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The Post-Tensioning Institute (PTI) offers the following certifications: 

Field Personnel Certification 

PTI offers training and certification workshops for field personnel shown to comply with requirements of the International Building Code (IBC), ACI 318 and ACI 301. The proper training and education of personnel involved in post-tensioning (PT) field operations—installers, inspectors, engineers and others—are vital to ensuring the performance, serviceability, durability and safety of PT concrete construction.  
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Plant Certification – Unbonded Tendon Plant Certification Program 

Launched in 1989, the Post-Tensioning Institute (PTI) program for the Certification of Plants Producing Unbonded Single Strand Tendons has been developed to provide independent certification of a plant's extrusion and/or fabrication process and its capability to produce standard and/or encapsulated unbonded single strand tendons. This certification program also includes the evaluation of calibration practices for jacks and gauges used for stressing single strand tendons. The program is applicable to all facilities whether fixed or mobile. 

The certification of a plant under this program indicates that the plant and the personnel are capable of producing unbonded single strand tendons in conformance with the Post-Tensioning Institute's Specification for Unbonded Single Strand Tendons. The certification program extends only to the process for extrusion and/or fabrication procedures and materials within the examined plant and is expressly not intended to cover procedures or events subsequent to shipment of tendons to the job site.  

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