A333 grade 1 pipe API 650 special tank
The foundation design of the API 650 special tank should meet the requirements of foundation stability and deformation, that is, the API 650 special tank foundation should not be crushed and the uneven settlement value of the foundation should be within the allowable range. The uneven settlement of the storage tank foundation should be specified in the design process of the safe allowable range, because excessive uneven settlement will reduce the safety of the API 650 special tank and cause distortion and deformation of the tank wall and bottom plate.
Inspection of Butt-welds in PipingButt-welds in piping and in API 650 special tank pipe fittings within the limitations of 1.3.2 (including the annular space of double- wall tanks) shall be inspected in conformance with API 620 oil tank standard Q.7.7.2 through Q.7.7.6. Longitudinal welded joints in piping that contains liquid shall be completely radiographed except for manufactured pipe welded without filler metal, 12 in. or less in diameter, which is tested hydrostatically or by eddy current to ASTM requirements.
API 650 tanks in which liquid fluids are stored and designed to withstand atmospheric pressure operation, less than 18 kPa, or internal pressures not exceeding the weight of the API 650 special tank roof, with temperatures no higher than 93, 3 C are included in the scope of this design code.
