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VESSEL LAYOUT DRAWINGS <br />1 Record Following Data <br />a. N/A - Roof or Head and skirt lengths and type (especially head to shell joint configuration.) <br />b. N/A - Shell lines of support (Head Tangents, Braces, Jacket Closures, etc.). <br />c. X - Foundation support member dimensions and orientation. <br />d. N/A - Inside/Outside diameter. <br />e. N/A - Tank component nominal thicknesses. <br />f. N/A - Nozzle layouts, size and use. <br /> <br />UT THICKNESS READINGS <br />1 Measure and Record Vessel Part Thicknesses <br />a. X - Roof/Heads - (4) locations minimum, (1) in each quadrant and for roofs - an X pattern (6) per leg. <br />b. X - Shell - (12) locations, (3) in each quadrant for each course. <br />c. N/A - Jacket - As required (at least (4) locations). <br />d. N/A - Nozzles - (4) locations, (1) in each quadrant for 2 inches and greater, (1) location for nozzles less than 2 inches. <br />e. N/A - Floor - If ultrasonic testing equipment that is capable of scanning the tank (i.e MFE) is not practical, use <br />equipment that tests individual points. In this case, take UTT measurements of at least 15 points per each 12 inches x 12 <br />inches (0.3 meters x 0.3 meters) square area of the shell that is in contact with the ground. <br /> <br />UT RESULTS: GENERAL GUIDE <br />CAT 2 & 3 - UT Meas. less than 0.75 x Nominal Thickness - reference SP001 para 10.2.2 or 10.2.3 respectively. <br />CAT 1 - UT Meas. less than 0.50 x Nominal Thickness - reference SP001 para 10.2.4