DE2445442A1 - Closing and sealing of apertures in pipes or pipe lines - using a primer-coated metal plate and a sealing cpd. under pressure - Google Patents

Abstract

Closing and sealing of orifices and holes in pipes and pipe lines comprises first sanding the rim of the orifices and the inner face of a suitably domed metal plate; applying a 1st primer onto metal plate and rim; drying at 50-60 degrees C for 10 mins.; applying a 2nd primer comprising a rubber soln.; drying for 15 mins.; applying a sealant (known per se) based on rubber, polymer, filler and plasticiser, that has previously been oven-heated at 150 degrees C for 45 mins.; and placing the so-prepd. metal plate onto the orifice that has previously been closed with a plastic cap(sule); and pressing on to the pipe, in a press for 30 mins. Used esp. in gas pipe lines. Provides inexpensive, secure, and rel. simple procedure. No fastening elements e.g. clamps that may corrode in the soil, are needed.

Description

Method and device for closing and sealing openings and holes in pipes The invention relates to a method for closing and Sealing of openings and holes in pipes and pipelines.

It also provides devices for carrying out the process mentioned at.

In pipeline networks, for example gas pipeline networks, comes it often happens that a closed connection that or / that is closed by the Connection in the pipe existing hole or a circular opening closed and sealed must become.

For this purpose, the procedure so far has been that on the tube in In the area of the hole or the opening, a sealing material was applied, which pressed tightly onto the pipe with a bracket held by a pipe clamp will. The bracket is in the form of a yoke with two provided at the outer ends Drilled holes through which the screw bolts of the pipe clamp are inserted and the tensioning with the help of screwed onto the screw bolts Nuts done.

However, this previously known type of closure has disadvantages mainly to be seen in the fact that the fasteners, such as pipe clamp and Brackets, exposed to severe corrosion in the ground, which is not sufficient Security ensures that the seal will last for a long time is absolutely firm and secure. It is also important to ensure a proper seal ensure a relatively large amount of material in the form of the pipe clamp, of the bracket and the nuts are required.

The present invention has now set itself the task of a method for closing and sealing holes and openings in pipes and pipelines to create, which can be carried out more quickly and with significantly less material expenditure is, wherein the tight closure produced by the method is much more secure and is more stable than the previously known closure.

A method of the above is used to solve the problem Type proposed, which is characterized in that initially the pipe area around the opening or the hole as well as one of the tubular jacket surfaces matched arched Metal plate is blasted on the inside with a sandblasting gun, whereupon a first primer on said surfaces of the metal plate and the pipe area is applied, which is then dried at 50 - 60 ° C for about ten minutes is subjected, whereupon a second primer in the form of a rubber solution on said Surface is applied and then a second drying of about 15 minutes takes place and that then a known per se, previously about 45 minutes in one Oven heated to 150 o C heat-sensitive sealing material based on a natural or synthetic rubber with a polymer, one Filler compound and a plasticizer is applied to the metal plate and this so prepared metal plate on the previously closed with a plastic capsule Open the opening in the tube and attach it to the tube with a press for about 30 minutes is pressed.

To carry out the method, a device is proposed, which consists in that over the pipe to be sealed one out of two by spacers interconnected plates formed bracket is set, which is a sufficient has large semicircular recess for pushing onto the tube, with between the legs of the plates on one side an adjustable pressure counterpart and a guide with a hydraulic cylinder is arranged on the other side, its pressure piston with a pressure iron for pressing the sealing plate on the pipe is in communication.

Another device for performing the method consists in one by means of a tension belt on the pipe in the area of the area to be closed and sealed Surface-definable trapezoidal or conical cuff, which is at the top End has a nozzle with air distributor, which is attached to a hose for supply the warm air connected.

Based on the drawings, preferred embodiments are to be used as an example the device, the method according to the invention are explained in more detail.

In the drawings, FIG. 1 shows a front view in principle an embodiment of the device according to the invention with a shown in section Pipe section.

FIG. 2 shows a side view of the device according to FIG. 1.

Fig. 3 shows a cross section through a further embodiment the device according to the invention.

FIG. 4 shows a top view of the device shown in FIG. 3.

In order to systematically illustrate the method according to the invention, initially referred to the device according to FIGS. With 1 is a pipe, for example a gas pipe a city network, designated, which is already laid in the ground and which is one of a kind on the top has switched off connection originating bore 2, which is closed and sealed shall be.

For this purpose, first of all the area 3, shown in dotted lines processed around the opening 2 on the pipe 1 with a sandblasting tool.

Likewise, one of the curvature of the outer jacket of the pipe is corresponding Metal plate 4 processed with a sand straw blower.

Then on the so prepared surfaces of the pipe 1 and the inside of the curved, preferably circular metal plate 4 is a first Primer applied. Before that, the opening 2 is still made by means of a plastic capsule 5 locked.

Then a trapezoidal or conical collar 8, which is adapted to the pipe curvature, placed on the pipe and clamped. A hook 9 is provided in this conical sleeve, in which previously the curved metal plate 4 adapted to the pipe curvature is suspended will.

At the top of the cuff 8 is a nozzle 10 with a Air distributor used. On this nozzle 10 is a hose 11 for supplying the warm air postponed.

After the above-mentioned sandblasting process is finished, the first primer applied, and then warm air is through the hose 11 ins Inside of the cuff 8 is blown. The temperature is 50 - 60 o C, and the drying process takes about ten minutes.

The cuff is then removed and a second primer is used in the form of a rubber solution on the inside of the plate 4 and on the pipe area 3 applied. The sleeve is put back on the pipe and it takes place drying again for about fifteen minutes.

Then the plate 4 is removed from the sleeve, and a heat-sensitive sealing material is applied to the inside, which had previously been preheated to 150 in an oven for 45 minutes. This heat sensitive Sealing material can be based on a natural or synthetic rubber with a polymer, a filler and a suitable plasticizer.

To explain the further process steps, reference is now made to Reference is made to the device according to FIGS. 1 and 2. The in Figures 1 and 2 The device shown for pressing the plate 4 consists essentially of two plates 12 and 13 supported by two spacers 14 and 15 to which they are welded are connected. Both plates have the same circular recess 16 on, which is chosen so large that the device on the to be closed and to be sealed pipe 1 can be conveniently placed. Between the two legs on the left side of the plates 12 and 13 (Fig. 1) a bearing 17 is provided, in which there is an adjustable pressure counter-piece 18, which is on the front has an angled surface profile 19.

On the right side of the leg of the two plates 12 and 13 is a guide 20 with a hydraulic cylinder 21 is arranged.

The extension 22 of the pressure piston of the hydraulic cylinder 21 has an angled sheet metal profile 23 on the front.

A rod 24 is provided behind the angled sheet metal profile 23, Wbeei 25 is pivotably mounted and pulled backwards by means of a tension spring 26 can be.

At the top of the two plates 12 and 13 is another handle 27 provided so that the device can be transported and set up more easily.

Now that the heated heat-sensitive sealing material 28 is on the plate 4 is applied, the plate 4 is against the tube 1 in the area of Opening 2 or the plastic capsule placed. The device shown is thereby so arranged to the pipe that the angled profile sheet 19 of the pressure counterpart 18 opposite the opening 2 and the angled profile sheet 23 by the application of pressure of the pressure cylinder 21 can be brought to act on the plate 4. Of the Pressure is set so that the plate 4 against the tube 1 with a sufficient great force is pressed. The pressing process takes about 30 minutes, after which the pressure cylinder 21 is vented and the part 22 is withdrawn by the spring 26. So is the tube 1 is securely closed and sealed at the desired location.

The device according to the invention can of course also have one learn other modified design without departing from the scope of the invention will.

Claims (5)

P a t e n t a n s p r ü c h e 5 Method and device for closing and sealing openings and holes in pipes and pipelines, characterized in that initially the Pipe area around the opening or the hole as well as one adapted to the pipe jacket surface domed metal plate blasted on the inside with a sandblasting fan whereupon a first primer is applied to said surfaces of the metal plate and the Pipe area is applied, which is then dried at 50 - 60 C approximately is subjected to ten minutes, after which a second primer in the form of a rubber solution is applied to said surface and then a second drying of about fifteen minutes and that then a previously known per se Heat-sensitive sealing material heated to 150 ° C. in an oven for about 45 minutes on the basis of a natural or artificial rubber with a polymer, a Filler compound and a plasticizer is applied to the metal plate and this so prepared metal plate on the previously closed with a plastic capsule Opening in Put the tube on and use a press for about 30 minutes is pressed against the pipe for a long time. 2. Device for performing the method according to claim 1, characterized by one of two spacers that can be placed on the pipe to be sealed (14, 15) connected plates (12, 13) formed bracket with a lower semicircular Recess (16) to be pushed onto the pipe, with between the legs of the plates (12, 13) on one side an adjustable pressure piece (18) and on the other Side a guide (20) with a hydraulic cylinder (21) are arranged, the Pressure piston with a pressure iron (23) to press the seal against the pipe in Connection. 3. Apparatus according to claim 2, characterized in that the pressure iron (23) in an articulated connection with one or both plates (12, 13) via a rod (24) stands and that a return spring (26) is arranged on the rod. 4. Apparatus for performing the method according to claim 1, characterized by means of a tension belt (6) on the pipe (1) in the area of the and opening to be closed (2) definable, trapezoidal or conical Cuff (8), which has a nozzle (10) with an air distributor at the upper end, which is connected to a hose (11) for supplying the warm air. 5. Apparatus according to claim 4, characterized in that in the Cuff (9) a hook for hanging up the plate (4) while it is drying is. L e r s e i t e