API RP 2X Reference Standards LEVEL A BLOCK (INCH VERSION) The reference reflector for establishing the scanning sensitivity must be compatible with the flaw acceptance criteria and provide sufficient sensitivity to ensure detection of the smallest discontinuity of interest. For ultrasonic examination at Level A acceptance criteria, the side of a 1/16-inch (1.6-millimeter) drilled hole provides an excellent reference for use with all transducers. The thickness and length of the block containing the drilled hole should permit evaluation of reference sensitivity at the longest metal path distance anticipated in the actual examination. In addition to the side-drilled holes employed for evaluation of all discontinuities in the body of the weld, two 1/16-inch deep notches are suggested as reference standards to be used in evaluating root reflector in butt or T, K, and Y connections welded from one side only.

API RP 2X Reference Standards LEVEL A BLOCK (METRIC VERSION) The reference reflector for establishing the scanning sensitivity must be compatible with the flaw acceptance criteria and provide sufficient sensitivity to ensure detection of the smallest discontinuity of interest. For ultrasonic examination at Level A acceptance criteria, the side of a 1/16-inch (1.6-millimeter) drilled hole provides an excellent reference for use with all transducers. The thickness and length of the block containing the drilled hole should permit evaluation of reference sensitivity at the longest metal path distance anticipated in the actual examination. In addition to the side-drilled holes employed for evaluation of all discontinuities in the body of the weld, two 1/16-inch deep notches are suggested as reference standards to be used in evaluating root reflector in butt or T, K, and Y connections welded from one side only. DIMENSION : 228mm (L) X 50mm (W) X 25mm (T) Note : �T� based on the material and equipment that will be used. Block Contains : One Side Drill Hole of Dia �1.6mm Deep 38mm Two notch 50mm(L) X 2.38mm (W) X 1.6mm (D)