Shop-fabricated welded, cylindrical-shape tanks are
available in a large variety of sizes as shop-fabricated items. Technical Data
used in the field explained in petroleum courses in Rawalpindi. The API-12F
specifications’ for vertical shop-welded tanks (Fig. 1 I .2 and Table I I .2)
list standard sizes for nominal capacities of 90 to 500 bbl.
Flat-Sided Tanks (Non-API):
Although cylindrical-shape tanks may be structurally best
for tank construction, rectangular tanks frequently are preferred. When space
is limited, such as offshore, requirements favor flat-sided tank construction
because several cells of flat-sided tanks can be fabricated easily and arranged
in less space than other types of tanks. Flat-sided or rectangular tanks
normally are used as atmospheric type storage. Some more details of petroleum courses
in rawalpindi are as under.
Field-Welded Tanks:
Field-welded tanks provide large storage capacities in a
single unit. API Spec. 12D lists standard sizes ranging from 500- through bbl
nominal capacity. Although the sizes set forth in this specification are closely
paralleled by bolted tanks, these field-welded tanks are of heavier gauge steel
with a minimum thickness of ‘/ in. for the tank bottom and xh in. for the shell
and deck. Larger field-welded tanks providing storage capacities of 150,000 bbl
or more have become quite prevalent for use in the storage of oil and petroleum
products. Field welded tanks, particularly those larger than IO.000 bbl.
frequently are designed and erected in accordance with API
Standard 6.50. This standard covers material, design, fabrication, erection,
and testing requirements for welded steel storage tanks. It also includes an
alternative basis for shell design, as well as one for calculating tank-shell
thickness. The API Standard 650 also may be used to govern the design and fabrication
of the smaller shop welded tanks. TSK Training for Skills and Knowledge is the
best institute in Rawalpindi Islamabad for Pakistani Students who wants to join
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