OsecoElfab’s GTI Rupture Disc

The GTI, or Inverted Graphite Monoblock, rupture disc is a simple, graphite pressure relief device that offers an economical solution for a wide range of applications. With sizes ranging from 1” to 24”, the GTI is ideal for applications that need an easy, inexpensive pressure safety device.  The GTI does not require an external holder and is intended to install directly into an ANSI RF or FF flange joint.  The GTI is designed for operation in applications where normal system pressures do not exceed 50% of the stamped burst pressure.

  • The GTI is available in line sizes ranging from 1 inch diameter all the way up to 24 inches diameter.
  • The GTI is available in burst pressures ranging from 0.5 psig all the way up to 400 psig.
  • The GTI is available in burst temperatures ranging from cryogenic temperatures all the way up to 365+ degrees F.
  • The GTI is only available in graphite materials of construction.
  • The GTI works well in gas or vapor services, as well as liquid or two-phase services.
  • The GTI is ASME UD stamped, with a Kr value of Krgl = 0.5.
  • The GTI has a 90% operating ratio, but only in static pressure services. This means the GTI operates reliably and with a long service life at pressures up to 90% of the marked burst pressure.  Pressure excursions above this 90% operating ratio will shorten the lifespan of the GTI, as will repeated pressure swings or oscillations between 50% to 90% of marked burst pressure.
  • The GTI 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 GTI 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 GTI is a graphite rupture disk, with potential for fragmentation. This means the GTI, and graphite rupture disks in general, cannot and should not be installed upstream from a pressure relief valve.
  • The GTI does not require a vacuum support.
  • The GTI is designed to be installed directly into an ANSI flange joint with raised facings or flat facings. No holder is required to use the GTI rupture disk.
  • The overall height of the GTI from line sizes 1 inch through 3 inch is only 5/8 inch tall. From line sizes 4 inch through 24 inch, the GTI is 7/8” tall.
  • The GTI is a flat, graphite rupture disk, with a flat inlet side, and a milled, or machined outlet side.  Process pressure is applied to the flat inlet side of the rupture disk.  Increasing process pressure induces crack formation and propagation through the thinned, or milled portion of the disk. At the burst pressure, brittle fracture failure occurs, and the central, milled portion of the disk shatters, allowing process fluid to escape through the rupture disk.
  • The GTI, like all flat, graphite rupture disks, does best in static pressure applications.  The GTI handles pressure cyclic services fairly well, but reverse acting metal rupture disks are typically recommended for services with oscillating pressures.
  • The GTI is designed, manufactured, and certified to ASME BPVC Section XIII requirements.
  • The factory must be consulted for MNFA values for the GTI rupture disk.
  • For a 1” GTI, the minimum burst pressure is 15 psig, and the maximum burst pressure is 400 psig.
  • For a 1.5” GTI, the minimum burst pressure is 10 psig, and the maximum burst pressure is 300 psig.
  • For a 2” GTI, the minimum burst pressure is 4 psig, and the maximum burst pressure is 250 psig.
  • For a 3” GTI, the minimum burst pressure is 3 psig, and the maximum burst pressure is 200 psig.
  • For a 4” GTI, the minimum burst pressure is 2 psig, and the maximum burst pressure is 150 psig.
  • For a 6” GTI, the minimum burst pressure is 2 psig, and the maximum burst pressure is 100 psig.
  • For an 8” GTI, the minimum burst pressure is 1 psig, and the maximum burst pressure is 100 psig.
  • For a 10” GTI, the minimum burst pressure is 1 psig, and the maximum burst pressure is 100 psig.
  • For a 12” GTI, the minimum burst pressure is 0.5 psig, and the maximum burst pressure is 100 psig.
  • For a 14” GTI, the minimum burst pressure is 0.5 psig, and the maximum burst pressure is 75 psig.
  • For a 16” GTI, the minimum burst pressure is 0.5 psig, and the maximum burst pressure is 75 psig.
  • For a 18” GTI, the minimum burst pressure is 0.5 psig, and the maximum burst pressure is 50 psig.
  • For a 20” GTI, the minimum burst pressure is 0.5 psig, and the maximum burst pressure is 50 psig.
  • For a 24” GTI, the minimum burst pressure is 0.5 psig, and the maximum burst pressure is 25 psig.