Double Rupture Disc Assembly prevents contamination.

Available in materials ranging from stainless steel to Hastelloy and Duplex, Double-Disc Assembly comprises primary and secondary bursting discs that are both reverse-acting, both forward-acting, or combination, plus pressure gauge or switch to monitor space between discs. In event of chemical attack causing pinholing of primary disc, secondary disc prevents pollution of environment, while intermediate pressure sensor alerts process managers and maintenance teams of need to replace disc.

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[source: http://news.thomasnet.com/fullstory/Double-Rupture-Disc-Assembly-prevents-contamination-20002319]

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