Oseco’s Pro+ (precision reverse operating) disc, which is a high operating ratio bursting disc designed to protect personnel, equipment, productivity, and the environment in chemical applications, has earned a new KR rating from the American Society of Mechanical Engineers (ASME). A KR rating depends on a loss coefficient and defines minor piping system losses due to elbows, tees, fittings, valves, reducers, and other components. The rating is based upon pressure in a given system and how dependant that system is on a pressure-relief device. Pressure-relief systems have the lowest pressure drop and the highest flow when the rupture disc with the lowest KR is used. The Pro+ disc has earned the lowest currently registered KR rating for a reverse-buckling disc family, 0.29, making it one of the most effective pressure relief devices on the market and earning it a UD ASME Authorized stamp. The Pro+ disc’s 95 percent operating ratio guards against fatigue and premature disc rupture in applications with high operating-to-set ratios. Burst pressures from eight to 750 PSIG ensure consistent performance in a wide range of uses from high-to-low pressure environments, with long service life even in high cycling applications. The one-piece design is scored on the vent side, preventing product buildup.