OsecoElfab’s OPR and OPK Rupture Disc Holders

The OsecoElfab OPR and OPK Insert Rupture Disc Holders are reduced diameter, flat-faced flange assemblies that bolt between standard ANSI pipe flanges and fit within the bolt circle. The OPR and OPK have a flat seat and use an impingement point to create a metal-to-metal “bite” seal between the holder inlet ring, and the rupture disk inlet seat surface.  This holders allows the rupture disc to be preassembled to ensure it is properly seated before installation into the pressure systems. OPR and OPK Insert Holders are available in standard ANSI flange ratings up to 12″ and are offered in three overall height arrangements.

  • The OPR and OPK is for use with the PRO+, PRO+KRGL, PCR, PSR and PLR rupture disks.
  • The OPR and OPK is compatible with the AMS, SVT, and LPSF burst disk indicator sensors.
  • The OPR and OPK is available in line sizes ranging from 1 inch diameter all the way up to 12 inches diameter.
  • The OPR and OPK is compatible with service temperatures ranging from cryogenic temperatures all the way up to 900 degrees F.
  • The OPR and OPK is available in all OE standard materials (316 Stainless Steel, Nickel 200, Inconel 600, Monel 400, and Hastelloy C 276).  Other materials may be available or offered on request. The inlet ring material can be specified as a different material than the outlet ring material.
  • The OPR and OPK works well in gas or vapor services, as well as liquid or two-phase services.
  • The OPR and OPK may work well in sticky or fouling services, although alternative holders designs such as the TopHat Assembly are recommended in such environments.
  • The OPR and OPK is considered non-torque sensitive. While proper torque procedures should be followed during installation, the OPR and OPK is fairly tolerant of over-torque, or slightly uneven torque of the bolts on the companion flange.
  • The OPR and OPK typically uses a single locater pin, installed by the factory in the inlet ring, to ensure proper rupture disk orientation within the holders assembly. Each rupture disk, manufactured for installation into a OPR and OPK holders, will have a notch punched out of its seating surface to ensure the rupture disk must be oriented correctly, in order to be installed into the OPR and OPK at all.
  • The OPR and OPK is available in ANSI 150#, ANSI 300#, ANSI 600#, ANSI 900#, ANSI 1500#, and ANSI 2500# Flange Classes
  • The OPR and OPK is available in Raised Face, Flat Face, Crush Ring, and RTJ flange facing arrangements.
  • The OPR and OPK can be tapped for instrumentation on both the inlet and outlet rings.
  • The OPR and OPK can be offered as a double disk assembly, allowing for the installation of two rupture disks in series.
  • Kr values are specific to the rupture disk model used. As such, the OPR and OPK does not have its own, unique Kr value.
  • Operating Ratios are specific to the rupture disk model used. As such, the OPR and OPK does not have its own, unique operating ratio.
  • Manufacturing Ranges are specific to the rupture disk model used. As such, the OPR and OPK does not have its own, unique manufacturing range.
  • Burst Tolerances are specific to the rupture disk model used. As such, the OPR and OPK does not have its own, unique burst tolerance.
  • Fragmentation is specific to the rupture disk model used. As such, the OPR and OPK is neither fragmenting nor non-fragmenting.
  • A 1” OPR and OPK has a standard overall height of 1.75”. Custom height OPR and OPK’s are available upon request.
  • A 1.5” OPR and OPK has a standard overall height of 1.75”. Custom height OPR and OPK’s are available upon request.
  • A 2” OPR and OPK has a standard overall height of 1.75”. Custom height OPR and OPK’s are available upon request.
  • A 3” OPR and OPK has a standard overall height of 1.93”. Custom height OPR and OPK’s are available upon request.
  • A 4” OPR and OPK has a standard overall height of 2.31”. Custom height OPR and OPK’s are available upon request.
  • A 6” OPR and OPK has a standard overall height of 2.81”. Custom height OPR and OPK’s are available upon request.
  • An 8” OPR and OPK has a standard overall height of 3.43”. Custom height OPR and OPK’s are available upon request.
  • The factory should be consulted for the overall height of any OPR and OPK above an 8” line size.