OsecoElfab’s CO Rupture Disc

The CO, or Composite, rupture disc is a simple, forward acting pressure relief device that offers an economical solution for a wide range of applications. With sizes ranging from 11/16” to 42”, the CO is ideal for applications with uncommon size requirements. The design is called a “composite” because it always incorporates at least distinct layers: a metal slotted top section (which controls the burst pressure), a slit-slot Teflon cover layer (which separates the metal above from the seal below), and either a fluoropolymer or metal seal (a solid sheet which holds back the process fluid and prevents leakage). The patented “tear drop” feature of the COT reduces the possibility of fragmentation on burst. The CO is designed for operation in applications where normal system pressures do not exceed 80% of the stamped burst pressure.

  • The CO is available in line sizes ranging from 11/16 inch diameter all the way up to 42 inches diameter.
  • The CO is available in burst pressures ranging from 3 psig all the way up to 1,000+ psig.
  • The CO is available in burst temperatures ranging from cryogenic temperatures all the way up to 900 degrees F.
  • The CO 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 CO works well in gas or vapor services, as well as liquid or two-phase services.  The CO works particularly well in sticky or fouling services.
  • The Kr value for the CO, is Krgl = 0.5, however when a vacuum support is required, the Kr value for the COV is Krgl = 2.37.
  • The CO has an 80% operating ratio, meaning the CO operates reliably and with a long service life at pressures up to 80% of the marked burst pressure.  Pressure excursions above this 80% operating ratio will shorten the lifespan of the CO.
  • The CO is offered with a standard 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 CO maintains or exceeds 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 CO is a non-scored metal rupture disk, with potential for fragmentation. This means the CO, and composite rupture disks in general, cannot and should not be installed upstream from a pressure relief valve.
  • The CO requires a vacuum support in most applications that involve vacuum.  The model name shifts to COV, the V for vacuum support.
  • The CO is designed with a 30° angular seat, and meant to be installed into holders with a matching seat design, such as the RDI, or the UT pipe union holder. The CO can be configured with a flat seat, and installed into flat seated holders like the FRDI, or FRDI-P.  This changes the model name to (F)CO, the (F) indicating a flat seat.
  • The CO is a forward acting metal rupture disk.  Process pressure is applied to the concave side of the rupture disk.  Increasing process pressure stretches the metal top section of the rupture disk until the metal yields and tears open between the holes drilled into the disk.
  • The CO, like all for forward acting metal rupture disks, does best in static pressure applications.  The CO handles pressure cyclic services fairly well, but reverse acting metal rupture disks are typically recommended, to ensure the tag stays attached to the disk for services with oscillating pressures.
  • The CO is offered at lower set pressures with a stiffening ring, to better keep the tag of the rupture disk attached.  This configuration is called the RCO, the R indicating a stiffening ring on the outlet side of the rupture disc.
  • The CO typically uses a Teflon liner on the inlet or wetted side of the rupture disk, and is offered with a PFA liner or shield on the outlet side of the rupture disk, to enhance corrosion protection. This configuration is called the LCO, the L indicating a Teflon liner on the outlet side of the rupture disc.
  • The CO can be enhanced to reduce the likelihood of fragmentation by welding a teardrop shaped piece of foil that retains the center of the rupture disk when it opens. This configuration is called the COT, where the T indicates the addition of the Teardrop.
  • The CO is designed, manufactured, and certified to ASME BPVC Section XIII requirements.
  • The CO is designed to pair with the RDI insert holder, as well as Union Type holders, TDH threaded disc holders, and Autoclave assemblies. In its flat seat configuration, the (F)CO is designed to pair with FRDI insert holders, as well as FRDI-P pretorqued insert holders.
  • The MNFA for a 1″ CO is 0.864 square inches
  • The MNFA for a 1.5″ CO is 2.036 square inches
  • The MNFA for a 2″ CO is 3.355 square inches
  • The MNFA for a 3″ CO is 7.393 square inches
  • The MNFA for a 4″ CO is 12.73 square inches
  • The MNFA for a 5″ CO is 28.89 square inches
  • The MNFA for a 6″ CO is 50.0 square inches
  • The MNFA for a 10″ CO is 75.74 square inches
  • The MNFA for a 12″ CO is 107.8 square inches
  • The MNFA for a 14″ CO is 137.8 square inches
  • The MNFA for a 16″ CO is 180.1 square inches
  • The MNFA for a 18″ CO is 233.7 square inches
  • The MNFA for a 20″ CO is 281.7 square inches
  • The MNFA for a 24″ CO is 405.9 square inches
  • The MNFA for a 28″ CO is 522.7 square inches
  • The MNFA for a 30″ CO is 634.7 square inches
  • The MNFA for a 32″ CO is 722.2 square inches
  • The MNFA for a 36″ CO is 914.3 square inches
  • The MNFA for a 40″ CO is 1194 square inches
  • The MNFA for a 42″ CO is 1244.9 square inches
  • For a 1” CO, the combined burst pressure range for all the standard OE materials (316 Stainless Steel, Nickel 200, Inconel 600, Monel 400, and Hastelloy C 276) runs from 44 psig up to a maximum burst pressure of 1000 psig.
  • For a 1.5” CO, the combined burst pressure range for all the standard OE materials (316 Stainless Steel, Nickel 200, Inconel 600, Monel 400, and Hastelloy C 276) runs from 31 psig up to a maximum burst pressure of 700 psig.
  • For a 2” CO, the combined burst pressure range for all the standard OE materials (316 Stainless Steel, Nickel 200, Inconel 600, Monel 400, and Hastelloy C 276) runs from 15 psig up to a maximum burst pressure of 555 psig.
  • For a 3” CO, the combined burst pressure range for all the standard OE materials (316 Stainless Steel, Nickel 200, Inconel 600, Monel 400, and Hastelloy C 276) runs from 11 psig up to a maximum burst pressure of 350 psig.
  • For a 4” CO, the combined burst pressure range for all the standard OE materials (316 Stainless Steel, Nickel 200, Inconel 600, Monel 400, and Hastelloy C 276) runs from 8 psig up to a maximum burst pressure of 415 psig.
  • For a 6” CO, the combined burst pressure range for all the standard OE materials (316 Stainless Steel, Nickel 200, Inconel 600, Monel 400, and Hastelloy C 276) runs from 6 psig up to a maximum burst pressure of 320 psig.
  • For an 8” CO, the combined burst pressure range for all the standard OE materials (316 Stainless Steel, Nickel 200, Inconel 600, Monel 400, and Hastelloy C 276) runs from 5 psig up to a maximum burst pressure of 295 psig.
  • For a 10” CO, the combined burst pressure range for all the standard OE materials (316 Stainless Steel, Nickel 200, Inconel 600, Monel 400, and Hastelloy C 276) runs from 4 psig up to a maximum burst pressure of 240 psig.
  • For a 12” CO, the combined burst pressure range for all the standard OE materials (316 Stainless Steel, Nickel 200, Inconel 600, Monel 400, and Hastelloy C 276) runs from 3 psig up to a maximum burst pressure of 200 psig.
  • For a 14” CO, the combined burst pressure range for all the standard OE materials (316 Stainless Steel, Nickel 200, Inconel 600, Monel 400, and Hastelloy C 276) runs from 3 psig up to a maximum burst pressure of 170 psig.
  • For a 16” CO, the combined burst pressure range for all the standard OE materials (316 Stainless Steel, Nickel 200, Inconel 600, Monel 400, and Hastelloy C 276) runs from 3 psig up to a maximum burst pressure of 150 psig.
  • For an 18” CO, the combined burst pressure range for all the standard OE materials (316 Stainless Steel, Nickel 200, Inconel 600, Monel 400, and Hastelloy C 276) runs from 3 psig up to a maximum burst pressure of 135 psig.
  • For a 20” CO, the combined burst pressure range for all the standard OE materials (316 Stainless Steel, Nickel 200, Inconel 600, Monel 400, and Hastelloy C 276) runs from 3 psig up to a maximum burst pressure of 120 psig.
  • The CO is not currently offered in a 22″ line size.
  • For a 24” CO, the combined burst pressure range for all the standard OE materials (316 Stainless Steel, Nickel 200, Inconel 600, Monel 400, and Hastelloy C 276) runs from 3 psig up to a maximum burst pressure of 100 psig.
  • For a 28” CO, the factory must be consulted to determine available burst pressure ranges.
  • For a 30” CO, the factory must be consulted to determine available burst pressure ranges.
  • For a 32” CO, the factory must be consulted to determine available burst pressure ranges.
  • For a 36” CO, the factory must be consulted to determine available burst pressure ranges.
  • For a 40” CO, the factory must be consulted to determine available burst pressure ranges.
  • For a 42” CO, the factory must be consulted to determine available burst pressure ranges.