BS&B Rupture Disks

BS&B Forward Acting Rupture Disks

Forward acting, or conventional rupture disks (bursting discs) have been a mainstay in process applications since BS&B developed the first rupture in 1931. Developed in 1934, the Type B disk, the "granddaddy" of all rupture disks (bursting discs) is still the disk-of-choice in many applications.
Applying load to the concave side, the disk is subjected to tension forces. Forward acting disks regulate burst pressures by the tensile strength of the material.
For low burst pressures, the Type D disk has a slotted metal top section and a metal or fluorocarbon seal. For higher operating ratios, the scored NU-SAF family of disks is often selected for polymerization processes. Our VAC-SAF line offers protection from excessive vacuum or overpressure.
For tank car applications, the ITC disk protects intermodel tank containers while the SR-TC is a surge resistant disk for railroad took cars and over-the-road trailer service industry.
A wide range of standard rupture disk (bursting disc) assemblies is available for your specific application. These Threaded and Welded Assemblies are discarded after disk rupture. Customized designs are available for customer applications that cannot be met using standard assembly designs.

• XN-85™ - precision scored, high performance specially manufactured
by forming the disk first and then scoring
• XT™ - advanced rupture disk performance with an ‘X’ shaped score pattern; Designed for nonfragmentation; Excellent for relief valve isolation
• Scored B™ – nonfragmenting rupture disk opens along preweakened
score lines
• LCN™ - low pressure rupture disk with flat composite metal design
that withstands full vacuum
• D™ - composite disk consisting of a slotted metal top section and a
metal or fluoropolymer seal for low burst pressure
• B™ - prebulged, solid metal rupture disk; system pressure is applied
to the dished or concave side, subjecting disk metal to tension loading
• AV™ - rupture disk for atmospheric vessels and isolating outlet port
of relief valves; ready gasketted with fibre gaskets; direct installation
between companion flanges

BS&B bolted type Safety Heads are normally compatible with ANSI pipe flanges. The BS&B Quicksert FA-7R safety head is a reduced diameter flat faced flanged assembly that nests between the studs of two ANSI flanges. This holder is designed for the 30 degree angular seat design of the Type B and D rupture disks.

Each Burst Alert Sensor is designed to operate in a "normally closed"
electrical circuit. A polymer membrane is used to support an electrical
conducting circuit. When the pressure event (disk rupture/valve
opening) occurs, the flow of fluid places the polymer membrane in
tension which leads to the break of a tantalum electrical conductor.
This changes the electrical status of the sensor to "normally open."
Recommended operating limits for Burst Alert Sensors are a maximum
current of 500mA, maximum voltage 24 VDC; satisfactory
operation can be obtained at a few milliamperes current

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