S-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)
  • Designed for non-fragmentation, recommended for Relief Valve isolation
  • Damage safety ratio ≤ 1.5
  • 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

S-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 316SS 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 25 125 1000 8.62 68.95 150 1000 10.3 68.95 150 1000 10.3 68.95 328 1000 22.60 68.95 75 125 5.17 8.61
1.5 40 90 1000 6.21 68.95 110 1000 7.58 68.95 110 1000 7.58 68.95 282 1000 19.40 68.95 54 90 3.72 6.20
2 50 75 1000 5.17 68.95 90 1000 6.21 68.95 90 1000 6.21 68.95 230 1000 15.90 68.95 45 75 3.10 5.17
3 80 60 1000 4.14 68.95 72 1000 4.96 68.95 72 1000 4.96 68.95 167 1000 11.50 68.95 36 60 2.48 4.14
4 100 50 800 3.45 55.20 60 800 4.14 55.16 60 800 4.14 55.16 60 800 4.14 55.16 30 50 2.06 3.45
6 150 40 800 2.76 55.20 48 800 3.31 55.16 48 800 3.31 55.16 92 800 6.34 55.16 24 40 1.65 2.76
8 200 35 700 2.41 48.26 42 700 2.89 48.26 42 700 2.89 48.26 42 700 2.89 48.26 - - - -
10 250 30 700 2.07 48.26 36 700 2.48 48.26 36 700 2.48 48.26 36 700 2.48 48.26 - - - -
12 300 27 600 1.87 41.37 33 600 2.28 41.37 33 600 2.28 41.37 33 600 2.28 41.37 - - - -
14 350 25 500 1.72 34.47 30 500 2.07 34.47 30 500 2.07 34.47 30 500 2.07 34.47 - - - -
16 400 23 100 1.58 6.89 28 475 1.93 32.75 28 475 1.93 32.75 28 475 1.93 32.75 - - - -
18 450 22 92 1.52 6.34 26 475 1.79 32.75 26 475 1.79 32.75 26 475 1.79 32.75 - - - -
20 500 21 84 1.45 5.79 24 250 1.65 17.25 24 250 1.65 17.25 24 250 1.65 17.25 - - - -
24 600 20 70 1.38 4.48 22 250 1.52 17.24 22 250 1.52 17.24 22 250 1.52 17.24 - - - -
30 750 20 70 1.38 4.48 20 250 1.38 17.24 20 250 1.38 17.24 20 250 1.38 17.24 - - - -
36 900 20 70 1.38 4.48 20 250 1.38 17.24 20 250 1.38 17.24 20 250 1.38 17.24 - - - -
40 1000 20 70 1.38 4.48 20 250 1.38 17.24 20 250 1.38 17.24 20 250 1.38 17.24 - - - -

Note: Consult BS&B for applications where the disk may be rated with a coincident temperature below 300°F (149°C) (176°F (80°C) for Hastelloy) but operated at a higher value. Special processing may be required. 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

Sta-Saf System
Burst Alert Sensors
Saf-T-Change™ QDR Rupture Disk Replacement System
Detec Saf Alarm System - Burst Disk Monitor

Installations

Sta-Saf™ System Installation Instructions

Overview

The compression loaded S-90™ Rupture Disk (Bursting Disc) offers an extended service life under pressure cycling conditions compared to a conventional tension loaded disk. The S-90™ Rupture Disk (Bursting Disc) exhibits excellent fatigue resistance in cyclic pressure service, surviving 1,000,000 pressure cycles from 0-90% of its marked burst pressure. The S-90 is a domed, solid metal, precision scored reverse buckling disk, which, upon over-pressure, reverses and opens along pre-weakened cross-score lines to provide a full relief opening.

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

The S-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, Monel® (Nickel alloy 400), Inconel® (Nickel alloy 600), Hastelloy® C-276, & Aluminum. Fluoropolymer film liners are offered with the type S-90™ Rupture Disk (Bursting Disc) at all burst pressures. All standard disks are available with 0%, 5%, and 10% manufacturing ranges.

 

Burst Alert™ Sensors & SmartDisk™ System

Burst Alert Sensors are installed downstream of the Rupture Disk (Bursting Disc) device and provide a convenient means of generating an electrical signal when appropriately integrated into plant control systems, or connected to the BS&B Safety Systems Burst Disk Monitor. The Burst Alert Sensor is a “membrane switch” that changes from closed circuit to open circuit when the upstream Rupture Disk (Bursting Disc) (or relief valve) opens.

Installation in SRI-7RS™, SRB-7RS™, SRB-7FS™, S90-7R™, SPR-7R™, or SR-7R™ Safety Head

The Sta-Saf family of Rupture Disk (Bursting Disc) devices is designed for installation between pipe flanges. Compatibility with all international flange standards is available, including: ANSI, DIN, JIS, BS, ISO, AFNOR and UNI. Between the Safety Head and the pipe flanges an application compatible gasket is used for sealing purposes.