rupture disc failure analysis

(Notification req'd), S: Witness, but spot check basis. Dean Miller is the manager of mechanical engineering with Fike Corp. (704 SW 10th St., Blue Springs, MO 64015; Phone: 816 655-4729; Email: dean.miller@fike.com). Additionally, most processes that need rupture discs use a blower to move the process air, either over or under pressure. Finite Element Analysis of Rupture Disc - YUMPU Two burst disks associated with two tubes on a hydrogen tube trailer failed prematurely while being filled, releasing hydrogen to the associated vent line. Copyright 2012-2013 Inspection-for-Industry.Com, Rupture Disc Mill test reports for body and trim, Rupture Disc Checking of Characteristics (Effective Pressure, Disc Diameter ), Rupture Disc Performance including set pressure test, Rupture Disc Final visual / Dimension Inspection, Rupture Disc Documentation review prior to release(Final activity of Technical Inspection). Click the button below to learn more. Environment-assisted failure of alloy C-276 burst disks in a batch supercritical water oxidation reactor, Eng. [4] The device may be re-installed if desired as long as the disc hasnt been removed from the holder. While seemingly simple, consider for a moment all the complexities that occur very quickly. We can sense, monitor and control the systems but we cant protect them very well in that way alone. Those pressure ripples work in unison to fatigue all of the structures associated with the blower, including the housing, ducts, mounting legs, and the rupture disc itself. D. Krewerth, T. Lippmann, A. Weidner, et al, Influence of non-metallic inclusions on fatigue life in the very high cycle fatigue regime, Int. Averaging often is used to filter out electrical noise. Many process materials are prone to building up and solidifying on internal surfaces. While being filled with hydrogen, a small gas cylinder was over-pressurized due to a faulty pressure transducer and failed catastrophically. Im concerned that one or more of the batteries may actually explode. The disc is fitted with a notched stainless steel tag as shown below. This rupture disc ITP is a draft and must be edited and meet your purchase order specifications. The National Fire Protection Association (NFPA) has developed a set of standards for fire protection, life safety, and building codes. The PTFE film is scored along the outer edge of the rupture disk to facilitate failure of the film upon rupturing of the disc. Heavy corrosion of the rupture disc holder can result (Figure 2). The lessons learned are 1) to post signage indicating that no water is to be sprayed on the vent stack, and 2) to install a backup pressure-relief vent stack in case the main vent stack fails. annulus to be at risk . Failure Analysis of High Pressure Rupture Discs and Effective - ASME Functions when the weakest portion of the disc exceeds its tensile strength. The sensors construction and calibration can affect its accuracy. This is usually the case with storage vessels for non-refrigerated liquefied compressible gases at ambient temperatures. It can get incredibly complex very quickly. In reality, the device may have activated precisely when it should have. The pressure rating of the burst disk should be sufficiently above the intended hydrogen system operating pressure to prevent premature failure. To that end, we partnered with Intertek Consulting Services, the leading provider of safety system assessment and verification. This means that a short-duration pressure spike that is not detectable by normal process instrumentation can and will affect the rupture disc. It sounds preposterous! Burst disks can provide valuable pressure protection and can be used to meet code requirements. [10] In fact, if you take the scenario above, you can predict the data always will appear as though a device broke early. If the fluid is not as corrosive or fouling as the original design supposed, you should consider doing away with the RD and redesign the relief valve to have contact with the process. This isnt a good solution, though, as it is born of faulty assumptions regarding the reported values. And if your processes, or surrounding environment, have changed in any way since the door Read More. A rupture disc can be used as another pressure relief device to protect a vessel of the piping system from overpressure. Moreover, interpreting these data requires properly accounting for significant interactions that can impact engine rpm; small changes in conditions can affect the reported values drastically if sample rates arent taken into account. 3) When requested in the requisition, detailed Rupture Disc ITP shall be submitted by Vendor. One key lesson learned is to consider the use of spring-style pressure-relief valves instead of burst disks. M. Schrank. Lead time is also another huge consideration. Rupture disc has been one of the most effective equipment to prevent overpressure from explosion for the pressure equipment. The objective of the rupture disc is to maintain a leak-tight seal and be a passive bystander until called upon to relieve excess pressure. In addition, you must consider the way in which the data are compiled, graphed and analyzed. Sampling involves two pieces, the rate and the resolution. This means that a short-duration pressure spike that is not detectable by normal process instrumentation can and will affect the rupture disc. In cases like this, systems typically sample in the 12 times/sec range and then may average the readings before reporting. Fatigue 84 (2016) 40-52. A burst disk (or rupture disk) is a common pressure-relief device that is designed to break at a predetermined pressure. These devices may provide a cost-effective and easier-to-install alternative where adding controls and active devices could be expensive or impossible if the system is already in place and the overload unanticipated by the original design. Since a burst disk is activated by differential pressure, back pressure against the burst disk discharge will cause it to burst at a higher pressure than intended. document.getElementById( "ak_js_2" ).setAttribute( "value", ( new Date() ).getTime() ); However, thats not always the case. Bear in mind that design engineers when configuring most systems to monitor and record processes only consider conditions deemed reasonably likely. The key lesson learned is that most premature failures of hydrogen tube trailer burst disks occur during the fill process, so other work on or around the tube trailer should be avoided during filling. Rupture Disk is basically a non-reclosing type of pressure relief safety device that protects equipment or system during overpressure situations or potentially damaging vacuum conditions. Incorrect piping and piping-support design can lead to the transfer of excessive piping loads to the rupture disc. In some of the incidents, a recommendation was made to eliminate burst disks from the system and instead rely on other relief devices (e.g., spring-activated pressure-relief devices that close after the pressure is reduced below the set relieving pressure). I am a Mechanical Engineer turned into a Piping Engineer. 6)Unless otherwise specified in REQ., theRupture Disc sampling Q'ty of " S (Spot Witness Check) " shall be as follows: 3 to 203Pcs(all if total 2 and less) , 21 to 505Pcs, 51 to 10010Pcs,101 to 20020Pcs, 201 to 30030Pcs, 301 to 50050Pcs. Since burst pressure is affected by temperature, the expected range of environmental conditions should be considered in the burst disk selection process. Company > News & Events > Engineered to Fail. Coincidently, all existing research on failure of rupture discs assumed the four-petal pattern without stating any specific reason. When a safety device activates, in our experience its useful to assume it worked as intended and then follow that logical assumption to its conclusions. Device removal: The entire device (rupture disc and holder) can be removed from the flanged connection and inspected. Relatively low pressures and static conditions will generally result in very long disc life, while cyclic conditions approaching the burst pressure will result in shorter disc life. 17(2010) 731-738. The performance of bursting at the predetermined pressure is. Rupture discs generally provide highly reliable pressure relief, so in the case of problem installations there are likely actions that can be taken to improve rupture disc performance. Operators should always be attentive to the fill operation and make sure that it takes place in a safe location. lining on the discs are discontinuous and of no practical value for corrosion After all, the opposite scenario cant occur if the safety device is properly calibrated because it would activate otherwise. Protect against rapid pressure rise caused by. For instance, remember the valve and tank discussed above. The present problem considers the tension loaded discs. is being permeated by the ozonated sulfuric acid. Weve learned to believe what our monitors tell us and to rely on the data they report. All rights reserved. Once the disc has been removed from the holder it is recommended that the disc be replaced. A mechanic working under the tube trailer was slightly injured when the loud noise from the burst disk rupture caused him to bump into the trailer several times while quickly exiting the area. However, under abnormal circumstances, say in the event of a runaway reaction or fire, a much faster rate of pressure rise may occur. Rupture discs are not standardized products. It is normally, above the working pressure during normal operation and below the maximum allowable working pressure) and corresponding temperature. One lesson learned is that a thorough hazard analysis should be performed prior to system operation to determine how to safely discharge the effluent from a burst disk failure. 6 Advantages of Pasteurization of Foods and Semi-Solids, What to Consider When Replacing an Explosion Door. Imagine a car company boldly asserting that theyve engineered their vehicles to break down. The FEP One of these standards is NFPA 37: Standard for the Installation Hi There! Domes are typically supported on the outlet side to prevent movement of the dome prior to reversal. can degrade with age or due to corrosion. In addition to the fatigue element that we just described, there are several other common rupture disc problems, such as: If the discs or supporting components are installed incorrectly, they can fail to burst.

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