UL 58:2018 pdf download.Steel Underground Tanks for Flammable and Combustible Liquids.
15 Compartment Tanks
15.1 Bulkheads of a compartment tank shall be constructed so that any leakage through joints shall not result In leakage from one compartment to another. See Figure 15.1 for acceptable bulkhead conslructions.
15.2 A single bulkhead of a compartment tank. illustrated in No. 101 and No. 102 of Figure 15.1, shall be constructed of one piece of material and shall be flat or dished. The height of a dished bulkhead shall not be less than that specihed in Table 11.1.
15.3 A bulkhead of a double bulkhead tank, illustrated in No. 100 of Figure 15.1, shall be constructed of not more than two pieces foc diameters of 48 inches (1.22 m) or less, three peces for diameters ranging from 49 to 96 inches (1.24 to 2.44 m), and four pieces for diameters ranging from 97 to 144 inches (2.46 to 3.66 m). When two o more pieces are used, joints shall comply with the requirements lot shell goints in Figure 10,1, No. 1.
15.4 The minimum thickness of metal employed for a bulkhead shall comply with Table 7.1
15.5 A flanged flat bikhead of a compartment tank more than 72 inches (1.83 m) in diameler shall be made of steel not less than 0.302 inch (7.67 mm) thick or it shall be braced as illustrated in Figure 15.2 and shall comply with Table 15.1.
15.6 A flanged flat bulkhead 72 inches (1.83 m) or less in diameter does not require bracing.
15.7 Surface bracing for unftanged flat bulkheads shall be as illustrated in No. 102 of Figure 15.1 and shall comply with Table 15.2.
15.1 Bulkheads of a compartment tank shall be constructed so that any leakage through joints shall not result In leakage from one compartment to another. See Figure 15.1 for acceptable bulkhead conslructions.
15.2 A single bulkhead of a compartment tank. illustrated in No. 101 and No. 102 of Figure 15.1, shall be constructed of one piece of material and shall be flat or dished. The height of a dished bulkhead shall not be less than that specihed in Table 11.1.
15.3 A bulkhead of a double bulkhead tank, illustrated in No. 100 of Figure 15.1, shall be constructed of not more than two pieces foc diameters of 48 inches (1.22 m) or less, three peces for diameters ranging from 49 to 96 inches (1.24 to 2.44 m), and four pieces for diameters ranging from 97 to 144 inches (2.46 to 3.66 m). When two o more pieces are used, joints shall comply with the requirements lot shell goints in Figure 10,1, No. 1.
15.4 The minimum thickness of metal employed for a bulkhead shall comply with Table 7.1
15.5 A flanged flat bikhead of a compartment tank more than 72 inches (1.83 m) in diameler shall be made of steel not less than 0.302 inch (7.67 mm) thick or it shall be braced as illustrated in Figure 15.2 and shall comply with Table 15.1.
15.6 A flanged flat bulkhead 72 inches (1.83 m) or less in diameter does not require bracing.
15.7 Surface bracing for unftanged flat bulkheads shall be as illustrated in No. 102 of Figure 15.1 and shall comply with Table 15.2.
