Types of Storage Tanks (Fixed Roof )

Fixed roofs are permanently attached to the tank shell. Welded tanks of 500.bbl capacity and larger tray be provided with a frangible roof (designed for safety release of the welded deck-to-shell joint in the event excess in eternal pressure occurs). Technical Data used in the field explained in petroleum courses in rawalpindi. In this case, the design pressure should not exceed the equivalent pressure of the dead weight of the roof including rafters, if external.

Floating Roof:

Storage tanks may be furnished with floating roofs whereby the tank roof floats on the stored contents. This tank type is used primarily for storage near atmospheric pressure. Floating roofs are designed to move vertically within the tank shell to provide a constant minimum void between the surface of the stored product and the roof. Floating roofs normally are designed to provide a constant seal between the periphery of the floating roof and the tank shell. Some more details of petroleum courses in rawalpindi are as under.

They can be fabricated in a type that is exposed to the either or a type that is under a fixed roof. Internal floating-roof tanks, with an external fixed roof, are used in areas of heavy snowfall since accumulations of snow or water on the floating roof affect the operating buoyancy. These can be installed in existing tanks as well as new tanks. Both floating roofs and internal floating roofs are used to reduce vapor losses and to aid in conservation programs.

Cone-Bottom Tanks:

The cone bottom in either the bolted or the welded tank offers a means of draining and removing water. or water cut oil. from only the bottom of the tank, leaving the marketable oil above. The drain line from a sump-equipped cone bottom must be equipped with a vortex breaker to drain off most of the water without coning oil into the drain. With a flat-bottom tank, some of the marketable oil must be removed if all the water is removed from the tank. Corrosion on the tank bottom is kept to a minimum by keeping all water removed. A cone bottom can be kept clean without having to open the tank if I or 2 bbl are drained off once or twice weekly and pumped back through the treating system. If this is not done and the bottom solidifies, the tank must be opened. The conc bottom tank can be cleaned without entering. A water  hose, handled just outside the cleanout opening. can be used to flush the solids to the center of the cone and drain connection. TSK Training for Skills and Knowledge is the best institute in Rawalpindi Islamabad for Pakistani Students who wants to join oil field after petroleum courses in Islamabad.