ASTM A36 plates API Std 650 self anchored flatbottom tanks
Strictly control the welding groove forming of API Std 650 self anchored flatbottom tanks: in order to ensure the geometric dimension of assembly and good welding of welding seam, before hoisting and laying, the edge of all metal vertical storage tank plate shall be polished by grinder, and the flatness of plate shall be ensured according to the design requirements. Strictly control the size of API Std 650 self anchored flatbottom tanks weld assembly: measures must be taken to strictly control the assembly size of metal vertical tank bottom plate during assembly.
Standard Hydrostatic and Pneumatic TestsAfter erection is completed and stress relieving, radiographic examinations, or other similar operations, as may be required, are performed, each tank shall satisfactorily pass a series of hydrostatic and pneumatic tests as prescribed in 7.18.2 through 7.18.6. Whenever a solution film is specified in this section to be applied to welding, linseed oil or another equivalent material for disclosing air leakage may be substituted. In freezing weather, linseed oil or a similarly suitable material shall be used.The attachment welding around all openings and their reinforcements in the walls of the API 620 tank shall be examined by the magnetic-particle method both inside and outside the tank API Std 650 self anchored flatbottom tanks. When the underside of a tank bottom rests directly on the tank grade (and is not accessible after erection), such examination of welding on the underside of the bottom and subsequent air testing may be omitted.
Floating roofs shall comply with API standard 650, Appendix C (Attachment 01) or with the API Std 650 self anchored flatbottom tanks requirements as layed (laid )down in the national Chinese specifications SH3046-92 and GBJ128-90.
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