RB-90™ Reverse Buckling Rupture Disk

Knife Blade Technology Reverse Buckling Disk

RB-90™ Reverse Buckling Rupture Disk

Performance Features

  • Designed for gas service (acceptable for liquid service with a compressible gas/vapor pocket)
  • Suitable for operating pressure to 90% of the marked burst pressure (95% of the minimum burst pressure)
  • Designed for non-fragmentation, recommended for relief valve isolation
  • Suitable for cycling service
  • Vacuum resistant
  • Back pressure resistance can be specified
  • Optional fluoropolymer liner/coating
  • Available with ASME “UD” (select 0%, -5%, -10% Manufacturing Design Range)
  • Pressure Equipment Directive “CE” marking and/or other International Certifications.
  • BS&B proprietary technology

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  • Sizes & Pressures
  • Burst Tolerance
  • Safety Heads & Sensors
  • Accessories
  • Documentation

Sizes & Pressures

RB-90™ Disk Specifications Minimum/Maximum Pressure with Rating at 72° (22°C)

Disk Size Nickel Alloy 200 & Monel® Alloy 400 Inconel® Alloy 600 Hastelloy® Alloy C-276 and 316 Tantalum Aluminum
in mm psig barg psig barg psig barg psig barg psig barg
min max min max min max min max min max min max min max min max min max min max
1 25 100 1600 7 110 100 1800 7 124 100 1600 7 124 100 1600 7 110 30 250 2 17
1.5 40 80 1500 6 103 80 1700 5.5 117 80 1700 5.5 117 80 1500 5.5 103 25 200 2 14
2 50 50 1400 3.5 97 50 1600 3.5 110 50 1600 3.5 110 50 1400 3.5 97 22 150 2 10
3 80 45 1300 3 90 45 1500 3 103 45 1500 3 103 45 1300 3. 90 20 125 1 9
4 100 40 1300 3 90 40 1500 3 103 40 1500 3 103 40 1300 3. 90 20 100 1 7
6 150 35 800 2 55 35 850 2 59 35 850 2 59 35 800 2 55 20 80 1 6
8 200 25 750 2 52 25 800 2 55 30 800 2 55 - - - - 15 60 1 4
10 250 25 750 2 52 25 800 2 55 30 800 2 55 - - - - 15 60 1 4
12 300 25 750 2 52 25 800 2 55 30 800 2 55 - - - - 15 60 1 4
14 350 25 750 2 52 25 800 2 55 30 800 2 55 - - - - 15 60 1 4
16 400 25 750 2 52 25 800 2 55 30 800 2 55 - - - - 15 60 1 4
18 450 25 500 2 35 25 500 2 35 30 500 2 35 - - - - 13 40 1 3
20 500 25 500 2 35 25 500 2 35 30 500 2 35 - - - - 13 40 1 3
24 600 25 500 2 35 25 500 2 35 30 500 2 35 - - - - 10 35 1 2
30 750 25 250 2 17 25 250 2 17 30 250 2 17 - - - - 10 35 1 2
36 900 25 250 2 17 25 250 2 17 30 250 2 17 - - - - 10 35 1 2
40 1020 Consult BS&B
42  
Note: Tantalum RB-90 rupture disks are available in sizes 1” to 6” (25mm to 150mm). Consult BS&B for applications where the disk may be rated with a coincident specified temperature below the maximum process temperature to which the disk may be exposed. 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%

Accessories

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

Jackscrews

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

RB-90™ Reverse Buckling Disks
Burst Alert Sensors
Saf-T-Change™ QDR Rupture Disk Replacement System
Detec Saf Alarm System - Burst Disk Monitor

Installations

RB-90™ Rupture Disk (Bursting Disc) and RB-7R, RB-7FF, RB-7FS Safety Heads Installation Instructions
Burst Alert Leak Dectector Installation Instruction
Burst Alert Sensor Installation Instruction

Overview

The RB-90 Rupture Disk (Bursting Disc) has four razor sharp blades that cut the disk into four equal segments without fragmentation. No process contamination by metal. The RB-90 Rupture Disk (Bursting Disc) enables systems to be operated at pressures up to 90% of the tagged burst pressure ... as compared to a maximum of 70 to 80% for tension loaded solid metal and composite disks.

RB-90™ Rupture Disk (Bursting Disc) Material Options

The RB-90™ Rupture Disk (Bursting Disc) is available in a range of corrosion resistant materials. Standard disk materials are Nickel alloy 200, Stainless Steel grade 316, Inconel® (Nickel alloy 600), Monel® (Nickel alloy 400) & Aluminum. All standard disks are available with 0%, 5%, and 10% manufacturing ranges.

 

Product Buildup is Reduced

RB-90™ Rupture Disk (Bursting Disc) resist product buildup. Only the smooth convex side is exposed to system contents. The vacuum support under a conventional disk has an irregular surface which tends to allow a much faster product buildup. The use of RB-90 disks therefore cut maintenance costs by greatly extending the length of time between Safety Head disassemblies for cleaning. RB-90™ Rupture Disk (Bursting Disc) metals are thicker than those used in conventional solid disks of the same size and pressure rating, so vacuum supports are not required. The RB-90™ Rupture Disk (Bursting Disc) can also withstand high back pressure without damage.

 

Installation in RB-90™ Safety Head

RB-90™ Safety Heads require pre-assembly of reverse buckling disk in RB-90™ flanges to assure proper seating. Standard RB-90™ Safety Heads inlet and outlet flanges are flatfaced. Ring joint, raised face and tongue-and-groove facings are available. Standard knife blade material is heat treated stainless steel.