RU207410U1 - DEVICE FOR SEALING THE GAS TANK STAND WHEN REPAIRING THE LOWER BALL VALVE - Google Patents

Abstract

The utility model relates to auxiliary sealing means for ensuring the repair of the lower ball valve installed on the branch pipe of the gas sampling stand of the existing main pipeline. The technical result consists in increasing the safety of the repair of the lower ball valve. The device for sealing the gas extraction riser during the repair of the lower ball valve contains a support structure, a column and a seal assembly, while the support structure includes a lower composite support, an average composite support, a middle one-piece support, an upper support with a jack attached to it and two threaded guides elements made in the form of pins with washers and nuts on both sides of the supports, placed by means of axial channels made in them on guide threaded elements with the possibility of their translational movement by rotating the nuts; the column includes a hollow rod, on the lower section of which an internal thread, an external tapered stop, a ledge, longitudinal grooves and an internal groove with an O-ring are made; inside the rod there is a one-piece screw, in the lower part of which a transverse hole and an external thread are made with the possibility of mating with the internal thread of the rod, and at the lower end of the screw there is a multi-row annular sealing seal and a movable cone stop with a pin; the lower composite support is made of a base and a lining fastened to each other, on top of which stops with cylindrical heads are installed, while the base and the lining have a common hole, inside which adjusting half rings are installed; four guide bushings are rigidly installed in the middle one-piece support; the seal unit includes a hollow body, on one side connected to a high-pressure valve, while the body on both end sides has bores of different diameters with grooves in which the sealing rings are placed. 5 ill.

Description

The utility model relates to auxiliary sealing means for ensuring the repair of the lower ball valve installed on the branch pipe of the gas sampling stand of the existing main pipeline.

Known device for changing valves at the wellhead under pressure, containing a support structure, a string and a seal assembly. In this case, the support structure includes two guiding threaded elements in the form of screws and nuts, a lower composite support in the form of a split flange, a middle composite support in the form of a split plate and an upper integral support in the form of a plate, which are placed on the guides by means of axial channels made in them. threaded elements with the possibility of their translational movement by rotating the nuts. The string includes a split hollow rod at the lower end with a packer containing elastic sealing elements, and the upper end of the hollow rod is inserted into the bore of the central axial channel of the middle composite support, a drive shaft is installed inside the hollow rod, made separable to change its length, component parts the drive shaft are interconnected by means of couplings, the lower end of the drive shaft is connected to the drive roller of the packer, and a rotation disk is fixed at the upper end of the drive shaft, the last upper component of the drive shaft is made in the form of a screw containing a thrust shoulder resting through a thrust bearing on the middle component support in the direction of the packer. The seal assembly includes a hollow body with a connecting flange corresponding to the valve flange, an annular elastic sealing element covering the hollow stem along its outer surface, a packing follower and a threaded pressure cap for compressing an annular elastic sealing element, while the hollow body is connected in series with each other high-pressure taps and a manometer (see the description of the invention to the USSR inventor's certificate No. 1756533, MKP E21B 33/03, published 23.08.1992).

The disadvantages of this known device are:

- the inability to repair the welded ball valves on the gas sampling pipes of the main gas pipelines, since the attachment point to the Christmas tree does not allow fixing the device on the pipe before the valve, and the hollow stem seal assembly does not allow sealing the known device on the pipe after the valve;

- the use of a packer design with axial compression of flat-cylindrical elastic elements does not provide reliable sealing of the valve passage channel, since the radial deformation of the elastic elements is less than the initial clearance between these elements and the channel, taken taking into account the passage of the packer through the internal "reinforcements" of the welded seams of the body of the valve being repaired to corresponding branch pipes;

- it is impossible to dismantle the lower seat of the ball valve being repaired, since there is no necessary clearance for the passage of the extractor between the column and the inner surface of the seat.

A device for sealing a pipeline when replacing a ball valve is known, comprising a body attached to the valve, a hollow rod with an external thread and a shut-off element at its end and a rod with a nut located inside the rod with the possibility of axial movement, and the nut is installed with the possibility of contact with the end of the rod at the end of the rod opposite to the shut-off body, while the device is equipped with a guide sleeve with an internal thread, fixed in the body by a lock for the axial position of the sleeve, and a disc element mounted on the inner end of the rod, the shut-off body is made in the form of a collet bush surrounded by an elastic sealing ring , a hollow rod with a rod is screwed into the guide sleeve, and the disc element is installed with the possibility of contact with the inner surface of the collet sleeve, a drain hole is made in the body, plugged with a threaded bushing (see the description of the invention to the USSR author's certificate No. 1560867, IPC F16K 43/00, published 04/30/1990).

The disadvantage of the known device is that it is capable of sealing only at a low pressure of the medium, since its design does not contain elements that compensate for the axial force from the pressure of the medium in the position when the body of the device and the valve to be replaced are dismantled (except for the friction force of the elastic sealing ring on the inner surface of the pipeline , which is limited by the permissible contact stresses and the coefficient of friction of the corresponding surfaces).

The closest technical solution, chosen as a prototype, is a device for sealing a pipeline during the repair of a ball valve under pressure, containing a support structure, a column and a seal assembly, while the support structure includes two guiding threaded elements with nuts, a lower composite support, an average a composite support and an upper one-piece support, which, by means of axial channels made in them, are placed on the guide threaded elements with the possibility of their translational movement by means of rotation of the nuts, the column includes a hollow rod, inside which a one-piece screw is located, at the lower end of which a sealing seal is installed and a movable stop, the seal assembly includes a hollow body, the cavity of which is connected to a high-pressure tap, threaded guiding elements are made in the form of studs with washers and nuts on both sides of the supports, an internal thread, an external tapered stop and an internal groove with a sealing ring, an external thread is made in the lower part of the screw, mating with an internal thread of the rod, a sealing seal is made with internal tapered surfaces, a movable conical stop is made with an internal groove in which an sealing ring is installed, a transverse hole is made at the very end of the screw and the thread on which a nut with two washers is screwed and locked with a pin for fixing a movable conical stop, a ledge and longitudinal grooves are made on the outer surface of the lower section of the rod, the sealing unit of the rod and the upper branch pipe of the valve is made as a single one, having a body in the form of a glass with two side holes, coaxially with which two nozzles are welded, on one of which a high-pressure tap is installed on a tapered thread, and on the other a plug is installed on a tapered thread, while the glass has bores of different diameters on both sides, grooves are made in the middle of which and sealing rings are placed in them,the lower support consists of four bolts with washers and nuts of a base and a lining, on top of which four stops with cylindrical heads are installed on the thread, while inside the central hole of the base and lining on the screws there are adjusting half rings (see. description of the utility model to patent No. 121025, IPC F16K 43/00, published 10.10.2012).

The disadvantage of the closest analogue is the low safety of repairing a ball valve, due to the following reasons:

- when repairing the lower ball valve, to move the upper support, it is necessary to turn two nuts simultaneously under a heavy load, which leads to rapid wear and failure of the thread of the guide pins and nuts, an increase in the likelihood of destruction of the support structure, and a decrease in the safety of repair work;

- when repairing the lower ball valve when moving the upper support with the column to the working position, strict adherence to the horizontal position of the upper support is required throughout the entire process of bringing the device to the working position. Violation of the horizontal support can lead to jamming of the mating elements of the device, an increase in the risk of gas release into the working area due to the skew of the sealing elements and reduces the safety of repair work;

- when repairing the lower ball valve, the column sealing element has a large contact surface, as a result of which, to seal the gas pipeline, large efforts are required that occur in the threaded connection of the column, and high-quality surface preparation is required for the installation of the sealing element, which increases the risk of gas release into the working area , due to depressurization of the gas extraction riser branch pipe and a decrease in the safety of repair work;

- when repairing the lower ball valve, the cup seal assembly has one O-ring. Together with the low surface quality and possible deviations of the geometric parameters of the cross-section of the outer surface of the gas extraction riser pipe, it significantly increases the risk of gas release into the working area and reduces the safety of repair work.

The technical problem, the solution of which was provided by the claimed utility model, is the creation of a rational, reliable and safe device for repairing the lower ball valves of the gas sampling riser on existing main pipelines under pressure without interrupting gas transportation, in which, due to the fact that the device is equipped with a support with a jack, a multi-row O-ring seal, additional O-rings and guide bushings, it is possible to safely and safely use the device for sealing the gas extraction riser when repairing the lower ball valve.

The technical result obtained when using the claimed utility model is to improve the safety of the repair of the lower ball valve.

The technical result is achieved by the fact that the device for sealing the gas extraction riser during the repair of the lower ball valve, comprising a support structure, a column and a seal assembly, while the support structure includes a lower composite support, a middle composite support, a middle one-piece support and two guiding threaded elements made in the form of pins with washers and nuts on both sides of the supports, placed by means of axial channels made in them on the guide threaded elements with the possibility of their translational movement by means of rotation of the nuts; the column includes a hollow rod, on the lower section of which an internal thread, an external tapered stop, a ledge, longitudinal grooves and an internal groove with an O-ring are made; inside the rod there is a one-piece screw, in the lower part of which a transverse hole and an external thread are made with the possibility of mating with the internal thread of the rod, and a sealing seal and a movable cone stop with a pin are installed at the lower end of the screw; the lower composite support is made of a base and a lining fastened to each other, on top of which stops with cylindrical heads are installed, while the base and the lining have a common hole, inside which adjusting half rings are installed; the seal unit includes a hollow body, on one side connected to a high-pressure tap, while the body on both end sides has bores of different diameters with grooves, in which one sealing ring is placed, according to the utility model, the device contains an upper support fixed to it jack, four guide bushings are rigidly installed in the middle one-piece support, the sealing seal is made of a multi-row annular, and the seal assembly contains additional sealing rings.

The safety of repairing the ball valve is achieved by the fact that the column is moved by a jack, the new form of seal reduces the force on the handle of the wrenches used to tighten the seal and reduces wear on the thread of the column, the seal unit body has bores of different diameters on both sides, in the middle of which there are 2 grooves and they contain 4 O-rings, and four guide bushings are rigidly mounted in the middle one-piece support.

The essence of the claimed utility model is illustrated by drawings, where

in fig. 1 - shows a device for sealing the gas extraction riser during the repair of the lower ball valve, assembly drawings of the main view with a longitudinal section;

in fig. 2 - shows a device for sealing the gas extraction riser during the repair of the lower ball valve, side view assembly drawing;

in fig. 3 - also, a column, an assembly drawing with a longitudinal section;

in fig. 4 - also, a single seal assembly, an assembly drawing with a longitudinal section;

in fig. 5 - also, lower support, assembly drawing, top view.

In the figures, the positions are indicated as follows:

1 - supporting structure,

2 - column,

3 - seal assembly,

4 - hairpin,

5 - washer,

6 - nut,

7 - lower composite support,

8 - middle composite support,

9 - bolt,

10 - washer,

11 - nut,

12 - middle one-piece support,

13 - guide sleeve,

14 - glass,

15 - bolt,

16 - upper support,

17 - jack,

18 - hollow rod,

19 - internal thread,

20 - tapered stop,

21 - inner groove,

22 - rubber ring,

23.one piece screw,

24 - external thread,

25 - multi-row ring seal,

26 - movable tapered stop,

27 - washer,

28 - inner groove,

29 - rubber ring,

30 - transverse hole,

31 - thread,

32 - nut,

33 - pin,

34 - longitudinal groove,

35 - ledge,

36 - crane under repair,

37 - glass,

38 - crane,

39 - side hole,

40 - branch pipe,

41 - cork,

42 - boring,

43 - boring,

44 - groove,

45 - groove,

46 - sealing ring,

47 - a sealing ring,

48 - base,

49 - pad,

50 - bolt,

51 - washer,

52 - nut,

53 - emphasis,

54 - cylindrical head,

55 - base hole,

56 - pad,

57 - adjusting half ring,

58 - countersunk screw,

59 - groove,

60 - biscuit,

61 - supporting part,

62 - thread,

63 - nut

64 - cut

65 - gas sampling pipe,

66 - section of the gas sampling pipe,

67 - handle.

According to the utility model, the device for sealing the gas extraction riser during the repair of the lower ball valve (see Fig. 1) contains a support structure 1, a column 2 and a seal assembly 3.

The support structure 1 includes two guiding threaded elements in the form of pins 4 with washers 5 and nuts 6, a lower composite support 7, an average composite support 8 in the form of two identical parts, which are interconnected by two bolts 9 with washers 10 and nuts 11, and the middle one-piece support 12 with welded guide bushings 13, on the support 12 a glass 14 is fixed with bolts 15, an upper support 16 with a fixed jack 17 is installed in the upper part of the pins 4 (see Fig. 2), the support 16 is fixed with nuts 6 with washers 5, with In this case, the supports 7, 8 and 12, by means of axial channels made in them, are placed on the pins 4 with the possibility of their translational movement by means of the rotation of the nuts 6.

Column 2 includes a single hollow rod 18 (see Fig. 3), on the lower section of which there is an internal thread 19, an external tapered stop 20 and an internal groove 21 in which a rubber ring 22 is installed. A one-piece screw 23 is installed in the hollow rod 18 , on the lower section of which an external thread 24 is made to interact with an internal thread 19 of the rod 18. At the lower end of the screw 23 there are a multi-row annular sealing seal 25, a movable conical stop 26 and two washers 27. The stop 26 is made with an internal groove 28, in which is fitted with a rubber ring 29. At the lower end of the screw 23, a transverse hole 30 and a thread 31 are made, onto which a nut 32 is screwed, locked by a pin 33, to fix a movable cone stop 26. On the outer surface of the lower section of the hollow rod 18, longitudinal grooves 34 are made to accommodate extractors (not shown in the drawing) of the lower seat of the ball valve being repaired and a ledge 35 for the stop of the middle support 8 when removing from the column and replacement of parts of the crane being repaired 36.

The seal assembly 3 (see Fig. 4) includes a hollow body in the form of a cup 37, the cavity of which is connected to a high-pressure tap 38. The glass 37 is made with two lateral holes 39, coaxially with which two branch pipes 40 are welded, on one of which a high-pressure tap 38 is installed on a tapered thread, and on the other a plug 41 is installed on a tapered thread. In this case, the glass 37 has bores 42 on both sides and 43 of different diameters, in the middle of which two grooves 44 and 45 are made and in them O-rings 46 and 47 are placed.

The lower support 7 includes a base 48 (see Fig. 5) and an overlay 49, which are fastened together by four bolts 50 with washers 51 and nuts 52. Four stops 53 with cylindrical heads 54 are mounted on the base and the overlay on top of the thread. inside the central hole of the base 55 and the lining 56, adjusting half rings 57 are installed, secured by screws 58 with a countersunk head.

To fix the hollow rod 18 from turning, together with the screw 23, two grooves 59 are made at its upper end, in which crackers 60 are placed, which are welded to the support part 61 of the upper support 12. In this case, a thread 62 is made in the upper part of the screw 23, onto which is screwed nut 63. On the upper end of the screw 23, a cut 64 is made for a wrench.

The device for sealing the pipeline when repairing the lower ball valve works as follows:

The upper part of the gas sampling pipe 65 (hereinafter the upper pipe) above the faulty ball valve 36 is cut off by a sparkless method (a hacksaw for metal or a pipe cutter) to the required length. The upper end of the branch pipe is processed from the inside and outside to pass the sealing seal 25 of the column 2 through the bore 43 of the cup 37 of the single seal assembly 3. On the section of the gas sampling pipe 66, cleaned from insulation, below the faulty ball valve 36, a lower composite support 7 is installed with the placement of the cylindrical heads 54 of the stops 53 in the groove of the lower half-body of the ball valve 36. The base 55 and the trim 56 with pre-installed adjusting half rings 57 (to match the outer diameter of the branch pipe 65) are connected by bolts 50 with washers 51 and nuts 52. In the holes of the base 55, studs 4 of the required length with washers 5 and nuts 6. Column 2 is installed inside the upper branch pipe 56 until it stops in the ball of the closed ball valve of the valve being repaired. On top of the column 2 and the branch pipe 65, a single seal assembly 3 is installed until the end of the bore 43 of the cup 37 stops at the end of the upper branch pipe 65. In this case, if there is no leakage through the ball valve of the valve being repaired, the valve 38 can be closed; if there is a leak, the valve must be open. On top of the column 2 and pins 4 are installed and connected by bolts 9 with washers 10 and nuts 11, two parts of the middle composite support 8, which are pressed against the bottom of the glass 37 of a single seal assembly 3 and are counterbalanced by the rotation of nuts 6 with washers 5. On the pins 4 and the screw 23 protruding from the rod 18 of the column 2 is installed the upper support 12 with the placement of its cracks 60 in the grooves 61 of the rod 18 and slightly pressed down with the stud nuts 6 with washers 5. In the upper part of the studs 4 the upper support 16 is installed using nuts 6 and washers 7 , a jack 17 is fixed on the support 16 in a compressed state, which abuts against the glass 14.

The ball valve of the valve under repair 36 opens and by rotating the handle 67 of the jack 17 above the middle support 8, the column 2 moves downward by the amount of its working stroke, at which the sealing multi-row annular seal 25 of the column 2 is installed at the level of the bore of the branch pipe of the lower half-body of the valve being repaired 36. In this position of the column 2, when rotating with a wrench beyond the edges 64 of the screw 23 counterclockwise, the repaired ball valve 36 is sealed by compressing the sealing multi-row annular seal 25 between the cone stop 20, the movable cone stop 26 and the inner wall of the branch pipe of the lower half-body of the valve 36. To relieve pressure in the cavity above the multi-row annular seal 25 and checking the degree of sealing, the valve 38 of the single seal assembly 3 opens. If the gas outflow from the valve 38 occurs, then the screw 23 is turned until the gas outflow from the open valve 37 stops. After sealing, the support with the jack 17 is removed and the support 12 is locked with nuts 6 with washers 5. In this position, the nuts tightening the half-body of the valve being repaired 36 are unscrewed and stud nuts 6 above the middle support 8, nuts 11 with washers 10 are also unscrewed and removed, connecting both parts of the middle support, which are removed from the studs 4 of the support structure 1. After that, it moves up the rod 18 and is removed from the upper branch pipe 65, the glass 37, after whereupon the upper half-body with a sealing seat, a special sealing ring, a ball plug and a spindle with a sleeve of the crane being repaired move up the rod. All raised parts are lifted up to the stop in the middle support 12 and are attached to it using a knitting wire or a chain with hooks. Using the hooks of the extractor, placed in the longitudinal grooves 34 on the outer surface of the lower part of the rod 18 of the column 2, the sealing seat with springs is removed from the lower half-body of the crane 36 to be repaired. After that, the middle support 8 is again set to the lower position with an emphasis on the ledge 35 of the column 2, it is pressed against it and is locked by stud nuts 6 with washers 5. Then the stud nuts 6 with washers 5 are unscrewed and removed over the middle support 12, which is removed from the screw 23 of the column 2 and the studs 4. After that, a single seal assembly 3 is removed, the upper half-body with a saddle , special O-ring, ball plug, stem with bushing and lower seat of the valve under repair 36.

After cleaning, inspection and, if necessary, replacement, units and parts of the ball valve are installed on the column on top of the middle support 8 in reverse order. Then a single seal assembly 3 and a middle support 12 are installed, which is pressed to the upper end of the rod 18 by nuts 6 with washers 5. After that, the assemblies and parts of the ball valve, together with the seal assembly 3, are raised above the middle support 8, which is dismantled from the lower position when it rests against the shoulder 35. The units and parts of the ball valve being repaired are installed in the working position, the half-bodies of which are pulled together with standard studs and nuts. A single seal assembly 3 is installed on top with an emphasis on the end face of the upper branch pipe 65 and then the middle support 8 in its upper position with its pressing against the glass 37 with nuts 6 with washers 5. By turning the screw 23 clockwise, the movable stop 26 is removed from the fixed stop 20, sealing the multi-row annular seal 25 is released and, due to its elastic properties, takes its initial position. A nut 63 is screwed onto the screw 23 of the column. When the nuts 6 above the middle support 12 are unscrewed under the action of gas pressure in the gas sampling pipe, the column 2 with a multi-row annular seal 25 moves upward and is located above the ball valve. After which the repaired ball valve 36 is closed. At low pressure in the gas sampling pipe, the column 2 moves upward by means of uniform rotation of the nuts 6 installed under the middle support 12. Control of the sealing and depressurization processes (multi-row ring seal operation 25), as well as pressure relief at various stages, is carried out by opening the valve 38 of a single unit 3 seals.

The device is dismantled from the gas sampling standpipe of the existing main gas pipelines after the pressure is released when the valve 38 is opened, and there is no further flow, as well as after checking the tightness of the repaired ball valve by the gate, connector and spindle.

Claims (1)

A device for sealing the gas sampling riser during the repair of a lower ball valve, containing a support structure, a column and a seal assembly, while the support structure includes a lower composite support, an average composite support, a middle one-piece support and two guiding threaded elements made in the form of studs with washers and nuts on both sides of the supports placed by means of axial channels made in them on guide threaded elements with the possibility of their translational movement by rotating the nuts; the column includes a hollow rod, on the lower section of which an internal thread, an external tapered stop, a ledge, longitudinal grooves and an internal groove with an O-ring are made; inside the rod there is a one-piece screw, in the lower part of which a transverse hole and an external thread are made with the possibility of mating with the internal thread of the rod, and a sealing seal and a movable cone stop with a pin are installed at the lower end of the screw; the lower composite support is made of a base and a lining fastened to each other, on top of which stops with cylindrical heads are installed, while the base and the lining have a common hole, inside which adjusting half rings are installed; the seal unit includes a hollow body, on one side connected to a high-pressure valve, while the body on both end sides has bores of different diameters with grooves, in which one sealing ring is placed, characterized in that the device contains an upper support fixed to with a jack, four guide bushings are rigidly installed in the middle one-piece support, the sealing seal is made of a multi-row annular, and the seal assembly contains additional sealing rings.

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