RU2008550C1 - Storage tank for liquefied gases and explosive liquids - Google Patents

Abstract

FIELD: civil engineering. SUBSTANCE: storage tank comprises reservoir with shell disposed on base in an enclosure, cable strapping freely-placed on shell and consisting of longitudinal cables connected to circular straps, and housing encompassing said strapping. Diameter of upper circular strapping is at least 10% smaller than that of shell . Longitudinal cables are provided with shock absorbers. If shell happens to be damaged and the resultant jet produces reaction force, the reservoir will move under the effect of plastic-elastic deformation of longitudinal cables and shock absorbers. EFFECT: localization of liquid spillage and reduction of mechanical damage caused by destruction of reservoir shell. 3 cl, 2 dwg

Description

 The invention relates to the construction and operation of storage facilities for liquefied gases and explosive liquids under pressure, and can be used as an isothermal tank for storing liquefied explosive and toxic gases, such as ammonia or chlorine.

 Known storage for liquefied gas containing a tank with a shell located on the base of the fence.

 However, in this storage, if the integrity of its shell is violated, a reactive gas jet is formed through leaks, which leads to the separation of the tank from the base, its rise and fall outside the enclosure with the destruction of the tank and pouring the contents onto the topography. This is due to the fact that the storage does not provide a cable braid, fixed to the base and freely placed on the shell of the tank, to absorb the energy of a gas jet, to limit efforts detaching from the base and to exclude unauthorized (forbidden) movement parameters.

 The aim of the invention is the localization of the strait of the product and reduce mechanical damage in violation of the integrity of the shell of the tank.

 This goal is achieved by the fact that the storage is equipped with a cable braid freely placed on the shell and consisting of longitudinal cables and circular strands connected to them, while the lower ends of the longitudinal cables are attached to the base around the shell.

 The free placement of the cable braid on the shell allows not to load the tank structure with additional loads from the cable tension during normal operation, and in case of emergency depressurization and the appearance of reactive force, it allows absorbing the excess gas flow energy to work on elastic and plastic deformations of the braid elements, and reduce dynamic impact on the tank, significantly reduce the parameters of the movement of the tank and to localize the spill of fluid within the enclosure.

 This goal is achieved more efficiently if the diameter of the upper circular strapping is less than the shell diameter by at least 10%, and the longitudinal cables are equipped with shock absorbers in the form of elastoplastic spring elements.

 To prevent dust deposits and other external influences on the parts of the braid protruding above the shell, the tank is equipped with a casing covering the cable braid.

 In FIG. 1 shows a longitudinal, in FIG. 2 - transverse views of the store.

 The storage tank contains a shell 1 and is installed on the base 2 inside the fence ZO or bulk collapse Zn. A cable braid is freely placed on the sheath 1, consisting of longitudinal cables 4 and circular strands interconnected 5. Shock absorbers 7 are mounted on the longitudinal cables 4. The lower ends of the longitudinal cables 4 are fixed on the base 6 around the sheath 1.

 Storage operates as follows.

 In case of violation of the integrity of the shell 1 through leaks occurs the outflow of gas, the jet of which causes a dynamic effect on the tank. The cable braid prevents the tank from moving up. Under the action of reactive forces, the tank moves by the amount of free travel and elastic or elastoplastic deformation of the longitudinal cables 4 and shock absorbers 7. In this case, the shell 1 is caught by the upper circular strapping as a loop. The upper circular harness immediately after the accident takes on the role of a buffer for a short time, reducing the rate of increase in the load on the longitudinal cables 4. With increasing loads, the longitudinal cables 4 and shock absorbers 7 are included in the work. First, shock absorbers 7 receive elastic deformations, and during emergency loads, plastic deformations, at the same time, they change their shape, turning from springs into rods, and at the same time absorb the excess energy of the gas flow. Due to this, the load rise rate is additionally reduced and its maximum value is limited, the tank is torn off from the base with its subsequent flight outside the enclosure.

 The fastening of the ends of the longitudinal cables 4 to the base around the shell 1 provides resistance to the overturning moment from the jet gas jet and allows in case of an accident to reduce the likelihood of breaks in the pipes leading to the bottom of the tank. (56) Usyukin I.P. Installations, machines and apparatuses of cryogenic equipment. M., 1982, p. 296.

Claims (3)

 1. Storage of liquefied gases and explosive liquids, containing a tank with a shell located on the base inside the enclosure, characterized in that, in order to localize the spill of liquids and reduce mechanical damage in violation of the integrity of the shell of the tank, it is equipped with a cable braid freely placed on the shell and consisting of longitudinal cables and circular strands connected to them, while the lower ends of the cables are fixed to the base around the sheath.  2. Storage according to claim 1, characterized in that the diameter of the upper circular strapping is less than the diameter of the shell by at least 10%.  3. Storage according to claim 1, characterized in that the longitudinal cables are equipped with shock absorbers.

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