SU1427211A2 - Sampler - Google Patents

Abstract

The invention relates to a device for sampling from tanks and can be used in the refining and petrochemical industries. The purpose of the invention is to reduce time 1 and fluid loss during sampling. The sampler includes a flexible sampling tube 1, attached to the cable 2 on the blocks 3,4,5,6, one end of which is connected to the fitting 9 of valve 10, and

Description

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the other end is fitted with a pneumatic locking device 7, to which an additional pneumatic line 8 is connected, a drain tube 12 is connected at one end to a tap 14 for draining samples, and the second to the second fitting 9 of valve 10. For the forced movement of valve 10 an additional cable 20 serves, one end of which connected to the load 19, and the second is embedded in the groove of the drum 21. When the liquid level in the tank with the pontoon changes, the valve 10 with the load .19 moves by the same amount as the pontoon. The sampling is carried out by simultaneously opening the valve 10 and the locking device 7 with air, immersing the valve 10 to the depth of the bay and draining the sample from the flexible tube through the drain tube 12 and the valve 14 into the dishes. The presence in the sampler of an additional pneumatic line 8 and a locking device 7 makes it possible to keep the flexible tube 1 and the drain tube 12 in a dry state. 2 Il.

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The invention relates to devices for sampling liquids from tanks and can be used in the refining and petrochemical industries. -.

The purpose of the invention is to reduce the sampling time and fluid loss during sampling.

Fig, 1 shows the sampler, a general view; in fig. 2 — node I in FIG. 1 (locking device) ..

The sampler contains a flexible test-tube 1, attached along the entire length to the cable 2 and placed together with him in the creeks of fixed blocks 3-6, fixed on the inner surface of the storage tank. The upper end of the sampling tube 1 is supplied. locking device 7. Additional pneumatic. the wire 8 serves to open the pneumatic valve of the locking device 7 and is placed together with the probe tube 1 in the arms of the fixed blocks 3-6. The lower end of the sampling tube 1 is passed through the seals of the hatch (not shown) and connected to the fitting 9 of the valve 10. The pneumatic line 8 together with the sampling tube 1 is also passed through the hatch sealing and connected (by means of a tee) to the pneumatic line 11 ,. through which air (inert gas) is fed into the inner cavity of the sylphon located inside the valve 10, the drain pipe 12 is connected at one end to the nipple 13 and the other end to the valve 14 to drain the samples. Inside valve 10, a rod 15 is placed, on which a plug 16 is fixed, a piston 17 and a bellows 18 with a spring (not shown), 5 located coaxially with the rod 15. A second cable 2 is attached to the valve 10 at one end (outside the tank) a load 19 is fixed. An additional cable 20 is connected to the load 19 at one end 0, and the second end of it, thrown over the block, is embedded in the groove of the drum 21. The valve 22 is designed to supply air

(inert gas) into the inner cavities of the bellows 18 and pneumatic

shut-off valve 7.

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The shut-off device 7 consists of a tip 23 inserted into the free end of the sampling tube 1. At the tip 23 an additional container 24 of the pneumatic valve is fixed. A membrane 25 and a spring 26 are placed inside the container 24. A stem 27 is rigidly attached to the lower part of the membrane (in the center); a stopper 28 is fixed to the output end of the membrane. At the lower part of the container 24 there are a number of holes 29 located with

0 the ability to communicate the sampling tube 1 with the atmosphere. An additional pneumatic line 8 (in order to avoid it) is placed in a flexible metal sheath 30. Air supply (air

5 gas) in the pneumatic valve of the locking device 7 is produced through the fitting 31.

314

The sampler works as follows.

In the initial position, the valve 10, regardless of the degree of filling of the tank, is in the upper extreme position above the surface of the liquid, resting its body against the hatch of the hatch. The free end of the sampling tube 1 is blocked by a locking device 7, and both tubes, i.e. sampling 1 and drain 12, are in a dry state. The position of the valve S is achieved by the load 19 attached to the trunk 2 and an additional 20 cables. When the level in the reservoir changes, the valve 10 and the load 19 also change their position by the same amount that it moves. pontoon (floating), carried along one side or the other with a flexible sampling tube, 1.

The average sample is taken as follows.

First, the valve 22 opens and the air through the pneumatic line 11 with pressure, for example, 0.3 MPa, enters the internal cavity of the bellows 18 and simultaneously through a tee (not shown) into the internal band of the pneumatic valve of the locking device 7. In this case the stopper 16 opens the inlet of the valve 10, the piston 17 moves so as to block the opening of the fitting 13, the opening of the fitting 9 remains open, the stopper 28 moves so that its lower edge is above the opening 29, Therefore, with the opening of the fitting 9 open the upper end plug 28, the positions SRI sample probe tube 1 is prepared for unhindered filling it with liquid. Then, by rotating the drum 21 counterclockwise, the weight 19 is raised and the valve 10, carried along the sampling tube 1, lowers to the bottom of the tank.

Thus, the liquid column is carved out.

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When the valve 10 reaches the bottom of the tank, the pressure in the pneumatic line decreases, for example, to O, 1 MPa, while the plug 16 closes the inlet of the valve 10, the piston 17 moves to its initial position, the opening of the choke 13 opens, and the plug 28 is still in the upper extreme position ( Fig. 2 is shown by dashed l-ini). Then the drum 21 begins to rotate clockwise, with the load 19 going down, dragging the sampling tube 1, the valve 10 and the drain tube 12 until the valve 10 takes up the initial position at which the liquid from the sampling tube 1 completely drains into the drain tube 12, and from there through the tap 14 into the dishes.

At the end of the drain of the sampled air pressure (inert gas)

from the pneumatic lines 11 and 8, it is etched down to 0, with the tip opening. 23 is closed by stopper 28 and both tubes (sampling and drain) are again in a dry condition.

Using the proposed sampler reduces fluid losses during sampling and time-consuming.

Claims (1)

Invention Formula Sampler on auth. No. 1352294, characterized in that,; in order to reduce sampling time and fluid loss, the sampler is equipped with an additional pneumatic conduit and a spare device containing a tip, a pneumatic valve with a spring-loaded diaphragm and a stem, and the pneumatic valve is equipped with an additional capacity ,; filled with holes communicating the cavity of the sampling tube with the atmosphere and fitted with a spring-loaded membrane placed in it rigidly connected to the rod equipped with a stopper installed COOG but with ICOM. tpu & .Z