API RP 2X Reference Standards LEVEL C BLOCK (METRIC VERSION) Special Alloy The reference block for a Level C examination should contain planar reflectors compatible with the smallest rejectable flaw. One reference block containing a square (buttress) notch and one each with V-notches for 45–degree, 60–degree, and 70–degree orientations should be available for establishing scanning sensitivity for root reflectors. In addition to notches for root reflectors, the side of a 1.6mm drilled hole provides an excellent reference for internal reflectors. The response from known size implant reflectors in the operator’s test coupons should be compared with the reflections from the reference blocks to assure that the sensitivity will result in detection of the smallest flaw of interest. Level "C" examination recommended practice 2X (RP 2X). Ultrasonic examination of offshore structural fabrication and guidelines for qualifications of ultrasonic technicians. 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 Ø1.6mm Deep 38mm Block containing a square notch and one each with V-notches for 45°, 60° and 70° orientations, for establishing scanning sensitivity for root reflectors. Simulated references for reject able flaws established by the Operator's UT specialist, should be added to this block for the calibration of internal reflectors. (1)Notch – 50mm(L) X 2.38mm (W) X 1.6mm(D) (2)V-Notch (45°) - 50mm(L) X 1.12mm(D) (3)V-Notch (60°) – 50mm(L) X 1.37mm(D) (4)V-Notch (70°) – 50mm(L) X 1.49mm(D) Material : Special Alloy

API RP 2X Reference Standards LEVEL C BLOCK (METRIC VERSION) 4340 Steel The reference block for a Level C examination should contain planar reflectors compatible with the smallest rejectable flaw. One reference block containing a square (buttress) notch and one each with V-notches for 45–degree, 60–degree, and 70–degree orientations should be available for establishing scanning sensitivity for root reflectors. In addition to notches for root reflectors, the side of a 1.6mm drilled hole provides an excellent reference for internal reflectors. The response from known size implant reflectors in the operator’s test coupons should be compared with the reflections from the reference blocks to assure that the sensitivity will result in detection of the smallest flaw of interest. Level "C" examination recommended practice 2X (RP 2X). Ultrasonic examination of offshore structural fabrication and guidelines for qualifications of ultrasonic technicians. 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 Ø1.6mm Deep 38mm Block containing a square notch and one each with V-notches for 45°, 60° and 70° orientations, for establishing scanning sensitivity for root reflectors. Simulated references for reject able flaws established by the Operator's UT specialist, should be added to this block for the calibration of internal reflectors. (1)Notch – 50mm(L) X 2.38mm (W) X 1.6mm(D) (2)V-Notch (45°) - 50mm(L) X 1.12mm(D) (3)V-Notch (60°) – 50mm(L) X 1.37mm(D) (4)V-Notch (70°) – 50mm(L) X 1.49mm(D) Material : 4340 Steel

API RP 2X Reference Standards LEVEL C BLOCK (METRIC VERSION) 1018 Steel The reference block for a Level C examination should contain planar reflectors compatible with the smallest rejectable flaw. One reference block containing a square (buttress) notch and one each with V-notches for 45–degree, 60–degree, and 70–degree orientations should be available for establishing scanning sensitivity for root reflectors. In addition to notches for root reflectors, the side of a 1.6mm drilled hole provides an excellent reference for internal reflectors. The response from known size implant reflectors in the operator’s test coupons should be compared with the reflections from the reference blocks to assure that the sensitivity will result in detection of the smallest flaw of interest. Level "C" examination recommended practice 2X (RP 2X). Ultrasonic examination of offshore structural fabrication and guidelines for qualifications of ultrasonic technicians. 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 Ø1.6mm Deep 38mm Block containing a square notch and one each with V-notches for 45°, 60° and 70° orientations, for establishing scanning sensitivity for root reflectors. Simulated references for reject able flaws established by the Operator's UT specialist, should be added to this block for the calibration of internal reflectors. (1)Notch – 50mm(L) X 2.38mm (W) X 1.6mm(D) (2)V-Notch (45°) - 50mm(L) X 1.12mm(D) (3)V-Notch (60°) – 50mm(L) X 1.37mm(D) (4)V-Notch (70°) – 50mm(L) X 1.49mm(D) Material : 1018 Steel

API RP 2X Reference Standards LEVEL C BLOCK (METRIC VERSION) STAINLESS STEEL 304 The reference block for a Level C examination should contain planar reflectors compatible with the smallest rejectable flaw. One reference block containing a square (buttress) notch and one each with V-notches for 45–degree, 60–degree, and 70–degree orientations should be available for establishing scanning sensitivity for root reflectors. In addition to notches for root reflectors, the side of a 1.6mm drilled hole provides an excellent reference for internal reflectors. The response from known size implant reflectors in the operator’s test coupons should be compared with the reflections from the reference blocks to assure that the sensitivity will result in detection of the smallest flaw of interest. Level "C" examination recommended practice 2X (RP 2X). Ultrasonic examination of offshore structural fabrication and guidelines for qualifications of ultrasonic technicians. 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 Ø1.6mm Deep 38mm Block containing a square notch and one each with V-notches for 45°, 60° and 70° orientations, for establishing scanning sensitivity for root reflectors. Simulated references for reject able flaws established by the Operator's UT specialist, should be added to this block for the calibration of internal reflectors. (1)Notch – 50mm(L) X 2.38mm (W) X 1.6mm(D) (2)V-Notch (45°) - 50mm(L) X 1.12mm(D) (3)V-Notch (60°) – 50mm(L) X 1.37mm(D) (4)V-Notch (70°) – 50mm(L) X 1.49mm(D) Material : STAINLESS STEEL 304.

API RP 2X Reference Standards LEVEL C BLOCK (METRIC VERSION) STAINLESS STEEL 316 The reference block for a Level C examination should contain planar reflectors compatible with the smallest rejectable flaw. One reference block containing a square (buttress) notch and one each with V-notches for 45–degree, 60–degree, and 70–degree orientations should be available for establishing scanning sensitivity for root reflectors. In addition to notches for root reflectors, the side of a 1.6mm drilled hole provides an excellent reference for internal reflectors. The response from known size implant reflectors in the operator’s test coupons should be compared with the reflections from the reference blocks to assure that the sensitivity will result in detection of the smallest flaw of interest. Level "C" examination recommended practice 2X (RP 2X). Ultrasonic examination of offshore structural fabrication and guidelines for qualifications of ultrasonic technicians. 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 Ø1.6mm Deep 38mm Block containing a square notch and one each with V-notches for 45°, 60° and 70° orientations, for establishing scanning sensitivity for root reflectors. Simulated references for reject able flaws established by the Operator's UT specialist, should be added to this block for the calibration of internal reflectors. (1)Notch – 50mm(L) X 2.38mm (W) X 1.6mm(D) (2)V-Notch (45°) - 50mm(L) X 1.12mm(D) (3)V-Notch (60°) – 50mm(L) X 1.37mm(D) (4)V-Notch (70°) – 50mm(L) X 1.49mm(D) Material : STAINLESS STEEL 316.

API RP 2X Reference Standards LEVEL C BLOCK (METRIC VERSION) TITANIUM The reference block for a Level C examination should contain planar reflectors compatible with the smallest rejectable flaw. One reference block containing a square (buttress) notch and one each with V-notches for 45–degree, 60–degree, and 70–degree orientations should be available for establishing scanning sensitivity for root reflectors. In addition to notches for root reflectors, the side of a 1.6mm drilled hole provides an excellent reference for internal reflectors. The response from known size implant reflectors in the operator’s test coupons should be compared with the reflections from the reference blocks to assure that the sensitivity will result in detection of the smallest flaw of interest. Level "C" examination recommended practice 2X (RP 2X). Ultrasonic examination of offshore structural fabrication and guidelines for qualifications of ultrasonic technicians. 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 Ø1.6mm Deep 38mm Block containing a square notch and one each with V-notches for 45°, 60° and 70° orientations, for establishing scanning sensitivity for root reflectors. Simulated references for reject able flaws established by the Operator's UT specialist, should be added to this block for the calibration of internal reflectors. (1)Notch – 50mm(L) X 2.38mm (W) X 1.6mm(D) (2)V-Notch (45°) - 50mm(L) X 1.12mm(D) (3)V-Notch (60°) – 50mm(L) X 1.37mm(D) (4)V-Notch (70°) – 50mm(L) X 1.49mm(D) Material : TITANIUM.

API RP 2X Reference Standards LEVEL C BLOCK (METRIC VERSION) ALUMINUM 7075-T6 The reference block for a Level C examination should contain planar reflectors compatible with the smallest rejectable flaw. One reference block containing a square (buttress) notch and one each with V-notches for 45–degree, 60–degree, and 70–degree orientations should be available for establishing scanning sensitivity for root reflectors. In addition to notches for root reflectors, the side of a 1.6mm drilled hole provides an excellent reference for internal reflectors. The response from known size implant reflectors in the operator’s test coupons should be compared with the reflections from the reference blocks to assure that the sensitivity will result in detection of the smallest flaw of interest. Level "C" examination recommended practice 2X (RP 2X). Ultrasonic examination of offshore structural fabrication and guidelines for qualifications of ultrasonic technicians. 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 Ø1.6mm Deep 38mm Block containing a square notch and one each with V-notches for 45°, 60° and 70° orientations, for establishing scanning sensitivity for root reflectors. Simulated references for reject able flaws established by the Operator's UT specialist, should be added to this block for the calibration of internal reflectors. (1)Notch – 50mm(L) X 2.38mm (W) X 1.6mm(D) (2)V-Notch (45°) - 50mm(L) X 1.12mm(D) (3)V-Notch (60°) – 50mm(L) X 1.37mm(D) (4)V-Notch (70°) – 50mm(L) X 1.49mm(D) Material : ALUMINUM 7075-T6

API RP 2X Reference Standards LEVEL C BLOCK (METRIC VERSION) INCONEL 625 The reference block for a Level C examination should contain planar reflectors compatible with the smallest rejectable flaw. One reference block containing a square (buttress) notch and one each with V-notches for 45–degree, 60–degree, and 70–degree orientations should be available for establishing scanning sensitivity for root reflectors. In addition to notches for root reflectors, the side of a 1.6mm drilled hole provides an excellent reference for internal reflectors. The response from known size implant reflectors in the operator’s test coupons should be compared with the reflections from the reference blocks to assure that the sensitivity will result in detection of the smallest flaw of interest. Level "C" examination recommended practice 2X (RP 2X). Ultrasonic examination of offshore structural fabrication and guidelines for qualifications of ultrasonic technicians. 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 Ø1.6mm Deep 38mm Block containing a square notch and one each with V-notches for 45°, 60° and 70° orientations, for establishing scanning sensitivity for root reflectors. Simulated references for reject able flaws established by the Operator's UT specialist, should be added to this block for the calibration of internal reflectors. (1)Notch – 50mm(L) X 2.38mm (W) X 1.6mm(D) (2)V-Notch (45°) - 50mm(L) X 1.12mm(D) (3)V-Notch (60°) – 50mm(L) X 1.37mm(D) (4)V-Notch (70°) – 50mm(L) X 1.49mm(D) Material : INCONEL 625.

API RP 2X Reference Standards LEVEL C BLOCK (METRIC VERSION) MONAL 800 The reference block for a Level C examination should contain planar reflectors compatible with the smallest rejectable flaw. One reference block containing a square (buttress) notch and one each with V-notches for 45–degree, 60–degree, and 70–degree orientations should be available for establishing scanning sensitivity for root reflectors. In addition to notches for root reflectors, the side of a 1.6mm drilled hole provides an excellent reference for internal reflectors. The response from known size implant reflectors in the operator’s test coupons should be compared with the reflections from the reference blocks to assure that the sensitivity will result in detection of the smallest flaw of interest. Level "C" examination recommended practice 2X (RP 2X). Ultrasonic examination of offshore structural fabrication and guidelines for qualifications of ultrasonic technicians. 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 Ø1.6mm Deep 38mm Block containing a square notch and one each with V-notches for 45°, 60° and 70° orientations, for establishing scanning sensitivity for root reflectors. Simulated references for reject able flaws established by the Operator's UT specialist, should be added to this block for the calibration of internal reflectors. (1)Notch – 50mm(L) X 2.38mm (W) X 1.6mm(D) (2)V-Notch (45°) - 50mm(L) X 1.12mm(D) (3)V-Notch (60°) – 50mm(L) X 1.37mm(D) (4)V-Notch (70°) – 50mm(L) X 1.49mm(D) Material : MONAL 800.