CS258286B1 - Automatic degasser for liquid conveying - Google Patents

Abstract

The automatic degasser for pipeline transport is designed as a transfer pipe inserted into a vertical pipe bend, the collection nozzle of which is installed at the top of the vertical pipe bend and the outlet profile of the transfer pipe is located in the concave part of the lower pipe bend.

Description

BACKGROUND OF THE INVENTION The present invention relates to an automatic degassing apparatus for conveying liquids.

When designing a pipeline for conveying liquids, it is often necessary to use a vertical pipeline fracture so that the pipeline axis suddenly drops in the direction of fluid flow. The damping principle violates the principle that the liquid transport line should rise in the direction of flow in order to avoid the formation of a gas buildup which limits or even prevents the flow of liquid through the line. In such cases, the local apex is generally provided with a venting fitting, either by an automatic or manually operated degassing valve. However, this solution often leads to difficulties. Automatic float valves based on the float principle do not leak over time due to corrosion and incrustation. The liquid then escapes from the pipeline, which in some cases causes considerable drawbacks and difficulties.

At other times, no leakage of gases into the pipe environment can be allowed. Manually operated valves require regular operation and maintenance, ie labor requirements. Another drawback is the need to catch or eventually drain the liquid that leaks when the gas is discharged from the pipeline. This entails additional investment and operating costs, in particular for liquids and gases that are flammable or otherwise dangerous. Difficulties also arise where pipelines run freely above ground level.

There is a risk of freezing of the degassing fittings and the subsequent degassing pipes during the frost period. Then there is no choice but to apply demanding investment and operational measures in order not to disturb the function of the pipeline, especially during stoppages.

These drawbacks are overcome by the use of the automatic liquid degasser according to the invention, which is based on the insertion of the degassing tube inside the vertical fracture of the pipeline when the pipeline axis suddenly drops in the direction of liquid flow. This solution is based on the principle of the use of centrifugal forces which cause accelerated flow in the concave part of the pipe elbows. A transfer tube is inserted into the concave of the lower pipe bend, inserted inside the pipe quarry. Due to the increased velocity of the liquid in the concave part of the mine bend, there is a permanent vacuum in the transfer tube. Conversely, there is an overpressure in the inlet profile of the transfer tube. This leads to an intense flow of liquid through the conduit and thereby to a continuous removal of the gas particles advancing to the top of the local fracture of the conduit.

The use of an automatic pipe degasser continually avoids the formation of gas bags in the pipe and the associated negative phenomena without the use of expensive fittings. There is no need to remove leaked gases and liquids. The solution is absolutely safe even in the case of flammable or otherwise dangerous liquids and gases. It is also advantageous for applications where the pipeline is routed freely above ground level. Subsequently, there are no significant complications associated with degassing during the frost period. The use of the invention in all cases leads to savings in investment costs. Maintenance and operation costs are completely eliminated.

In the accompanying drawing, an example of an embodiment of an automatic line degasser for transporting liquids according to the invention is shown, in FIG. BB plane. Arrows indicate the direction of fluid flow in the pipe.

The automatic degasser forms a transfer tube 6, fixed inside the conduit 2 by means of the clamps 3k of the conduit 6. The inlet profile of the transfer tube 4 forms a collecting throat 6, which abuts against the top of the pipe 2. The orifice profile 6 is located in the concave part of the lower pipe bend 6 of the pipe.

2.

Automatic degasser functions:

The liquid flowing through the conduit 6 carries the separated gas particles, especially in the upper part of the flow profile. Thus, the mixture of liquid with a higher concentration of gaseous particles is directed towards the collecting port 8. The main liquid stream flows through line 6 from the top of the vertical fracture of line 6 to its bottom. In the concavities of the tubular arcs 4, the velocity of the liquid stream increases as a result of centrifugal forces. This creates a negative pressure in the orifice profile 6 of the transfer tube and accelerates the flow of the mixture of liquid and gas particles in the transfer tube. The mixture of liquid and gaseous particles discharged from the outlet profile 6 of the transfer tube 4 is dispersed due to the turbulence in the liquid. The gas particles pass in the conveyed liquid through the line 2 further to the point of further degassing or the outlet of the line 2.

Claims (1)

SUBJECT OF THE INVENTION An automatic pipe degasser for conveying liquids, characterized in that a transfer tube (1) is inserted into the vertical fracture of the conduit (2), the collecting port (4) of which is mounted at the top of the vertical fracture of the conduit (2) and the outlet tube (5) (1) is located in the concave part of the lower pipe bend (6) of the pipe (2).