Forged Pipe Flange MT and PT Exam Flaw Specimen (Inch Version) Carbon Steel 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.