API 650-2013 钢制焊接石油储罐 （7月 更改单）

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API 650-2013 钢制焊接石油储罐 （7月 更改单）(normalized， normalized and tempered， or quenched and tempered)， notch toughness shall be demonstrated on each
plate as heat treated when 4.2.11.2 requirements are specified. Isothermal lines of lowest one-day mean temperature
are shown in Figure 4.2.
4.2.10.4 Plate used to reinforce shell openings and insert plates shall be of the samematerial as the shell plate to
which they are attached or shall be of any appropriate material listed in Table 4.4a， Table 4.4b， Figure 4.1a， and
Figure 4.1b. Except for nozzle and manwaynecks， the material shall be of equal or greater yield and tensile strength
and shall be compatible with the adjacent shell material (see 4.2.10.1 and 5.7.2.3， Item d).
4.2.10.5 The requirements in 4.2.10.4 apply only to shell nozzles and manholes. Materials for roof nozzles and
manholes do not require special toughness.
Figure 4.1a-Minimum Permissible Design Metal Temperature for Materials Used in Tank Shells without
Impact Testing (SI)
NOTE 1 The Group II and Group V lines coincide at thicknesses less than 13 mm.
NOTE 2 The Group III and Group IIIA lines coincide at thicknesses less than 13 mm.
NOTE 3 The materials in each group are listed in Table 4.4a and Table 4.4b.
NOTE 4 Deleted.
NOTE 5 Use the Group IIA and Group VIA curves for pipe and flanges (see 4.5.4.2 and 4.5.4.3).
NOTE 6 Linear equations provided inTable 4.3a can be used to calculate Design Metal Temperature (DMT) for each API material group
and the thickness range.