BS&B 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.
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.
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

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.