Rupture Discs – Type BK

Rupture Discs Type BK are cross-scored, full-metal pressure relief devices designed for medium to high-pressure applications, elevated temperatures and significant pressure fluctuations. Manufactured from nickel, Inconel, Hastelloy* or stainless steel, they deliver robust, predictable performance in demanding process environments.

The scoring is precisely machined on the atmosphere side of the disc, while the process-facing side remains smooth to minimise medium adherence and contamination. When the system pressure exceeds the specified set point, the disc opens along the cross-scoring, providing instantaneous pressure relief.

Design & Performance

• Cross-scored geometry for controlled, repeatable opening
• Full-metal construction in nickel, Inconel, Hastelloy* or stainless steel
• Optimised for medium and high pressures with fluctuating load conditions
• High resistance to temperature and pressure cycling
• Smooth process side to prevent product build-up and facilitate cleanability
• Cross-pattern design requires only half the nominal diameter as an opening space
• Suitable for compact installations where space is restricted

Installation & Typical Applications

Rupture Discs Type BK are mounted:

• Directly between EN 1092 standard flanges
• Directly between ASME B16.5 standard flanges
• Within the BHS bursting disc holder system

They are widely used as either primary overpressure protection or in combination with safety valves to enhance system reliability in:

• Reactors and process vessels
• Pressure vessels and storage tanks
• Gas cylinders and high-pressure gas systems

Rupture Discs Type BK offer a compact, high-integrity relief solution where fast response, reliable opening behaviour and minimal installation space are non-negotiable.

Technical Specifications: