SU1721383A1 - Method of connecting branches to operating gas line - Google Patents

Abstract

The invention relates to pipeline transport, in particular to methods for connecting consumers to low pressure pipelines or medium and high pressure pipelines while reducing the pressure in them to low for the connection time. The purpose of the invention is to improve the quality of welding and safety of work. The window in the gas pipeline is cut out by sequentially sealing a part of the cutout with refractory material to form a jumper holding the cut part and subsequent mechanical destruction of the jumper, and after the end of the plug is removed from the rolled flexible element, an additional removable outlet is installed to remove possible gas leaks. 1 hp f-ly, 5 Il.

Description

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The invention relates to pipeline transport, in particular to methods for connecting new consumers to low pressure pipelines or medium low pressure pipelines while reducing the pressure in them to low for the connection time.

The aim of the invention is to improve the quality of welding and the safety of work performed on a gas pipeline under pressure.

Figure 1 shows a pipeline with a flame arrester installed near it. the window is cut from the side, general view; figure 2 is the same, the window in the upper part of the pipeline; FIGS. 3 and 4 are a diagram of the operation of welding the lateral outflow, respectively, for FIGS. 1 and 2;

Fig. 5 shows the finished retraction after removal of the tape plug.

The method is carried out by installing fire suppressors 2, including neck 3 and socket 4, near pipeline 1. When the outlet is attached from above, neck 5 and socket 6 have a different shape. Attachable tap 7 carries a mounting sleeve 8 on which candle 9 slides. Cap 10 is made of a cord impregnated with a refractory solution and is provided with a cord 11, for which the braid by turn after coil is removed.

The connection of the branches to the existing gas pipeline by the proposed method is carried out as follows.

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In the wall of the existing pipeline 1 begin to cut a window (figure 1). which leads to ignition of the jet of gas escaping from the slot. In order to secure the gas cutters, a flame arrester 2 is installed in the outflow zone of the gas jet, which directs the entire heat flow upwards. As the slot expands, the burning rate increases, to reduce which part of the finished slot is sealed with a refractory mass that stops gas flow. P so on the wall of the pipeline cut out not until the end, left him hanging on a thin leg, Remove the arrester 2, knock the flame and mechanically destroy the jumper. The resulting hole, from which the gas flow expires, is sealed with a plug 10, stopping the flow of gas to the welding point. The cord 11 is led out into the opening of the sleeve 8, onto which the plug 9 is drawn, and then proceeds to weld the outlet to the wall of the pipe, behind which there is a gas flow. When the temperature rises, the inserted plug 10 may dry out and partially pass through, which may cause a fire in the weld zone. All possible leakage through the candle 9 is diverted to a safe place. After performing the welding work, the candle 9 is removed and the tape is pulled from the body of the plug, which carries with it the refractory mass. The hole is free. Then the tube is wrapped in the sleeve 8 and brewed.

When using the proposed method of connecting the branches to the existing gas pipeline, the conditions for safe cutting of the tube from the wall of the pipeline under pressure under conditions when the flame of the burning gas does not interfere with the gas cutter to perform its operation and is subject to regulation are provided, besides, the problem of connecting the drain the adapter is blocked up with the cutting tool and the drive, the possibility of chips getting inside the pipeline is eliminated, the working conditions of the gas transport system are improved rschika connectable to a branch guide tube wall with a window having the reduced tightness and reducing condition is provided bandwidth window cut most ratsionalnymi.sredstvami.

It should be emphasized that the set of equipment used in this case

for tie-in, it does not go beyond the limits of gas pipelines, which are usual for builders, and after finishing work there are no problems with where to store equipment subject to corrosive wear, the purity of which cannot be maintained when working in the zone of loose soil.

The proposed method was tested under operational conditions and takes into account the real requirements of the operators in

full.

Claims (2)

1. The method of connecting the branches to the existing gas pipeline by cutting a window in the gas pipeline, sealing it a plug of a rolled-up flexible element with a coating of refractory material and a discharge end, which is brought out through the cavity of the discharge and mounting nozzles, inserts into the gas pipeline by welding the branch pipe, removing the plug and sealing the assembly pipe, characterized in that, in order to improve the quality of welding and safety of work, the window is cut out with consistent by sealing a part of the cutout with a refractory material with the formation of a jumper holding the cut part and the subsequent mechanical destruction of the jumper, and after the end of the plug is removed to the mounting pipe installs an additional removable outlet to remove possible gas leaks. 2. A method according to claim 1, characterized in that the surface of the plug installed in the gas pipeline window is additionally coated with refractory material. Firearm ////// /// /// /// / s / /// /// /// /// /// /// /// /// / 77/77 1 1 Refractory 10 11 phag 1 Gas leaks Figm