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Liquid Refined Product Pipeline Operations DESCRIPTION


COVERED FLOATING ROOF TANK


SIZE AND CONSTRUCTION


• Welded steel tank with vertical cylindrical walls supporting a fixed flat or conical roof, with an internal floating roof or pan that floats on the surface of the product.


• Is essentially a cone roof tank with an internal floating roof.


• Have no vapor space, except when the product is at lowest levels and the floating roof / pan is sitting on its roof supports.


• Identified by the large “eyebrow” vents at the top of the tank shell.


• Typically 40 to 120 ft. diameter, but can be as large as 300+ ft. at refineries and crude oil terminals. Depending upon tank diameter and height, capacities can range from 1,000 to 500,000+ barrels (NOTE: 1 barrel = 42 gallons).


• Fires can be difficult to extinguish through portable application devices.


OPEN FLOATING ROOF TANK


• Steel tank with vertical cylindrical walls and a roof that floats on the surface of the product. There is a seal area between the tank shell and floating roof.


• Have no vapor space, except when the product is at lowest levels and the float- ing roof is sitting on its roof supports.


• Identified by the wind girder around the top of the tank shell and the roof ladder.


• Floating roof may be a pontoon or hon- eycomb design, and have a drainage system to carry normal rainwater off the roof and to the ground.


• Typically 40 to 120 ft. diameter, but can be as large as 300+ ft. at refineries and crude oil terminals. Depending upon tank diameter and height, capacities can range from 1,000 to 500,000+ barrels (NOTE: 1 barrel = 42 gallons).


• Most common storage tank found in the petroleum industry; most common scenario is a seal fire.


OPEN FLOATING


ROOF TANK WITH GEODESIC DOME


• Is essentially an open floating roof tank with a lightweight aluminum geodesic dome installed over the top.


• Geodesic roof structure is installed for environmental emissions and economic considerations.


• Flammable and com- bustible liquids.


• At petroleum storage facilities, will primarily store flammable liquids and higher vapor pressure products due to environmental emissions and economic considera- tions.


Figure 4.11 • Flammable liquids. CONTENTS / HAZARD CLASS


• Flammable and combustible liquids.


• At petroleum storage facilities, will primarily store flammable liquids and higher vapor pressure products due to environ- mental emissions and economic considerations.


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