Shaw Group's industrial maintenance engineering team has developed an innovative, patent-pending tool to measure stem nut wear. The Stem Nut Analysis Protractor (SNAP) tool allows maintenance teams to check stem nut thread wear using a nonintrusive method allowing the valve to remain in service while analysis is conducted. It has successfully measured stem nut thread wear on more than 250 valves, identifying some stem nuts worn in excess of 80 percent.
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