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Reverse Buckling (Compression Loaded) Rupture Discs – Bursting Discs

FDC Reverse Acting Rupture Discs

These Reverse Types rupture discs are also known as Compression Loaded, Reverse Buckling or Reverse Acting bursting discs.

Ksrbkh Rupture Disc Cmc
Ksrrk Rupture Disc Cmc
Ksrsr Rupture Disc Cmc
Ksrr Rupture Disc Cmc

Reverse Buckling Bursting Discs

A compression loaded or reverse buckling rupture disc is installed into a system where the normal operating pressure is on the convex side of the formed crown. Reverse buckling discs are available in scored, sheared, or knife types. The dome reverses at the set pressure and then either opens along the scored grooves which part or the dome is cut or sheared in other designs.

It is essential to select the correct reverse buckling disc design for the duty. For example, a cross-scored design would be suitable for gas service and liquids in some cases, while a circular-scored design would be suitable for either gas or liquid or dual-phase service conditions.

Fdc Reverse Type Rupture Discs Cmc

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Reverse Bulking Rupture Disc Tolerance and Installation

Fdc Rupture Disc Installation Insert Assemby Between Flanges

Reverse buckling discs from FDC can be supplied with very tight manufacturing ranges and tolerances. They can be operated to 90% of their rated burst pressure for ratings greater than 40 PSIG or to 90% of the minimum burst pressure for ratings below 40 PSIG. Full Vaccum resistance is available without the need of vacuum support, depending on the burst pressure.

Reverse buckling discs need to be installed in their correctly designed holder/safety head. These holders are either insert or Pre-Torque designs and are inserted within the bolt circle of companion flanges. FDC also makes a patented reverse buckling disc design that inserts within the flanges without the need for a holder.

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KSRRK Reverse Acting Rupture Discs

  • Reverse Dome Shear Type (also known as Reverse Buckling – Compression loaded)
  • It is used with installation on FDC standard insert holder or Pre-Troque Type Holder/ Safety Head
  • It is integrated with Disc and Knife “similar to Shark teeth”
  • Shearing structure ruptured by knife ring attached to disc while dome is inverted
  • Can be operated reliably from full vacuum to 90% of its rated burst pressure
  • Non Fragmenting Design
  • Also available as KSRRKF: Reverse Dome Shear Type for Ferrule (Tri-Clamp Connection) (same as KSRRK but used with installation on Ferrule / TriClamp Connection without holder)
  • Standard as ASME Code Sec.VIII or ISO 4126
  • Sizes from 1/2″ to 24″
  • Set Pressure from 0.35 to 30 kg/cm2
  • Temperature from -200 degC to 600 degC
  • Process media can be in gas, vapor or liquid
  • Max Operation Ratio: 90%
Ksrrk Rupture Disc Cmc

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KSRSR Reverse Acting Rupture Discs

Ksrsr Rupture Disc Cmc
  • Reverse Dome Scored Type
  • It is used with installation on FDC standard holder
  • Carved structure ruptured while inverted along with Scored Line processed precisely
  • It is applied to medium/high pressure mainly
  • Highly safe and resistant to corrosion
  • Favourable for counterpressure, vacuum and pulsation conditions
  • Vacuum Support is needless
  • Wide range of workable temperature
  • Long life of disc as there is small gap between working pressure and rupture pressure
  • Excellent for Pressure Relief Valve Isolation

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KSRR Reverse Acting Rupture Discs

  • Reverse Dome Knife Type
  • It is used with installation on FDC standard holder
  • Reversal structure ruptured by knife blade attached upper holder while dome is inverted
  • Highly safe and resistant to corrosion
  • Favourable for counterpressure, vacuum and pulsation conditions
  • Vacuum Support is needless
  • Wide range of workable temperature
  • Long life of disc as there is small gap between working pressure and rupture pressure
Ksrr Rupture Disc Cmc

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KSRBKH Reverse Acting Rupture Discs

Ksrbkh Rupture Disc Cmc
  • Reverse Dome Buckling Knife Type
  • It is used with installation on FDC standard holder
  • It consists of Control Disc and Seal Disc
  • Ruptured while dome is sheared by Knife of Control Disc
  • Also available as KSRBK: Reverse Dome Buckling Knife Type for Flange (same as KSRBKH but used with installation on Flange without holder)
  • Standard as ASME Code Sec.VIII or ISO 4126
  • Sizes available from 1/2″ to 36″
  • Set Pressure from 0.1 to 50 kg/cm2
  • Max temperature up to 593 degC
  • No fragmentation
  • Max. Operation ratio is 90%

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