Rupture Discs – Bursting Discs, Holders and Disc Sensors

FDC – Rupture Discs – Bursting Discs, Holders, Disc Sensors, and Accessories

These rupture discs are produced by FDC, who have over 25 years of experience in this highly competitive international market. Their products can be specified to product standards including KS B ISO 4126, KOSHA, ASME Code Section VIII, API RP520, and the ISO-9001:2008 quality system.

FDC is making continuous efforts in new product development and quality improvement of existing products to protect your plant and personnel from hazards including explosion.

Their main products are used as pressure safety devices in applications including unpressurised storage containers, various pressurised containers, industrial plants, reactors, and ships, and the performance and quality of the products have been proven by FDC’s participation in the Defence Industry.

Reverse Type (Compression Loaded / Reverse Buckling / Reverse Acting) – Rupture 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 gs service , while a circular scored design would be suitable for either gas or liquid or dual phase service conditions.

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 withing the bolt circle of comapnion flanges. FDC also make a patented reverse buckling disc design that inserts within the flanges without the need for a holder.

KSRRK

Design:

· 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:
· KSRRKF: Reverse Dome Shear Type for Ferrule (Tri-Clamp Connection) (same as KSRRK but used with installation on Ferrule / TriClamp Connection without holder)

KSRSR

Design:
· Reverse Dome Scored Type
· It is used with installation on FDC standard holder
· Carved structure ruptured while inverted along with Scored Line processed precisely

KSRR

Design:
· 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

KSRBKH

Design:
· 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:
· KSRBK: Reverse Dome Buckling Knife Type for Flange (same as KSRBKH but used with installation on Flange without holder)

Forward Type (Forward Acting – Tension Loaded) Bursting Discs

This type of disc is installed in a system where the normal operating pressure is on the concave or cupped side of the pre-bulged crown. These discs can be generally operated reliably from vacuum to 70 or 80% of their rated burst pressure depending on the desn. Designs range from Prebulged, Composite or scored designs. Duties are for liquid or gas service depending on the design. Holders can be insert or pretorque type with either flat or angular seted designs. FDC makes some disc designs also suitable to be installed between flanges without the need for holders.

KSRSF

Design:
· Forward Dome Scored Type
· It is used with installation on FDC standard holder
· Carved structure with Scored Damage processed precisely ruptured by tension

KSRST

Design:
· Forward Dome Tension Flat Seat Type
· It is used with installation on FDC standard holder
· Structure with disc ruptured by tension pressure

KSRCT

Design:
· Forward Dome Tension Sloped Seat Type
· It is used with installation on FDC standard holder
· Structure that the Disc is ruptured by tension owing to the pressure, Sloped Type Disc Seat structure
· It consists of Top disc, Support disc and Guide ring

Forward Type – Forward Acing/ Tension loaded – Composite Dome Type Bursting Discs – Rupture Discs

This disc consists of a slotted metal top section and a teflon or metal seal. It is used for low pressures and is designed to minimise fragmentation. It is suitable for use in gal , liquid or dual phase fluids. Vacuum supports are available when there are vacuum conditions. The burst pressure is controlled by the combination of the slotted top section and the seal. The discs can be operated frm full vacuum (with Vacuum support) to 80% of its rated burst pressure. FDC designs are avialble to fit with insert or pretorque holders, flat or angular seats, or directly between flanges without holders or to suit ferrule / triclamp connections.

KSRC

Design:
· Composite Dome Sloped Seat Type
· It is used with installation on FDC standard holder
· Composite/Dome structure ruptured by slit processed on Top disc
· It consists of Top disc, Seal disc and Vacuum disc

KSRRCH

Design:
· Composite Dome Flat Seat Type
· It is used with installation on FDC standard holder
· Composite/Dome structure ruptured by slit processed on Top disc
· It consists of Top disc, Seal disc and Vacuum disc

Also available:
· KSRRC: Composite Dome Flat Seat Type for Flange (same as KSRRCH but used with installation on Flange without holder)
· KSRRCF: Composite Dome Flat Seat Type for Ferrule (same as KSRBKH but used with installation on Ferrule Connection without holder)

Composite Flat Type Bursting Discs – Rupture Discs

KSRO

Design:
· Composite Flat Type for Flange
· Used with installation on Flange without holder
· Composite/Flat structure ruptured by slit processed on Top disc
· It consists of Top disc, Seal disc and Vacuum disc

Also available:
· KSROH: Composite Flat Type (same as KSRO but used with installation on FDC standard holder)
· KSROF: Composite Flat Type for Ferrule (same as KSRO but used with installation on Ferrule Connection without holder)

Double Acting Type Bursting Discs – Rupture Discs

KSROD

Design:
· Composite Flat Double Acting Type for Flange
· Used with installation on Flange without holder
· Composite/Flat structure ruptured by slit processed on Top disc
· It consists of Top disc, Seal disc and Vacuum disc

Also available:
· KSROHD: Composite Flat Double Acting Type (same as KSROD but used with installation on FDC standard holder)
· KSROF: Composite Flat Double Acting Type for Ferrule (same as KSROD but used with installation on Ferrule Connection without holder)

KSRRLD

Design:
· Reverse Dome Knife Double Acting Type – LP
· It is used with installation on FDC standard holder
· Reversal structure ruptured by knife blade attached upper holder while dome is inverted
· It consists of Support disc, Disc seal and Vacuum support

KSRRCHD

Design:
· Composite Dome Flat Seat Double Acting Type
· It is used with installation on FDC standard holder
· Composite/Dome structure ruptured by slit processed on Top disc
· It consists of Top disc, Seal disc and Vacuum disc

Also available:
· KSRRCFD: Composite Dome Flat Seat Double Acting Type for Ferrule (same as KSRRCHD but used with installation on Ferrule Connection without holder)

Ultra Low Pressure Type Bursting Discs – Rupture Discs

KSRRL

Design:
· Reverse Dome Knife Type – LP
· It is used with installation on FDC standard holder
· Reversal structure ruptured by knife blade attached upper holder while dome is inverted
· It consists of Top disc, Seal disc and Vacuum disc

KSROL

Design:
· Composite Flat type for Flange – LP
· Used with installation on Flange without holder
· Composite/Flat structure ruptured by slit processed on Top disc
· It consists of Top disc, Setting Disc, Seal disc and Vacuum disc

Fitting Connection Type

VCR

VCR

KSRRKV

KSRSFV

KSRSTV

KSRRCV

UNION

KSRRKU

KSRSFU

KSRSTU

KSRRCU

PLUG

KSRRKP

KSRSFP

KSRSTP

KSRRCP

Graphite Bursting Discs – Rupture Discs

KSRGM (mono block)

· Made from a single piece of graphite which is impregnated with phenolic resin
· Easy to install and maintain
· Install directly between standard flange without holders
· Excellent corrosion resistance
· Favourable for low and intermediate burst ratings
· Counterboard side of the disc contacts the process media
· In case of vacuum condition, vacuum supports are available for ratings below 25 psig
· Insulated Units are supplied armoured with required insulation and gaskets for service above 221℃ to 371℃
· Armour is required for temperatures above 170℃

KSRGI (Inverted)

· Made from a single piece of graphite which is impregnated with phenolic resin
· Easy to install and maintain
· Install directly between standard flange without holders
· Excellent corrosion resistance
· Favourable for higher burst ratings
· Flat surface of the disc contacts the process media
· Armour is required for temperatures above 170℃
· TFE liner is available to extend corrosion resistance

KSRGD (double acting)

· Made from a single piece of graphite which is impregnated with phenolic resin
· Easy to install and maintain
· Install directly between standard flange without holders
· Excellent corrosion resistance
· Setting two different pressures in the opposite directions (Double Acting Type)
· Optional liner is available to extend corrosion resistance
· Armour is required for temperatures above 170℃

Accessories for Bursting Discs – Rupture Discs

Pressure Gauge

Pressure Gauge

Pressure Switch

Pressure Switch

Excess Flow Valve

A kind of check valve to keep the atmospheric condition between Rupture Disc and safety valve of outlet.

Nipple, Tee, Plug, Reducer

Fitting for the installation of pressure gauges, pressure switches, or excess flow valves.

Stud Bolt & Nut

Tightening bolt & nut for In/Out Flange.

Eye Bolt

It is installed on holders of 8″ nominal diameter or more, on the upper holder, for the ease of handling the heavier weight associated with larger holder sizes.

Gasket

Sealing for the In/Out flange mating surfaces.

J-Hook

J-shaped hooks installed at lower holder

Jack Screw

It acquires an installation space for the Rupture Disc by welding on In/Out Flange (for maintenance).

Burst Sensor

Sensing disc for checking whether Rupture Disc is ruptured or not. Provided with Shield cable (Type – Integrated or Separated)

Junction Box

Terminal box for connecting shield cable of sensor disc.

Rain Hood

It protects a rupture disc against foreign objects or rain inflow by installation at the side of the rupture disc exposed to the atmosphere.

Heat Shield

It functions to reduce the high temperature of 300~400℃ by installed heat insulator such as Cerak Wool or Aerogel in front of the Rupture Disc.

MARSTON – Rupture Discs – Bursting Discs, Holders and Disc Sensors

A comprehensive selection of bursting discs / rupture disks and explosion vents for safe and instantaneous pressure and vacuum relief in an ever increasing range of critical applications.

With over 50 years experience, MARSTON is a leading manufacturer of pressure relief and explosion protection devices, such as bursting discs (rupture discs) and explosion vent panels. MARSTON products provide safe and instantaneous pressure relief in a diverse range of critical applications in the offshore oil & gas + onshore oil & gas, chemical and food processing industries, as well as venting systems and pharmaceutical technology.

MARSTON also offers a variety of technical resources including high temperature testing, helium leak testing, fluid flow and metallurgical laboratories, pressure cycling and radiographic inspection. All MARSTON products carry a wide range of approvals and comply with the most stringent international standards and customer specifications including ATEX and ASME “UD” certification.

Marston is based in Manchester, United Kingdom and is part of Safety Systems UK Limited. CMC Technologies exclusively represents Marston in Australia and New Zealand as well as other brands such as AMAL, MARVAC, and CASH which are all manufactured in the same Factory in Manchester.

The simplest of all discs, usually a single domed metallic foil which will probably fragment upon disc rupture. This pre-bulged rupture disc has a flat seated design and is non- torque sensitive. It can be used on liquid or gas service and can be operated reliably in static pressure operations to 70 of it minimum burst pressure. It can resist vacuum for certain burst pressures or resist full vacuum or back pressure with the assistance of a vacuum support.

A single metallic foil which has grooved lines of weakness and is designed to be non-fragmenting.
It will normally withstand vacuum conditions without the aid of a vacuum support. It is also known as a scored rupture disc. The disc can be used in liquid or gas service and opens cleanly along the scored lines. This flat seated design is non torque sensitive. It can be operated to 80% of its minimum burst pressure in static conditions.

A forward acting disc which has two membranes. The CS disc is named afer its construction – Composite Slotted.
A load-bearing slotted metallic outer membrane and a weaker, usually fluoropolymer, seal membrane giving a non-fragmenting design. The burst pressure is controlled by the closeness of the slits in the outer membrane and the combination with the seal’s thickness. This disc is widely used for lower bursting pressures. It is flat seated and non torque sensitive. It can be operated reliably to 80% of its minimum burst pressure in static conditions,

Usually a single foil disc which has the pressure applied to its convex side. The dome inverts and is completely expelled from its holder and stopped by an arrestor. This proven design is unique to Marston and is Marston’s first design reverse buckling discs and is still available on the market.. This disc has superior performance attributes than tension loaded discs. It can be operated from full vacuum to 95% of its burst pressure in pressure cyclic conditions,

Usually a single foil disc which has the pressure applied to its convex side. The dome inverts and opens along a peripheral groove. It is designed to be retained by its hinge portion. This scored reverse buckling disc opens cleanly along its circular score lines. It has superior performance compared to tension loaded discs. It can be operated from full vacuum to 95% of its minimum burst pressure. It is suitable for liquid (see LRB)  or gas service (RBH)  and ideal for relief valve isolation. It has a flat seated design and is non torque sensitive. Its performance is guaranteed with its interaction with its designed holder – mostly insert type due to its non torque sensitivity.

Usually a single foil disc which has the pressure applied to its convex side. The dome inverts and opens along a peripheral groove. It is designed to be retained by its hinge portion. This scored reverse buckling disc opens cleanly along its circular score lines. It has superior performance compared to tension loaded discs. It can be operated from full vacuum to 95% of its minimum burst pressure. It is suitable for liquid (see LRB)  or gas service (RBH)  and ideal for relief valve isolation. It has a flat seated design and is non torque sensitive. Its performance is guaranteed with its interaction with its designed holder – mostly insert type due to its non torque sensitivity.

This disc has two membranes. A load-bearing slotted metallic membrane and a weaker, usually fluoropolymer, seal membrane giving a non-fragmenting design suitable for low bursting pressures.

A single metallic foil which has the pressure applied to its convex side. The dome inverts and opens along radial grooved lines. It is designed to retain ll parts and withstand full vacuum without the aid of a vacuum support.

The RBH range of reverse buckling discs has been adapted for use in the well-proven hygienic clamp fittings, widely adopted by the pharmaceutical, biotechnology, brewing, dairy and similar industries; anywhere that high
levels of hygiene are essential.

The discs are provided with a profiled seal that conforms exactly to the pipe ferrule flanges ensuring that there are no crevices for product deposits. The non-fragmenting disc design is such that there will be minimal restriction to vent flow in the event of the disc rupturing due to an excessive pressure.

A flat graphite disc, impregnated with a high quality resin, giving good corrosion resistance and low bursting pressures. The unique GR arrangement is designed to protect the disc from the effects of flange bolt loading. This disc fragments on rupture. This disc is thin in construction and designed to operate with its interaction with its holder. Vacuum resistance is available with a special metal dial in the holder. The disc should be operated to 80% of its minimum burst pressure in static conditions and up 50% in cyclic conditions to maximise its service life.

A flat graphite disc, impregnated with a high quality resin, giving good corrosion resistance and low bursting pressures. This disc does not require a dedicated holder, and fragments on rupture. Vacuum resistance is possible with an additional dial (bar type) or dial type support on its underside. This disc shall be operated to 80 of its minimum burst pressure in static conditions or 50% in cyclic conditions to maximise its service life.

A unique disc manufactured from pure graphite powder. It is suitable for high temperatures and extremely low bursting pressures. This disc will fragment on rupture.