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API 620 polyethylene storage tank tack weld

API 620 polyethylene storage tank tack weld

API 620 polyethylene storage tank tack weld

Heat-affected zone impact specimens shall be taken across the weld and as near the surface of the material as is practicable. The API 620 polyethylene storage tank material specimens shall be of sufficient length to locate the notch in the heat-affected zone after etching. The notch shall be cut approximately normal to the material surface to include as much heat-affected zone material as possible in the resulting fracture. Impact test specimens shall be cooled to the temperature stated in Q.22.

Under the same sealing effect, the internal floating roof tank of API 650 oil storage tank can further reduce the evaporation loss compared with the API 620 polyethylene storage tank external floating roof tank. This is due to the shielding of the fixed roof and the gas layer between the fixed roof and the internal floating plate, which has more significant heat insulation effect than the double disc floating roof of the API 620 polyethylene storage tank external floating roof tank. =====
API 650 tank has the advantages of less load on the floating plate, simple and light structure, and can save the central drainage pipe and rotating floating ladder on the API 620 polyethylene storage tank floating plate. The materials for easy construction and maintenance and sealing parts can avoid aging due to sunlight.

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