RU2701756C1 - Test bench for internal pressure testing of deepwater apparatus modules - Google Patents

Abstract

FIELD: test equipment.

SUBSTANCE: invention relates to production of process modules of deep-water apparatuses, namely, to equipment for hydraulic tests for strength and tightness. Proposed test bench comprises sealing heads arranged to displace thereat, supports for tested module, having adjustable mounting mechanisms, means of controlling parameters and feeding working fluid into tested cavity, drain system for draining of possible leaks of working fluid. Stand is made in the form of a bearing frame consisting of two side walls, which are connected from above by two bridges, on which guides are mounted to move two vertically arranged platforms installed parallel to each other on self-propelled trucks, at that, through the said walls pass the screw stops intended for fixing the platforms on the end surfaces of the module, and the supports are made in the form of slip trolleys, rail tracks for which are located perpendicular to the stand axis, the sealing heads are made in the form of flanges of certain diameters, installed on the platforms towards each other along the stand axis and the holes of which have inwardly directed cone sealing surfaces, wherein they are equipped with sealing rings of round section, installed during tests on top of housing module in flange end stop and with additional fixation of sealant.

EFFECT: improving processability and efficiency of hydraulic tests, reducing labor intensity of installation and removal of reusable sealing covers, saving energy resources.

6 cl, 5 dwg

Description

The invention relates to the production of technological modules of deep-sea vehicles, namely, equipment for conducting hydraulic tests for strength and tightness.

Technological module (TM) - welded sections of the main hull structures of deep-sea vehicles. The outer diameter of the main body of ТМ can reach 9 ÷ 12 m, and the length - 21.5 ÷ 35.1 m. The mass of these ТМ with welded saturation can be up to 1400 tons. In this case, the test pressure can reach up to 6.0 MPa.

The invention can be used both in the construction and repair of such bulky TM deep-sea vehicles and other large-sized sealed enclosures and devices operating under pressure.

The resource and high reliability of deep-sea vehicles depends on the quality of manufacturing TM cases, which is checked by instruments and non-destructive testing methods and hydraulic tests for strength and tightness. All these requirements are set forth in the relevant regulatory and design documents.

Particularly time-consuming are hydraulic tests of TM for strength and tightness. It is known that these tests are carried out by enterprises of the shipbuilding industry on slipways (slipways), where the main body is directly assembled on slipways, on which they carry out the necessary technological movements along the slipways, and hydraulic tests are also carried out here.

To carry out hydraulic tests, special technological plugs are made, of appropriate size and strength, which are welded to both ends of the TM case, connect the TM test cavity with a high-pressure hydraulic station, mount a drainage system for draining possible leaks, and perform hydraulic tests in accordance with the technological process. After that, the technological plugs are cut and the TM is prepared for docking with the main body of the deep-sea vehicle.

All of these works take a significant slipway time and, accordingly, affect the duration of construction of the produced deep-sea vehicles.

When hydraulic tests of the TM case are taken out of the slipway zone, it is possible to increase its throughput and, consequently, increase the number of deep-water vehicles produced, but for this it is necessary to organize a special section for conducting hydraulic tests of TM cases, which should be equipped with a test bench for strength of large TM cases and tightness, other necessary technological equipment and tools.

A known utility model according to the patent of the Russian Federation No. 91431 for a hydraulic stand for testing deep-sea vehicles by external pressure.

A hydraulic stand for the bodies of deep-sea apparatus containing a sealed reservoir with a lid and a seal, a flange with a seal to seal the end face of the tested product, means for supplying working fluid to the reservoir, and means for controlling parameters. It is equipped with a second flange with a seal for sealing the second end of the test product, a central stand between the flanges and plugs for sealing the side openings of the test product, while the working fluid in the tank is tinted, for example, with potassium permanganate. However, the design of the bench of the specified analog does not provide hydraulic tests of TM internal pressure.

The invention is known according to the patent of the Russian Federation No. 2503943, relating to rocket technology, namely to bench equipment, designed for hydraulic testing of rocket engine bodies for internal pressure.

A test bench for large-sized housings for internal pressure, comprising a rear flange unloading device, which consists of a cylinder mounted on the rear flange, and a piston having a stop connected to the power floor of the stand and contains a nozzle body simulator and an unloading device with two pistons and different cylinders diameters, a piston of a smaller diameter is located in a cylinder made in a piston of a larger diameter, the cylinder of which is connected to the rear flange of the housing through a simulator of the nozzle body.

However, the design of the bench of the indicated analogue will also not be able to provide hydraulic tests of the TM, the indicated weight and size characteristics, and also require the creation of a fundamentally new design of the bench.

The invention is known according to the patent of the Russian Federation No. 2184946. This invention relates to the field of testing equipment, in particular for determining the tightness of pipes.

A device for testing pipes for leaks, consisting of bases, sealing heads, one of which is installed with the possibility of axial movement, the drive of the sealing head, supports for the test pipe, made in the form of lunettes, having adjustable supporting and clamping surfaces connected to hydraulic cylinders operating in a single hydraulic system, the pressure in which is regulated by a pressure control sensor according to the signals of the linear position sensors in contact with the end of the pipe under test.

Linear position sensors contain test pressure feed switches that interrupt the test when the pipe end reaches the position corresponding to the onset of plastic deformation in any of its cross sections.

The design of this device also can not provide hydraulic tests of TM, the specified weight and size characteristics, for strength and tightness, because efforts on sealing plugs can reach up to 70,000 t / s, which requires the creation of a fundamentally new power stand construction.

Despite these drawbacks, the invention according to patent No. 2184946 is the closest in technical essence and the achieved result, and therefore is taken as a prototype.

The objective of the invention is to develop a technologically advanced, reliable and relatively inexpensive bench operating outside the slipway zone and providing hydraulic pressure tests for internal strength and tightness of large-sized TM casings of several sizes with a significant reduction in the complexity of testing and material resources, as well as an increase in the productivity of releasing deep-sea vehicles from the slipway .

The main technical result, due to which the task is ensured, is to increase the manufacturability and efficiency of hydraulic tests due to:

- the use of reusable seals and sealing caps;

- reducing the complexity of installing and removing reusable sealing covers;

- energy saving.

Obtaining the specified technical result is provided in the test bench TM deep-sea apparatus for internal pressure, containing means for monitoring parameters and supplying the working fluid to the test cavity, a drainage system to drain possible leaks of the working fluid. The stand is made in the form of a supporting frame, consisting of two side walls, which are connected from above by two jumpers. Guides are mounted on these jumpers for moving two vertically arranged platforms mounted parallel to each other on self-propelled carts. Through the said side walls there are screw stops intended for fixing the platforms on the end surfaces of the module. Supports for the tested module are made in the form of stacking bogies, the rail tracks of which are located perpendicular to the axis of the stand. The sealing heads of the test bench are made in the form of flanges of certain diameters installed on the platforms towards each other along the axis of the test bench and the openings of which have conical sealing surfaces directed inward, while they are equipped with O-rings, which were installed during testing on top of the module body against the end of the flange end and with additional fixation with sealant.

In the particular case, between the inner surfaces of the side walls of the frame and the platforms installed liners based on jumpers.

In another particular case, the flanges have several concentric conical sealing surfaces of different diameters.

In the third particular case, said self-propelled carts have a microelectric drive.

In the fourth particular case, on the outer end of the flanges there is installed a device for removing the seal, consisting of a retaining plate, a threaded hole and a retaining screw.

In the fifth particular case, in the upper part of the flanges of the sealing heads there is a plug for bleeding air.

On the side walls of the frame there are screw stops with persistent threads and articulated supports. Screw stops are adjustable stroke and reliably perceive the compression forces in combination with articulated stops on the sealing heads that occur during hydrotesting of the internal cavity of the TM.

On the upper jumpers of the frame, rails are mounted, providing the movement of two vertically located platforms mounted parallel to each other on self-propelled carts, preferably equipped with a microelectric drive. The micro-electric drive ensures the accuracy of the platform positioning relative to the end surfaces of the module. On the platforms, sealing heads are mounted in the form of flanges, of certain diameters, installed opposite each other along the axis of the bench and the openings of which have conical sealing surfaces directed inward, while they are equipped with O-rings, which are installed during testing over the TM case at the stop of the inner end of the flanges and with additional fixation with sealant. This arrangement of platforms on the upper jumpers of the frame allows you to accurately determine the operating position of the platforms relative to the end surfaces of the TM and to absorb large loads during hydraulic tests of the TM, as well as to make precise installation by adjusting the flanges of the sealing heads relative to the end surfaces of the TM before starting the tests.

The slipway trolleys are a universal vehicle and have a wide field of application when carrying out hull-assembly and repair work at enterprises of the shipbuilding industry. They have a large carrying capacity, have devices for turning 90 ° and adjusting both in height and in the horizontal direction. They can be transported independently from the TM from the slipway to the working area of the stand, without the use of other hoisting vehicles.

To reduce the stroke length of the screw stops in the stand design, inserts between the side supporting walls of the frame and the walls of the sealing heads can be used.

Due to the fact that the TM case can consist of two concentric shells of different diameters, concentric sealing surfaces of different diameters should be provided on the platforms for this option on the platform.

An annular seal of circular cross section is mounted in the gap between the inner conical sealing surface of the flanges and the outer cylindrical surface of the TM. The remaining internal volume from the seal surface to the end surface of the TM is filled around the perimeter with sealant. This is necessary because the shell of the TM case with diameters of up to 10–12 m may have roundness deviations; therefore, for sealing the resulting gap, the most reliable is sealing with the introduction of a sealant into the gap. This sealant, when filling the working volume with liquid, will ensure that there are no leaks through the gap until the ring seal is self-installing under the action of a constant increase in pressure from the means for supplying the working fluid to the test cavity of the TM case.

A device for removing the seal after carrying out hydraulic tests is necessary, since at the maximum pressure tested, the seal can jam around the entire perimeter in the conical gap with a gain of more than 15,000 kN, which will cause difficulties when removing the seal.

In the upper part of the flanges, a plug with a gasket for air discharge can be installed, as when filling the working volume of ТМ with liquid, an air bubble may form in the upper part of the flanges of the sealing head, which can be removed through the plug hole with the gasket.

Thus, the present invention creates the possibility of creating a technologically advanced and reliable stand, working outside the zone of the slipway and providing hydraulic tests for strength and tightness of large-sized TM casings of several sizes with a significant reduction in the complexity of testing and material resources.

The invention is illustrated by the following graphic figures:

FIG. 1 - general layout of the stand;

FIG. 2 - section A - A. The working position of the technological module 1 in the stand;

FIG. 3 - the design of the platform 10;

FIG. 4 - the design of the liner 28;

FIG. 5 - view G. Section of the seal gap 16.

The test bench for large-sized TM 1 cases for strength and tightness with internal pressure is a set of equipment mounted indoors. The stand design can be assembled from welded steel and steel-reinforced concrete structures capable of withstanding significant loads of several tens of thousands of tons (Fig. 1, 2).

The stand is arranged in the form of a supporting frame 2, consisting of two side walls 3, and two upper jumpers 4. Screw stops 5 are mounted on two side walls 3. On the upper jumpers 4 are mounted guides 6. On the lower surface of the supporting frame 2, perpendicular to the axis of the stand 7 are located rail tracks 8 for stacking trolleys 9, on which the test subjects TM 1 on the lodgements are installed inside the stand in the working position (Fig. 1, 2).

Two platforms 10 are mounted on the guides 6 towards each other. Each platform 10 consists of a sealing head 11 and flanges 12 connected in one piece with it. Flanges 12 have conical sealing surfaces 13, of defined diameters 14 (Fig. 2, 3).

An O-ring 16 is mounted in the gap E, which is formed between the inner conical sealing surface 13 and the outer cylindrical surface 15 of TM 1, and the remaining internal volume from the seal 16 to the end surface 17 of TM 1 is filled around the entire perimeter with sealant 18 (Fig. 5 )

On the outer end 19 of the flange 12 having conical sealing surfaces 13, a device is mounted for removing the seal after testing. It consists of a stop bar 20, a threaded hole 21 and a stop screw 22 (Fig. 5).

In the upper part of the flange 12 there is a plug 23 with a gasket 24 for the release of an air bubble (Fig. 2).

To supply the working fluid to the test cavity of the TM 1 casing and conduct internal pressure tests, a pump station 26 is connected to the test bench through a pipeline 25, equipped with means for controlling parameters (pressure and flow rate of the working fluid) (Fig. 2).

To drain possible leaks of the working fluid during filling and testing the test cavity TM 1 in the stand provides a drainage system 27 (Fig. 2).

For movement and precise positioning on the guides 6, the platform 10 is mounted on a trolley with a micro-electric drive 28 (Fig. 1, 3).

Liners 29 can be installed between the supporting surfaces of the side walls 3 and the sealing heads 11 of the platforms 10 (Fig. 4). The position of the screw stops 5 is set to contact with the supporting surfaces of the sealing heads 11 of the platforms 10 or inserts 29 of the hinged stops 30 (Fig. 2).

The work of the test bench for large-sized TM cases for internal pressure and tightness is performed when the following steps are performed:

- conducting preparatory work;

- filling and testing the strength and tightness of the TM cavity;

- carrying out final work.

During the preparatory work, the platforms 10 are installed towards each other along the axis of the stand, while the sealing heads 11 with the flanges 12 are opposite each other, and the platforms 10 themselves are placed in the maximum possible extreme positions on the guides 6.

The screw stops 5 are in the most extended position relative to the outer surfaces of the (external) side walls 3.

TM 1 mounted on lodges 31 is transported on slipway carts 9 along slipway line 32 to the area of perpendicular rail tracks 8.

The rotation of the support wheels of the stacking bogies 9 by 90 ° and their subsequent rearrangement on the rail tracks 8 is carried out in accordance with the manufacturing process of the manufacturer. Next, the slipway trolleys 9 with TM 1 are rolled into the working area of the stand and the necessary alignment of the TM 1 in two coordinates (horizontal and vertical — the alignment of the central axis 7 of TM 1 with the axes of the flanges 12) using the corresponding mechanisms of the slipway trolleys 9.

Next, the axial installation of the inner conical sealing surfaces of the flanges 12 of the platforms 10 relative to the end surfaces of the shell 15 TM 1 using trolleys 28 is made and the gaps are fixed E. Depending on the size of the length of the housing TM 1 between the supporting surfaces of the side walls 3 and the supporting walls of the sealing heads of 11 platforms 10, liners 29 can be installed. The position of the screw stops 5 is set until the articulated stops 30 are in contact with the supporting surfaces of the sealing heads 11 or the contributions sha 29 serial adjustable torque wrench.

Installation of the seal in the gap E is carried out in the following sequence:

- from the outer end 19 of the flange 12 mount the stop screws 22 into the threaded holes 21 and set the stroke "D" (Fig. 5);

- from the inside into the gap "E" lay to the stop a set of retaining strips 20 around the entire perimeter of the gap;

- from the inside into the gap "E" lay until it stops an annular rubber seal 10;

- from the inside to the gap “E” remaining around the entire perimeter, the volume is filled with sealant 18.

Installation of the seal in the gap "E" on the inside is carried out by personnel who penetrate the internal volume of the housing TM 1 through special technological hatches (not shown).

Connect the pipeline 25 to the special technological holes TM 1 and pump station 26.

Check all the connections of the hydraulic systems, the filling and test systems, as well as the general drainage system 27 for correct assembly.

Filling of the working fluid and testing for the strength and tightness of the TM 1 cavity are carried out in accordance with the corresponding technology of the manufacturer and design documentation using a hydraulic system consisting of pipeline 25 (pressure and drain paths), as well as a pump station 26.

The final work at the end of the tests for strength and tightness of the cavity TM 1 is carried out in the following sequence:

- depressurize the hydraulic system, consisting of a pipeline 25 and a pump station 26. Screw stops 5 with hinged stops 30, set to their original position;

- make the discharge of the working fluid from the pipelines 25 and the cavity TM 1;

- if necessary, dismantle the seal 16 in the gap "E" by tightening the stop screw 22 into the threaded hole 21 on the stroke "D" and through the stop plate 20 wedge a certain section of the seal 16 in the gap "E". This operation is carried out along the entire perimeter of the gap "E" until the full wedging and removal of the seal 16.

Take to the starting position of the platform 10.

The drains of the working fluid are drained through the drainage system 27.

As a result of these operations, TM is ready for the following operations in accordance with the technological process.

Thus, the present invention provides the creation of a technological and reliable bench, which can provide increased manufacturability and efficiency of hydraulic tests outside the slipway line.

Claims (6)

1. A test bench for testing the technological modules of deep-sea apparatus for internal pressure, containing sealing heads installed with the ability to move them, supports for the tested module, having adjustable mounting mechanisms, means for monitoring parameters and supplying working fluid to the test cavity, and a drainage system for draining possible leaks working fluid, characterized in that it is made in the form of a supporting frame consisting of two side walls, which are connected from above by two jumpers, on which guides are mounted for moving two vertically arranged platforms mounted parallel to each other on self-propelled carts, with screw stops passing through the walls for fixing the platforms on the module end surfaces, and the supports are made in the form of stacking carts, rail tracks for which are perpendicular to the axis the stand, the sealing heads are made in the form of flanges of certain diameters installed on the platforms towards each other along the axis of the stand and the hole of the cat All of them have conical sealing surfaces directed inward, and they are equipped with O-rings, which are installed during testing on top of the module body against the end of the flanges and with additional fixation with a sealant. 2. The stand according to claim 1, characterized in that between the inner surfaces of the side walls of the frame and the platforms installed liners based on jumpers. 3. The stand according to claim 1, characterized in that the flanges have several concentric conical sealing surfaces of different diameters. 4. The stand under item 1, characterized in that the said self-propelled carts have a microelectric drive. 5. The stand according to claim 1, characterized in that on the outer end of the flanges there is a device for removing the seal, consisting of a retaining plate, a threaded hole and a stop screw. 6. The stand according to claim 1, characterized in that in the upper part of the flanges of the sealing head there is a plug with a gasket for bleeding air.

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