OsecoElfab’s OPR+ and OPK+ Rupture Discs

OsecoElfab manufactures the OPR+ and the OPK+ rupture disks, which are high-performance, reverse acting rupture discs designed and manufactured for extremely demanding rupture disc applications.  The OPR+ is designed and intended for low to medium pressure applications, while the OPK+ is designed for medium to higher pressure applications. The OPR+ and the OPK+ uniquely feature an optional, hinged magnetic outlet ring that enables external detection of disk activation.  The discs are circumference-scored after the forming of their low crown into a hybrid frustrum / dome configuration. This process yields a high-performance disc able to withstand high operating pressures within the most difficult applications. The OPR+ and the OPK+ offers a smooth non-scored surface on the process side. This limits product accumulation on the disc and reduces the risk of polymerization and crystallization of media on the disc surface. The low KR value and high reliability make the OPR+ and the OPK+ an excellent choice for isolation of safety relief valves.

  • The OPR+ and the OPK+ are available in line sizes 1.0”, 1.5”, 2.0”, 3.0”, 4.0”, 6.0”, 8.0”, 10.0”, and 12.0”.
  • The OPR+ and the OPK+ are available in burst pressures ranging from 5 psig all the way up to 1160 psig.
  • The OPR+ and the OPK+ are available in burst temperatures ranging from cryogenic temperatures all the way up to 1000 degrees F.
  • The OPR+ and the OPK+ are 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 OPR+ and the OPK+ work well in gas or vapor services, as well as liquid or two-phase services.
  • The Kr value for the OPR+ is Krgl = 0.78 and, when used with the optional magnetic outlet ring, the Kr value is 1.7.
  • The Kr value for the OPK+ is Krgl = 1.5 and, when used with the optional magnetic outlet ring, the Kr value is 2.77.
  • The OPR+ and the OPK+ have a 95% operating ratio, meaning the OPR+ and the OPK+ operate reliably and with a long service life at pressures up to 95% of the marked burst pressure.  Pressure excursions above this 95% operating ratio will shorten the lifespan of the OPR+ and the OPK+.
  • The OPR+ and the OPK+ are only offered with a 0% Manufacturing Design Range (MDR), meaning there will never be any variation between what burst pressure you order, and what burst pressure is marked on the tag of the rupture disk.
  • The OPR+ and the OPK+ maintain or exceed the ASME-specified burst tolerances of +/- 5% of marked burst pressure for burst pressures above 40 psig, or +/- 2 psig for burst pressures at or below 40 psig.
  • The OPR+ and the OPK+ are a scored metal rupture disk, with a non-fragmenting design, meaning the OPR+ and the OPK+ can be installed upstream from a pressure relief valve.
  • The OPR+ and the OPK+ do not have a vacuum support.  The OPR+ and the OPK+ is designed to handle vacuum services without any additional design enhancements.
  • The OPR+ and the OPK+ are reverse acting metal rupture disks.  Process pressure is applied to the convex side of the rupture disk.  Increasing process pressure collapses the dome of the rupture disk until the dome inverts, and the metal yields and tears open along the scored lines.
  • The OPR+ and the OPK+, like all reverse acting metal rupture disks, do best in static pressure applications, but also handles pressure cyclic services extraordinarily well. The OPR+ and the OPK+ have been tested in excess of 1,000,000 full scale pressure cycles (0 psig to 95% of marked burst pressure and back down to 0 psig again), with no evidence of fatigue induced failure or alteration of burst pressure.
  • The OPR+ and the OPK+ are offered with an optional, hinged outlet ring with a magnet that pivots as the rupture disk bursts open. A Flo-Tel sensor is installed in front of the magnet, and detects when the magnet has moved position, indicating activation of the rupture disk itself.
  • The OPR+ and the OPK+ are designed, manufactured, and certified to ASME BPVC Section XIII requirements.
  • The OPR+ and the OPK+ is designed to pair with the OPR or OPK insert holders, as well as the OPR-P and OPK-P pretorqued insert holders, as well as the Safety Cartridge one-piece holder assembly.
  • The MNFA for a 1.0″ OPR+ is 0.78 square inches and, for the OPK+, it’s 0.79 square inches.
  • The MNFA for a 1.5″ OPR+ is 1.69 square inches and, for the OPK+, it’s 1.71 square inches.
  • The MNFA for a 2.0″ OPR+ is 2.84 square inches and, for the OPK+, it’s 2.90 square inches.
  • The MNFA for a 3.0″ OPR+ is 6.81 square inches and, for the OPK+, it’s 7.03 square inches.
  • The MNFA for a 4.0″ OPR+ is 10.96 square inches and, for the OPK+, it’s 11.17 square inches.
  • The MNFA for a 6.0″ OPR+ is 23.38 square inches and, for the OPK+, it’s 24.18 square inches.
  • The MNFA for an 8.0″ OPR+ is 44.18 square inches and, for the OPK+, it’s 45.46 square inches.
  • The MNFA for a 10.0″ OPR+ is 65.05 square inches and, for the OPK+, it’s 67.64 square inches.
  • The MNFA for a 12.0″ OPR+ is 94.86 square inches and, for the OPK+, it’s 99.29 square inches.
  • A 1.0” OPR+ has a minimum burst pressure of 100 psig and a maximum burst pressure of 250 psig.
  • A 1.0” OPK+ has a minimum burst pressure of 250 psig and a maximum burst pressure of 1160 psig.
  • A 1.5” OPR+ has a minimum burst pressure of 25 psig and a maximum burst pressure of 250 psig.
  • A 1.5” OPK+ has a minimum burst pressure of 250 psig and a maximum burst pressure of 1087 psig.
  • A 2.0” OPR+ has a minimum burst pressure of 15 psig and a maximum burst pressure of 250 psig.
  • A 2.0” OPK+ has a minimum burst pressure of 250 psig and a maximum burst pressure of 1015 psig.
  • A 3.0” OPR+ has a minimum burst pressure of 8 psig and a maximum burst pressure of 200 psig.
  • A 3.0” OPK+ has a minimum burst pressure of 200 psig and a maximum burst pressure of 507 psig.
  • A 4.0” OPR+ has a minimum burst pressure of 5 psig and a maximum burst pressure of 175 psig.
  • A 4.0” OPK+ has a minimum burst pressure of 175 psig and a maximum burst pressure of 363 psig.
  • A 6.0” OPR+ has a minimum burst pressure of 13 psig and a maximum burst pressure of 100 psig.
  • A 6.0” OPK+ has a minimum burst pressure of 100 psig and a maximum burst pressure of 320 psig.
  • An 8.0” OPR+ has a minimum burst pressure of 13 psig and a maximum burst pressure of 100 psig.
  • An 8.0” OPK+ has a minimum burst pressure of 100 psig and a maximum burst pressure of 300 psig.
  • A 10.0” OPR+ has a minimum burst pressure of 13 psig and a maximum burst pressure of 100 psig.
  • A 10.0” OPK+ has a minimum burst pressure of 100 psig and a maximum burst pressure of 274 psig.
  • A 12.0” OPR+ has a minimum burst pressure of 13 psig and a maximum burst pressure of 100 psig.
  • A 12.0” OPK+ has a minimum burst pressure of 100 psig and a maximum burst pressure of 250 psig.