DE1600515A1 - Stiffener for a thin-walled pipe - Google Patents

Description

DR. MÜLLER-BORE DILPL.-lNG. 6RALFS DR. MANITZ DR. DEUFEL

Hünchen, 5th Shark 1967

⁰¹ - M 7 2

MUEEX LIMITED Rainham, Essex, England

Stiffening agent for a thin-walled pipe

Priority: ITr. 19703/66 of May 4, 1966

9ÖS88B / 0

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This invention relates to stiffeners for thin walled pipes. The invention was developed in connection with tantalum tubes, which are used in chemical plants, in particular as the outer casing of so-called bayonet heaters for heating acids, and is described below in connection with these tubes. Tantalum is used for this purpose because it is practically inert to all acids with the exception of hydrofluoric acid at temperatures up to 250 ° G. Up until now, bayonet heaters for the abovementioned Zv / corner consisted of one or more tantalum tubes through which steam is led down a smooth central pipe, after which the steam returns within the tube inserted into the acids to be heated. JLus reasons ... effective heat transfer and for reasons of economy, since tantalum is very expensive, the pipes were made as thin as possible, taking into account the pressure they have to withstand more than tantalum is a weak metal »

Although the invention was primarily developed to reduce the susceptibility of this system to damage, it should be noted that the invention is limited to this single purpose :; is and can actually be applied to all z \ i '/ firstifendon pipes v / erdan.

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_BATH <**** ■

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According to a further feature of the invention, the tube is further strengthened by adding an expediently A narrow-fitting, ribbed tube or rod made of mild steel is used.

Venn the invention to a thin-walled, the Aussenumrnantelung is applied a Wä'nr.eaustauscheinheit-forming pipe, the split, sleeve advantageously formed of stainless steel, elastic preferably provided with perforations. In this way, direct contact between the pipe wall and the heating or cooling medium contained therein is to be maintained. It has been found that this also improves heat traction as the perforations in the flow of the agent create eddies within the tube.

Me ribs on the inside of the pipe to be stiffened inserted tube or rod are preferably arranged so that they extend along the same. You can on Wish that you could and should be arranged spirally even arranged on the circumference and with openings or Perforations for the passage of the through the pipe. Be provided by means.

An embodiment of the invention is shown in the attached Drawing illustrates in which an oe for example made of tantalum produced, thin-walled pipe 1 is shown, inside which an elastic, split sleeve 2 is used, wherein a snug, ribbed ear 3 within the split sleeve is used. A device of this construction is used as a 3ajor.ett heater for heating

cd acids, used. For this purpose pipe 1 is used by each co

^{m of} appropriate length, closed at one end,

° soäass a heating means, e.g. 3. Water vapor introduced through tube 3 are canoe, among other things then along the through the ribs 4 between

the outer surface of tube 3 and the inner surface of Return pipe 1 demarcated passages.

BATH

As “already mentioned,” the invention is limited not on a device of this type. For example, the device need not be in the form of a bayonet heater but can consist of a simple pipe through which a heating medium is led down in a single direction will. In this case, the finned tube 5 can of course be replaced with a finned rod will. It is also understood that devices of this construction can be used for both cooling and heating purposes can be used.

It has been found that the heat transfer is improved if the sleeve 2 has the perforations shown at 5 or openings is provided. Besides that she allow direct contact between the inner wall of tube 1 and the heating or cooling medium running through the tube these openings also generate turbulence within the pipe, which further improves the heat transfer Has. It has also been found that heat conduction through the Ribs 4 increases the heat transfer.

For certain purposes, perforations or openings in the sleeve can be omitted. If they are provided, they can also be used by anyone Be form. But if the pipe has to withstand high external pressures, the perforations - if provided - are provided are - preferably in the form of a series of narrow slits and in all cases where they are provided, they are preferably dimensioned and arranged so that the through

Passages delimited by the ribs / perforations

are connected to each other.

909885/0 194

This enables any agent supplied to the pipe to be readily diverted if desired. par the division in the sleeve is also of assistance for this purpose, and when a bayonet heater is used this invention is built, it is preferably horizontal, with the division in the sleeve at the bottom, arranged. In addition, it allows the division in the sleeve of course, differences in Warnieaus expansion or -to accommodate shrinkage between the sleeve and tube 1.

Although the invention is primarily in connection with a heating unit consisting of a tantalum tube has been described, it goes without saying, as already mentioned at the beginning, that the invention for the stiffening of pipes of any kind is applicable, although it is of course highly advantageous if the tubes are the outer casing of a Form heat transfer unit. The problem, the solution of which the invention aims at, arises primarily only because of the need to make these sheaths relatively thin. One Another application of the invention would be the stiffening of a thin-walled thermometer pocket, for example from a pipe that is inserted into a liquid or gas, the temperature of which is to be measured.

Finally, it goes without saying that the provision of a tight-fitting, ribbed tube or rod hiffiht an essential feature of the invention is »one elastic, split sleeve alone could provide all the necessary stiffening and could, as at the beginning mentioned, outside instead of inside a pipe

909885/0194

to be ordered. For example, she would be outside a pipe carrying a corrosive agent under pressure can be provided. The invention is also applicable to pipes applicable to any cross-section.

909885/0194

Claims (7)

-V claims 1). Stiffening means for a thin-walled pipe, consisting of a divided one, essentially the same Elastic sleeve which can be attached to the pipe and has linear expansion. 2). A thin-walled tube, which is divided with essentially the same length expansion, attached to it elastic sleeve is stiffened. 3). A thin-walled tube according to claim 2, characterized in that the split sleeve (2) is inside the Rohres is attached resiliently. 4). A thin-walled tube according to claim 1 or 2, characterized in that the tube (l) is further Enhancement · ^1, by substituting in the same a tightly fitting finned tube or rod. 5). A thin-walled pipe according to claim 2, 3 or 4, characterized in that the split sleeve (2) with Perforations (5) is provided. 6). In a bayonet heater comprising a thin-walled tube, the arrangement of for stiffening of the pipe certain means, which result from a divided, resiliently mounted, elastic sleeve exist within the tube (l). 7). Method for stiffening a thin-walled pipe, which consists in the fact that a split, is attached having substantially the same length expansion, elastic sleeve. 909885/019 /, Blank page