Method And Apparatus For Abating Fugitive Emissions From A Volatile Liquid Storage Tank

a volatile liquid storage tank and fugitive emission technology, applied in the field of apparatus and a method to abate fugitive emissions from volatile liquid storage tanks, can solve the problems of prohibitively expensive machining close tolerances, difficulty in sealing a conventional floating roof assembly against the interior of a tank that may exceed, and conventional seals that are unusable on large floating roof-equipped tanks

Inactive Publication Date: 2009-10-29
HILLIARD EMISSION CONTROLS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

A conventional floating roof assembly may comprise one or more peripheral seals to obstruct evaporating gasses from escaping the tank and entering the atmosphere, but it is difficult to seal a conventional floating roof assembly against the interior of a tank that may exceed, for example, 100 meters in diameter.
The large size of the tank and the movable floating roof assembly makes machining close tolerances prohibitively expensive, and factors such as ambient wind direction and speed, ambient and stored liquid temperature, and uneven solar heating make conventional seals unusable on large floating roof-equipped tanks.
These peripheral seals generally slow and reduce, rather than substantially prevent, fugitive gas emissions.

Method used

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  • Method And Apparatus For Abating Fugitive Emissions From A Volatile Liquid Storage Tank
  • Method And Apparatus For Abating Fugitive Emissions From A Volatile Liquid Storage Tank
  • Method And Apparatus For Abating Fugitive Emissions From A Volatile Liquid Storage Tank

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Embodiment Construction

[0020]In one embodiment of the apparatus of the present invention comprises a floating roof assembly comprising a generally disk-shaped buoyant roof structure having a first peripheral seal disposed about its periphery to engage the interior wall of a volatile liquid storage tank and to define an annular gas chamber about the roof structure and generally below the first peripheral seal. The embodiment further comprises at least one aperture penetrating a component of the floating roof tank assembly that is coupled to a first end of at least one fluid conduit. A second end of the at least one fluid conduit is coupled to the inlet to a gas mover, such as a positive displacement compressor or a centrifugal compressor, such as a fan, to continuously withdraw gas from the annular gas chamber.

[0021]As fugitive gas is continuously withdrawn from the annular gas chamber, a small vacuum, preferably less than about 0.15 inches of water, is imparted to the annular gas chamber as a result of th...

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Abstract

A fugitive emissions abatement system for use a storage tank 4 with a floating roof assembly 10 comprises a roof structure 12, a first peripheral seal 70 slidably engaging an interior surface 4A of the tank 4 to form an annular gas chamber 60 intermediate the first peripheral seal 70 and the liquid level 50 within the tank 4, and an aperture 78 in the first peripheral seal 70 coupled to the first end 82 of a fluid conduit 80. The second end 81 of the fluid conduit 80 may be coupled to the inlet of a gas mover 88 so that operation of the gas mover 88 draws gas from the annular gas chamber 60 through the fluid conduit 80 so that it can be delivered to a processing apparatus that may include, but is not limited to, a compressor, a vessel, a heat exchanger and / or an incinerator.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention is directed to an apparatus and a method to abate fugitive emissions from a volatile liquid storage tank. The present invention is directed to an improved floating roof assembly to abate fugitive emissions from a volatile liquid storage tank.[0003]2. Description of the Related Art[0004]Storage tanks are used to store volatile liquids including oil and other liquid hydrocarbons, produced brines, organic and non-organic chemicals, solvents, etc. Storage tanks may also be used to store sewage and other mixtures related to public utilities. In some storage tanks, the roof is not fixed, but instead it is adapted to be buoyantly supported by the liquid stored in the tank, and to rise and fall with the level of the liquid stored it the tank. The floating roof assembly may be buoyantly supportable within the interior of a liquids storage tank. For example, the floating roof assembly may be adapted with iso...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B65D88/46
CPCB65D88/48B65D88/46
Inventor HILLIARD, JR., HENRY T.MOROVICH, GEORGE LEE
Owner HILLIARD EMISSION CONTROLS
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