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in in., including corrosion allowance, tn = nominal minimum thickness of the nozzle neck, in in., including corrosion allowance, tp = nominal thickness of the reinforcing pad, in in., including corrosion allowance if the pad is exposed to corrosion, c = corrosion allowance, in in., tmin = the smaller of 3/4 in. or the thickness less the corrosion allowance of either of the parts joined by a fillet weld or groove weld, t1 or t2 = a value not less than the smaller of 1/4 in. or 0.7tmin; the sum t1 + t2 shall not be less than 1.25tmin, t3 = the smaller of 1/4 in. or 0.7(tn - c).
(Inside corner welds may be further limited by a lesser length of projection of the nozzle wall beyond the inside face of the tank wall.) t4 = a value not less than 0.5tmin, t5 = a value not less than 0.7tmin, th = nominal head thickness, in in. Notes: 1) The weld dimensions indicated in this figure are predicated on the assumption that no corrosion is anticipated on the outside of the tank. If outside corrosion gost download is expected, the outside weld dimensions shall be increased accordingly.
2) Exposed edges shown as rounded may be finished by light grinding to at yahoo.com least a 1/8 in. radius or chamfered at 45 degrees to at least a 5/32 in. width. a For 3-in. pipe size and smaller, see exemptions in 5.16.9.2. 5-44 API STANDARD 620 5.16.5 Reinforcement Required 5.16.5.1 The total cross-sectional area of the reinforcement provided at any section through an opening and within the limits of the area of reinforcement as defined in 5.16.3 shall be not less than the value computed by the following equation: Ar = (d + 2c)(t - c)(E��) where Ar = area, in square in., to be provided in the reinforcement of the section under consideration, d = inside clear dimension, in in., across the opening at the section under consideration before deducting the applicable corrosion allowance (see 5.14.1), c = corrosion allowance, in in., for the part under consideration, t = thickness, in in., required by 5.10 for the particular area of the tank wall in which the opening is located for resisting the unit forces that act in a direction perpendicular to the
