管フランジ締結体の効率的なボルト締付け手順 : 有限要素解析と弾性相互作用係数法による検討

抄録

Achieving uniform preloads is an important and difficult issue, when bolting up a pipe flange connection with a number of bolts. Repeated bolt-up operations are, therefore, commonly conducted to get uniform preloads. In this study, an effective one-pass bolting up procedure to get uniform preloads is proposed by using finite element analysis with elastic interaction coefficient method being incorporated. Furthermore, some types of multi-pass bolting up procedures are also examined to avoid high initial bolt preloads that might be generated in the one-pass tightening. These procedures are applied to 20 in class 300 lb flanges specified in JPI with solid-metal flat gasket made of SS 400 and compressed asbestos sheet gasket. The validity of the procedures is substantiated by conducting bolt-up experiment using calculated initial bolt preloads.