Conversion chart of drilling torque in psi (from a hydraulic rotary table) to lbf-ft.

Hi everyone,

I am working reviewing information of offset wells for a project, and I see that the surface torque readings are in psi (it is a kelly rig with a 27.5 in rotary table). 

My question is if somebody have a hydraulic pressure vs. output torque plot to convert psi to torque units (lbf-ft) for a 27.5 in rotary table.

Thanks so much for any help. 

Kind regards,

Cesar

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