEP/PTFE liner which covers the disk and gasket on the process side.
| Type GLR-S Disk Specifications |
| SIZE |
RELIEF AREA |
MINIMUM |
MAXIMUM |
| inch |
mm |
in2 |
mm2 |
psig |
barg |
psig |
barg |
| 1.5 |
40 |
0.79 |
510 |
175 |
12.0 |
350 |
24.13 |
Sanitary SR-C Holder Specifications
| Sanitary SRC Holder Dimensions for Types JR-S/JRS-ST, RLS-S/RLS-ST
Reverse Buckling Disks
|
| DISK/HOLDER SIZE |
CLAMP CONNECTION SIZE/TUBE O.D. (inch) |
DISK TYPE |
HEIGHT *A |
| inch |
mm |
@ Inlet |
@ Disk |
@ Outlet |
inch |
mm |
|
1.0
|
25
|
1.5
2.0
|
2.0
2.0
|
1.5
2.0
|
-S
-S
|
3.25
3.0
|
83
76
|
|
1.5
|
40
|
2.0
2.0
|
2.0
2.5
|
2.0
2.0
|
-ST
-S
|
3.0
3.0
|
76
76
|
|
2.0
|
50
|
2.0
3.0
3.0
|
3.0
3.0
4.0
|
2.0
3.0
3.0
|
-ST
-ST
-S
|
4.19
3.69
4.0
|
106
94
102
|
|
3.0
|
80
|
3.0
4.0
|
4.0
4.0
|
3.0
4.0
|
-ST
-ST
|
4.0
4.0
|
102
102
|
|
4.0
|
100
|
4.0
6.0
|
6.0
6.0
|
4.0
6.0
|
-S
-S
|
5.5
5.5
|
140
140
|
*JRS-ST not available in 1.5″ size for 2″ clamp size. Consult BS&B for alternative inlet/outlet clamp size options and for sizes above 4″ (100mm). Standard SR-C holder material is 316 SS with 304 SS clamp.
Type D-ST & DV-ST Composite Rupture Disks
The D-ST composite rupture disk (bursting disc) consists of a domed slotted metal top section and a plastic or metal seal located on the concave or process side of the top section.
Features and Benefits
- Excellent for liquid or gas/vapor service
- Operating pressures up to 80% of rated pressure.
- FEP/PTFE liner provides a seal and corrosion resistance.
Type DV-ST* Disk
When vacuum is present, the disk is fitted with a vacuum support and a DV-ST type disk must be specified.
Type DD-ST* Disk
The type DD-ST may be used where two-way relief is required. This disk consists of two slotted metal sections with a plastic seal that floats between both sections. The burst pressure in one direction may be up to twice the burst pressure in the opposite direction with full relief opening in both directions when bursting occurs. The available burst pressures are the same as those of the equivalent size D-ST disk, and has identical performance features.
* The DV-ST and DD-ST construction may not be suitable for all sanitary applications, consult BS&B.
Types D-ST and DV-ST Disk Specifications
Standard Material 316 SS FEP/PTFE Seal
Minimum-Maximum Burst Pressure @ 72° F (22° C) |
| SIZE |
MINIMUM |
MAXIMUM |
| inch |
mm |
psig |
barg |
psig |
barg |
| 1 |
25 |
44 |
3.03 |
275 |
18.96 |
| 1.5 |
40 |
31 |
2.14 |
225 |
15.51 |
| 2 |
50 |
15 |
1.03 |
175 |
12.06 |
| 3 |
80 |
11 |
0.76 |
125 |
8.61 |
| 4 |
100 |
8 |
0.55 |
100 |
6.89 |
Other sizes and materials available upon request. Temperature range minimum -40o F (40o C), maximum 500o F (260o C) with FEP/PTFE seal.
Manufacturing Range and Burst Tolerance
Example: If a disk is requested with 17 psig (1.17 barg) burst pressure, the disk will be tagged at a burst pressure between 15 psig (1.03 barg) and 21 psig (1.45 barg).
| Marked Rupture Pressure |
Rupture Tolerance |
| 2 psig (0.14 barg)- less than 15 psig (1.03 barg) |
+/- 1.5 psig (0.1 barg) |
| 15 psig (1.03 barg)-less than 40 psig (2.76 barg) |
+/- psig (0.14 barg) |
| 40 psig (2.76 barg) and above |
+/- 5% |
| Manufacturing Range |
| Specified Pressure Rating |
Test specimens must rupture within limits shown below of the specified pressure |
| psig |
barg |
plus |
minus |
| psig |
barg |
psig |
barg |
| 2.5-3.5 |
0.17-0.24 |
1 |
0.07 |
1 |
0.07 |
| 4-6 |
0.27-0.42 |
2 |
0.14 |
1 |
0.07 |
| 7-10 |
0.48-0.69 |
2.5 |
0.17 |
1.5 |
0.10 |
| 11-16 |
0.76-1.1 |
3 |
0.21 |
2 |
0.14 |
| 17-25 |
1.17-1.72 |
4 |
0.28 |
2 |
0.14 |
| 26-40 |
1.79-2.76 |
5 |
0.35 |
3 |
0.21 |
| 41-65 |
2.82-4.48 |
6 |
0.42 |
4 |
0.28 |
| 66-100 |
4.55-6.89 |
9 |
0.62 |
5 |
0.35 |
| 101-150 |
6.96-10.34 |
12 |
0.83 |
6 |
0.41 |
| 151-200 |
10.41-13.79 |
16 |
1.10 |
9 |
0.62 |
| 201-350 |
13.86-24.13 |
23 |
1.59 |
12 |
0.83 |
Reduced manufacturing ranges of zero, 1/4 and 1/2 are available upon request.
Type AV-ST Composite Rupture Disk (Bursting Disc)
The AV-ST is a flat composite disk designed to relieve overpressure in both directions at the same burst pressure. The disk may be used in either gas or liquid service.
Features and Benefits
- For low burst pressures.
- Operating pressures up to 60% of the minimum burst pressure.
- FEP/PTFE seal.
Burst Pressure Range
All AV-ST* type disks are marked on the disk tag with a minimum/maximum burst range. In the case of a requested burst pressure up to 25 psig (1.72 barg) the burst range will be ± 1.25 psig (0.09 barg) of the requested burst pressure, and above 25 psig (1.72 barg) ± 3 psig (0.21 barg). The manufacturing range and burst tolerance are included in this minimum/maximum burst range.
Example: Type AV-ST burst range minimum 6 psig (0.41 barg)-maximum 8.5 psig (0.59 barg) at 72o F (22o C), 3 inch (80mm).
AV- ST Composite Disk
Standard Material 316 SS FEP/ PTFE SEAL Minimum – Maximum Burst Pressure @ 72° F ( 22°C) |
| SIZE |
MINIMUM |
MAXIMUM |
| inch |
mm |
psig |
barg |
psig |
barg |
| 2 |
50 |
6.25 |
0.43 |
40 |
2.76 |
| 3 |
80 |
5.25 |
0.36 |
35 |
2.41 |
| 4 |
100 |
4.25 |
0.29 |
30 |
2.10 |
Temperature range minimum -40o F (-40o C) to maximum 500o F (260o C), with FEP/PTFE seal. Other sizes and materials available on request. * The construction of the disk may not be suitable for all sanitary applications. Consult BS&B.
| Sanitary FF – C Holder Dimensions For Types DV-ST , D-ST , DD -ST and AV-ST Composite Disks |
| DISK/HOLDER SIZE |
CLAMP CONNECTION SIZE/TUBE O.D. (inch) |
HEIGHT |
| inch |
mm |
@Inlet |
@Disk |
@Outlet |
inch |
mm |
| 1.0 |
25 |
1.5 |
1.5 |
1.5 |
3.0 |
76 |
| 1.5 |
40 |
2.0 |
2.0 |
2.0 |
3.0 |
76 |
| 2.0 |
50 |
3.0 |
3.0 |
3.0 |
3.0 |
76 |
| 3.0 |
80 |
4.0 |
4.0 |
4.0 |
4.0 |
102 |
| 4.0 |
100 |
6.0 |
6.0 |
6.0 |
5.5 |
140 |
Consult BS&B for alternative inlet and outlet clamp size options. Type AV-ST available in sizes 2″ (50mm) and above sizes only.
Standard holder material is 316 SS with 304 SS clamp.
Type VKB & P/VKB Two-Way Relief Disk
The VKB rupture disk (bursting disc) is a two-way acting disk designed to prevent implosion under vacuum or overpressure. The disk may be used in either gas or liquid service. The VKB rupture disk (bursting disc) installed in the KB-C holder meets the requirements of the American 3A sanitary standards.
Vacuum Relief
At the rated vacuum relief pressure the disk seal separates from the perforated metal section to snap against a set of knifeblades located in the disk holder inlet cutting the seal into three segments. The perforated metal section remains intact, and flow through the holes in the metal section relieves the vacuum.
Burst Range
The disks are available with a burst range of +/-1.5 in WC (3.75 mbarg) for pressure up to 8.0 in WC (20 mbarg) and +/- 20% for higher pressures. All tolerances are included in the burst range. Example: a disk with a specified vacuum relief pressure of 7.0 in WC (17.5 mbarg) will be marked on the disk tag as minimum 5.5 in WC (13.75 mbarg) – maximum 8.5 in WC (21.25 mbarg).
Overpressure Relief
The disk relieves overpressure by opening fully along the metal slits in the perforated section. The disk offers a smooth surface towards the process which prevents product accumulation.
Pressure Range for Vacuum and Overpressure Relief for Disk Type VKB
at 72° F (22° C) |
| DISK SIZE |
VACUUM RELIEF |
VACUUM RELIEF AREA |
OVERPRESSURE RELIEF* |
| Minimum |
Maximum |
Minimum |
Maximum |
| inch |
mm |
in WC |
mbarg |
in WC |
mbarg |
in2 |
mm2 |
psig |
barg |
psig |
barg |
| 2.0 |
50
|
7.5 |
18.75 |
44.0 |
110.0 |
1.5 |
967
|
18 |
1.24 |
170 |
11.7 |
| 3.0 |
80
|
6.5 |
16.25 |
30.0 |
75.0 |
3.57
|
2303
|
16 |
1.10 |
170 |
11.7 |
| 4.0 |
100
|
5.5 |
13.75 |
30.0 |
75.0 |
5.93
|
3825
|
13 |
0.9 |
119 |
8.2 |
| 6.0 |
150
|
5.5 |
13.75 |
30.0 |
75.0 |
12.30
|
7935
|
13 |
0.9 |
90 |
6.2 |
| 8.0 |
200
|
5.5 |
13.75 |
20.0 |
50.0 |
18.50
|
11936
|
7 |
0.48 |
55 |
3.8 |
* In overpressure relief the disk opens fully.
Above burst pressures are at 72o F (22o C). Consult BS&B for other burst pressures.
Temperature range minimum -40o F (-40o C) to maximum 250o F (120o C) in overpressure conditions, maximum 175o F (80o C) in vacuum operating conditions. Standard materials are 316 SS with FEP/PTFE seal. Other materials available upon request.
Manufacturing Range
The disks are available with a +/- 2 psig (0.138 barg) or minus 10% manufacturing range depending on the burst pressure.
| Tagged Burst Pressure |
Manufacturing Range |
| Up to 40 psig (2.76 barg) |
+/- 2 psig (0.138 barg) |
| above 40 psig (2.76 barg) |
-10 % |
Example: A burst pressure of 58 psig (4 barg) is requested with a 10% manufacturing range. The values of the burst tests carried out during manufacture will lie between the 52.2 psig (3.6 barg) and 58 psig (4 barg). The average of the test values will be marked on the disk tag.
Burst Tolerance
Tolerances are the maximum variation from the burst pressure shown on the disk tag.
| Tagged Burst Pressure |
Burst Tolerance |
| psig |
(barg) |
| 6 – 8 |
(0.41 – 0.55) |
± 20% |
| 9 – 12 |
(0.62 – 0.83) |
± 15% |
| 13 – 17 |
(0.90 – 1.17) |
± 10% |
| 18 – 25 |
(1.24 – 1.72) |
± 7% |
| 26+ |
(1.79 and above) |
± 5% |
Operating Pressure
The rupture disks (bursting discs) may be subjected to the following operating pressures without affecting the disk’s service life.
Vacuum Relief: up to 80% of the minimum of burst range.
Overpressure Relief: up to 80% of the tagged burst pressure.
Type P/VKB Rupture Disk (Bursting Disc)
Type P/VKB rupture disk (bursting disc) is a two-way acting disk designed to relieve light overpressure or prevent implosion under vacuum. The disk may be used in either gas or liquid service. The type P/VKB is the inverted style of the type VKB disk.
Overpressure Relief
At the rated burst pressure the disk seal separates from the perforated metal section to snap against the knife-blades located in the disk holder oulet, cutting the seal into three segments. The perforated metal section remains intact and flow through the holes in the metal section relieves the overpressure.
Pressure Range for Light Overpressure and
Vacuum Relief for Disk Type P/VKB at 72° F (22°) C |
| OVER PRESSURE RELIEF |
| DISK SIZE |
VACUUM RELIEF |
RELIEF AREA |
| inch |
mm |
MINIMUM |
MAXIMUM |
in2 |
mm2 |
| in WC |
mbarg |
in WC |
mbarg |
| 2.0 |
50 |
7.5 |
18.75 |
44.0 |
110.0 |
1.5 |
967 |
| 3.0 |
80 |
6.5 |
16.25 |
30.0 |
75.0 |
3.57 |
2303 |
| 4.0 |
100 |
5.5 |
13.75 |
30.0 |
75.0 |
5.93 |
3925 |
| 6.0 |
150 |
5.5 |
13.75 |
30.0 |
75.0 |
12.30 |
7935 |
| 8.0 |
200 |
5.5 |
13.75 |
20.0 |
50.0 |
18.50 |
11936 |
Above burst pressures are at 72o F(22o C), consult BS&B for other burst temperatures. Standard materials are 316 SS with a FEP/PTFE seal. Other material available upon request. Temperature range -40o F (-40o C) to maximum of 175o F(80o C).
Burst Range
The disks are available with a burst range of +/- 1.5 in WC (3.75 mbarg) for pressure up to 8.0 in WC (20 mbarg) and +/- 20% for higher pressures. All tolerances are included in the burst range. A disk with a specified burst pressure of 16.0 in WC (40 mbarg) will be shown on the disk tag as minimum 12.8 in WC (32 mbarg) – maximum 19.2 in WC (48 mbarg).
Operating Pressure
The system may operate up to 80% of the minimum of the burst range without affecting the service life of the disk.
Vacuum Relief
The disk may be used also to relieve vacuum depending on specific requirements.
KB-C and PKB-C Holders
Asymmetric alignment pins in the holder mate with locating holes in the rupture disk (bursting disc) for proper installation. The standard holder material is 300 series stainless steel, the knife blade material 301 SS.
|
Sanitary KB-C/PKB-C Holder Dimensions For Types VKB, P/VKB Vac-Saf Rupture Disks
|
| DISK/HOLDER SIZE |
CLAMP CONNECTION SIZE/TUBE O.D. (inch) |
HEIGHT A |
| inch |
mm |
@ Inlet |
@ Disk |
@ Outlet |
inch |
mm |
| 2 |
50 |
3 |
3 |
3 |
3 |
76 |
| 3 |
80 |
4 |
4 |
4 |
3 |
76 |
| 4 |
100 |
6 |
6 |
6 |
4 |
102 |
| 6 |
150 |
8 |
8 |
8 |
4 |
102 |
| 8 |
200 |
10 |
10 |
10 |
4.5 |
114.3 |
Consult BS&B for alternative clamp size options.
Type AVB-ST & P/AVB-ST Two-Way Relief Disks
The type AVB-ST rupture disk (bursting disc), like the VKB disk is a two-way acting disk designed to prevent implosion under vacuum or overpressure. This disk meets the medium range vacuum and overpressure relief requirements that cannot be met by the VKB disk.
Vacuum Relief
Burst Range
T’he disks are available with a minimum/maximum burst range which includes the manufacturing range and burst tolerance. A 4″ (100mm) disk with a specified vacuum relief pressure of 5 psig (0.34 barg) will be marked on the disk tag as minimum 4.5 psig (0.31 barg) to maximum 5.5 psig (0.38 barg).
Overpressure Relief
Manufacturing Range
The disks are available with a 0%, -5% or -10% manufacturing range. If a disk is ordered with a 50 psig (3.45 barg) burst pressure and -10% manufacturing range, it will be tagged at a burst pressure between 45 psig (3.1 barg) and 50 psig (3.45 barg).
|
Pressure Range for Vacuum and Overpressure Relief for Disk Type AVB-ST at 72° F (22° C)
|
| DISK SIZE |
VACUUM RELIEF (psig/barg) |
OVERPRESSURE RELIEF (psig/barg) |
| in |
mm |
MINIMUM |
MAXIMUM |
BURST RANGE |
RELIEF AREA |
MINIMUM |
MAXIMUM |
RELIEF AREA |
| psig |
barg |
psig |
barg |
psig |
barg |
in2 |
cm2 |
psig |
barg |
psig |
barg |
|
2
|
50
|
5
|
0.345
|
10
|
0.689
|
±.5
|
±.0345
|
1.98
|
12.8
|
8
|
0.552
|
100
|
6.89
|
Full
|
|
3
|
80
|
3
|
0.206
|
10
|
0.689
|
±.5
|
±.0345
|
2.03
|
13.1
|
5
|
0.345
|
100
|
6.89
|
Full
|
|
4
|
100
|
2
|
0.138
|
10
|
0.689
|
±.5
|
±.0345
|
3.58
|
23.1
|
5
|
0.345
|
100
|
6.89
|
Full
|
|
6
|
150
|
1.5
|
0.103
|
6
|
0.413
|
±.25
|
±.0172
|
5.93
|
38.25
|
3
|
0.207
|
85
|
5.86
|
Full
|
|
8
|
200
|
1
|
0.069
|
6
|
0.413
|
±.25
|
±.0172
|
9.25
|
59.68
|
3
|
0.207
|
65
|
4.48
|
Full
|
Standard material is 316 SS with a PTFE seal and Kapton vacuum control ring. Other materials available on request.
Temperature range minimum -40° F (40° C), maximum 400° F (204° C).
Burst Tolerance
Tolerances are the maximum variation from the rated burst pressure shown on the tag.
| Tagged Burst Pressure Rating |
| PSIG |
BARG |
BURST TOLERANCE% |
|
3-5
|
0.21-0.35
|
± 25
|
|
6-8
|
0.41-0.55
|
± 20
|
|
9-12
|
0.62-0.83
|
± 15
|
|
13-17
|
0.9-1.17
|
± 10
|
|
18-25
|
1.24-1.72
|
± 7
|
|
26-up
|
1.8 – up
|
± 5
|
Operating Pressures
The rupture disks (bursting discs) may be subjected to the following operating pressures without affecting the disk’s service life.
Overpressure Relief: up to 70% of the disk’s tagged burst pressure.
Vacuum Relief: up to 60% of the minimum of the burst range.
Type P/AVB-ST Disk
The P/AVB-ST disk is the inverted form of the type AVB-ST disk, and meets the medium range of overpressure and vacuum relief requirements that cannot be met by the P/VKB disk.
Overpressure Relief
Burst Range
The disks are available with a minimum – maximum burst range which includes the manufacturing range and burst tolerance. A 3″ (80mm) disk with a specified burst pressure of 7 psig (0.48 barg) will be marked on the disk tag as minimum 6.5 psig (0.45 barg) maximum – 7.5 psig (0.52 barg).
Operating Pressure
The system may operate up to 60% of the minimum of the burst range without affecting the service life of the disk.
Vacuum Relief
The disk may be used also to relieve vacuum depending on specific requirements.
|
Pressure Range for Light Overpressure Relief for Disk type P/AVB-ST
at 72° F (22° C)
|
|
DISK SIZE
|
MINIMUM
|
MAXIMUM
|
BURST RANGE
|
RELIEF AREA
|
|
inch
|
mm
|
psig
|
barg
|
psig
|
barg
|
psig
|
barg
|
in2
|
cm2
|
|
2
|
50
|
5
|
0.345
|
10
|
0.689
|
±.5
|
±.0345
|
1.98
|
12.8
|
|
3
|
80
|
3
|
0.206
|
10
|
0.689
|
±.5
|
±.0345
|
2.03
|
13.1
|
|
4
|
100
|
2
|
0.138
|
10
|
0.689
|
±.5
|
±.0345
|
3.58
|
23.1
|
|
6
|
150
|
1.5
|
0.103
|
6
|
0.413
|
±.25
|
±.0172
|
5.93
|
38.25
|
|
8
|
200
|
1
|
0.069
|
6
|
0.413
|
±.25
|
±.0172
|
9.25
|
59.68
|
Temperature range minimum -40o F (-40o C), maximum 400o F(204o C).
VB-C and P/VB-C Holders
Assymetric alignment pins in the holder mate with locating holes in the rupture disk (bursting disc) for proper installation. The standard holder material is 316 SS.
| Sanitary VB-C and P/VB-C Holder Dimensions for Type AVB-ST and P/AVB-ST Rupture Disks |
| DISK/HOLDER SIZE |
CLAMP CONNECTION SIZE/TUBE O.D. (inch) |
HEIGHT |
| inch |
mm |
@ Inlet |
@ Disk |
@ Outlet |
inch |
mm |
|
2
|
50
|
3
|
3
|
3
|
4.0
|
102
|
|
3
|
80
|
4
|
4
|
4
|
4.0
|
102
|
|
4
|
100
|
6
|
6
|
6
|
5.5
|
140
|
|
6
|
150
|
8
|
8
|
8
|
*
|
*
|
|
8
|
200
|
10
|
10
|
10
|
*
|
*
|
Consult BS&B for alternative clamp size options and height dimensions.
VSP & VSE Explosion Vents
Explosion vents protect against damage in the event of deflagrations of combustible materials. These explosion vents of single section steel construction are supplied with a smooth internal surface finish. Solid white silicone gaskets are fixed to the vent flange area and FDA approved RTV sealing material applied to the vent perimeter to achieve a sanitary/aseptic construction.
The vents are available in a wide range of sizes in either circular or rectangular designs. For more information, see catalog 77-8015.
Typical equipment protected includes silos, spray dryers, dust collectors conveyors.
SAS Sanitary Alert Sensor
The SAS Sanitary Alert Sensor provides immediate warning of a ruptured disk when used with a BS&B Burst Disk Monitor (Catalog 77-1009) or other suitable electrical equipment. The sensor is supplied with gaskets for installation between sanitary fittings on the downstream side of the rupture disk (bursting disc). Gasket materials available are Viton (white or black), EPDM (white or black) and silicone. Leaking disk detection is also available, contact BS&B for details.
The sensor is classified as a simple apparatus, and is suitable for use in hazardous locations provided it is used with other certified electrical apparatus (i.e. a Zener barrier) and properly installed and maintained. Maximum voltage 24Vdc. Maximum current 500mA.
Sanitary Clamps & Accessories
BS&B rupture disks (bursting discs) are installed between sanitary holder fittings and fixed in position using Tri-Clover clamp model 13 MHHS (or equivalent) with hexagonal torque nut. A two-piece high pressure clamp model 13 MHP will be used with high burst pressure disks. Spool, tank or butt weld ferrule accessories are available.
