Rupture discs: function, benefits and uses 

What is a blasting cap? 

One blasting plate is a simple but highly accurate safety component that protects industrial systems against overpressure and vacuum. It consists of a thin metal diaphragm that bursts at a precisely defined pressure, thus preventing damage to equipment and processes.

Rupture discs are used in pipelines, tanks and advanced process equipment in industries such as chemical, petrochemical, energy and hygienic processes in food and pharmaceuticals. In addition, they are available in different sizes and pressure ranges, typically from 0.2 to 100 bar, making them suitable for many different applications.

How does a bursting plate work in industrial groove systems? 

The rupture disk acts as a passive safety system that ruptures at a defined differential pressure. When the pressure reaches a critical level, the rupture disk opens and relieves the system, preventing damage to equipment or leakage of hazardous media.

Since rupture discs have no moving parts, activation takes place in a few milliseconds. At the same time, operation is completely predictable and not affected by wear or mechanical tolerances. Therefore, high operational reliability and completely leak-free operation until activation is achieved.

The benefits of blasting plates 

Although in many cases safety valves are a good choice for pressure relief, there are clear situations where bursting discs are often preferred due to their specific advantages: 

Fast and precise pressure relief

With no moving parts, the rupture disk reacts immediately to critical pressure and is reliable even after long periods without pressure.  

Absolute density

During normal operation, the rupture discs are completely sealed, eliminating diffuse leakage that can occur in safety valves before they open. This makes them particularly suitable for hazardous, costly or sensitive media.  

Low maintenance

The simple design with no moving parts means that blasting caps are virtually maintenance-free. Material and manufacture determine service life, but in many applications a rupture disk can last several years without needing to be replaced. 

Cost-effective

Compared to more complex safety valves, bursting discs are often cheaper to buy, install and operate. 

Wide range of applications

Rupture discs can be used in everything from process industries and chemical handling to food production and energy systems. In addition, they work with gases, liquids and various types of mixed media.

Our range of rupture discs from Continental Disc Corporation  

Colly Flowtech offers a wide range of rupture discs from Continental Disc Corporation (CDC), customized for different industrial needs. The manufacturing process is highly precision controlled and includes several steps where the diaphragm is shaped, embossed and tested to achieve accurate burst pressure.

At the same time, CDC's products cover a wide range of applications, from static protection to high-cycle and hygienic processes. The range includes, among others:

• HPX Reverse Acting Rupture Discs
  CDC's most widely used blasting caps with reverse activation, providing long life and high cycle resistance. Tests show they can withstand over 5 million pressure and vacuum cycles at up to 95% of rated burst pressure, one of the highest cycling performances on the market.

• IntegrXHPX™ Sanitary Rupture Discs
  A new innovation from CDC that combines the strengths of HPX technology with a hygienic, sweat-proof design according to ASME BPE. IntegrXHPX is designed for cyclic processes, full vacuum and high hygiene requirements, making it particularly suitable in biotechnology, pharmaceutical and food production. 

• SANITRX HPX® and SANITRX HPX® II 
  Sanitary rupture discs designed for cleanroom environments where cleanability and sterility are important. They are also available in several sizes and pressure ranges. 

• Forward-Acting Rupture Discs
  CDC's traditional forward bursting plates that burst at a given tensile stress. These are mainly suitable for lower and stable pressure environments. Variants are available with flat or angled seats, vacuum supports and different material combinations for gases or liquids 

• Specialized Rupture Discs
  CDC's specially designed rupture discs for unique needs, such as very low pressure, vacuum protection or aggressive media.

Accessories and system components 

In addition to the rupture discs themselves, the range includes essential accessories for proper operation and monitoring: 

• Rupture Disc Holders - CDC's brackets adapted for different pipe and flange constructions to ensure correct installation 

• Burst Disc Indicators - CDC indicators that detect when a burst has occurred and send a signal to the control system. 

• Gaskets, protection and mounting components for safe installation and operation. 

How to choose the right blasting plate for your process?

Choosing the right blasting plate is not just about blasting pressure. In the configuration process, you encounter several technical concepts and have to consider a number of parameters that together determine whether the blasting plate works safely, reliably and cost-effectively in the application in question. 

The choice is therefore always based on the process requirements and operating conditions. For optimal performance, the following factors must be considered: 

Matching to process conditions: 

• Equipment design print  

• Operating pressure, temperature, media (gas, liquid, aggressive chemicals) 

• Compatibility of materials of construction 

• Does the bursting disc need to act as primary protection or in combination with a safety valve? 

Performance Tolerance 

Describes how accurately the bursting plate bursts in relation to the nominal bursting pressure. Tight tolerances are important in critical processes to ensure safe operation. 

Manufacturing Range 

Specifies the pressure range within which the blasting plate is manufactured. In applications with stable process conditions and sufficient safety margins, a wider manufacturing range may be fully sufficient and at the same time more cost-effective. 

We will help you 

As each application has its own requirements and conditions, it is often advantageous to discuss the choice of blasting plate with a specialist. This way, the right combination of design, tolerances and materials can be ensured.

Do you want to know more or discuss which rupture disc solution is best suited for your particular application? Then you are welcome to contact us at Colly Flowtech or me directly at romy.ries@colly.se and we'll be happy to tell you more. 

This text is written by Romy Ries (romy.ries@colly.se), Product Specialist / Product Specialist at Colly Flowtech.