Laserfiche WebLink
Tank Shell Minimum Thickness and Remaining Life Calculations Date 03/04/2023 <br />File No. Report No. Client Tank No. Temp. (deg F) Initials <br />4100 Canary 3134A Canary <br />Renewables Corp.T-631 3134A 100 Gavin Kopp <br />SHELL MINIMUM THICKNESS CALCULATIONS <br />tmin = <br />2.6(H-1)DG <br />SE <br />Where: <br />H = The height above the bottom of the course of study to the maximum liquid level height <br />of the product, in ft. For corroded or pitted areas, H = the height from the bottom of the <br />corroded or pitted area to the maximum liquid level height of the product, in ft. <br />tmin = The calculated minimum acceptable shell thickness, in inch (cannot be less than <br />0.100 inch for any course). The minimum acceptable shell thickness allowed by API-653 and <br />STI-SP001 for tank size, in inch. <br />D = Nominal diameter of tank, in ft. <br />G = Highest specific gravity of the contents (including test water if tank will, or may, be <br />tested in the future). <br />S = Maximum allowable stress, in psi. For welded tanks; use the smaller of 0.80Y of 0.429T <br />for bottom and second course or the smaller of 0.88Y or 0.472T for all other courses. For <br />riveted tanks; S = 21000 psi. For STI Tank Inspections S = 26000 psi (E = 1) <br />Y = Specified minimum yield strength of the plate, in psi; use 30000 psi if not known (N/A for <br />riveted tanks). <br />T = The smaller of the specified minimum tensile strength of the plate or 80000 psi; use <br />55000 psi if not known (N/A for riveted tanks). <br />E = Original joint efficiency for the tank. For welded tanks; use API-653, Table 2-1 ; use E = <br />1.0 when evaluating the retirement thickness in a corroded plate, when away from welds or <br />joints by at least the greater of one inch or twice the plate thickness. For riveted tanks; use <br />E = 1.0 for shell plates greater than 1.000 inch away from rivets; use the value of E from API- <br />653 Table 2-1 when within 1.000 inch of rivets. For STI Tank Inspections E = 1 where S = <br />26000 psi. <br />D (ft) 38.00 G 0.88 E 0.7 Fill Height (ft) 30.0 <br />Material Crs H (ft) H (ft) S (psi) tmin (inch) <br />Course 1 A 36M 7.62 30.00 24900 0.145 <br />Course 2 A 36M 7.62 22.38 24900 0.107 <br />Course 3 A 36M 7.62 14.75 27400 0.100