RU1778034C - Container for chemical products and for manufacture thereof - Google Patents

Abstract

Usage: in the chemical and other industries. SUMMARY OF THE INVENTION: a container comprises a body with a lid and a bottom and a liner of a liquid impermeable material with process pipes. The liner is installed in the cavity of the housing with the formation of free space between them. The liner is made of a thermoplastic pipe formed in the form of a cylindrical spiral. The turns of the spiral at the point of contact are hermetically connected to each other. The cover and bottom are equipped with fittings inserted into the cavity between the liner and the housing. A method of manufacturing a container includes mounting the insert in a cavity of the housing and checking the tightness of the insert. The insert is molded in the form of a cylindrical spiral from a thermoplastic pipe, the turns of which are in contact with each other. The turns at their contact point are hermetically connected by welding. The tightness of the liner is checked by supplying inhibited water to the cavity between the liner and the housing. 2 s.p. f-ly. 2 ill. next to

Description

The invention relates to means for storing and transporting aggressive media and can be used in any field of national economy where protection of the internal surface from the effects of aggressive media is necessary.

A known container for chemical products with a polymer lining, comprising a metal case with a shell and bottoms and a liner of thermoplastic material, as well as a method of installing a polymer lining in a container case, comprising mounting this liner of thermoplastic material on the inner surface of the case with subsequent control of its integrity.

Their disadvantage is the low reliability of protection, since the liner is made of sheet material and is free

inserted into the container body is not a self-supporting structure. In a tank of a large volume (more than 3M), the load from the pressure of the medium on the walls of the liner and especially on the welded joints is so large that they lead to a violation of the integrity of the lining.

A container for chemical products with a polymer lining is known, including a metal case with a shell and bottoms and a liner of thermoplastic material mounted on the inner surface of the case, as well as a method of installing a polymer lining in the case of a container for chemical products, including mounting a liner of thermoplastic sheet material on the inside the surface of the housing with subsequent control of its integrity.

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An increase in the reliability of protection of the container body is achieved due to the fact that the liner of thermoplastic sheet material with adhesive compositions is tightly attached to the walls of the container body, while the load from the pressure of the medium is transferred completely to the container body and thus its destructive effect on the lining integrity is minimized.

The disadvantage of this technical solution is the great complexity of mounting the liner, due to the need for preparatory work to clean the walls of the tank body (shot blasting or sandblasting), the difficulty of attaching the liner to the inner surface of the housing, requiring careful gluing.

In addition, during the operation of the container at temperatures above 40 ° C, due to the high coefficients of linear expansion of polymeric materials, stresses arise in the lining material, which, in the case of rigid fastening to the walls of the body, deform the liner and subsequent failure, which reduces the operational reliability of the whole capacity in general.

A composite container is known having an inner container made of a minimum amount of liquid impervious material. The inner container has a cup-shaped bottom and a cylindrical side wall. The outer tubular casing of the container is made of non-metallic material. The inner surface of the casing is connected to the cylindrical wall of the inner container. The casing serves as the main load-bearing element of the container.

The disadvantage of this device is the low reliability of protection, because the inner container is not a rigid self-supporting structure. Attaching the inner container to the outer casing does not allow the integrity of the lining to be monitored, which can damage the liner impermeable material and reduce operational reliability.

The aim of the invention is to increase operational reliability and reduce the complexity of installation.

The implementation of the insert made of thermoplastic material in the form of a mono-spiral, the turns of which are adjacent to each other and hermetically connected to each other, allows you to create a rigid, self-supporting design of the insert, the installation of ex in the container body does not require gluing to the walls of the container body. Emerging

at high temperatures, linear changes in the lining material are compensated by a change in the volume of the monospiral pipe. If necessary storage

small volume liquids (up to 3 m), the liner can independently fulfill the function of a container for storing chemical products.

To achieve the goal in

0 containers for chemical products, comprising a rigid casing with a lid and a liner made of a liquid-impermeable material with technological nozzles installed in the cavity of the housing with the formation of free space between them, the liner is made of a thermoplastic pipe formed in the form of a cylindrical spiral, and the spiral turns place of their contact hermetically connected

0 between themselves, and the lid and bottom are equipped with fittings inserted into the cavity between the liner and the housing.

A method of manufacturing a container for chemical products involves mounting a plug 5 of liquid-impervious material in the cavity of the housing and checking the tightness of the liner, the liners being formed into a cylindrical spiral from a thermoplastic pipe, turns

0 which are in contact with each other, the turns in the place of their contact are sealed by welding, and the tightness of the liner is checked by supplying inhibited water to the gap between

5 liner and housing.

In FIG. Figure 1 shows the construction of a chemical product container - general view; in FIG. 2 is a diagram of the installation of a polymer lining in a container body for chemical products.

The chemical product container consists of a metal case 1 with a shell 2, bottoms 3 and 4, an insert 5 made in the form of a mono-spiral from a thermoplastic pipe 6, the turns of which are tightly adjacent to each other and welded at the joints 7. Diameter and thickness the walls of the pipe 6 are selected so that at a given operating temperature, the liner 5 remains self-supporting. The bottoms 3 and 4 are equipped with fittings 8 and 9. The tank has a hatch 10 and a drain pipe 11, respectively protected by inserts 12 and 13 of thermoplastic sheet

5 material and welded to the main liner 5.

A method for installing a polymer lining is carried out as follows. A continuous thermoplastic pipe 6 s is introduced into the metal housing 12 through

by means of a feeding device from the bay and its end is fixed on the lower bottom 4. Then, the pipe 6 is tightly laid round to round along the forming surface of the tank body 1.

To seal the junction 7 of the turns of the pipe 6 are welded, while at the points of contact of the turns of the pipe, welding is carried out without an additive, and then the joints are additionally welded with an additive on the inside of the liner (a rod of thermoplastic material can be used as an additive). Then, the hatch 10 and the drain pipe 11 are protected by inserts 13 and 12, which are welded to the main insert 5. After that, the integrity of the lining is checked, for which inhibited water is supplied through the nozzle 9 until it overflows through the nozzle 8. If the liquid is not flowing It is on the inner surface of the liner, which means that the lining is made without defects.

If necessary, places of defects are boiled with thermoplastic material.

The insert is mounted in the container body 1 without preparation of the inner surface (it is possible that residues of the old paintwork or glued insulation are present on the surface).

After a guaranteed service life, the liner of thermoplastic material is dismantled in the reverse order with preliminary cuts of the joints with an electric knife and the container is lined again by the proposed method.

An example of a specific implementation is the storage tank for fluoride

Claims (2)

acid, the operation of which began at the Nikopol South Tube Plant. The body of the tank is made of St 3. The volume of the tank is 20 m3, the wall thickness of the body is 8 mm. 5 Lining - made of thermoplastic pipe (polypropylene), diameter 50 mm, tube wall thickness 3.9 mm. The claims 1. The capacity for chemical products, 0 comprising a rigid casing with a lid and a bottom and a liner made of a liquid-impermeable material with process pipes installed in the cavity of the casing with the formation of free space between them, characterized in that, in order to increase reliability and reduce the complexity of installation, the liner is made from a thermoplastic pipe molded in the form of a cylindrical spiral, and the coils of the spiral at their contact point are hermetically connected to each other, and the cover and bottom are equipped with fittings inserted into the cavity between the contribution we are and body. 5 2. A method of manufacturing a container for chemical products, comprising mounting the liner from a liquid-impervious material in the cavity of the housing and monitoring the tightness of the liner, characterized in that, in order to increase reliability and reduce the complexity of installation, the liner is formed into a cylindrical spiral from a thermoplastic pipe, turns of which are in contact with each other, turns 5 in the place of their contact are sealed by welding, and the tightness of the liner is checked by supplying inhibited water to the cavity between the liner and the housing. ABOUT g