An important lesson learned is that burst disks should be properly installed. It is selected in such a manner, that the rupture disc opens before there is any system damage. 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. 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. While this is generally the case, there are times when rupture disc performance can be adversely affected through various installation, operation and maintenance practices. When the pressure rise is so large and rapid that extremely fast-acting is required to prevent catastrophic failure. I think a rupture disc might be a decent solution but again commercial ones are cost prohibitive. The rupture element of the disc is equipped with breaking points that are normally created by means of lasers. This is usually the case with storage vessels for non-refrigerated liquefied compressible gases at ambient temperatures. In reality, the device may have activated precisely when it should have. Cost: What is the cost of an unexpected outage due to premature burst versus the cost of a replacement rupture disc during planned downtime? Since burst pressure is affected by temperature, the expected range of environmental conditions should be considered in the burst disk selection process. Data show that pressure spike reached about 16 psig. All rights reserved. Make no mistake, a sensor will report some value. Im concerned that one or more of the batteries may actually explode. Lets illustrate this with three graphs of an event first the true values, then the averages, and finally the maximum values. P. Smith, R. W. Zappe, Rupture discs, in: Valve Selection Handbook (5th Edition), Gulf Professional Publishing, Houston, 2004, pp.227-267. 2) Type of Inspection by Rupture Disc Purchaser may be changed according to equipment criticality and vendor QC evaluation at job stage. degree in mechanical engineering from the University of Missouri-Kansas City and an M.B.A. from Keller Graduate School of Management. This matches our reality, as makers of such devices are governed by a number of code requirements designed to ensure the accurate manufacture of their products. 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. Rupture discs are commonly found throughout many facilities around the world that utilize high-pressure vessels, systems, or equipment. 5 below: The flow area calculated is known as the Minimum Net Flow Area (MNFA). [3] prior to rupturing of the metallic disk. These devices prove most effective when they fail according to pre-established specifications. The burst disks were replaced with an alloy 20 nickel-chromium-molybdenum stainless steel material that is less susceptible to stress corrosion cracking than alloy 600 nickel-chromium-iron. Subsequently, corrective action was taken to increase the vent line diameter and to add bracing. 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. Lead time is also another huge consideration.
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