API Std 650 flat-bottom tanks roof flotation test

In cylindrical tank walls, the longitudinal weld joints in adjacent shell courses, including compression ring welds, shall be offset from each other a minimum distance of 12 in. The butt-weld around the periphery of a thickened insert plate, or the fillet weld around the periphery of a reinforcing plate, shall be at least the greater of 10 times the shell thickness or 12 in. from any butt-welded seam or the bottom-to-shell or roof-to-shell joint. As an alternative, the insert plate (or the API Std 650 flat-bottom tanks reinforcing plate in an assembly that does not require stress relief) may extend to and intersect a flat-bottom-to-shell corner joint at approximately 90 degrees.

Test welds of each API 650 tank nozzle and manway reinforcing pad (or each section of multiple piece pad) using dry air and apply a soap solution test in the presence of Purchaser's Inspector before hydro testing the API Std 650 flat-bottom tanks tank. Tap one inch NPT test hole in each pad or section.

In December, 2018, our Vietnam customer purchased 352 tons SA387Gr12Cl2 and SA387Gr11Cl2 API Std 650 flat-bottom tanks steel plates for their tank fabrication project. The customer need those cargo urgently, and we keep many stock in warehouse , it only takes about 3days we collect total cargo for shipping to customer. The customer are very appreciate our quality and service. They API Std 650 flat-bottom tanks become our regular customer and repeat order to us every month.

Generally speaking, the duration of the "exhalation" of the API Std 650 flat-bottom tanks is longer than that of the "inhalation" of the API Std 650 flat-bottom tanks every day. There are many factors affecting the "small breathing" loss, mainly including the following points: the change of temperature difference between day and night, sunshine time of the API Std 650 flat-bottom tanks location, open area of the API Std 650 flat-bottom tanks, atmospheric pressure, filling degree of API Std 650 flat-bottom tanks, etc. When the API Std 650 flat-bottom tanks is full of gas, the space volume is small, and the "small breathing" loss is less; if the space volume is large, the loss is also large.

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