RU2262681C2 - Device for sampling liquid from pipeline - Google Patents

Abstract

FIELD: analyzing or investigating materials.

SUBSTANCE: device comprises sampling tube whose inlet openings is oriented toward the flow, flange mounted on the pipeline, valving member mounted on the flange, and chamber with a collar, mounted on the valving members. The chamber is provided with outlet branch pipe having the flange. The outlet of the sampling tube enters the chamber. The sampling tube has the mechanism for lifting and lowering. Between the pipeline and valving members is the ring that is mounted for permitting the sampling tube to pass through it and comprises conical section that co-operates with the bushing mounted on the sampling tube for permitting flexible movement. Between the valving member and chamber is the bearing ring that allows the sampling tube to pass through it and has a section made of a seat of the stop valve. The sampling tube is provided with the section made of the slide of the stop valve that cooperates with the seat of the bearing ring when the sampling member is in the bottom working position.

EFFECT: enhanced reliability.

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Description

The invention relates to technology and techniques for sampling liquid from a pipeline and can be used in oil production, oil refining and other industries where it is necessary to replace and revise a sampling element without stopping the pumping of liquid in the pipeline under pressure.

There is a method of sampling liquid from a pipeline, in which five sampling tubes are vertically placed in a pipeline, the flow parts taken through sampling tubes are combined by mixing them and the combined sample is pumped through an auxiliary pipeline for analysis to a liquid quality control unit (GOST 2517-85. Method fluid sampling from the pipeline, clause 2.1 / .1.8, clause 2.13.1.10, FIG. 18). A device for implementing this method is known, including a sampling element of five sampling tubes mounted vertically along the diameter of the pipeline with inlet openings facing the flow. At the same time, the opposite ends of the tubes enter the mixing chamber (outlet), from which the sample is sent for analysis to the quality control unit.

The disadvantage of the analogue is the impossibility of replacing and revising the sampling element without stopping the pumping of liquid in the pipeline under pressure.

The closest in technical essence is the method of sampling liquid (RF patent RU 2144179, class 7 G 01 N 1/10, 1999) from the pipeline, in which the sampling tube is placed in the pipeline through the stuffing box and stop valves with the inlet opening facing the flow. A device is known (patent of the Russian Federation RU 2144179, class 7 G 01 N 1/10, 1999) for implementing this method, including a sampling tube installed by the inlet facing the flow, a flange mounted on the pipeline, shutoff valves mounted on the flange, chamber with gland mounted on shutoff valves.

The disadvantages of the prototype:

- vibration of the sampling tube, caused by fluctuations in the pumping pressure of the liquid and the absence of a second support of the sampling tube (the first support is the stuffing box), leads to a violation of the sealing of the stuffing box;

- the need to disconnect the tap line from the sampling tube in case of replacement or revision.

The technical result of this invention is to increase the reliability of the gland, providing ease of installation of the device for sampling and its maintenance.

Fixation of the sampling tube in the area between the pipeline and the shutoff valves eliminates the possibility of vibration. The supply of the combined sample into the chamber allows for the possibility of stationary connection with the outlet line, which eliminates the need to disconnect the outlet line from the sampling tube in case of its replacement or revision.

To achieve a technical result, a device for sampling liquid from a pipeline, comprising a sampling tube mounted inlet towards the flow, a flange mounted on the pipeline, shutoff valves mounted on the flange, a chamber with an oil seal mounted on shutoff valves. According to the invention, a ring is arranged between the pipeline and the shutoff valves with the possibility of passing a sampling tube through it and containing a conical guide part interacting with a sleeve mounted on the sampling tube with the possibility of elastic movement. In addition, a support ring is mounted between the shutoff valve and the chamber with the possibility of passing a sampling element through it and containing a section made in the form of a shut-off valve seat, and the sampling tube has a section made in the form of a shut-off valve spool interacting with the support ring seat at the lower working the position of the sampling tube, the outlet opening of which goes into the chamber containing the outlet pipe with the flange, in addition, the device contains a mechanism for raising and lowering the sampling th tube.

The method is implemented as follows.

In the initial position, the sampling tube is placed in the chamber through the gland with the shut-off valves closed (liquid does not enter the chamber from the pipeline). After the shutoff valve is opened (liquid from the pipeline begins to flow into the chamber both through the central hole of the sampling tube and bypassing it), the sampling tube is lowered into the pipeline with inlet openings towards the flow using the mechanism. Moreover, with the placement of the sampling tube in the pipeline at the required level, liquid flow from the pipeline towards the chamber, bypassing the central hole of the sampling tube, is excluded, and the combined sample from the sampling tube is sent to the chamber, from where it is supplied to the discharge line, in addition, the sampling tube fixed in the area between the pipeline and valves.

The invention is illustrated in the drawing.

The drawing shows a variant of the inventive device for sampling liquid in a pipeline under pressure.

The device includes a sampling tube 1, containing a sampling part 2, oriented by sampling holes towards the fluid flow in the pipe 4 and a part made in the form of a spool 3; the sampling tube 1 is installed in the pipe 4 through the gland 5, the chamber 6, the support ring 7, having a section made in the form of a valve seat 8, shutoff valves 9, ring 10, the conical surface of which is mated with the sleeve 11, interacting with the elastic element 12; the chamber 6 has an exit to the flange 13 connected to the outlet line; the sampling tube 1 is connected to the lifting and lowering mechanism 14.

A device that implements the proposed method works as follows.

In the initial position, the sampling tube 1 is located in the chamber 6. After the shut-off valve 9 is opened, the sampling tube 1, using the mechanism 14, moves down to the operating position, which coincides with the moment of interaction of the spool part 3 with the portion 8 of the support ring 7 (liquid is excluded from the cavity of the shut-off valve into the chamber cavity). At the same time, the elastically movable sleeve 11 interacts with the conical surface of the ring 10, thereby providing additional support to the sampling tube 1, which experiences lateral loading from the side of the fluid flow. In this case, part of the liquid transported through the pipeline 4, under excessive pressure, enters through the intake openings in the intake part 2, after which the combined sample enters the chamber 6, then through the flange 13, into the discharge line. The reliability of the combined sample is ensured by the necessary degree of sealing of the interface between the spool 3 and the seat 8, which in turn is provided both by the lowering mechanism and the fact that the force acting on the spool 3 from the side of the chamber 6 is greater than from the side of the shutoff valve 9 due to differences in the areas perceiving the fluid pressure after the spool part 3 enters into interaction with the portion 8 of the support ring 7.

Thus, the claimed method of sampling and a device for its implementation provide the reliability of the combined sample, the ability to replace and revise the sampling tube without stopping the pumping of fluid in the pipeline, ease of installation and operation of the device.

Claims (1)

A device for sampling liquid from a pipeline, comprising a sampling tube mounted inlet to the flow, a flange mounted on the pipeline, shutoff valves mounted on the flange, a chamber with an oil seal mounted on shutoff valves and having an outlet pipe with a flange, an outlet opening of the sampling tube goes into the chamber, and the sampling tube has a lifting and lowering mechanism, characterized in that a ring with the possibility of passage is located between the pipeline and the stop valves through it a sampling tube and containing a conical part interacting with a sleeve mounted on the sampling tube with the possibility of elastic movement, in addition, a support ring is mounted between the stop valves and the camera with the possibility of passage of a sampling tube through it and containing a section made in the form of a shut-off valve seat and the sampling tube has a section made in the form of a spool of the shut-off valve interacting with the seat of the support ring at the lower working position of the sampling lementa.