API 650 ambient temperature tanks nomenclature

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Generally speaking, the duration of the "exhalation" of the API 650 ambient temperature tanks is longer than that of the "inhalation" of the API 650 ambient temperature tanks every day. There are many factors affecting the "small breathing" loss, mainly including the following points: the change of temperature difference between day and night, sunshine time of the API 650 ambient temperature tanks location, open area of the API 650 ambient temperature tanks, atmospheric pressure, filling degree of API 650 ambient temperature tanks, etc. When the API 650 ambient temperature tanks is full of gas, the space volume is small, and the "small breathing" loss is less; if the space volume is large, the loss is also large.

When as-rolled plate material complies with impact test requirements as specified here, the material need not be normalized. If, as with ASTM A516, the specification prohibits impact test without normalizing but otherwise permits as-rolled plates, the API 620 welded storage tanks material may be ordered in accordance with the above provision and identified as “MOD” for this API modification.