CSA G40.21 plates API Std 650 carbon and low-alloy steel tanks
storage tanks API Std 650 carbon and low-alloy steel tanks designed in accordance with the rules and guidelines of API 650 are called API 650 storage tanks. API 650 is a control rule for welded storage tanks that work normally in the normal pressure range.
Usually, the wind load in the API Std 650 carbon and low-alloy steel tanks construction area should be considered before the tank design and construction. The wind load in the API Std 650 carbon and low-alloy steel tanks construction area has an impact on the stability and economy of the API Std 650 carbon and low-alloy steel tanks. In the area with large wind load, it is safe to design the tank as "squat". When calculating the wind force, the influence of the thickness of the insulation layer of the API Std 650 carbon and low-alloy steel tanks, the shape of the ladder, the platform, the pipeline and the top cover must be considered.
The hardness of the welds contacting these environments, including the heat-affected zones, shall be considered. The weld metal and adjacent heat-affected zone often contain a zone of hardness that is well in excess of a value of 22 on the Rockwell C scale and could be expected to be more susceptible to cracking than would unwelded metal. Any hardness criteria shall be a matter of agreement between the Purchaser and the API Std 650 carbon and low-alloy steel tanks manufacturer and shall be based on an evaluation of the expected hydrogen sulfide concentration in the product, the possibility of moisture being present on the inside metal surface, and the strength and hardness characteristics of base metal and weld metal.
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