Performance Features

  • Superior high pressure cycle resistance / life
  • Circular Scored Opening
  • Pressure Cycle Resistant
  • Disk sizes: 1/4” (6mm), 3/8” (9mm), 1/2” (12mm) and 3/4” (19mm)
  • Resists full vacuum
  • 90% operating ratio
  • Standard burst tolerance ±5%
  • Gas or liquid service capability (specify)
  • Back pressure resistance always equal to burst rating; can be manipulated between 1.0 and 1.5 rating
  • Standard materials: 316ss, nickel 200, Inconel® 600, Hastelloy® C and Monel®
  • US and International patents pending

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  • Sizes & Pressures
  • Burst Tolerance
  • Accessories
  • Documentation

Sizes & Pressures

QRB™ Disk Specifications Minimum/Maximum Pressure with Rating at 72° (22°C)

Disk Size Burst Pressure
in mm psig barg
min max min max
0.25 6 800 17,000 55.16 1172.11
0.375 9 800 14,000 55.16 965.27
0.5 12 500 10,500 34.47 723.95
0.75 19 350 5,000 24.13 344.74

Note: Hastelloy® is a trademark of Haynes International Inc. Monel® and Inconel® are registered trademarks of Special Metals Corporation and its subsidiaries.

Burst Tolerance

Marked Burst Pressure Burst Tolerance
≤ 40 psig (2.76 barg) ± 2 psig (0.138 barg)
> 40 psig (2.76 barg) ± 5%


BS&B supplies many of the Accessories required to safely and conveniently install our overpressure relief devices and complementary products. Through our professional team and global network of sales engineers and procurement personnel, we are able to provide the highest quality accessory products to meet your installation requirements.

Saf-T-Change Quick Disk Replacement (QDR)

After activation, the replacement disk is quickly slid into place. Saving hours of lost production due to blown rupture disks.

Tell-Tale Assemblies & Excess Flow Valves/Gauges

A gauge tap in the outlet flange of the safety head may be considered when the safety head is installed in a vertical position.

Spare Safety Heads & Cap Screws


When activated, the jackscrews effectively separate the flanges, providing adequate clearance to remove or insert a safety head and external gaskets.

Lifting Lug Eye Bolts

Eye bolts are recommended when weight and/or accessibility is a factor in lifting safety heads.

Baffle Plate

When a safety head is free-vented to atmosphere, a baffle plate may be considered to disperse overpressure and absorb recoil.

Product Literature

QRB™ Quantum Reverse Buckling Rupture Disk
Custom Engineered Products
Threaded Rupture Disk Assemblies
Burst Alert Sensors
Detec Saf Alarm System - Burst Disk Monitor