[1E06-17] Refinery maintenance(2)

1:45 PM - 2:00 PM JST(4:45 AM - 5:00 AM UTC)Japanese

[1E09] A study on the prediction of residual clamping force and estimation of loosening lifetime in bolted joints for equipment maintenance, and its visualization

○Soichi Hareyama¹, Shinya Yamamoto² (1. Tokyo Metropolitan University, 2. TACST Co.)

Keywords:

Equipment・Maintenance,Loosening in bolted joints,Prediction of residual clamping force and estimation of loosening lifetime

In petrochemical plants, trables of gas leaks caused by loosening of bolted joints have been reported. The loosening of bolted joints is observed as a decrease in clamping force, which is likely caused by either a depression-type phenomenon or fluctuations in external forces acting on the bolts. A strong linear relationship between the behavior of clamping force and elapsed time is obtained on logarithmic coordinates. This paper presents the results of a study on a method for predicting the remaining clamping force and evaluating the remaining loosening lifetime of bolted joints based on this relationship.