RU31653U1 - PIPELINE SAMPLING SYSTEM - Google Patents

Description

PIPELINE SAMPLING SYSTEM.

The utility model relates to fluid sampling devices and may find application in the oil and other industries where fluid sampling is required from pipelines operating under pressure.

A device for sampling liquid from a pipeline having a sampling element installed in the pipeline sampling hole, continuous or discrete, towards the flow. The device has an outlet assembly located on top of a horizontal or inclined section of the pipeline (RU, C1 2141105 publ. 1999.11.10).

A device for sampling from a pipeline is known, comprising a sampling element 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. (RU, C1 2087891, publ. 1997,08.20.)

The main disadvantage of such devices is the complexity of manufacture and operation.

There are also known systems for sampling fluid from a pipeline, based on taking individual doses of fluid flowing through the pipeline with a constant movement of a portion of the pumped fluid through the sampling device along the bypass line of the main pipeline at certain intervals and collecting them in a special container. From individual doses, a total average sample of the liquid is compiled.

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boron device, in the case of which a sleeve, a spring, a spool, an electromagnet are located, the anchor of which is connected to the spool. A metering chamber is located on the side surface of the housing, in the housing of which there is a differential piston. The volume of the sample taken in one cycle is regulated by setting the stroke pitch of the piston. The nadporshny part of the body of the dosing chamber is connected through the nozzle to the bypass line of the pipeline to create retaining pressure on the piston, and a hole is made in the subpiston part of the case to connect the chamber with the bypass line of the pipeline and the sampling tank. In the initial position, the armature with the spool under the spring force is in the upper position. When a control action is applied to the electromagnet, the armature retracts, overcoming the spring resistance, and the spool goes to the lower position, while the product enters the working cavity of the metering chamber, overcoming the pressure in the chamber cavity and moving the differential piston. Liquid filling the metering chamber is carried out by displacing the slide valve relative to the windows in the surface on which it slides. When removing the control action on the electromagnet, the spring returns the anchor with the spool to its original position. The piston moves by the pressure of the liquid in the supra-piston cavity and the product is discharged into a sampling container (Passport for a sampler of type АПЭ-М АИУ2.840.008, serial number 054 БУП №068 of October 5, 2001).

The disadvantage of this device is the presence of complex structural units (spool system redistribution of fluid flows) that do not ensure reliable operation of the device in operation and increase the dimensions of the device.

The utility model is based on the task of simplifying the system for sampling and increasing its reliability, provided that the device performs the liquid sampling function in a high-quality manner.

The problem is solved in that in a system for sampling from a pipeline containing a metering chamber with an adjustable sample volume, a control unit for the redistribution of fluid flows and means for creating an inlet line section adjacent to the metering chamber combined with a drain line section, while the dosing chamber is made in the form housing with a piston installed in it with the possibility of a specified axial movement and has a hole in the nadporshnevoy part to provide retaining pressure on the piston, and in part of the hole for the connection of the aforementioned chamber through the inlet pipe with the pipe line and through the drain pipe with a container for collecting samples. What is new is that solenoid valves are installed on the inlet and drain lines, electrically connected to the control unit to control the process of taking a dose of liquid and draining this dose into a tank.

It is advisable to choose direct acting solenoid valves.

Preferably, the means for creating near the opening of the piston portion of the metering chamber a portion of the inlet line combined with a section of the drain line is performed in the form of a T-shaped tubular insert, for example, a tee.

It is advisable to create a near-hole under-piston part of the intake manifold section combined with the drain manifold section

perform connected with the housing of the metering chamber or at the same time with the housing of the metering chamber.

Figure 1 presents a diagram of the proposed sampling system, where the solid lines depict the hydraulic lines, and the dotted electrical connections of the control unit with actuators (valve actuators). The main pipeline is depicted as a pipe segment. The fluid pressure at point A is always greater than the pressure at point B by the value of LR, provided that the fluid is transported in the direction of the arrows.

The device includes a metering chamber in the form of a sealed cylindrical housing 1. Inside the housing 1 there is a piston 2 with a cylindrical guide sleeve 3 for axial movement along the limiter-regulator 4 with subsequent fixing with the lock nut 5 of the set volume of a single dose of liquid sample (V sample).

In the nadporshne part of the housing 1, a through channel with an inlet 6 is made for communication through a connecting pipe (not shown) of the nadporshne cavity 7 with a bypass line 8 from the main pipeline 9.

In the sub-piston cavity 10, which determines the dose of a single sample (V sample), there is an inlet-drain hole 11 for communication through a connecting pipe (not shown) with the first input of the tee 12, the second input of which is connected to the inlet pipe 13 with a valve 14 located on it connection with the pipeline 9, and the third inlet of the passage tee is connected to the exhaust manifold 15, with a valve 16 placed on it to discharge a single dose of liquid sample into the tank 17, and the valve actuators are connected to the control unit 18.

The control unit 18 serves to generate and supply the necessary control signals to the valve actuators and allows flexible control of the sampling process.

The device is connected to an additional flow pipe (section AB), parallel to the main pipe 9, to create a pressure difference by the value of AR, due to the length of the pipelines in section AB.

In the initial state, the valve 14 is in the closed state, blocking the intake manifold 13, the valve 16 is open. Under the influence of pressure (Px-LR), the piston 2 moves down to the stop. Then, the valve 16 is put into a closed state.

The liquid sampling system consisting of: pipelines, a sampling device, a control unit, and a sampling tank is ready for operation.

To fill the metering chamber, the control unit 18 generates a signal to open the valve 14. When the valve 14 is open, the liquid from the pipeline 9 through the inlet pipe 13, the tee 12 and the inlet 11 enters the sub-piston cavity 10, moving the piston 2 up to the stop with the limiter 4 — the sub-piston cavity 10 (sample V) is filled with liquid, since the pressure on the opposite surface of the piston less by the amount of LR.

After a specified time, which is determined experimentally for minimum working pressures, a signal from block 18 gives a control signal to close the intake valve 14 and, after a time delay, a signal to open the valve 16, while under the influence of pressure (Px - AP) of the liquid in the bypass line 8, the piston moves down due to the fact that the force acting on the piston 2 from above is greater than the force determined by atmospheric

pressure, while the liquid is displaced by the piston 2 through the drain hole 11, tee 12, drain line 15, valve 16 into the tank 17.

Part of the intake manifold from the valve 14 to the passage tee 12 is made with a counter-incline to prevent the discharge of fluid from the said part into the tank 17.

After a specified time, determined for the minimum working pressure in the pipeline 9, a signal is sent from the control unit 18 to close the valve 16 to close the drain line 15. The device is brought to its original position.

The above procedures are repeated a specified number of times.

In an example of a specific implementation of a sampling system undergoing pilot testing, solenoid valves PVXG 262С013 24В from ASKO / JOUCOMATIC were used. A self-made KDS controller is used as a control unit, which converts information commands from a computer into analog electrical signals for actuators of solenoid valves.

At working pressures (0.1-6.4) MPa and a given volume of a single sample (4-10) cm, the sampling time is (1-4) sec.

The advantages of the proposed sampling device are that it is compact, has high reliability, has a relatively simple sampling scheme, which does not require large expenditures of time and labor for assembling the system and its operation.

Claims (4)

1. A system for sampling from a pipeline containing a metering chamber configured to control the volume of the sample, a control unit for the redistribution of fluid flows, and means for creating an inlet line section adjacent to the dosing chamber combined with a drain line section, the dosing chamber being made in the form of a housing installed in it with the possibility of a predetermined axial movement by the piston and has an opening in the nadporshne part to provide retaining pressure on the piston, and in the torsion and an aperture for coupling said chamber through an inlet line with a pipeline line and through a drain line with a sampling tank, characterized in that solenoid valves electrically connected to said control unit are installed on the inlet and drain lines. 2. The sampling system from the pipeline according to claim 1, characterized in that direct acting solenoid valves are selected as the said valves. 3. The sampling system from the pipeline according to claims 1 and 2, characterized in that the means for creating near the opening of the piston portion of the metering chamber a portion of the intake manifold combined with a drain manifold portion is made in the form of a T-shaped tubular insert. 4. The sampling system from the pipeline according to claim 3, characterized in that the said means is associated with a metering chamber.