RU2087891C1 - Gear to take samples out of pipe-line - Google Patents

Abstract

FIELD: measurement technology, taking samples of liquid out of pipe-line working under pressure. SUBSTANCE: tube T to take samples is installed in cross-section of pipe-line. One end of it has drain hole and the other end of it is put into gland unit with shut-off member. Tube has translation drive in the form of power cylinder and is mounted inside its case. Piston of power cylinder is made fast to tube. Piston, space above piston and pipe union of pipe-line are interconnected by means of system of pulse tubes and shut-off cocks forming system controlling translation of tube. One of pulse tube is joined to pipe union with the aid of detachable joint. Gear is fitted with measuring scale mounted on case of power cylinder and indicator with pointer made fast to tube. Limiting collar are positioned ahead of piston and after it. EFFECT: improved operational convenience and reliability. 3 cl, 1 dwg

Description

 The invention relates to the oil industry, namely: to devices for sampling liquid from an oil pipeline operating under pressure.

 A device for sampling from a pipeline is known, comprising a sampling element mounted for movement in the cross section of the pipeline and made in the form of a tube having a drain hole at one end and a second end mounted in a stuffing box rigidly connected to the pipe fitting with a locking element, and a drive to move the tube in the form of a power cylinder. However, the known device requires a pneumatic system for the mechanism for moving and purging the body of the sampling tube, which leads to a complication of the design and maintenance, to the need to have a source of air gas and means for supplying it to the movement mechanism. The sampling unit and the movement mechanism (pneumatic system) are structurally independent, which complicates the design and increases the total weight of the device. The disadvantage of this device is that it is equipped with a measuring device indicating the movement and location (point) of the sampling hole (slit) of the sampling tube in the cross section of the pipe when the sampling element is moving up or down and therefore this device does not allow sampling if necessary any given cross-sectional point of the pipe.

 The technical result of this device is to simplify its design, to provide sampling at any given point in the cross section of the pipeline and to improve the quality of representativeness of the sample.

 To achieve a technical result in a device for sampling from a pipeline containing a sampling element mounted for movement in the cross section of the pipeline and made in the form of a tube having a drain hole at one end and the second end mounted in a stuffing box rigidly connected to the pipe fitting with a locking element element, and a drive for moving the tube in the form of a power cylinder, according to the invention, the tube is installed in the power cylinder, and the piston is rigidly fixed to the tube, m the sub-piston and supra-piston cavities and the pipe fitting are interconnected by a system of impulse tubes and shut-off valves forming a tube movement control system, while the impulse tube is connected to the nozzle by means of a detachable connection. The device is equipped with a measuring scale mounted on the housing of the power cylinder, and a pointer with an arrow rigidly connected to the tube, and is also equipped with restrictive collars rigidly fixed to the tube in front of the piston and after it.

 The drawing shows a General view of the device.

 The device comprises a sampling element installed with the possibility of movement in the cross section of the pipeline 1 and made in the form of a tube 2 having a drain hole and a valve 3 at one end. The second end of the tube 2 is bent and installed in a stuffing box with a locking element 4. The stuffing box is through a locking element 4 is rigidly connected to the fitting 5 of the pipeline 1. The tube 2 has a displacement drive in the form of a power cylinder 6, the piston 7 of which is rigidly fixed to the tube 2. The latter is installed in the power cylinder 6. On the tube 2 before shnem 7 and thereafter secured restrictive ribs 8 and 9, respectively. The piston cavity 10, the over-piston cavity 11 and the nozzle 5 of the pipe 1 are interconnected by a system of impulse tubes 12, 13, 14, 15 and shut-off valves 16, 17, 18, 19, 20, forming a control system for the movement of the tube 2. After the shut-off valve 20, a quick-disconnect valve is installed a nut 21 for connecting the impulse tube 13 to it. The device is equipped with a measuring scale 22 mounted on the housing of the power cylinder 6, and a pointer with an arrow 23, rigidly connected to the tube 2. On the housing of the power cylinder 6, a guide bracket 24 is fixed, fixing the tube 2 and pre rotating the tube 2 about its rotation axis.

 The impulse tube 12 is connected to the capacity 25 of an additional outlet pipe 26.

 In the locking element 4, a die 27 is installed.

 Sampling is carried out in the following sequence.

 Open the locking element 4, valves 18 and 20. Then slowly open the valve 16. In this case, the liquid from the pipeline 1 as the valve 16 opens through the pipe 13 under pressure in the pipe 1 enters the over-piston space 11 of the cylinder 6 and moves the piston 7 and is rigidly connected with it, the sampling tube 2 is down due to the fact that the force acting on the piston 7 above is greater than the force acting on the tube 2 below, since the cross-sectional area of the piston 7 is larger than the cross-sectional area of the tube 2. Moreover, the contents in the sub-piston space 10 through the valve 18 strav It flows into the tube 26 and into the container 25. When the sampling end of the tube 2 reaches a predetermined point in the pipeline 1, close the valve 16, open the valve 3, discharge liquid into the container 25 from the pipe 2 in the volume of the pipe 2 and then take a sample into the vessel and close the valve 3 .

 To take a sample at the next cross-sectional point of the pipeline 1, the valve 16 is slowly opened and the operation is repeated in the described sequence.

 After sampling at all given points, the device is returned to its original position. To do this, the valve 3 and the valves 18 and 16 are closed. Open the valve 19. In this case, the tube 2 under pressure from the pipeline 1 moves up to the stop shoulder 8 in the upper stuffing box. The contents in the above-piston space 11 of the cylinder 6 are vented through the valve 19 into the container 25. In the case when the pressure in the pipe 1 due to the small cross section of the pipe 2 is insufficient to overcome the friction forces of the piston 7 in the cylinder 6 and the pipe 2 in the stuffing box and move the pipe 2 upwards, then the movement of the tube 2 is controlled using the valve 17, with the valve 20 open, the valve 17 is slowly opened. In this case, the liquid (gas) from the pipeline 1 under pressure enters the under-piston space 10 of the cylinder 6 and moves the piston 7 with the tube 2 up to emphasis b urtica 8 in the upper gland.

 Close the taps 17, 19 and 20 and the locking element 4, open the valve 3 and the valve 18 and relieve pressure from the tube 2 and the piston space 10 of the cylinder 6. Close the valve 18 and valve 3.

 The device is restored to its original position.

Claims (3)

 1. A device for sampling from a pipeline containing a sampling element mounted with the possibility of movement in the cross section of the pipeline and made in the form of a tube having a drain hole at one end and a second end mounted in a stuffing box rigidly connected to the pipe fitting with a locking element, and an actuator for moving the tube in the form of a power cylinder, characterized in that the tube is installed in the power cylinder, and the piston is rigidly fixed to the tube, and the under-piston and over-piston cavities and tutser conduit interconnected system impulse lines and stopcocks forming tube displacement control system, the pulse tube is connected with a connection via a releasable connection.  2. The device according to claim 1, characterized in that it is equipped with a measuring scale mounted on the housing of the power cylinder, and a pointer with an arrow rigidly connected to the tube.  3. The device according to claim 1, characterized in that it is equipped with restrictive shoulders rigidly fixed to the tube in front of the piston and after it.