BS&B · Rupture Disks
Ritec partnerBS&B SKr reverse buckling disk
Scored reverse buckling disk with a 90 % operating ratio and burst pressures from 0.6 to 34.5 bar, non-fragmenting, for gas, vapour and liquid service. The all-round Sta-Saf disk.
The SKr is the disk we quote most often. Its dome faces the process so the metal is in compression; when the burst pressure is reached the dome reverses and opens along pre-scored lines into a hinged petal that stays attached to the disk. There is nothing to fragment and nothing to travel downstream, which is exactly what you want when the disk sits under a safety relief valve or ahead of a flare header.
Compared with a forward-acting disk of the same rating, the SKr can run at a higher percentage of its burst pressure, needs no vacuum support down to full vacuum, and lasts far longer under cycling. Its very wide burst pressure range, from a few hundred millibar up to 34.5 bar, and the availability of aluminium as a standard material make it the default answer for most process duties.
Options
- Pre-torqued insert safety heads (SRI-7RS, SRB-7RS) for fast, repeatable installation
- Burst Alert sensor for remote indication of a burst
- Fluoropolymer liners for corrosive service
- Burst pressure calibration to ASME, CE/PED or both
Selection data we need
Size, burst pressure and temperature, operating pressure, medium, presence of vacuum or back pressure, flange standard and rating. For a replacement disk, photograph the tag: the lot number tells us everything.
Applications
- Primary relief on reactors, columns and storage vessels
- Upstream of safety relief valves (isolation)
- Cyclic and pulsating duty
- Low burst pressures where a forward-acting disk would need a vacuum support
