Frequently Asked Questions

A Rupture or Bursting disc is a pressure differential membrane that  breaks to relieve pressure at a predetermined pressure and corresponding temperature. It is non-reclosing and is replaced upon rupture. It is very accurate and very reliable. It does not require any external mechanical actuation device to operate, only a rise in pressure to its rated set point. It is often likened to a fuse in an electrical system. The safety device of last resort that works when all other mechanical devices have failed.

We advise everyone start with the Rupture Disc Questionnaire. The basis for selecting a rupture disc begins with an over pressurization hazard being generally determined by a process engineer. Details on the process will be needed to properly select a product that works reliably, so often engineers or technicians familiar with the operations specify them. In other cases, it may be necessary to provide a pressure relief device “just in case” on a pressurized piece of equipment.

Contact Fike. There are many disc types and not all are suited to all process applications. Some basic applications can use older technology whilst other disc types will be longer lasting and able to handle the arduous duty of pressure cycling and a very high operating ratio allowing plant operators to be even more efficient. Fike can help you select the most suitable product.

Yes, Fike can do your disc sizing based on KD method. See TB8102.

Due to the varying degree of process media composition, temperature and resulting material compatibility, Fike is unable to provide final recommendations for the materials of construction for your specific application.

The use of Reverse Acting type RDs may offer specific user advantages especially when looking at severe pressure cycling during operation and low burst pressure settings. The determination of the most suitable RD type for your application is essential to ensure best service expectations. Contact Fike in case where any such questions arise.

Advanced technology now allows manufactures such as Fike to produce rupture discs with a Zero manufacturing range. For accuracy and simplicity, Zero manufacturing range is recommended. With Zero manufacturing range, if you order a 100 psig rupture disc, the tag plate and paperwork all state 100 psig.

The tag plate contains a specific lot# and can be provided to Fike for a duplication of the specifications. Please provide this upon request for quote.

Instructions are included with each shipment. If they are not found, please contact Fike with the lot# off the tag plate to obtain a PDF copy emailed to you. Alternatively, you can review the product page of your rupture disc.

Fike rupture discs must use Fike disc holders. Some of our different rupture discs are compatible with the same disc holder. All holder information requirements can be found on the rupture disc product pages and often on the rupture disc holder page.

Once the rupture disc is damaged or burst, it cannot be re-used. More information on this topic of replacement period can be found in the service life article.

No. Each rupture disc model is explicitly intended to perform as expected in a bespoke holder design of the same manufacturer. Some rupture discs “may fit” into a like holder of another manufacturer, but proper performance cannot be assured. Consult the manufacturer if there is any doubt on the proper holder for your rupture disc make and model.

Each rupture disc is produced in a “lot.” Each lot of rupture discs has samples destructively burst tested to directly measure the burst pressure. This sample plan is based on the standards/codes as a minimum criteria.

There are many advantages gained by isolating a relief valve with a rupture disc, such as eliminating leakage, allowing a higher operating pressure etc. however the disc type must be selected so that it does not fragment etc. Please review Best Practices for RDs and PRVs (TB8105) for a list of the typical considerations prior to making a purchase decision.

A Safety Relief Valve or Pressure Relief Valve opens and closes to relieve pressure at a set point however it is mechanical and can fail to operate if it is damaged, plugged with product, corroded or poorly maintained. A Rupture Disc is non reclosing but much more accurate and allows for the working pressure to be very close to the relieving pressure without any leakage, it also acts as a barrier to prevent corrosive product damaging the valve, it is much less expensive especially in exotic, corrosion resistant materials than a valve. For this reason, it is common and good practice to use a Rupture Disc in combination with a Safety Relief Valve to get the best features of both.

There are two basic types of Rupture disc; Forward Acting, where the pressure is on the concave side of the disc, and Reverse Buckling, where the pressure is on the convex. Forward acting discs can be either solid metal or a composite of metal with a plastic seal but they all work by stretching beyond their yield strength and then bursting. This does mean that they can suffer from fatigue if the operating pressure is too close to the set pressure. Reverse Buckling discs are solid metal and the dome of the disc faces the process, the shape of the disc structure is what creates their strength and typically they are able to withstand pressure cycles, vacuum and a high operating ratio without fatigue.

This is the ratio between the maximum operating pressure and the set pressure at which the disc will burst. Modern discs like Fike RD520 AXIUS®, RD500 ATLAS® Reverse Buckling discs can operate at up to 95% of the set pressure without damaging the disc. Where EN-ISO-4126-2 requirements apply, the ratio between the maximum operating pressure and the minimum specified burst pressure is used.

We are here to help you through a simple process that will evaluate your facilities types of dusts, their potential combustibility, and products that you can use to mitigate risks associated with the combustion potential. Reach out to a Fike representative to schedule a visit from an expert to start the process. And explore our educational materials, such as this Explosion Solution Selection Guide, and the Testing Table in the meantime.

Maybe. The dust collector vent may have been sized for a given set of combustible dust conditions, that must be reviewed to be true as part of your ongoing responsibilities to satisfy the local regulations such as indicated in NFPA.  As well, the dust collector may require flameless venting if it has been placed indoors, or a vent discharge duct. Additionally, the inlet line and return airlines need to be isolated. A full review needs to occur to ensure the hazard conditions are satisfied.

Explosion protection regulations change from country to country relative to NFPA, ATEX, pressurized equipment requirements, electrical wiring/component requirements, even the equations used by the standards to determine the sizing and selection of hardware.  Furthermore, explosion protection equipment needs to be maintained by factory trained technicians, and consideration should be made under the consultation of the manufacturer that all these items can be satisfied prior to making a purchase decision.

This worksheet questionnaire asks the necessary questions to guide the explosion protection specialist through the evaluation to provide a quote.

Explosion Vent Selection Guide

It is possible to have both types of systems on a vessel. Your Fike contact will help you through these systems.

Yes, all Fike explosion protection hardware can be installed both indoors and outdoors. And in the cases of some venting, a weather cover may be used.

Visit our Explosion Protection Services section to learn more about this.

Contact your distributor, they’ll arrange for a refill and it’s usually a couple days turn around. If there is an issue or you have immediate concerns that need additional support, contact your regional sales manager.

We include a list of scheduled events on our Events and Training page. Please be aware that the schedule may change, check back often to see the most up-to-date events.

Fike Corporation is dedicated to supporting your customer experience throughout the entire process. Please contact us directly for assistance identifying a distributor who can support your needs

In an effort to streamline customer support, your Fike representative will now help you directly identify the expert near you to assist. Contact us today to get the process started.

If your item comes with a data sheet, you can find the part number on it. If you have any issues finding the sheet or your part number, please contact your Fike representative for assistance.

For all products, Fike authorized distributors can access our product manuals through the myFike. For detection/control products, anyone with access can scan the QR code within the panel’s door to access these documents.

Contact your distributor, they’ll arrange for a refill and it’s usually a couple days turn around. If there is an issue or you have immediate concerns that need additional support, contact your regional sales manager.

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