 |
Assemblies
Custom Rupture Disk (Bursting Disc) |
Many customer applications cannot be met using
standard rupture disk (bursting disc) and safety head designs. That’s why BS&B has
invested in a department committed to the development of customized
rupture disk assemblies.
Examples
of special requests:
- Special disk holder design
- Exotic materials
- Cryogenic or elevated temperature
- Lower
or higher item standard burst pressures
- Hermetic sealing
- Qualification procedures, testing and documentation
BS&B will design the most cost effective solution
for your application. We use state-of-the-art production methods including
precision machining, CAD/CAM, electron beam or laser welding. BS&B has
designed and manufactured customized rupture disk (bursting disc) assemblies to meet
customer requirements in a wide range of industries including aviation,
cryogenic or high temperature systems, fire suppression, plastic
extrusion, aerospace and defense.
|
STA-KUL
Sealed Type Safety Heads
BS&B
STA-KUL Sealed Type Safety Heads are bottle-tight pressure relief devices
designed primarily for air conditioning systems. When disk ruptures,
complete unit is replaced.
The
STA-KUL unit has two important features:
1.
Controlled pressure accuracy
2. No leakage
Each
unit is leak-tested before it leaves the factory.
The
bottle-tight capability of the STA-KUL unit makes it highly desirable for
other applications. It is readily adaptable for use on gas cylinders,
pressure gauges, hydraulic accumulators, and portable compressed air
systems.
BS&B
STA-KUL units are available in two standard types:
Type
22
Brass
body with Type B of BV solid metal rupture disk.
Rupture
disk will withstand 14.7 psi back pressure without vacuum support at any
pressure rating specified within minimum/maximum range. If disk will be
exposed to back pressure higher than 14.7 psi at specified operating
temperature, consult factory. A vacuum support may be required.
1. For
optimum service life normal operating pressure should be at or
below:
| Disk Material |
Operating Pressure |
| Nickel |
70% specified disk rating |
| Silver |
50% specified disk
rating |
2.
Temperature at or below 750F for nickel disk, 250 F for silver disk.
3.
Static pressure load on disk
(non-pulsating).
|
Type 42
Brass
body with Type D or DV composite rupture disk (bursting disc) with a metal top section and
silver or teflon seal.
Vacuum
support required if disk has specified pressure rating below 550 psi @ 72°
F. or will be exposed to elevated temperature and 14.7 psi back
pressure.
Application guidelines
1.
Pressure, temperature or service conditions that exceed limits for Type 22
unit
2. Normal operating pressure should not exceed 80% of disk
rating.
Note: If
the atmospheric condition limit selection of top section metal, specify
acceptable material(s).
Standard
STA-KUL Sealed Type Safety Heads
|
| Disk Material |
Operating Pressure |
| Nickel |
70% specified disk |
| Silver |
50% specified
disk |
Standard STA-KUL Seal Type safety
Heads
* Lower minimum pressure ratings available on
request.
MANUFACTURING RANGES FOR SOLID METAL OR COMPOSITE
DISKS
Rupture Disks
| Type No. |
Material |
Material |
Rupture Pressure PSIG Kg/cm2 at 22o C |
Max. Temp.
o
F
o C |
| |
|
|
Min. |
Max. |
|
22
B or BV |
Brass |
Nickel |
200
14.1 |
1000
70.3 |
750
399 |
| |
|
Silver |
130
9.1 |
1000
70.3 |
250
121 |
42
D or DV |
Brass |
316SS or Inconel with teflon seal |
115
8.1 |
700
49.2 |
500
260 |
| |
|
Nickel with teflon seal |
77
5.4 |
700
49.2 |
500
260 |
| |
|
316SS or Inconel with silver seal |
180
12.7 |
1000
70.3 |
800
427 |
|
| Desired Pressure rating |
Test
specimens must rupture within limits below of the pressure you
specify |
Desired Pressure Rating |
Test specimens must rupture within limits below of the
pressure you specify |
| PSIG |
Plus |
Minus |
Kg/CM2 |
Plus |
Minus |
| 2.5 -3.5 |
1 psig |
1 psig |
.176-.246 |
.070 Kg/CM2 |
.070Kg/CM2 |
| 4 - 6 |
2 psig |
1 psig |
.281-.422 |
.141 Kg/CM2 |
.070Kg/CM2 |
| 7 - 10 |
2.5 psig |
1.5 psig |
.49-.70 |
.176 Kg/CM2 |
.105 Kg/CM2 |
| 11- 16 |
3 psig |
2 psig |
.77-1.13 |
.211 Kg/CM2 |
.141 Kg/CM2 |
| 17 - 25 |
4 psig |
2 psig |
1.20-1.76 |
.281 Kg/CM2 |
.141 Kg/CM2 |
| 26 - 40 |
5 psig |
3 psig |
1.83-2.81 |
.352 Kg/CM2 |
.211 Kg/CM2 |
| 41 - 65 |
6 psig |
4 psig |
2.88-4.57 |
.422 Kg/CM2 |
.281 Kg/CM2 |
| 66 -100 |
9 psig |
5 psig |
4.64-7.03 |
.633 Kg/CM2 |
.352 Kg/CM2 |
| 101-150 |
12 psig |
6 psig |
7.10-10.55 |
.844 Kg/CM2 |
.422 Kg/CM2 |
| 151-200 |
16 psig |
9 psig |
10.62-14.06 |
1.125 Kg/CM2 |
.633 Kg/CM2 |
| 201-350 |
23 psig |
12 psig |
14.14-24.61 |
1.617Kg/CM2 |
.844 Kg/CM2 |
| 351-500 |
30 psig |
15 psig |
24.68-35.16 |
2.11 Kg/CM2 |
1.055Kg/CM2 |
| 501-&up |
6 pct. |
3 pct. |
35.23- &up |
6 pct. |
3
pct. |
|
|
Dimensions for
STA-KUL Sealed Type Safety Heads
| Assembly
Number |
Connections |
Discharge
Area |
Overall
height |
Hex across
flat |
| Inlet |
Outlet |
| AC
1 |
1/4"
MPT |
FREE |
.049 |
1
3/32 |
1
1/8 |
| AC
2 |
1/2"
MPT |
FREE |
.196 |
1
1/4 |
1
1/8 |
| A
3 |
3/8"
MPT |
3/8"
SAE |
.062 |
1
7/8 |
1
1/8 |
| A
4 |
3/8"
MPT |
1/2"
SAE |
.110 |
1
15/16 |
1
1/8 |
| A
5 |
3/8"
MPT |
1/2"
MPT |
.110 |
1
7/8 |
1
1/8 |
| A
6 |
1/2"
MPT |
1/2"
MPT |
.196 |
2
1/16 |
1
1/8 |
| A
7 |
1/4"
MPT |
Muffled |
.049 |
1
9/16 |
1
1/8 |
| A
8 |
1/2"
MPT |
Muffled |
.196 |
1
3/4 |
1
1/8 |
| A
9 |
3/4"
MPT |
Muffled |
.307 |
2
11/64 |
1
1/8 |
Screw Type
Safety Heads
BS&B
Screw Type Safety Heads are widely used on autoclaves, laboratory pressure
equipment, aerospace ground support equipment, bottled gases, cryogenic
systems and compressed air or liquid systems. The standard BS&B Screw
Type Safety Head utilizes a single body with 15,000# maximum rating that
is designed to accept four different holddown rings. Three rings have a
flat seat design, the fourth an angular seat.
One flat
seat ring has a 11/16 " burst diameter and will accept low pressure Types
B, D and DV disks up to 1000 psi maximum pressure. The angular seat ring
has a 1/2 " burst diameter and is used for Type B disks only up to 3000
psi maximum pressure. The second flat seat ring also has 1/2 " diameter
and uses Type B disks from 3000 to 10000 psi maximum. The fourth ring has
a 7/16 " flat seat and is used for disks from 7500 to 15,000
psi.
Standard
rupture disks (bursting discs) for BS&B Screw Type Safety Heads are listed on the
following pages. In addition to the four sizes described above, 3/16" flat
seat rupture disks (bursting discs) and 1/4 " angular seat rupture disks (bursting discs) are also available
in standard disk metals and bursting pressures. These are designed to fit
autoclave equipment. The 7/16" and 1/2 " flat seat rupture disks (bursting discs) will also
fit autoclave equipment.
Standard
material for inlet connection, holddown ring and outlet connection: 303
stainless steel. Other materials available upon request.
Screw
Type Safety Heads with rupture disk (bursting disc) bursting pressures from 15,000 to
100,000 psi are available in a special design. Consult factory.
Pressure/Temperature
Ratings for Screw Type Safety Head Fittings
Service
Temp.
F
C |
Maximum
Rating
PSIG
kg/cm2 |
-20 to
+100
-29 to +38 |
15,000
1,055 |
200
93 |
14,625
1,028 |
300
149 |
14,175
997 |
400
204 |
13,875
976 |
500
260 |
13,050
918 |
600
316 |
11,550
812 |
700
371 |
10,275
722 |
800
427 |
9,300
654 |
900
482 |
8,400
590 |
1000
538 |
7,925
557 |
Dimensions
for Screw Type Safety Heads
MIN-3000
PSI |
MIN-1000
PSI |
3000-10000
PSI |
7500-1500
PSI |
CONNECTIONS |
Inlet
Bore
Size
(Dia.)*
in.
mm |
overall
height
in. mm. |
hex across
flats |
1/2(A)
12.7 |
11/16(F)
17.4 |
1/2(F)
12.7 |
7/16(F)
11.1 |
Inlet
in
mm. |
outlet |
|
|
Inlet
in. mm. |
Outlet
in. mm. |
| SA-7 |
SF-47 |
SF-57 |
SF-67 |
1/4MPT
6.4 |
Free |
1/4
6.4 |
2
1/16
52.4 |
1
1/4
31.8 |
1
1/8
28.6 |
| SA-8 |
SF-48 |
SF-58 |
SF-68 |
1/2MPT
12.7 |
Free |
13/32
10.3 |
2
3/16
55.6 |
1
1/4
31.8 |
1
1/8
28.6 |
| SA-9 |
SF-49 |
SF-59 |
SF-69 |
1/4MPT
6.4 |
1/2MPT
12.7 |
1/4
6.4 |
2
7/8
73.0 |
1
1/4
31.8 |
1
1/8
28.6 |
| SA-10 |
SF-50 |
SF-60 |
SF-70 |
1/2MPT
12.7 |
1/2MPT
12.7 |
13/32
10.3 |
3
76.2 |
1
1/4
31.8 |
1
1/8
28.6 |
| SA-11 |
SF-51 |
SF-61 |
SF-71 |
1/4MPT
6.4 |
Muffled |
1/4
6.4 |
2
3/8
60.3 |
1
1/4
31.8 |
1
1/8
28.6 |
| SA-12 |
SF-52 |
SF-62 |
SF-72 |
1/2MPT
12.7 |
Muffled |
13/32
10.3 |
2
1/2
63.5 |
1
1/4
31.8 |
1
1/8
28.6 |
* 1/2"
inlet bore available on All Assemblies with 1/2" MPT inlet when disk
rating is below 7500 psi @ 72F. |
Rupture Disks for Screw
Type Safety Heads
The
following BS&B rupture disks (bursting discs) for screw type Safety Heads are standard.
Those in the most popular materials and bursting pressures are "shelf
items" and available for immediate delivery. Consult your local
representative for current listing of these disks. Disks with higher or
lower bursting pressures than those listed and in other materials are
available on special order.
Minimum/maximum pressure ratings and maximum temperature ratings
have two sets of figures. Pressure ratings shown in black are psig @ 72F.,
those in red are kg/cm2 @ 22° C. Temperature PSIG shown in black are °F.,
those in red are °C.
Before
specifying any disk, see table of manufacturing ranges and notes at bottom
of page.
1/2"
ANGULAR SEAT SOLID METAL DISKS - 3000 PSI MAX: TYPES B AND BV
| Disk
Material |
Unlined Disks |
FEP Lined Disks |
| Min. pres. |
Max.
pres. |
Max.
temp. |
Min.
pres.
1/sides |
Min.
pres.
2/sides |
Max.
pres.
1/2sides |
Max.
temp.
FEP |
| Aluminum |
80
5.63 |
1500
105.5 |
250
121 |
235
16.5 |
380
26.7 |
1500
105.5 |
250
121 |
| Silver |
175
12.3 |
3000
211.0 |
250
121 |
395
27.8 |
490
34.5 |
200
140.7 |
250
121 |
| Nickel |
280
19.7 |
3000
211.0 |
750
399 |
500
35.2 |
600
42.2 |
3000
211.0 |
400
204 |
| Monel |
340
24.0 |
3000
211.0 |
800
427 |
500
35.2 |
600
42.2 |
3000
211.0 |
400
204 |
| Inconel |
440
31.0 |
3000
211.0 |
900
482 |
700
49.2 |
790
55.6 |
3000
211.0 |
400
204 |
| 316
S.S. |
625
44.0 |
3000
211.0 |
900
482 |
820
57.7 |
910
64.0 |
3000
211.0 |
400
204 |
11/16"
FLAT SEAT SOLID METAL DISKS
1000 PSI MAX: Types B and BV
| Disk Material |
Unilined
Disks |
FEP
Lined Disks |
| Min.
pres |
Max.
pres. |
Max.
Temp. |
Min.
Pres.
1 Side
FEP |
Max.
pres.
1 Side |
Max.
temp.
FEP |
| Aluminum |
55
3.87 |
650
45.7 |
250
121 |
225
15.8 |
650
45.7 |
250
121 |
| Silver |
130
9.1 |
1000
70.3 |
250
121 |
300
21.1 |
1000
70.3 |
250
121 |
| Nickel |
200
14.1 |
1000
70.3 |
750
399 |
370
26.0 |
1000
70.3 |
400
204 |
| Monel |
250
17.6 |
1000
70.3 |
800
427 |
420
29.5 |
1000
70.3 |
400
204 |
| Inconel |
325
22.8 |
1000
70.3 |
900
482 |
500
35.2 |
1000
70.3 |
400
204 |
| 316
S.S |
455
32.0 |
1000
70.3 |
900
482 |
650
45.7 |
1000
70.3 |
400
204 |
11/16" FLAT SEAT COMPOSITE DISKS
1000 PSI MAX: Types D and DV
|
Top Section Material |
| Seal
Material |
Minimum
Pressure |
Max. pres.
All
Matls |
Max.
Temp |
Inconel
316S.S. |
Nickel |
Alum. |
TFE
.003"
thick |
___ |
___ |
40
2.81 |
___ |
250
121 |
TFE(teflon
/Halon) |
115
8.1 |
77
5.41 |
___ |
700
49.2 |
500
260 |
| FEP(Teflon) |
115
8.1 |
___ |
___ |
700
49.2 |
400
204 |
| Aluminum |
150
10.5 |
___ |
___ |
800
56.3 |
800
427 |
| Silver |
180
12.7 |
___ |
___ |
1000
70.3 |
800
427 |
| Nickel |
300
21.1 |
___ |
___ |
1000
70.3 |
1000
538 |
| Monel |
400
28.1 |
___ |
___ |
1000
70.3 |
1000
538 |
| Inconel |
600
42.2 |
___ |
___ |
1000
70.3 |
1000
538 |
| 316
S.S. |
700
49.2 |
___ |
___ |
1000
70.3 |
1000
538 |
Manufacturing Ranges
for Solid Metal of Composite Disks
| Desired
pressure Rating |
Test
specimens must rupture within limits below of the pressure
you
specify |
Desired Pressure
Rating |
Test Specimens must rupture within limits below of the
pressure you specify |
| PSIG |
Plus |
Minus |
Kg/CM2 |
Plus |
Minus |
| 26 -
40 |
5 psig |
3 psig |
1.83 - 2.81 |
.352 Kg/CM2 |
.211 Kg/CM2 |
| 41 -
65 |
6 psig |
4 psig |
2.88 - 4.57 |
.422 Kg/CM2 |
.281 Kg/CM2 |
| 66 -
100 |
9 psig |
5 psig |
4.64 - 7.03 |
.633 Kg/CM2 |
.352 Kg/CM2 |
| 101 -
150 |
12 psig |
6 psig |
7.10 - 10.55 |
.844 Kg/CM2 |
.422 Kg/CM2 |
| 151 -
200 |
16 psig |
9 psig |
10.62- 14.06 |
1.125 Kg/CM2 |
.633 Kg/CM2 |
| 201 -
350 |
23 psig |
12
psig |
14.14- 24.61 |
1.617 Kg/CM2 |
.844 Kg/CM2 |
| 351 -
500 |
30 psig |
15
psig |
24.68- 35.16 |
2.11 Kg/CM2 |
1.055 Kg/CM2 |
| 501 & up |
6 pct. |
3 pct. |
35.23 &Up |
6
pct. |
3
pct. |
NOTES:
1. If
1/2 ", angular seat Type B disk will be exposed to vacuum or back
pressure, check Type B catalog for minimum burst pressures that will
withstand full vacuum. If vacuum support is required, specify Type BV. If
Type D disk will be exposed to vacuum, specify Type DV.
2. If flat seat
Type B disk will be exposed to vacuum or back pressure, vacuum support is
not required if disk rating exceeds the following:
| aluminum |
200
psi |
Monel |
500 psi |
| silver |
200 psi |
lnconel |
750 psi |
| nickel |
375
psi |
316
stainless steel |
750
psi |
If
vacuum support is required, specify Type BV.
3. Vacuum supports for
1/2" angular seat and 11/16" flat seat Type BV disks are not attached.
Standard material for vacuum support is 316 stainless steel. Materials
available on special order include Inconel, Nickel, Monel, Hastelloy B and
C, titanium and tantalum.
4. Linings on Type B disks have very little
creep resistance. Operating margin for lined disks must be greater than
for unlined disks.
5. Linings are sheet form bonded to disk metal. All
liners have passed spark test to assure pinhole-free
condition. |
|
Rupture Disks for
Screw Type Safety Heads
The
following BS&B rupture disks (bursting discs) for autoclave equipment are standard.
Those in the most popular materials and bursting pressures are "shelf
items" and available for immediate delivery. Consult your local
representative for current listing of these disks. Disks with higher and
lower bursting pressures than those listed and in other materials are
available on special order.
Minimum/maximum pressure ratings and
maximum temperature ratings have two sets of figures. Pressure ratings
shown in black are psig @ 72° F., those in red are kg/cm2 @ 22° C.
Temperatures shown in black are °F., those in red are °C.
Before
specifying any disk, see table of manufacturing ranges and
notes.
MANUFACTURING RANGES FOR SOLID METAL DISKS
| Desired
Pressure Rating |
Test
specimens must rupture within limits below of the pressure you
specify |
| PSIG |
Plus |
Minus |
| 66 -100 |
9 psig |
5 psig |
| 101
-150 |
12
psig |
6 psig |
| 151
-200 |
16
psig |
9 psig |
| 201
-350 |
23
psig |
12
psig |
| 351
-500 |
30
psig |
15
psig |
| 501 &
Up |
6
pct. |
3
pct. |
| Desired Pressure Rating |
Test specimens must rupture within limits below of the
pressure you specify |
| Kg/CM2 |
Plus |
Minus |
| 4.64 -7.03 |
.633 Kg/CM2 |
.352 Kg/CM2 |
| 7.10 -10.55 |
.844 Kg/CM2 |
.422 Kg/CM2 |
| 10.62 -14.06 |
1.125 Kg/CM2 |
.633 Kg/CM2 |
| 14.14 -24.61 |
1.617 Kg/CM2 |
.844 Kg/CM2 |
| 24.68 -35.16 |
2.11 Kg/CM2 |
1.055 Kg/CM2 |
| 35.23 & Up |
6
pct. |
3
pct. | |
3 /16" FLAT SEAT SOLID METAL DISKS-20,000 PSI MAX: Type B
| Disk
Material |
Unlined
Disks |
FEP Lined
Disks |
| Min.
Pres. |
Max.
Pres. |
Max.
Temp. |
Min.
Pres. 1 side |
Min.
Pres.
2 sides |
Max. Pres.
FEP 1/2 sides |
Max. Temp.
FEP |
| Aluminum |
220
15.5 |
1750
123.0 |
250
121 |
940
66.1 |
1190
83.7 |
1750
123.0 |
250
121 |
| Silver |
500
35.2 |
4500
316.2 |
250
121 |
1200
84.4 |
1450
102.0 |
3000
211.0 |
250
121 |
| Nickel |
770
54.1 |
20000
1407 |
750
399 |
1480
104.0 |
1730
121.7 |
10000
703 |
400
204 |
| Monel |
960
67.5 |
20000
1407 |
800
427 |
1760
123.8 |
2000
140.7 |
12000
844 |
400
204 |
| Inconel |
1250
88.0 |
20000
1407 |
900
482 |
2250
158.2 |
2500
175.8 |
13200
929 |
400
204 |
| 316
S.S. |
1750
123.0 |
20000
1407 |
900
482 |
3000
211.0 |
3250
228.4 |
13200
929 |
400
204 |
1/4 "
ANGULAR SEAT SOLID METAL DISKS-50,000 PSI MAX : Type B
| Disk
Material |
Unlined
Disks |
FEP Lined
Disks |
| Min.
Pres. |
Max.
Pres. |
Max. Temp. |
Min. Pres.
1 Side |
Min. Pres.
2 Sides |
Max. Pres.
FEP 1/2 Sides |
Max. Temp.
FEP |
| Aluminum |
160
11.2 |
2000
140.7 |
250
121 |
470
33.0 |
675
47.5 |
2000
140.7 |
250
121 |
| Silver |
360
25.3 |
6000
422 |
250
121 |
790
55.5 |
1000
70.3 |
2500
175.7 |
250
121 |
| Nickel |
550
38.6 |
35000
2460 |
750
399 |
1000
70.3 |
1200
84.4 |
10000
703 |
400
204 |
| Monel |
690
48.5 |
40000
2813 |
800
427 |
1190
83.7 |
1390
97.8 |
10000
703 |
400
204 |
| Inconel |
900
63.3 |
45000
3164 |
900
482 |
1500
105.5 |
1700
119.5 |
15000
1055 |
400
204 |
| 316
S.S. |
1250
88.0 |
50000
3516 |
900
482 |
1950
137.1 |
2150
151.2 |
15000
1055 |
400
204 |
1/2"
FLAT HEAD SOLID METAL DISKS -10,000 PSI MAX : TYPE B
| Disk
Material |
Unlined
Disks |
FEP Lined
Disks |
| Min.
Pres. |
Max.
Pres. |
Max.
Temp. |
Min.
Pres.
1 Side |
Min.
Pres.
2 Sides |
Max.
Temp.
FEP
1 Side |
Max. Temp.
FEP |
| Aluminum |
90
6.33 |
1000
70.3 |
250
121 |
275
19.3 |
380
26.7 |
1000
70.3 |
250
121 |
| Silver |
190
13.4 |
1700
119.5 |
250
121 |
400
28.1 |
510
35.8 |
1700
119.5 |
250
121 |
| Nickel |
300
21.1 |
7500
527 |
750
399 |
500
35.2 |
610
42.8 |
3750
263.8 |
400
204 |
| Monel |
375
26.4 |
7500
527 |
800
427 |
575
40.4 |
685
48.1 |
4500
316.2 |
400
204 |
| Inconel |
500
35.2 |
10000
703 |
900
482 |
725
51.0 |
835
58.7 |
5000
352 |
400
204 |
| 316
S.S. |
700
49.2 |
10000
703 |
900
482 |
950
66.8 |
1060
74.6 |
5000
352 |
400
204 |
7/16" FLAT SEAT SOLID METAL DISKS 20,000 PSI MAX : Type
B
| Disk
Material |
Unlined
Disks |
| Min.
Pres. |
Max.
Pres. |
Max.
Temp. |
| Nickel |
7,500
527 |
15,000
1,055 |
750
399 |
| Monel |
7,500
527 |
18,000
1,266 |
800
427 |
| Inconel |
10,000
703 |
20,000
1,407 |
900
482 |
| 316
S.S. |
10,000
703 |
20,000
1,407 |
900
482 |
Notes:
1.
Vacuum supports are not available for 3/16", 1/4", 7/18" or 1/2" flat seat
Type B disks. All disks in these groups with ratings greater than 1 1/2
times the unlined minimums will stand full vacuum without a vacuum
support.
2. Linings on Type B Disks have very little creep resistance.
Operating margin for lined disks must be greater than for unlined
disks.
3. Liners are sheet form bond to disk metal. All liners have
passed spark test to assure pinhole-free
condition. |
|
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