140ft diameter API Std 650 stainless and carbon steel tank
The thickness of the API Std 650 stainless and carbon steel tank annular bottom plates shall be in accordance with Table Q-4 (for steel or aluminum, as applicable). The thicknesses shown are minimums. The ring of annual plates shall have a circular outside circumference, but it may have a regular polygonal shape inside the tank shell with the number of sides equal to the number of annular plates. These pieces shall be butt-welded in accordance with Q.7.1.1, Item b. The plates of the first shell course shall be attached to the annular bottom plates by a weld as required by API 620 oil tank 5.9.5 except when a full-penetration weld is used or required (see Q.7.1.1). Butt-welds in annular plates shall be not closer than 12 in. from any vertical weld.
Floating roofs shall comply with API standard 650, Appendix C (Attachment 01) or with the API Std 650 stainless and carbon steel tank requirements as layed (laid )down in the national Chinese specifications SH3046-92 and GBJ128-90.
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}Compared with the external floating roof API Std 650 stainless and carbon steel tank, the internal floating roof API Std 650 stainless and carbon steel tank has the advantages of protecting the floating roof from wind and rain and ensuring the quality of liquid storage under the floating roof. At the same time, because the inner floating plate is in the tank, there is no rain and snow load, so the central drainage pipe and escalator and other accessories on the floating plate can be omitted. In addition, under the same sealing conditions, the internal floating roof tank can further reduce the evaporation loss compared with the External floating roof tank.
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