A516 Gr 55 plates API 650 special tank

Generally speaking, the duration of the "exhalation" of the API 650 special tank is longer than that of the "inhalation" of the API 650 special tank 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 special tank location, open area of the API 650 special tank, atmospheric pressure, filling degree of API 650 special tank, etc. When the API 650 special tank 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.

API 650 special tank basic components are those that contain the vaporized liquefied gas from the stored refrigerated liquid but primarily operate at atmospheric temperatures because of insulation system design and natural ambient heating. These components shall comply with the basic rules of this standard. Examples of such components are the outer wall and roofs of double-wall tanks and roof components above an internally insulated suspended deck. The API 620 tank materials requirements are based on the storage of refrigerated products at the design metal temperature.

The interior of API 650 storage tanks to be internally lined or coated must have all edges rounded to a minimum of 3 mm radius. Internal welds must be completely seal welded, ground smooth, and free from API 650 special tank surface porosity, pockets, and high spots. Remove weld spatter. Vendor as specified on API 650 storage tanks drawing must perform additional surface preparation.