FI74417C - Device for drilling holes in a pipe under pressure - Google Patents

Description

rm .... ANNOUNCEMENT

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(51) Kv.lk.4 / lnt.CI.4 B 23 B 1/08

SUOMI FINLAND

(Fl) (21) Patent application-Patentansökning 763279 (22) Application date - Ansökningsdag 16.11.76

Patent and Registration Office Support (23) Start Date-Giitighetsdag 16.11.76

Patent- och registerstyrelsen (41) Tu, iut public - Biivit offemiig 17.05.78 (44) Date of dispatch and of publication. - 30.10.87

Ansökan utlagd och utl.skriften publicerad (86) Kv. application - Int. ansökan (32) (33) (31) Privilege claimed - Begärd priority (71) James Kemp S Co. Pty. Ltd., Creek Road, Currumbin, Queensland,

Australian-Australian (AU) (72) Keith Roderick Herron, Moorooka, Queensland, Australian-Australian (AU) (7 * 0 Ruska δ Co Oy (5 **) Device for drilling holes in pressurized pipes -Anordning för borrning av hai The present invention addresses the problem of drilling holes in a pressurized container or fluid pipe when it is necessary to fit, for example, sleeves or other fittings.

When such a hole needs to be drilled, the pipe or tank is usually depressurized and restored after the hole has been drilled and the necessary equipment fitted.

This requires the pipe or tank to be decommissioned for a period of time, which is obviously not desirable.

In the past, it has been proposed to drill holes in pressure-tight pipes without depressurization, but equipment for this is complex, expensive, and bulky.

The term “tank” as used in this specification hereinafter refers to a “pipe.” It is an object of the present invention to provide a device for drilling and placing the equipment in a hole without reducing the pressure, which device is widely applicable to standard drilling machines.

The device according to the invention for drilling a hole in a pressurized container is characterized in that the front part of the drill support device acting as a drill guide is formed as a core to extend through the seal, and the seal flap is surrounded by an integral annular seal the circumferential seal forms a chamber with the surface of the container, and wherein each flap has a shoulder which, in the closed position of the seal, rests against the annular abutment surface of the holder.

The sector-shaped flaps preferably have edge flanges which rest against each other in a closed position.

To better understand the invention, an example of a device for drilling a hole in a pressurized pipe will be explained in more detail below with reference to the accompanying drawing, in which Figure 1 is a sectional view of a part of a pipe drilling device and Figure 2 shows the seal of Figure 1 in an "closed" position.

Referring first to Figure 1, its left side shows the seal in the "closed position" (drill pulled out), while the right side shows the seal in the "open" position surrounding the drilling rig.

The tube 10 is surrounded by a holder 11 which holds a sleeve-like part 12 supporting the drilling device, which guides the rotating drill bit 13.

The holder 11 can be of any suitable type which holds the device 12 firmly against the tube 10. Thus, for example, the holder 11 may have two radial lugs which are tightened together by bolts or on one side by a hinge and lugs to be fastened by one bolt.

A resilient seal 14 is mounted inside the holder 11 and surrounds the drill bit 13. The seal 14 has a vertical body 14A and three flexible flaps 14B. The body 14A seals the tube 10 circumferentially 3 74417 with a double lip seal 15 and at the top it engages the annular recess 16 in the holder 11.

The protrusion in the body 14A may be arranged to engage a radial groove in the holder 11 to position the seal 14 at an angle to the tube 10. The flaps 14B are sector-shaped and engage the body 14A through narrow portions 17 for greater flexibility. At the lower ends of the edges of the flaps 14B are cams 19 which, in the "closed" position, meet each other (Fig. 2).

The flange 22 rests in the closed position against the flange 23 of the holder 11. The slope of the flaps 14B, the relatively thick cam lugs 19 at their base and the support of the flanges 22, 23 prevent the flaps 14B from rising up past the position shown on the left in Fig. 1. However, the flaps can easily bend downwards to an "open" position around the narrow portions 17 when immersed in the drilling device 12, as shown on the right in Figure 1.

During operation, the holder 11 is attached to the pipe 10, whereby a seal 14 surrounds it. The drilling device 12 is screwed into the holder 11 and the drill bit 13 passes downwards through the seal 14 to drill a hole in the pipe 10.

During drilling, the pressure inside the tube 10 may have affected the chamber 24 inside the seal 14, but the tightness is maintained by the tightness of the threads between the device 12 and the holder 11 and the tightness between the lips 15 and the tube 10 so that no significant leakage occurs.

Once the hole is made, the drilling device 12 can be pulled out and the resilience of the flaps 14B causes them to move to a "closed" position (Figure 2) where they remain tight under the pressure of the pipe and isolate the pipe pressure from the inlet of the device 12. A second device or tool (e.g., a plug or valve or sleeve) can then be introduced through the seal 14 in the same manner.

As mentioned above, the invention is obviously suitable for making a hole in any container and not only in a pipe.

Claims (3)

4 74417 Any leakage through the grooves of the drill 13 is usually small and can be further reduced by using a very short groove in the drill so that the non-grooved shank of the drill closes the hole when drilling. Various other variations and modifications may be made to the described embodiment without departing from the scope of the invention as set forth in the claims. A device for drilling a hole in a pressurized pipe or container (10), the device comprising a holder (11) for securing a drill support device (12) to the side of the container (10) and a seal (14) covering the bore opening fitted to the holder (11). , sector-shaped flaps (14B) closed by outward pressure, characterized in that the front part of the drill support device (12) acting as a drill guide is formed in the form of a sleeve to extend through the seal (14) and that the flap (14B) of the seal (14) surrounds them an integral annular circumferential seal (14A) between the holder (11) and the surface of the container, wherein the circumferential seal (14A) within the holder (11) forms a chamber (24) with the surface of the container, and each flap (14B) has a shoulder (22) , which in the closed position of the seal (14) rests against the annular abutment surface (23) of the holder (11). Device according to Claim 1, characterized in that the abutting edges (19) of the sealing flaps (14) are reinforced with flanges. Device according to Claim 1, characterized in that the circumferential seal (14A) is connected to the sealing flap (14B) by narrow flexible parts (17).