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Model Sigma and Sigma EXL -Reverse Buckling Rupture Disks
The Sta-Saf™ Rupture Disk System from BS&B Safety Systems offers an extensive range of high-performance rupture disks engineered for specific applications and pressure conditions. Key models include Sigma & Sigma EXL, which feature enhanced performance, LPS and LSR designed for low-pressure, scored reverse buckling, and SKr for low flow resistance scenarios. The RLS variant is tailored for medium to high pressure conditions, while the S-90 provides cross-scored medium to high-pressure performance. High cycling needs are met by FRS and FRL, with frustum reverse buckling technology, and JRS caters to non-scored, low-pressure conditions. The SKI model is notable for its back pressure independence, and the SRD & SRD-L series serves low to medium pressure needs with scored reverse buckling functionality. BS&B's comprehensive rupturing solutions are critical in ensuring safety in complex industrial environments, offering precise and reliable pressure relief across diverse applications.
- Designed for gas, liquid and multi-phase service
- Suitable for operating pressure to 95% of the marked burst pressure (95% of the minimum)
- Designed for non-fragmentation, recommended for Relief Valve isolation
- Damage safety ratio ≤ 1
- Suitable for cycling service
- Vacuum resistant
- Available with ASME “UD” (select 0%, -5% Manufacturing Design Range)
- Pressure Equipment Directive “CE” marking and/or other International Certifications
- BS&B proprietary technology; US Patent 9,168,619 and international patents apply

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