JPS58500476A - Lined tank unit for transporting corrosive materials - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Lined tank unit for transporting corrosive materials Field of the invention The present invention relates to a container for transporting highly corrosive fluids, and more particularly, the present invention relates to a container for transporting highly corrosive fluids. The invention relates to a transportation container lined with fluorinated carbon polymer, and a transportation container lined with fluorinated carbon polymer. The present invention relates to a method for producing a toner.

with each tank having a seamless liner of chemically resistant thermoplastic polymer. and together in parallel relationship on a support such as a truck chassis or pallet. Concerning container units that are aggregated. These container units The purity of products such as highly corrosive fluids and foods must be maintained during transportation. It is designed to transport all types of drugs, etc. The tank is easy to clean Moreover, it weighs much less than commonly used stainless steel tanks. ing.

Background of the invention Nitric acid is used in the production of various electronic products such as silicon wafers. , a highly pure acid such as sulfuric acid is required.

Although it is possible to produce acids with a high level of purity, there are Problems were encountered in maintaining the quality of the acid during transportation. Usually these acids are transported in tank trucks with chemically inert liners; Uta liners are known to deteriorate and the metal shell around the liner The body is exposed to acid, which results in harmful reaction products entering the acid.

Various attempts have been made to provide inert liners to tanks. corrosive drug Some tanks and lorries used to transport goods are equipped with a single unit lined with inert material. Relatively large tanks (both diameter and length) are provided. Inert liner material glass was used, but the glass was fragile (due to the bending of the surrounding metal shell). Easy to crack.

To overcome the limitations of glass liners, the tank is fitted with a fluorinated carbon polymer sheath. The lining was made of a similar material. The excess edges of the sheets are overlapped and melted together. abutted to form a continuous liner. This light is relatively expensive to install. One of the problems with liners is that these welds weaken the liner in the area of overlap. This causes the liner to crack or tear. Besides, Tan The tank is usually not completely filled to provide head space for the expansion of the liquid. Therefore, when a tank is installed, liquid moves forward in the tank when the vehicle is started or stopped. swinging backwards. This fluid movement causes a vacuum to act on the liner; tend to tear the shell from inside the shell, leaving the shell susceptible to the erosive action of the acid. Let's go.

Still other techniques have been attempted for securing the liner to the inside surface of the protective shell. example for example, on one side of a fiberglass fabric liner).

A fluorocarbon polymer is coated on the liner side, and the fabric is placed on the other side to form a sturdy shell. This method involves applying an adhesive that adheres to the inner surface. This technology uses glass fiber fabric Overall, it is difficult to make it completely impermeable to fluids. Not satisfactory.

For tanks containing steel shells lined with fluoropolymer, Another problem is that vapors from some chemicals can attack the liner and condense between the liner and the shell. It acts on the steel shell and the adhesive used to secure the liner to the shell. This may result in structural damage to the shell and separation of the liner from the shell. It is.

Maintaining the purity of seed chemicals, all kinds of food ingredients, and products during transportation has become a must. The objective is to provide an improved container for transporting such cargo.

Another object of the invention is that the invention is comprised of a plurality of tanks, each of which has structural requirements. Outer shell formed from reinforced fiberglass thermoset giving each tank robustness and strength Has a chemically resistant, seamless thermoplastic liner that firmly anchors within the body The purpose of the present invention is to provide a new transport tank unit.

Transport tanks containing multiple tanks that are not subject to the corrosive effects of such vapors, even if possible. The objective is to provide a link unit.

To provide a transport tank unit which is particularly threaded to accommodate.

This tank unit consists of a support and multiple tanks installed in parallel on the support. Including links. Each tank has a robust outer shell of reinforced glass fiber thermoset resin and Chemically, such as a copolymer of tetrafluoroethylene and fluoropropylene, Seamless cylindrical liner made of durable thermoplastic material that is rigidly secured to the inner surface of the shell. Includes liner. The liner and shell are woven, knitted, knitted, etc. It is joined by an intermediate layer in the form of a fiberglass fabric made.

More specifically, in manufacturing the tank constituting the transport tank unit of the present invention, The method for fabricating the tank is described below in detail using a seamless thermoplastic liner. A permanent mechanical bond is achieved between the outer surface of the dyer and the fabric in a molten state.

Continuous, preferably glass, impregnated with a thermosetting resin such as a polyester resin A layer of fiberglass is applied to the outer surface of the reinforced fiberglass liner, the resin is cured, and the The outer layer is then bonded to the glass fibers. This outer layer provides each tank with structural desired Provides solidity and strength. Each tank contains a fluid that swings back and forth inside the tank. Connecting the upper part of the opposite end of the tank to suppress the vacuum created by equal pressure Can be equipped with a chemical tube.

Brief description of the drawing The foregoing objects and other objects, features and advantages of the present invention will be apparent in connection with the accompanying drawings. This will become clear from the explanation that follows.

FIG. 1 is a side view of an embodiment f4 of a tank transport unit embodying the present invention. It is.

FIG. 2 is an enlarged end view taken along the λ-=2 line in FIG.

FIG. 3 is a side view of another embodiment of the tank transport unit.

FIG. 4 is an end view of the unit shown in FIG. 3.

FIG. 5 is a partially enlarged cross-sectional view illustrating one preferred tank construction.

Figure 6 shows the modification of one of the tanks of the tank transport unit illustrated in Figure 1. A modification is shown in which the tank has an equalization pipe that equalizes the pressure at both ends of the tank. It is preparation.

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to the drawings, FIG. 1 shows a tank transport unit constructed in accordance with the present invention. This diagram illustrates cut 1o. As understood from FIG. 1, tank transport unit 1 0 extend in a spaced parallel relationship along the length of the trailer chassis 11. It has a trailer chassis 11 supporting a series of tanks 12 to 15. do. Tanks 12-15 are connected by various devices such as yoke assemblies 16, 17, 18. are tightened together and to the trailer chassis 11. illustration In the embodiment, the upper pair of tanks 12 and 15 are the lower pair of tanks 1. Vertical stacking above 3.14. However, the diagram shows 4 tanks. In addition, the tanks 2L 22 and 23 are staggered on the support barret 24. An odd number or an even number of tanks can be installed in the manner illustrated in Figures 3 and 4. can be arranged. This embodiment is suitable for cargo on sea transport vessels such as container cargo. Provides a transport tank or container unit 25 specifically for transport It is.

Each tank, such as tank 12, contains a corrosive liquid, such as an acid or a corrosive solution, or a food product. It is designed for the purpose of transporting goods that must be protected from contamination during transport.

As mentioned previously in this article, corrosion can be prevented by using a transport tank with a relatively large diameter. One of the problems encountered when transporting liquids is that the tank lining (made of glass) cracks due to flexing (if made of chemically resistant plastic) or If the tank is installed in The lining peels off from the inside surface of the tank due to the vacuum applied to the inside of the tank. There is a tendency. Other problems include the adhesive between the liner and the metal shell. and corrosive vapors acting on the shell itself seep into the liner.

Here, FIG. 5 is an enlarged partial view of the upper left corner of the tank 12 illustrated in FIG. 1. By reference, tank 12 has a pair of radially outwardly extending annular flanges at opposite ends. It will be appreciated that it has a rigid tubular shell 12a with a hinge 12b. The relevant fu Only a portion of one flange of the flange is shown in FIG. Flange member and tubular shell The bodies are assembled separately according to the methods hereinafter described, and the flanges are provided with shells. The tape is designed to allow for acceptance of the end of the body and adhesive fixation to the relevant flange. Preferably, the hole is provided with a circular opening only slightly larger than the outside diameter of the tank shell. Ll. A circular cover plate 12c is installed across both opposite ends of the tank 12. , and is fixed to the annular flange 12b by the port 12d.

The circular cover plate 12c has an outlet fitting 12e and an outlet 12f (see Figure 2). It is preparation. The outlet fitting and the outlet preferably have a liner or e.g. Manufactured from a corrosion-resistant material such as Oro-polymer. The inner peripheral edge of the tubular shell 12a is , in the case of the present invention, preferably polytetrafluoroethylene and hexafluoropropylene. coated with a liner 19 made of a chemically resistant thermoplastic material that is a copolymer of has been done. [21] made of the same material is also provided on the inner surface of the circular cover plate 12c.

Liner 19 is an extruded seamless tube that is cylindrical in cross-section. annular flange 12b for the purpose of deforming the outer surface so as to extend radially outwardly. Heat and pressure are applied in a direction perpendicular to the axis of the nut 19. Similar liner material A circular cover plate 12c, which is an end cover plate fixed with adhesive, covers both sides of the tubular shell 12a. It is arranged across the end and is fastened to the annular flange 12b by the pole) 12d. It is attached. The tank 12 assembled in this way is shown in FIGS. 1 and 3, respectively. A second tank transport unit 10 or transport tank 25 is shown. Tanks 13, 14, 15, etc., constructed in a similar manner in the manner illustrated in fig. Can be assembled together with the tank.

(For example, the inner diameter of the tank shell should be approximately 2 feet or slightly less.) The length of the tank can be changed depending on the purpose of use. Wear. In the embodiment of FIG. 1, the tank is approximately 30 feet long; The length to diameter ratio is approximately 15:1. Liner 19 has a wall thickness of 100 mils or more. Extruded to a slightly larger value.

History of the stress on the liner 19 caused by applying liquid in the axial direction of the tank In order to reduce the amount, each tank has a space above the liquid (head 5 pace). Means for equalizing the pressures may be provided. For this purpose, 120 tanks The mounting located in the upper position of the end is the isobaric tube 30 ( Fig. 6) is the - setting. The isobaric tube 30 connects the tank 12 when the tank is in a horizontal position. It communicates with the space above the liquid in the tank at both ends on the opposite side of the tank. For example, when the tank 12 is subjected to sudden axial movement during transportation, as illustrated in FIG. When subjected to a leftward acceleration action, it operates to cause fluid to flow into the isobaric pipe 30. this The movement of the fluid eliminates the vacuum on the liner 19 at the rear end of the tank 12, causing the liner to To prevent the inner 19 from peeling off from the shell. The equal pressure pipe 30 is provided with an exhaust port 33. The isobaric tube 30 is installed using metal fittings 31, 32. Exhaust vents are designed to withstand corrosive chemicals Preferably, it has the same structure as the tank.

The tank used in the transport tank unit of the present invention is [method of forming laminated pipes] As stated in patent application No. 06/200.263, filed on October 24, 1980, Preferably, it is manufactured according to the same method.

According to the method of the above-mentioned application, the sleeve having a seamless structure has chemical resistance. around a seamless tube of thermoplastic polymer having a Inside the liner A plug is inserted within each end of the liner to seal against the surrounding atmosphere. . The plug has the effect of increasing the pressure inside the liner when the liner and sleeve are heated to raise the temperature. A pressure relief valve is provided to prevent the force from exceeding a predetermined pressure.

The liner has a boiling point substantially below the melting point of the polymer forming the liner; A liquid is introduced that does not chemically alter the polymer. Next, the enclosing sleeve A liner is placed on a pair of spaced apart parallel rolls. The role is Extends the length of the liner and supports the liner and sleeve to align the axis of the liner. It is designed to rotate around. While the liner and sleeve are being rotated Heat is applied through the sleeve to an arcuate portion of the outer surface of the liner. This heat is light The pressure inside the liner melts the polymer on the outer surface of the liner, causing the pressure inside the liner to A portion of the liquid in the liner is also volatilized to exceed the pressure of .

Due to the weight of the liquid contained in the liner, sleeve, and support rod, The nip between the lines also suffers considerably. Next, the liner The rimmer is cooled to solidify, thus creating a permanent bond between the liner and sleeve. A mechanical lock is formed.

A support shell is then attached to the outer surface of the sleeve. This shell can be made of glass, for example. Continuous filament bundles such as filaments are processed into liquid thermosetting resins such as polyester resins. by passing it through a bath of thermoplastic resin and then wrapping the resin-impregnated fibers around the sleeve. can be formed. Thus, the outer shell may have a shell diameter of, for example, approximately 1.5 to 12.7 mm. In addition, until the tank is thick enough to produce the final tank with the desired fastness and strength, Manufactured by layering resin-impregnated fibers. After that, the resulting composition is The thermosetting resin is left at room temperature to harden.

The liner 19 is designed to maintain the purity of the material being transported, especially depending on the material being transported. It can be studied in thermoplastic materials, which have properties such as resistance to chemical influences.

Examples of such thermoplastic polymers include polymers such as polyethylene and polypropylene. Lyolefins and fluorinated polymers, The fluorinated polymer is used in tanks designed to transport highly corrosive chemicals. ・Specially passed through the liner for the unit. A typical example of a fluoropolymer is polyvinyl vinyl. poly-vinylidene fluoride ) Melt-fabricable bars Fluoroethylene copolymer, such as hexafluoropropylene (FEP) fluoroolefins, or perfluoroalkyl vinyl ethers, or For example, chlorine copolymerized with non-fluorinated monomers such as alkylenes such as ethylene. Contains rottrifluoroethylene and tetrafluoroethylene; contains ethylene/ethylene binary polymers and hyterpolymers; Copolymer of trafluoroethylene and hexano-1-fluoropropylene (FEP) is particularly useful. 5-20% by weight hexafluoropropylene, 80-95% by weight The FEP copolymer containing % of tetrafluoroethylene is used in the transportation tank of the present invention. It is particularly suitable as a liner material for use in unit tanks.

Liner wall thickness can vary and is generally about 100 mils or somewhat higher. .

For a fabric sleeve that surrounds the liner, laminate the liner to the sleeve. Weaving or knitting with fibers that do not deteriorate in quality at the elevated temperatures used in I can do it. Suitable fibers include glass fibers, metal fibers, graphite fibers, and ceramic fibers. Contains natural or synthetic fibers, such as wood fibers, aramid fibers, aramid fibers, etc. It will be done. In terms of desirable physical properties such as chemical inertness and strength, glass fiber is preferable.

The sleeve is a form of woven fabric that is spirally wrapped around the liner. can be added to. Sleeves, on the other hand, are seamless knits added onto the liner. It can be made into a mesh or tubular knitted fabric.

End covers or caps for use on tanks may be manufactured in the manner described in the above-referenced pending application. Take a section of the tubular liner to which the woven sleeve is mechanically secured, and It can be manufactured by cutting along the length to obtain a flat sheet. next The liner material is mechanically bonded to a layer of glass fabric impregnated with a thermosetting resin. The side of the fabric that is opposite to the side that is Nate cures the resin and bonds the layers together to form a monolithic cover. left at room temperature. Before carrying out the assembly described above, the relevant layer is Can be cut into circular parts with a diameter. After the resin has cured, the end cover has an edge A hole for receiving the bolt 12d for bolting the cover to the annular flange 12b is It can be provided at the periphery.

From the foregoing, it is clear that the present invention does not particularly affect the quality or purity of corrosive fluids or other materials. Provides a transport tank with an improved liner for safe, noise-free transport It is clear that

Having described the preferred transport tank unit structure in detail, the attached claims Various modifications may be made without departing from the technical idea and scope of the present invention as specified in the scope. , changes can be made.

Claims (1)

[Claims] 1. A tank transport unit that is particularly suitable for transporting highly corrosive liquids. Therefore, a support body and a plurality of relatively small diameter pieces installed in parallel relation on the support body. Each tank has a rigid cylindrical shell made of fiber-reinforced thermosetting resin. and a seamless tubular cavity formed of a corrosion-resistant thermoplastic polymer within the shell. The sleeve is adhesively fixed to the shell by a thermosetting resin forming the shell. and thus the liner is exposed to vibrations of the liquid being transported in the tank. resists separation from said shell due to vacuum applied to the opposite end of said shell; A tank transport unit comprising closure means extending across the section. 2. The tank transport according to claim 1, wherein the support comprises a pallet. sending unit. 3. The tag according to claim 1, wherein the support body comprises a vehicle chassis. transport unit. 4. Generate a flow of the fluid being transported into it in response to the shaking of the fluid being transported, and the tank so as to reduce the vacuum on the liner as a result of the shaking. A tank transport unit according to claim 1, having a spacing of an upper part of the tank transport unit. to. 5. The conduit is provided outside the tank, and the upper part of one end of the tank is connected to the other end. 5. A tank transport unit according to claim 4, which is connected to the upper part of the tank transport unit. 6. The shell body is provided with an annular flange of fiber-reinforced thermosetting resin at each end thereof, and the front at each end so that the liner covers at least a portion of the outer surface of the flange. and extending radially outwardly such that the cover plate extends radially outwardly from the flattened end of the liner. fiber-reinforced thermoplastic having a layer of corrosion-resistant thermoplastic polymer on its inner surface in sealing engagement with the The tank transport unit according to claim 1, which is made of a curable resin. 7. The tank shell comprises a rigid wrap around the sleeve. The tank transport unit according to item 1 of the scope of demand. 8. The fluorocarbon polymer is tetrafluoroethylene and exaflu A tank transport according to claim 7, comprising a copolymer of olopropylene. sending unit. 9. The fabric sleeve comprises a seamless knitted fabric of glass fibers.