API RP 2X Reference Standard Block

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American Petroleum Institute Reference Standard for Level “C” Examination for Recommended Practice 2X (RP 2X), Ultrasonic Examination of Offshore Structural Fabrication and Guidelines for Qualification of Ultrasonic Technicians. Block containing a square (buttress) notch and one each with V-notches for 45°, 60°, and 70° orientations for establishing scanning sensitivity for root reflectors.