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

The ECO-SAF System

The ECO-SAF System

The type ECR reverse buckling Compression Loaded Style Disk provides over pressure relief in either gas/vapor or liquid application. The ECR disk is designed with a perforated circular score in the perimeter of the dome. Gaskets which are activated by assembly of safety head, cover the perforated score line to achieve a sealed construction. The snap action of reverse buckling disk technology enables very low burst pressures to be achieved avoiding the use of weaker slotted composite disk designs .At the disks burst pressure the disk reverse, opening along this perforated score line, relieving the overpressure.

Applications

  • Overpressure protection at the lowest available reverse buckling burst pressures.
  • Prevent fugitive emission from API storage vessels. The ECR disk may be installed below the emergency fire vent. Isolating the vent and eliminating leakage of the stored fluid. The vessels normal breathing vent will continue to operate.
  • Relief valve isolation, an ECR disk may be installed at the inlet of a safety relief valve offering the following benefits:
  • Reduces fugitive emissions.
  • Less expensive valve trim may be used in corrosive applications.
  • Valve life is extended by isolating valve parts from corrosive fluid.

Features & Benefits

  • Sizes from 1" (25 mm) to 24 " (600 mm)
  • Lowest burst pressure in a reverse buckling style disk.
  • Designed to be non-fragmentation.
  • Overpressure relief for either gas /vapor or liquid applications.
  • Suitable for operation pressures up to 90% of the minimum burst pressure.
  • High performance in pressure cycling or pulsating conditions.
  • If installed damaged, disk will burst at the nominal burst pressure.
  • Back pressure resistance from 0.5 and up to 2 times tagged burst pressure subjected to process conditions
  • Vacuum resistance. (May require additional vacuum support.)
  • Low torque sensitivity
  • Disk acts as a positive seal to prevent fugitive emissions.
  • Smooth convex disk surface suitable for hygienic or polymerization applications.
  • Ideal for relief valve isolation.
  • Standard materials, Nickels, Alloys 200, Monel Alloy, Inconel Alloy 600, 316SS, Hastelloy C-276 and Tantalum.
  • Patent No: 5,368,180, 5,413,237, and 4,751,938.

The ECR disk is a low-pressure reverse buckling disk designed with perforated circular score in the perimeter of the dome. When overpressure occurs, the disk reverses and opens along the perforated score line and folds around the pivot in the outlet of the Safety head. The pivot ensures that the disks petal is retained after rupture.

Operating Ratio

A 90% operating ratio allows the process to operate up to 90% of the maximum burst pressure without affecting the disks service life.
*Ratio of operating pressure to burst pressure.

Materials

The ECR disks are available in 316SS, Nickel Alloy 200, Monel Alloy 400 and Inconel Alloy 600, Hastelloy C-276 or Tantalum. The standard gasket materials are Buna N, Viton and FEP/PTFE.
(Consult BS&B for alternatives.)

Pressure Cycling & Pulsating Service

The ECR disk will have a superior life in pressure cycling or pulsating conditions.

Vacuum or Back Pressure Rating

The vacuum or backpressure resistance capability is from 0.5 and up to 2 times the disks vacuum or backpressure resistance, rating should be specified when ordering. If required, an integral vacuum support for vacuum may be supplied with disk type ECV. The resultant flow capacity will be reduced by up to 16% (consult BS&B).

Non-Fragmenting

The type ECR disk is designed to be non-fragmenting on rupture.

Operating Temperatures

The operating temperature range is dependent on the choice of the integrated gasket seal materials.

Gaskets

The disks are supplied with gaskets attached to both sides of the disk.

Gasket Seal Material Temperature Range
Buna N -60°F to 230°F    -51°C to 110°C
Viton -50°F to 400°F    -46°F to 204°C
FEP/PTFE* -50°F to 400°F    -46°C to 204°C

*Process side of disk

Low Damage Ratio

If a disk is accidentally damaged before or during installation, the disk will burst at a pressure not exceeding its tagged burst pressure in the reverse buckling direction.

Sanitary & Aseptic Applications

Eco – Saf rupture disks (bursting discs), in non-contaminating materials, presenting a smooth disk surface towards the process are ideal for sanitary and aseptic applications. The disk’s sanitary gasket provides a leak tight seal when installed in its holder Type ER-C and secured by standard sanitary clamps.

Type ECR-S provides vacuum relief with full opening and positive pressure resistance from 0.5 and up to 2 times marked burst pressure subject to process conditions.

Type V/ECR-S provides overpressure relief with full opening and vacuum/back pressure resistance from 0.5 and up to 2 times marked burst pressure subject to process conditions.

Type V/ECT-S is an inverted two-way disk providing both vacuum and overpressure relief. The disk is suitable for operating pressures up to 90% of the minimum vacuum burst pressure, and up to 70 % of the burst pressure in the overpressure direction. Full opening in overpressure relief, and up to 16% reduction in flow capacity in vacuum relief.

Low Reversal Ratio

If a type ECR or V/ECR disk and holder is accidentally installed in the wrong direction, the disk will burst at a pressure between 0.5 and 2.0 times its burst pressure. The maximum reversal pressure may be specified when ordering.

Manufacturing Range

A manufacturing range of 0%, 5% or 10% is available and is applied to the minus side of the requested burst pressure. A disk with a requested burst pressure of 3 psig( 0.21 barg) and a 10% manufacturing range will be marked at a burst pressure between 2.7 psig (0.19 barg) and 3 psig ( 0.21barg ). A disk with a 0% manufacturing range will be marked at the requested burst pressure.

Tolerance

The burst tolerance is the maximum variation from the marked burst pressure. Each disk will be additionally marked with both minimum and maximum burst pressure.

Marked Burst Pressure Tolerance
5 psig (0.34 barg) and above +/- 10%
Less than 5 psig (0.34 barg) +/- 15%

Other Disk Types

The V/ECR and V/ECV are inverted styles of the types ECR and ECV rupture disks (bursting discs) for very low burst pressure in the case of vacuum relief.

  • Type V/ECR provides vacuum relief with full opening and positive pressure resistance from 0.5 and up to 2 times the marked burst pressure subject to process conditions.
  • Type V/ECV provides vacuum and is supplied for relief with positive pressure support on the vent side. This support offers positive pressure resistance and up to 16% reduction in flow capacity.

Type ECT is a two-way disk providing both overpressure and vacuum relief. The disk is suitable for operating pressures up to 90% of the minimum burst pressure in the overpressure direction and up to 70 % of the burst pressure in the overpressure direction. Full opening in overpressure relief and up to 16% reduction in flow capacity in vacuum relief. Sizes 2" to 6".

Type V/ECT is an inverted two-way disk providing both vacuum and overpressure relief. The disk is suitable for operating pressures up to 90% of the minimum vacuum and up to 70 % of the vacuum rating. Full opening in vacuum relief and up to 16% reduction in flow capacity in overpressure relief. Sizes 2" to 6".

Rupture Disk (Bursting Disc) Sensor

An EC-Alert sensor provides immediate warning of a ruptured disk when used with a BS&B Burst Disk Monitor or other suitable electrical monitoring equipment. The EC-Alert sensor is available for all disk types including the two-way ECT type.

Safety Heads

Disk Type Safety Head Type
ECR, ECV EC-7RS, EC-7R
ECT EC-7RS(1)
V/ECR, V/ECV VEC-7RS, VEC-7R(2)
V/ECT VEC-7RS(1)
ECR-S ER-C(3)
V/ECR-S VER-C(2)(3)
V/ECT-S VER-C(1)(3)

(1) Ensure flow arrows on the Safety Head point in the desired flow direction upon disk rupture.

(2) Types EC-7RS, VEC-7RS are pre torquable safety heads. Types EC-7R and VEC-7R are " spool " design safety heads and are installed in the process by clamping between standard pipe flanges (ANSI, DIN, JIS and API)

For holder dimensions refer to catalog 77-4015, Page 7, and holder type SR-C (3)

Type EC-7RS Safety Head (Sizes 1 – 24 Inches)

The ECR disk may be installed in the EC-7RS safety head and the cap screws torque to provide the correct load on the disk on the workshop before installation in the process. The pretorquable feature minimizes the possibility of process leakage or permanent disk failure due to incorrect torque.

Asymmetric locating pins center the disk in the safety head ensuring the correct direction of the disk installation.

Application of the correct integral cap screw torque activates the disk integral gasket to achieve bubble tight construction. The safety head is designed with a unique metal-to-metal stop, preventing over torquing and consequential damage to the disk. Flow arrows indicate the direction of the process flow during venting. The EC-7RS Safety Head may be removed from service, inspected and re-installed without affecting the rupture disk’s burst pressure provided the cap screws are not loosened.

The safety head is designed to fit inside NSI, DIN and JIS pipe flange bolting patterns and is made from 316SS, Carbon Steel, Aluminum, Alloy 400, Alloy 600, Hastelloy C-276. Alternate materials may be requested.

EC-7RS Safety Head Specifications

Nominal Size
Safety Head Flange Rating
Safety Head Thickness A
Dimensions
X Y
Inches
mm
ANSI
DIN
JIS
Inches
mm
Inches
mm
Inches
mm
1
25
150
-
-
1.34
34
2.63
67
2.63
67
1
25
300/600
6/10/16/25/40
10/16/20/25/40
1.34
34
2.88
73
2.88
73
1.5
40
150
-
10/16/20
1.52
39
3.38
86
3.38
86
1.5
40
300/600
6/10/16/25/40
30/40
1.52
39
3.75
95
3.75
95
2
50
150/300/600
6/10/16/25/40
10/16/20/30/40
1.70
43
4.13
105
4.13
105
3
80
150/300/600
6/10/16/25/40
16/20/30/40
2.08
53
5.25
133
5.25
133
3
80
-
-
10
2.08
53
4.75
121
4.75
121
4
100
150/300
6/10/16/25/40
16/20/30/40
2.70
69
6.25
159
6.25
159
4
100
-
-
10
2.70
69
 Flower Petal
4
100
600
-
-
2.70
69
 7.63" OD/194mm OD
6
150
150/300
6/10/16/25/40
10/30/40
3.44
87
 Flower Petal
6
150
-
-
16/20
3.44
87
 Flower Petal
6
150
600
-
-
3.44
87
 10.38" OD/264 mm OD
8
200
150/300
-
-
3.71
94
 Flower Petal
10
250
150/300
-
-
5.80
147
 Flower Petal
12
300
150
-
-
5.80
147
 16" OD/406. mm OD
12
300
300
-
-
5.80
147
 16.50" OD/419 mm OD 
14
350
150
-
-
6.15
156
 17.75" OD/451 mm OD
14
350
300
-
-
6.15
156
 19" OD/483 mm OD
16
400
150
-
-
7.40
188
20.125"OD/511mm OD 
16
400
300
-
-
7.40
188
 21.125" OD/536 mm OD
18
450
150
-
-
8.10
206
21.5"OD/546 mm OD 
18
450
300
-
-
8.10
206
 23.38" OD/594 mm OD
20
500
150
-
-
8.84
225
 23.75" OD/603 mm OD
20
500
300
-
-
8.84
225
 25.63"OD/651 mm OD
24
600
150
-
-
10.28
261
 28.13" OD/714 mm OD
24
600
300
-
-
10.28
261
 30.38" OD/771.5 mm OD

Type EC-7R Safety Head (Sizes 1 – 24 Inches)

This is a spool design to fit regular light duty ANSI, DIN, JIS and API flange systems for low-pressure service. Asymmetric locating pins center the disk in the safety Head, and ensure correct direction of disk installation .The EC-7R Safety Head has three flange connections, one at the center where the ECR disk is installed, one at the inlet, and one at the outlet flange. On installation of the safety head assembly between pipe flanges, application of the correct torque to the flange bolts activates the disk’s gasket to achieve a seal. The safety head is designed with metal-to-metal stop to prevent over torquing and consequential damage to the disk. Flow arrows indicate the direction of flow during process venting.

When the disk ruptures, the petal is fully contained within the EC-7R Safety Head outlet. This eliminates interference with downstream vents or instrumentation. Eyebolts are available for ease of manipulation of the Safety Head, especially useful for larger sizes.

The EC-7R Safety Head is available in 316SS, Carbon steel, Aluminum or composite low mass material. Alternate materials may be requested.

EC-7R Safety Head Specifications

Nominal Size
Outside Diameter A
Safety Head Height B
ANSI 150
DIN 16
Inches
mm
Inches
mm
Inches
mm
Inches
mm
1
25
2.5
64
2.8
71
2.38
60
1.5
40
3.25
83
3.62
92
3.00
76
2
50
4.0
102
4.21
107
4.00
102
3
80
5.25
133
5.59
142
5.13
130
4
100
6.75
172
6.38
162
6.25
159
6
150
8.63
219
8.54
218
8.68
220
8
200
10.88
276
10.71
273
11.30
287
10
250
13.25
337
12.91
327
14.00
355
12
300
16.00
406
15.08
383
16.75
425
14
350
17.63
448
17.44
443
18.62
473
16
400
20.13
511
19.49
495
21.35
542
18
450
21.50
546
21.85
555
24.00
610
20
500
23.75
604
24.29
617
26.75
679
24
600
28.13
714
28.9
734
32.00
813