Forged Pipe Flange MT & PT Exam Flaw Specimen (Inch Version) CS Forged Pipe Flange MT and PT Exam Flaw Specimen Forged Pipe Flange Magnetic Particle and Liquid Penetrant Exam Flawed Specimens. Geometry: 6"OD x 0.75"T. Flaws: 3, randomly placed Standard Tolerance: +/-0.150" (4mm). Documentation: NDT Verification Reports,C of C, CAD Drawings and Test Sheets. Material: Carbon Steel. Customized Calibration Test Block and Flaw Specimen also available.