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 Providing full service geotechnical drilling and testing services for over 70 years.
   

 

 


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SPT Energy Calibration (SPTE) Equipment
 


Pitcher uses a pile driving analyzer® (PDA) system to conduct SPT energy calibration. An instrumented section of NWJ or AWJ rod measures strain and acceleration with each hammer blow. The PDA then calculates the amount of energy transferred to the rod by the force-velocity approach. Different SPT rigs and hammers are widely variable, therefore it is important to know the amount of potential energy transferred to the rod from the hammer. From this it is possible to adjust the measured N value to the normalized N60 for standard 60% energy transfer into the rods.

 
The dynamic measurements provided during SPT calibration determines the energy ratio or efficiency of the SPT system.
 
 


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Pitcher Drilling Co. (A wholly owned subsidiary of Gregg Drilling & Testing, Inc.)
 218 Demeter Street ▪ East Palo Alto ▪ California ▪ 94303 ▪ Phone: (650) 328-8910 ▪ Fax: (650) 328-3621
Email: pitcher@pitcherdrilling.com