SU1543288A1 - Device for taking samples of liquid from tanks - Google Patents

Abstract

This invention relates to a fluid sampling technique and can be used in the oil refining industry, as well as in gas and oil storage tanks. The aim of the invention is to reduce the loss of the test liquid. The device contains sampling tubes, the intake ends of which are fixed on the float placed in the tank, and the drain, equipped with shut-off members, each made in the form of a piston with a drain channel, are located outside the tank. The intake ends of the tubes are equipped with locking-drain fittings, each of which is made in the form of a conical socket with a spring-loaded stopper installed in it with a through channel communicated by means of a flexible tube with the atmosphere of the reservoir. The plug is connected by a cable passed through the sampling tube to the piston of the valve member. 3 il.

Description

The invention relates to a fluid sampling technique and can be used in the oil refining industry also in gas and oil storage tanks.

The purpose of the invention is to reduce the loss of the test liquid.

Figure 1 shows the device, a general view; figure 2 - sampling tube with a shut-off device, a longitudinal section; on fig.Z - section aa in figure 2.

The device consists of three sampling tubes 1-3, connected to nozzles 4-6, with tubes 1 and 2 connected to nozzles 4 and 5 via flexible junctions 7 and 8

(figure 1) and attached by clamps to the carrier arm (rod)

9 pivotally attached to the bracket

10. At the other end of the bearing arm 9, a float 11 is hinged. The stop valves 12-14 are fixed at the upper ends of the tubes 1-3. Flexible tubes

.15-17 one ends attached to the openings of the plugs, and their other ends are open and located above the level of the liquid and attached together with tubes 1 and 2 to the bearing arm 9. To the nozzles 4-6 are connected drain fittings 18-20 with valves 21-23 for sample discharge.

Shutoff device (figure 2) of each tube consists of a socket 24,

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fixed at the end of the sampling tube 1. Coaxially with the socket 24, there is a tube 25, in the body of which a channel 26 is made, which provides a message through the flexible tube 15 to the internal cavity of tube 1 with the atmosphere of the tank. The stopper 25 is provided with a normally compressed spring 27, one end of which is connected to the stopper 25, the other to a bracket 28 rigidly attached to the socket 24. Inside the nozzle 4 there is a piston 29, in its body a channel 30. The groove 31 is formed on the outer surface of the piston 29 freely connected to a protrusion 32 located on the inner surface of the nozzle 4 (FIG. 3). In order to provide a reciprocating movement of the piston 29 in the cover 33 and the stem 34, threads are made, with one end of the rod 34 freely embedded in the body piston 29, and on the output of his con e fixed wheel 35. Piston 29 and tube 25 are interconnected by a cable 36. The drain valve 37 is designed to control the presence of fluid in the cavity of the sampling tube. The reciprocating motion of the piston and the plug can be carried out using a pneumatic or electric drive, therefore, the sampling procedure can in this case be carried out automatically or according to a given program without the direct participation of the service personnel.

The sampling of point samples is carried out as follows (for example, sampling from tube 1 is given).

In the initial position, the tube 1 is in the closed state, i.e. rod 34 is reversed to the point where the channel 30 is not aligned with the drain fitting 18, the cable 36 is tensioned, the spring 27 is stretched and the socket 24 is blocked by a plug 25. Before taking the sample, first open the drain valve 37 to check for the presence of fluid in the tube 1, which may accumulate as a result of partial condensation of vapors or leakage at the joints of the socket 24 with the stopper 25. After accumulating in the tube 1, the liquid through the drain valve 37 is drained into the drainage channel and closed again. Then by turning

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five

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The wheels of the handwheel 35 move the piston 29 clockwise until the channel 30 is aligned with the drain fitting 18, and the valve of the valve 21 must be closed. In this case, the tension of the cable 36 will loosen, the tube 25 under the action of the elastic force of the spring 27 will come out of the cavity of the socket 24 and the liquid through the tube 1 through the channel 30 and the fitting 18 will merge into the dishes. By taking the required amount of sample, the piston 29 is moved clockwise to the starting position at which the channel 30 moves relative to the axis of the drain fitting 18, the cable 36 is tensioned, the plug 25 will block the socket 24, the spring 27 will open and the tube 1 will again turn in the closed state.

The proposed device allows to prevent the ingress of condensate that accumulates into the cavity of the sampler tubes, as well as to exclude uncontrolled drainage of the test liquid in the selection process, which leads to a reduction in its losses.

Claims (1)

Invention Formula A device for sampling liquids from tanks, containing sampling tubes, the intake ends of which are fixed to the float placed in the tank, and the drain ones are provided with shut-off members, and a supporting lever, characterized in that, in order to reduce the losses of the test liquid, the sampling tubes are fitted with shut-off -slive devices mounted on their intake ends, each of which is made in the form of a conical socket with a spring-loaded plug installed in it with a through channel communicated by bending The tube with the atmosphere of the tank, and each of the locking bodies are made in the form of a sampling nozzle and equipped with a piston rod with a channel installed in the sampling tube with the possibility of new movement and alignment of the piston and sampling nozzle channels, while the piston and stopper are connected between by means of a cable passed through the sampling tube. 20 15 FIG. 2 Fig.Z