Case Study: Calliper tool pigging study The scope We were asked by a pig tool vendor to carry out a high-level study into the eects of a calliper pig striking a check valve plate. The check valve actuator had malfunctioned and therefore could not be manually opened to allow safe passage of the pig through the valve. The pig would therefore potentially be striking the check valve plate in an unknown position, depending on the ow within the pipe. The speed of the pig would also need to be considered. Our client was concerned that the impact forces associated with the pig striking the plate would damage the calliper pig and potentially the valve mechanism. The client wanted to determine whether the g-force from the potential collision would be greater than the allowable limits for

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