Gage No.

Inches mm Inches mm 12 0.108 2.74 0.097 2.46 14 0.079 2.01 0.070 1.78 3/8 inch 0.375 9.53 0.365 9.27 5/16 inch 0.312 7.92 0.302 7.67 5. Shell Seams 1/4 inch 0.250 6.35 0.240 6.10 5.1 A shell seam of a tank shall be one of the forms shown by Figure 5.1. 7 0.179 4.55 0.167 4.24 9 0.150 3.81 0.138 3.51 5.2 Shell seam No. 4 shall not be used on tanks 10 0.135 3.43 0.123 3.12 larger than 96 inches (2.44 m) in diameter. 12 0.105 2.67 0.093 2.36 14 0.075 1.91 0.067 1.70 5.3 Shell seam No. 7 shall not be used on tanks larger than 65 inches (1.65 m) in diameter. FIGURE 5.1 SHELL SEAMS C C D CF C B CF NO. I-ALL DIAM. NO. 2-ALL DIAM. NO. 3-ALL DIAM. 3.E MIN. D E C CF CF T 1/2" MIN. NO.4-MAX. DIAM. 96" NO.5-ALL DIAM. NO. 6-ALL DIAM. 5/32" (4.0mm) C Min. Separation D CF t-2 I-1/2" Min. T (38.1 mm) NO. 7-MAX, DIAM. 65" TA48-4 NO.8-ALL DIAM. B - Overlap - 1/2 inch (12.7 mm) minimum. E - 1/2 inch (12.7 mm) minimum diameter lock weld, not over 12 C - Continuous welds. inches (305 mm) apart. CF - All lap welds shall be continuous full fillet welds. T - D - Overlap - 1/2 inch (12.7 mm) minimum for diameters 48 inches Tack weld 1 inch (25 mm) spots, not over 12 inches (305 mm) apart. (1.2 m) or less;3/4 inch (19.1 mm) minimum for diameters over 48 inches (1.2 ml. t - Thickness of backup bar to be same as shell thickness. Figure 6.1 revised November 28, 1977 *Replaces page 6 dated October 29, 1976 COPYRIGHT © 1976, 1977 UNDERWRITERS LABORATORIES INC. OCTOBER 29, 1976 STEEL UNDERGROUND TANK FOR FLAMMABLE AND OMBUSTIBLE LIQUIDS - UL 58 7 6. Heads and Head Joints 6.2 A head of a tank may be flat, dished, or conical. 6.1 A head of a tank shall be fabricated of not more than two pieces for diameters of 48 inches 6.3 A head of a tank shall be attached to the (1.22 m) or less; three pieces for diameters of from shell by one of the joints shown by Figure 6.1. 49 to 96 inches (1.24 to 2.44 m); and four pieces for diameters of from 97 to 144 inches (2.46 to 6.4 An unflanged flathead of a tank shall be 3.66 m). When two or more pieces are used, seams braced in accordance with Figure 6.2, No. 1 or 2, shall be one of the forms shown by Figure 5.1, and the head and shell shall be made of not less observing the diameter limits as noted. than No. 7 gage (see Table 4.1) material. FIGURE 6.1 HEADS AND HEAD JOINTS FOR ALL DIAMETER TANKS B C C CF C F NO.10 NO.11 NO. 12 8 C C CF C NO. 13 NO.14 NO.15 F C B B C B CF F F F NO. 16 NO. 17 NO. 18 t t CF t CF CF F F J NO. I9 NO.20 NO.21 B B 1 CF CF CF T K CF F F TA48-2 NO.22 NO.23 NO.24 K - Joint No. 22 - Heads require bracing. (see No. 1 and 2 of Figure B - Overlap - 1/2 inch (12.7 mm) minimum. 6.2). Minimum Gage No. 7, (0.179 inch) (4.55 mm) nominal. C - Continuous welds. T - Tack weld 1 inch (25 mm) spots, not over 12 inches (305 mm) apart. CF - Shall be continuous full fillet welds. t - Minimum, 1 X shell thickness. F - Not less than five times head thickness - minimum 1/2 inch (12.7 mm). Heads may be fiat, dished, or cone. Height of cone heads - not less than one-tweifth J - Joint No. 21 - Minimum Gage No. 7, (0.179 inch) (4.55 mm) diameter. nominal. Height of dished heads shall conform to Table 6.1. 8 STEEL UNDERGROUND TAN OR FLAMMABLE AND COMBUSTIBLE LIQUIDS JL 58 OCTOBER 29, 1976 FIGURE 6.2 BRACING FOR UNFLANGED FLAT HEADS AND BULKHEADS C-Weld. S-From center, approximately 1/4 of U diameter. V is U-Weld three sides W each foot. C V-Bracing. W-Minimum length of foot. W NO. 1 Not greater than 45° See Table 6.2 V T-Tack welds, not X X over 12 inches (305 mm) T T apart. X X V-Bracing. T X-Not over 2 inches (51 mm) X X from shell. NO. 2 See Table 6.3 BRACING FOR FLANGED FLAT BULKHEADS T-Tack welds, not over 12 inches (305 mm) apart. T X-Not over 2 inches (51 mm) from shell. X X Y-Bracing (locate 6 inches (150 mm) below center of head). NO. 3 TA 44-1 See Table 6.4 TABLE 6.1 TP-5 DISHED HEADS - MINIMUM HEIGHT Diameter Minimum Dish Diameter Minimum Dish Inches m Inches mm Inches m Inches mm Up to 60 Up to 1.52 1-1/2 38 97-108 2.46-2.74 4-1/2 114 61-72 1.55-1.83 2 51 109-120 2.77-3.05 5-1/2 140 73-84 1.85-2.13 2-1/2 64 121-132 3.07-3.35 I 7 178 85-96 2.16-2.44 3-1/2 89 133-144 3.38-3.66 8 203 OCTOBER 29, 1976 STEEL UNDERGROUND TANK FOR FLAMMABLE AND COMBUSTIBLE LIQUIDS - UL 58 9 NOTE - The use of standard S.I. (metric) sizes and weights of angles, channels, and I-beams as substitutes for the U.S.A. structural units specified in Tables 6.2, 6.3, and 6.4 shall be based on those sizes and weights having an equal or greater section modulus (S). TABLE 6.2 STRUT BRACING FOR UNFLANGED FLAT HEADS AND BULKHEADSᵃ TP-2 Diameter Head Channels Angles wa Section Modulus(s) Section Medulus(s) Inches m Size, Inches In.³ Size, Inches In.³ Inches mm Up to - 60 Up to 1.52 1 by 3/8 by 1/8 0.048ᵇ 1 by 1 by 1/8 0.031 1 25.0 61-72 1.55-1.83 1 by 3/8 by 1/8 0.048ᵇ 1-1/4 by 1-1/4 by 1/8 0.049 1-1/4 32.0 73-84 1.85-2.13 1 by 1/2 by 1/8 0.063b 1-1/2 by 1-1/2 by 1/8 0.072 1-1/2 38.0 85-96 2.16-2.44 1 by 1/2 by 1/8 0.063° 1-3/4 by 1-3/4 by 3/16 0.140 1-3/4 44.0 97-108 2.46-2.74 1-1/2 by 3/4 by 1/8 0.147ᵇ 2 by 2 by 3/16 0.190 2 51.0 109-120 2.77-3.05 3 inches - 4.1 pounds 1.15 2 by 2 by 1/4 0.250 2 51.0 121-132 3.07-3.35 3 inches - 4.1 pounds 1.1° 2-1/2 by 2-1/2 by 5/16 0.480 2-1/2 64.0 133-144 3.38-3.66 3 inches - 4.1 pounds 1.1° 2-1/2 by 2-1/2 by 5/16 0.480 2-1/2 64.0 a See Figure 6.2, No. 1. b Flange of channel welded to head or bulkhead and shell. TABLE 6.3 SURFACE BRACING FOR UNFLANGED FLAT HEADS AND BULKHEADSᵃ TP-3 Diameter Head Channels Angles Section Modulus(s) Min. Section Modulusis) Inches m Size In.3 Sizes, Inches In.3 Up to 60 Up to 1.52 3 inches - 4.1 pounds 1.1ᵇ 2 by 2 by 3/8 or 0.35 2-1/2 by 2-1/2 by 1/4 61-72 1.55-1.83 3 inches - 4.1 pounds 1.1b 3 by 3 by 7/16 or 0.95 3-1/2 by 3-1/2 by 5/16 73-84 1.85-2.13 4 inches - 5.4 pounds 1.9b 3-1/2 by 3-1/2 by 1/2 or 1.50 4 by 4 by 3/8 85-96 2.16-2.44 5 inches - 6.7 pounds 3.0b 4 by 4 by 1/2 or 2.00ᵇ 5 by 3-1/2 by 3/8 97-108 2.46-2.74 5 inches - 6.7 pounds 3.0ᵇ 4 by 4 by 3/4 or 2.80b 6 by 4 by 3/8 109-120 2.77-3.05 6 inches - 8.2 pounds 4.3b 5 by 5 by 5/8 or 3.90b 6 by 4 by 1/2 121-132 3.07-3.35 7 inches - 9.8 pounds 6.0ᵇ 5 by 5 by 3/4 or 4.50b 6 by 4 by 9/16 133-144 3.38-3.66 7 inches - 9.8 pounds 6.0ᵇ 5 by 5 by 3/4 or 4.50ᵇ 6 by 4 by 9/16 a See Figure 6.2, No. 2. b Short leg of angle or flange of channel welded to head or bulkhead. 10 STEEL UNDERGROUND TAR OR FLAMMABLE AND COMBUSTIBLE LIQUID UL 58 OCTOBER 29, 1976 TABLE 6.4 SURFACE BRACING FOR FLANGED FLAT BULKHEADSᵃ TP-4 Diameter Head I-Beams Channels Section Modulus(s) Section Modulus(s) Inches m Size In.³ Size In.3 72-84 1.83-2.13 3 inches - 5.7 pounds 1.7b 3 inches 4.1 pounds 1.1b 85-96 2.16-2.44 3 inches - 5.7 pounds 1.7ᵇ 4 inches - 5.4 pounds 1.9b 97-108 2.46-2.74 4 inches - 7.7 pounds 3.0ᵇ 5 inches - 6.7 pounds 3.0ᵇ 109-120 2.77-3.05 5 inches - 10 pounds 4.8b 5 inches - 6.7 pounds 3.0b 121-132 3.07-3.35 5 inches - 10 pounds 4.8b 6 inches - 8.2 pounds 4.3ᵇ 133-144 3.38-3.66 5 inches 10 pounds 4.8b 6 inches - 8.2 pounds 4.3b a See Figure 6.2, No. 3. b Flange of 1-beam or channel welded to bulkhead. 6.5 A flanged flathead of a tank is not required 7.3 A bulkhead of a double bulkhead tank, to be braced. shown by No. 100, Figure 7.1, shall be fabricated of not more than two pieces for diameters of 48 6.6 A conical head of a tank shall have a height inches (1.22 m) or less; three pieces for diameters of not less than one-twelfth the diameter of the of from 49 to 96 inches (1.24 to 2.44 m); and four tank. pieces for diameters of from 97 to 144 inches (2.46 to 3.66 m). When two or more pieces are 6.7 A dished head shall have a dish height of used, seams shall be one of the forms shown by not less than that specified in Table 6.1. Figure 5.1, observing the diameter limits as noted. 7.4 The thickness of metal employed for a bulkhead depends upon its diameter and shall be not less than that specified in Table 3.1. 7. Compartment Tanks 7.5 An unflanged flat bulkhead of a compartment tank shall be braced in accordance with 7.1 Bulkheads of compartment tanks shall be of Figure 6.2, No. 1 or 2, and shall be made of not such construction that any leakage through joints less than No. 7 gage (see Table 4.1) material. will be directed to the outside of the tank rather than from one compartment to another. See Figure 7.6 A flanged flat bulkhead of a compartment 7.1 for acceptable bulkhead constructions. tank more than 72 inches (1.83m) in diameter shall be made of not less than 5/16-inch (see Table 4.1) 7.2 A single bulkhead of a compartment tank, thick material or it shall be braced in accordance shown by Nos. 101 and 102, Figure 7.1, shall be with Figure 6.2, No. 3. fabricated of one piece of material and may be flat or dished. The height of a dished bulkhead shall be 7.7 A flanged flat bulkhead 72 inches (1.83 m) not less than that specified in Table 6.1. or less in diameter does not require bracing. OCTOBER 29, 1976's STEEL UNDERGROUND TANK FOR FLAMMABLE AND COMBUSTIBLE LIQUIDS - UL 58 11 FIGURE 7.1 BULKHEADS FOR COMPARTMENT TANKS A NO. 100 FLANGE FOR TESTING C B A D Straight Flange Tangent line on head NO. IOI E TA44-3 NO. 102 t MIN. A - Bracing as per Table 6.4 if diameter exceeds 72 inches (1.8 ml B - 1/2 inch (12.7 mm) C - 3/4 inch (19.1 mm) D - - 1-1/4 inch (31.8 mm) E - Bracing as per Table 6.2 or 6.3 12 STEEL UNDERGROUND TAN OR FLAMMABLE AND COMBUSTIBLE LIQUIDS JL 58 OCTOBER 29, 1976 8. Pipe Connections 8.3 Pipe-connecting fittings shall be of steel of a good welding quality. The minimum length of 8.1 Pipe connections shall be supplied by thread shall conform to the values specified by welding to the tank, standard threaded pipe Table 8.1. couplings, substantial threaded flanges, standard half pipe nipples, or by bolted and gasketed 8.4 Pressed-steel pipe-connecting fittings shall flanged connections welded to pipe nipples which, be installed with the hub section on the inside of in turn, are welded to the tank. the tank only and of the form shown by No. 62, Figure 8.1. The thickness of the flange section shall 8.2 Conventional types of pipe connections are be as specified in Table 8.1 with tolerances as illustrated by Figure 8.1. permitted by Table 4.1. FIGURE 8.1 PIPE CONNECTIONS NO.60 NO.61 NO.62 NO.63 NO. 65 NO. 64 NO. 66 NO. 67 TA45-1 All welds shall be full fillet welds. No. 60 - Half pipe coupling. No. 61 - Half pipe coupling. No. 62 - Pressed steel, hub inside tank only. No. 63 - Forged steel, hub inside tank. No. 64 - Full pipe coupling. No. 65 - Forged steel, with pilot. No. 66 - Forged steel, without pilot. No. 67 - Standard pipe nipple and welding flange. OCTOBER 29, 1976 STEEL UNDERGROUND TANK FOR FLAMMABLE AND COMBUSTIBLE LIQUIDS - UL 58 13 TABLE 8.1 PIPE CONNECTIONS TP-6 Thickness of Flange Section of Pressed-Steel Pipe Sizea Nominal Minimum Length of Thread Fittings Inches Inches mm Gage No. Nominal, Inches mm 1/8 1/4 6.4 1/4 3/8 9.5 3/8 3/8 9.5 1/2 1/2 12.7 3/4 5/8 15.9 10 0.135 3.4 1 5/8 15.9 9 0.150 3.8 1-1/4 11/16 17.5 9 0.150 3.8 1-1/2 3/4 19.1 9 0.150 3.8 2 3/4 19.1 9 0.150 3.8 2-1/2 1 25.4 7 0.179 4.6 3 1 25.4 7 0.179 4.6 3-1/2 1 25.4 7 0.179 4.6 4 1-1/8 28.6 7 0.179 4.6 5 1-3/16 30.2 6 1-1/4 31.7 8 1-3/8 34.9 a American Standard, ANSI 836.10. 8.5 Half pipe nipples shall be welded to the 8.10 Each tank shall have a pipe connection of a tank as shown by No. 67, Figure 8.1. size not less than that specified in Table 8.2 for attachment of a vent pipe. 8.6 Except as indicated in paragraphs 8.7 and 8.8, all openings in a tank shall be located in the 8.11 An opening for connection of a vent pipe top, parallel with the longitudinal axis of the tank. shall not be located in a manhole cover. 8.7 If the application of a tank is such that pipe-connecting openings in the top are required to be grouped, the openings may be located off center of the longitudinal axis under the conditions TABLE 8.2 SIZE OF VENT-PIPE FITTING specified in paragraph 8.8. TP-7 8.8 No opening in the shell of a tank shall be Capacity of Tank, U.S. Gallons dm³ Pipe Sizeᵃ Nominal located more than 12 inches (305 mm) from the Inches longitudinal center line of the top, and the upper end of the pipe coupling or other pipe-connecting 0 to 500 Up to 1,895 1-1/4 fitting welded to the tank shall terminate above the 501 to 3,000 1,900 to 11,355 1-1/2 top of the shell. 3,001 to 10,000 11,360 to 37,855 2 10,001 to 20,000 37,860 to 75,710 2-1/2 20,001 to 35,000 75,715 to 132,490 3 8.9 All openings in a tank shall be closed with 35,001 to 50,000 132,495 to 189,270 4 wooden plugs, metal covers, or their equivalent, to protect the threads and exclude foreign matter a American Standard, ANSI B36.10. while in storage or in transit. 14 STEEL UNDERGROUND TA OR FLAMMABLE AND COMBUSTIBLE LIQUID UL 58 OCTOBER 29, 1976 9. Manholes 9.2 A manhole-cover joint shall be provided with a gasket of material determined to be suitable 9.1 A manhole, if provided in a tank, shall be for the liquid to be stored and shall have a located above the highest normal liquid level and thickness of not less than 1/8 inch (3.2 mm). shall be of the bolted-cover type as shown by Figure 9.1. FIGURE 9.1 CONVENTIONAL MANHOLES Q P R CF t NO.90 Q t P R CF NO.91 Q t P R CF NO.92 Q t P ALTERNATE COLLARS C CF CF R CF CF NO. 93 NO.94 NO.95 TA48-3 CF - Continuous full fillet weld. P - Gasket material, 1/8 inch (3.2 mm) thick minimum - ring or face gasket. Q - Minimum, 1/2 inch (12.7 mm) bolts spaced 4 inch (102 mm) centers maximum. R - Minimum, 2 inches (51 mm) for tanks 6 feet (1.8 m) in diameter or larger. t - Not less than No. 7 gage (0.179 inch) (4.55 mm) nominal. OCTOBER 29; 1976 STE UNDERGROUND TANK FOR FLAMMABLE AN OMBUSTIBLE LIQUIDS - UL 58 15 10. Heating Coils and Hot Wells B. By completely filling the tank with water and applying an additional 5 psig (34.5 kPa) 10.1 A heating coil or hot well, if provided as a pressure. When using this method, the tank is to part of a tank assembly and if handling a fluid be placed in the position in which it will be other than that stored in the tank, such as steam or installed. hot water, shall have no joints in that portion located within the tank unless such joints are 11.2 If leaks are noted during the test, the tank continuously welded or brazed. shall be made tight by welding and retested. Defects in welds shall be repaired by chipping or 10.2 Inlet and outlet connections of a heating melting out from one or both sides of the joint, as coil or a hot well shall be located above the highest required, and rewelding. normal liquid level. A continuous weld shall be made where a connection pierces the shell of the 11.3 Each compartment of compartment tanks tank or a manhole cover. shall be separately tested for leakage. MANUFACTURING AND PRODUCTION TESTS MARKING 11. General 12. General 11.1 Each tank, before painting, shall be tested by the manufacturer and proved tight against 12.1 Each tank shall be marked with the name of leakage in accordance with one of the following the manufacturer or a distinctive marking, which methods: may be in code, by which it may be identified as the product of a particular manufacturer. A. By applying internal air pressure and using soapsuds, linseed oil, or equivalent material for 12.2 If a manufacturer produces tanks at more the detection of leaks. The test pressure is to be than one factory, each tank shall have a distinctive not less than 5 nor more than 7 pounds per marking to identify it as the product of a square inch gauge (psig) (34.5-48.3 kPa). particular factory. 16 STEEL UNDERGROUND TAN OR FLAMMABLE AND COMBUSTIBLE LIQUIDS UL 58 OGTOBER 29, 1976 APPENDIX A TABLE I TABLE Il TD-3 GALLON CAPACITY PER FOOT OF LENGTH LITER CAPACITY PER METER TD-4 OF LENGTH Dia- U.S. Dia- U.S. Dia- U.S. meter Gallons meter Gallons meter Gallons in 1-Foot in 1-Foot in 1-Foot Diameter in mm Liters (dm3) 1-meter Length Inches Length Inches Length Inches Length 600 282.7 24 23.50 65 172.38 105 449.82 700 384.8 25 25.50 66 177.72 800 502.7 106 458.30 26 67 900 636.2 27.58 183.15 107 467.70 1000 785.4 27 29.74 68 188.66 108 475.89 1100 958.2 28 31.99 69 194.25 109 485.00 1200 1131.0 29 34.31 70 199.92 110 493.70 1300 1327.3 30 36.72 71 205.67 111 502.70 1400 1539.4 31 39.21 72 211.51 112 511.90 1500 1767.2 32 41.78 73 217.42 113 521.40 1600 2010.6 33 44.43 74 223.42 114 530.24 1700 2269.8 34 47.16 75 229.50 115 540.00 1800 2544.7 35 49.98 76 235.66 116 549.50 1900 2835.3 36 52.88 77 241.90 117 558.51 2000 3141.6 37 55.86 78 248.23 118 568.00 2100 3463.6 38 58.92 79 254.63 119 577.80 2200 3801.3 39 62.06 80 261.12 120 587.52 2300 4154.8 40 65.28 81 267.69 121 597.70 2400 4523.9 41 68.58 82 274.34 122 607.27 2500 4908.8 42 71.97 83 281.07 123 617.26 2600 5309.3 43 75.44 84 287.88 124 627.00 2700 5725.6 44 78.99 85 294.78 125 638.20 2800 6157.5 45 82.62 86 301.76 126 647.74 2900 6605.2 46 86.33 87 308.81 127 658.60 3000 7068.6 47 90.13 88 315.95 128 668.47 3100 7547.7 48 94.00 89 323.18 129 678.95 3200 8042.5 49 97.96 90 330.48 130 690.30 3300 8553.0 50 102.00 91 131 700.17 3400 9079.2 337.86 51 92 3500 9621.2 106.12 345.33 132 710.90 3600 10178.8 52 110.32 93 352.88 133 721.71 3700 10752.1 53 114.61 94 360.51 134 732.60 3800 11341.2 54 118.97 95 368.22 135 743.58 55 123.42 96 376.01 136 754.64 56 127.95 97 383.89 137 765.78 57 132.56 98 391.84 138 776.99 58 137.25 99 399.88 139 788.30 59 142.02 100 408.00 140 799.68 60 146.88 101 416.00 141 811.14 61 151.82 102 424.48 142 822.69 62 156.83 103 433.10 143 834.32 63 161.93 104 441.80 144 846.03 64 167.12