Bolt Tension Method Evaluation Bolted junctions are ubiquitous in applications such as oil and gas pipelines, and making sure such fasteners remain adequately tightened is critical to ensuring a leak-proof seal at pipe ?anges. Manual checking with traditional tools such as torque wrenches can be time-consuming and expensive, while conventional ultrasound methods essentially rely on a calibration having been performed for each bolt, which is often not practical for ?eld use. In this project Acentech was asked to use its expertise in signal processing, vibration, wave propagation and ultrasonics to help a manufacturer of bolting equipment develop a device to infer bolt tension in the ?eld, without the need for a prior calibration step. Several possible methods were researched, including ?ang

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