Receptacles – Stationary tank – For petroleum or a petroleum product
Patent
1996-03-06
1998-10-13
Moy, Joseph M.
Receptacles
Stationary tank
For petroleum or a petroleum product
220584, 220 412, B65D 9002
Patent
active
058199772
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention concerns a tower device in spherical tanks for the transport of liquid gas, wherein the tower extends between the bottom and the top of the tank, comprising a device which permits mutual movement of sections of the tower and the tank in the tower's longitudinal direction.
DESCRIPTION OF THE BACKGROUND ART
From the prior art it is known that a tower can be permanently secured in a spherical tank which is used for the transport by ship of cold products, e.g. liquid natural gas (LNG). Even though problems were thereby eliminated with which the previous devices were encumbered, a new problem was created. In certain situations, for example, when the tower has a different temperature to the tank shell, when the tank is completely or partially filled, or when the tower is subjected to forces from splashing of liquid in the tank, the tower sets up extra stresses in the tank shell. These can be reduced, e.g. by increasing the thickness of sections of the tank shell. Since this is impractical, it has been suggested that a section of the tank near the top of the tower should be flattened out somewhat, thus making the tank shell more elastic at this point. However, for reasons connected with production, it is not desirable for the shape of the tank to deviate from the spherical shape, and no such flattening out has been performed in practice.
Alternatively an elastic or flexible element can be installed or a transition in the tower at an optimum level, depending on design and operational factors.
The design of flexible transitions of this kind will vary since different requirements can be placed on the design on the basis of the tank's size, the location for the tank's installation (on board ship or ashore) and thereby the desired stresses in the tank shell, various requirements for equipment (e.g. pumps) and thereby the requirements for space in the tower foot, various properties of the loads which have to be carried (e.g. LPG, ethylene, LNG or liquid nitrogen, oxygen or hydrogen) which thus will give different combinations of static and dynamic loads, and different materials in the tank. The solution which is best for one combination of these requirements is not necessarily best for another combination. The known transitions create relatively few variable parameters, a fact which limits the choice of optimum solutions for the elastic connection or transition.
SUMMARY OF THE INVENTION
The object of the invention is to provide a device of the above-mentioned type which is encumbered in a less degree with these disadvantages while retaining the main principle that the tower should be fixedly secured.
The characteristics of the invention are indicated by the features in the claims presented.
Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described in more detail with reference to the drawing which schematically illustrates embodiments of the device according to the drawings which are given by way of illustration only, and thus are not limitative of the present invention, and wherein:
FIG. 1 illustrates a longitudinal section through a first and a second embodiment of a device according to the invention, where the embodiments are shown on respective sides of the tower's longitudinal axis.
FIG. 2 illustrates a longitudinal section similar to that which is illustrated in FIG. 1, through a third and a fourth embodiment of the device according to the invention.
FIG. 3 illustrates a longitudinal section through a fifth embodiment of the device according to the invention.
DETAILED DESCRIPTION OF THE P
REFERENCES:
patent: 3707078 (1972-12-01), Cramer
Kvaerner Moss Technology a.s.
Moy Joseph M.
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