API 650 floating-roof tanks non-armored hose-type drains

Heat-affected zone impact specimens shall be taken across the weld and as near the surface of the material as is practicable. The API 650 floating-roof tanks 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.

All edges of the inner wall of the API 650 petroleum storage tank to be lined or coated must be rounded and flat to a minimum radius of 3mm. The API 650 floating-roof tanks internal welding seam must be completely sealed welding, with a smooth surface and no air holes, air pockets and local protrusions. Remove welding spatter. As specified in API 650 petroleum storage tank design drawings, the seller must perform additional surface treatment.

When encountering heavy rain or continuous heavy rainfall, the safe operation of API 650 floating-roof tanks will be affected. For example: the API 650 floating-roof tanks is submerged, the oil unloading valve and the flame arrester valve are broken by water and the oil tank leaks. The oil tank area must do emergency work to prevent rainstorm to ensure the safety of the oil tank. Here are some safety protection measures for API 650 floating-roof tanks in heavy rain.