API 650 insulated tanks impact tests
Strictly control the welding groove forming of API 650 insulated 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 650 insulated tanks weld assembly: measures must be taken to strictly control the assembly size of metal vertical tank bottom plate during assembly.
Material for the outer tank API 650 insulated tanks and for the roof that contains the vaporized liquefied gas but is primarily subjected to atmospheric temperatures may conform to one of the following:a)Table 4-1 for design metal temperatures down to –35°F (lowest 1-day mean ambient temperature of–35°F) without impact test unless they are required by Table 4-1 or by the Purchaser.b)Table R-3 for design metal temperatures down to –60°F without impact tests unless they are required by Table R-4 or by the Purchaser.
Before pressure testing, thoroughly flush the API 650 tank floating roof primary drain hose system. Supply API 650 insulated tanks blind flanges, gaskets, and bolting (for other types of blanking covers as may be required) necessary for testing.
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