Rupture discs

Producer: FDC

A rupture disc is a safety diaphragm device that ruptures when the system is over-pressurised beyond critical pressure. By rupturing, the disc relieves pressure, which ultimately helps protect equipment and human life.

The rupture disc consists of a special material, has a special shape, and has no size limitations. The rupture disc has a wide range of applications, is easy to install and adjust, and the demand for this product is constantly increasing as the cost reduction effect of its use is obvious. In addition, the rupture disc is a thermal protection against high and low temperatures, specially designed to increase the durability of equipment.

Standard: ASME Code Sec.VIII, KS B ISO 4126, API RP520, KOSHA Code, FDC
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Overview
Disc Types & Specifications
Documentation
Installation and maintenance

What is a Rupture Disc?

A rupture disc is a non-reclosing pressure relief device designed to provide instant overpressure protection in pressurized systems. Unlike mechanical valves, rupture discs are one-time-use safety elements that rupture at a defined set pressure, allowing uncontrolled pressure to be safely vented from equipment such as pressure vessels and pipelines.

FDC rupture discs prevent even 1% of accidents from occurring.

When is a Rupture Disc Required?

During sudden pressure spikes from runaway reactions or thermal expansion
When system integrity must be preserved in case safety valves may malfunction
In environments where even minimal leakage is unacceptable
When handling highly corrosive or aggressive process media
Where large relief capacity is required in an instant (e.g. polymerization)
Under severe temperature conditions — both high and low

Key Features & Functional Advantages

Customizable materials and structures — cost-effective with no size limitation
Accurate burst performance and full release of process media
Instantaneous discharge of maximum capacity
Suitable for fluids, gases, vapors, powders, and corrosive environments
Zero leakage operation
Prolongs the service life of safety valves when installed upstream
Allows outlet piping inspection while in operation
Reduces maintenance costs and extends overhaul intervals

Disc & Holder Materials

FDC rupture discs can be manufactured using a wide range of materials to meet process and corrosion requirements:

Stainless Steel (304SS, 316SS, 317SS)
Carbon Steel, Duplex, Aluminum
Nickel, Inconel, Monel, Hastelloy, Titanium, Tantalium
Graphite and Teflon (PTFE)

Applicable International Standards

ASME Sec. VIII Div.1
ISO 6718, ISO 4126-2 to 4126-6
API RP 520
KOSHA Safety Certification

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Disc types

Korean-made rupture discs have proven to be reliable and technologically precise components in overpressure protection systems. They ensure stable performance across a wide range of temperatures and pressures, meet international standards, and are suitable for use with gases, vapors, and liquids.

To simplify the selection process, a comparative table is provided below. It summarizes the key specifications of all models — from disc type to allowable pressure and temperature ranges. This tool enables a fast and well-informed choice of the most suitable solution for specific operating conditions.

Comparative Table of Rupture Disc Types

Model	Size	Set. Pressure	Temperature	Process Media	Max. Operating Ratio
Reverse Type
KSRR	1/2″ ~ 48″	0.3 ~ 150kg/cm²	Max. 593℃	Gas, Vapor	90%
KSRRK	1/2″ ~ 24″	0.35 ~ 30kg/cm²	-200℃ ~ 600℃	Gas, Vapor, Liquid	90%
KSRSR	1/2″ ~ 24″	5 ~ 60kg/cm²	Max. 593℃	Gas, Vapor, Liquid	90%
KSRBKH	1/2″ ~ 36″	0.1 ~ 50kg/cm²	Max. 593℃	Gas, Vapor, Liquid	90%
Forward Type
KSRST	1/2″ ~ 48″	15 ~ 1500kg/cm²	Max. 593℃	Gas, Vapor, Liquid	70%
KSRSF	1/2″ ~ 18″	5 ~ 700kg/cm²	Max. 593℃	Gas, Vapor, Liquid	80%
KSRCT	1/2″ ~ 40″	15 ~ 1500kg/cm²	–	Gas, Vapor, Liquid	70%
Composite Flat Type
KSRO	1/2″ ~ 72″	0.05 ~ 35kg/cm²	Max. 482℃	Gas, Vapor, Liquid	50%
Composite Dome Type
KSRC	3/4″ ~ 52″	0.1 ~ 560kg/cm²	Max. 482℃	Gas, Vapor, Liquid	80%
KSRRCH	1/2″ ~ 48″	0.05 ~ 50kg/cm²	–	Gas, Vapor, Liquid	80%
Double Acting Type
KSROD	1/2″ ~ 48″	0.05 ~ 35kg/cm²	Max. 482℃	Gas, Vapor, Liquid	50%
KSRRLD	2″ ~ 10″	0.01 ~ 0.15kg/cm²	Max. 270℃	Gas, Vapor	90%
KSRRCHD	1/2″ ~ 48″	0.05 ~ 50kg/cm²	–	Gas, Vapor, Liquid	80%
Ultra Low Pressure Type
KSROL	3″ ~ 32″	0.01 ~ 0.15kg/cm²	Max. 270℃	Gas, Vapor, Liquid	50%
KSRRL	2″ ~ 10″	0.01 ~ 0.15kg/cm²	Max. 270℃	Gas, Vapor	50%
Graphite Disc
KSRGD	1–1/2″ ~ 24″	0.017 ~ 0.49kg/cm²	-179 ~ 221℃	Gas, Vapor, Liquid	90%
KSRGI	1/2″ ~ 24″	0.017 ~ above 70kg/cm²	-179 ~ 371℃	Gas, Vapor, Liquid	90%
KSRGM	1/2″ ~ 24″	0.017 ~ 10kg/cm²	-179 ~ 371℃	Gas, Vapor, Liquid	90%

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More information about rupture discs

Reverse Type (KSRR, KSRRK, KSRSR, KSRBKH)

Reverse-type rupture discs are designed with an inverted dome that bursts under compression. This construction is especially effective in installations exposed to vacuum, pulsation, or back pressure. These models provide high durability and stable performance across a broad pressure and temperature range.

No vacuum support required — stable in vacuum and pulsating conditions
Small gap between operating and burst pressure ensures long disc life
Suitable for gas, vapor, and liquid with excellent rupture accuracy

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Forward Type (KSRST, KSRSF, KSRCT)

Forward-type rupture discs operate under tensile stress and are ideal for high and ultra-high pressure environments. Their sloped seat design enhances reliability and extends service life, even under challenging process conditions with pulsation or counterpressure.

Designed for high and ultra-high pressures (up to 1500 kg/cm²)
Tension-sloped seat structure ensures precise rupture and long-term stability
Corrosion-resistant and compatible with gas, vapor, and liquid processes

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Composite Flat Type (KSRO series)

Composite flat-type discs are best suited for low-pressure applications with liquids or vapors. Installed without holders, they offer a compact solution and are available with different seal disc materials to match corrosion resistance needs.

Optimized for low-pressure service (0.05–35 kg/cm²)
Reliable performance due to precision slit-processed top disc
Strong chemical resistance based on seal material selection

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Composite Dome Type (KSRC, KSRRCH)

These rupture discs combine a dome shape with composite construction for medium to high pressure ranges. They offer stable performance in applications involving steam, vapors, or liquids, especially where pressure fluctuations or vacuum conditions occur.

Withstands vacuum, pulsation, and back pressure
High burst accuracy with slit-machined dome structure
Flexible sealing material options ensure corrosion resistance

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Double-Acting Type (KSROD, KSRRLD, KSRRCHD)

Double-acting discs are designed to relieve pressure in both flow directions, making them ideal for processes requiring bidirectional safety. Composite construction provides reliability at low pressures and compatibility with aggressive media.

Enables two different burst pressures in opposite directions
Composite structure ensures reliable performance at low pressure
Corrosion-resistant disc materials extend service life

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Ultra-Low Pressure Type (KSROL, KSRRL)

These discs are specialized for ultra-low pressure applications, with burst settings as low as 0.01 kg/cm². Ideal for delicate systems such as low-pressure tanks or venting lines, they combine precision with corrosion resistance.

Calibrated for ultra-low set pressures from 100 mmAq
Excellent repeatability and rupture precision at minimal pressure
Reliable chemical compatibility for gases, vapors, and liquids

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Graphite Disc (KSRGD, KSRGI, KSRGM)

Graphite rupture discs are built from solid graphite blocks impregnated with resin, offering outstanding chemical durability in highly corrosive environments. They are flange-mounted and suitable for a wide temperature and pressure range.

Exceptional corrosion resistance from monolithic graphite structure
Easy installation between flanges, no holder required
Double-acting and high-pressure variants available for flexible applications

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Documentation

FDC Company Profile

FDC rupture disc catalogue

Installation

The installation of the rupture disc is very simple. The rupture disc consists of a disc and a holder and is installed by inserting the disc between the top and bottom of this holder.

Secure the flange bolts and nuts by tightening them symmetrically in the order shown in the video.

When the pressure exceeds the required values, аn accident can occur at any time. If the pressure exceeds the set point, the rupture disc ruptures to relieve the pressure built up inside the unit and protect the equipment.

Each rupture disc is a disposable product and must be replaced after rupture.

Advantages of working with ATEX.CENTER

The customer will have no problems with the supply of components and service. ATEX.CENTER is an official distributor of the leading European distributor of explosion protection equipment RSBP spol. s r.o. Our specialists periodically confirm their qualification in his commission of expertise.