Copyright 2011 – Magnum Piering, Inc. Capacity to Torque Ratio Howard A. Perko, Ph.D., P.E. Magnum Geo-Solutions, LLC Copyright 2011 – Magnum Piering, Inc., All Rights reserved. May be distributed and printed by express written permission of the author only. MAGNUM Informational Bulletin ISO-MHP3-11A

Copyright 2011 – Magnum Piering, Inc. Capacity to Torque Ratios for Magnum Products Example Capacity Calculation Measurement of Torque Torque Calibration Conclusions Contact Information Outline

Copyright 2011 – Magnum Piering, Inc. Capacity-to-Torque Ratios Magnums Product Catalog Contains Suggested Capacity:Torque Ratios. From Magnum 2011 Product Catalog

Copyright 2011 – Magnum Piering, Inc. Capacity Calculation For 3 Magnum Helix Foundations, 8 x Torque = Ultimate Capacity Example: 8 x 10,000 ft-lbs = 80,000 lbs RatioTorqueUltimate Capacity (Note: Allowable Capacity = 80,000/F.S. 2 = 40,000 lbs)

Copyright 2011 – Magnum Piering, Inc. Torque Measurement Devices

Copyright 2011 – Magnum Piering, Inc. Visual Torque Indications Using physical indications like bolt hole elongation and shaft twist can help determine if torque measurement devices are correctly calibrated.

Copyright 2011 – Magnum Piering, Inc. Torque Calibration Calibrate Torque at lest annually after maintenance when questionable use redundant torque measurement methods to identify lack of calibration

Copyright 2011 – Magnum Piering, Inc. Conclusion Use Capacity:Torque Ratios to Verify Helical Pile Capacity in the Field during all Installations

Copyright 2011 – Magnum Piering, Inc. Contact Information Magnum Piering, Inc PIER (7437) 6082 Schumacher Park Drive West Chester, OH 45069