Total Target Penetration (TTP)
Total Target Penetration (TTP) : Total target penetration, TTP, is the distance from the exterior steel face of the core target to the probe depth. The probe depth shall be determined by the maximum depth from the exterior steel face to the deepest point that can be probed with a 0.1-in. OD tube using 50 psi air pressure and a probe force not exceeding 10 pounds. (RP 43)
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