BS&B Custom Engineered Products: rupture disk assemblies FRB / QRB / MRB / XT

Not every overpressure problem fits between two flanges. BS&B’s Custom Engineered Products group supplies rupture disks already built into their own body: soldered, welded, crimped or threaded assemblies that an OEM installs like a fitting. The device is single use, quality requirements are tailored to the customer, and volumes range from a handful of prototypes to high-volume production.

BS&B describes every custom product as the sum of three choices: disk technology + application interface + options = solution.

Disk technology

Five rupture disk types cover most custom engineered products. Other BS&B disk types can be built in on request.

Disk	Sizes	Burst range	Best for
LPS	25 – 300 mm	0.34 – 4.8 bar	Low pressure reverse buckling; full vacuum resistance without a support
FRB / FRB-L	3 – 25 mm	1 – 67 bar	Reverse buckling disk in a compact body; FRB for gas, FRB-L for liquid
QRB	6 – 19 mm	24 – 1172 bar	Very high pressure in a small envelope
MRB	6 – 200 mm	100 – 4800 bar	Extreme pressure with corrosion-resistant alloys
XT	6 – 200 mm	3.4 – 2000 bar	Cross-scored forward acting disk in a machined body

The LPS and XT are also standard flanged disks; see the LPS and XT pages for their safety-head versions.

Application interface

The disk is supplied in the connection the equipment needs: threaded, welded, clamped, in-line, bolted or torqued. Standard assemblies are available from stock designs; fully custom bodies are developed to the customer’s envelope, connection and certification requirements.

Options

Every order includes a burst test certificate and protective packaging. Typical additions are customised packaging, special cleaning, specific certifications and quality standards, leak testing, validation testing and inventory management for repeat production.

Prototypes

New designs go through the Prototype Introduction Track (PIT), a dedicated team that handles prototype orders with schedule management and direct access to engineering and quality from design to delivery.

Selection data we need

Connection type and thread or weld specification, envelope dimensions, burst pressure and temperature, medium, operating pressure, quantity and the certification required.