JP2008185042A - Repair method of nozzle stub support of pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a repair method of a nozzle stub support of a pipe to enable repair suitably without stopping gas supply even when gas leakage occurs in the nozzle stub support of a flammable gas pipe. <P>SOLUTION: A box shaped object 20 made of a steel plate is disposed in both sides of the nozzle stub 11 to cover the nozzle stub support in which gas leakage occurs so as to seal gas leakage. The nozzle stub 11 and the pipe 10 and the boxlike object 20 are connected by welding (incorporated), evacuating the leakage gas sealed in the boxlike object 20 with a nitrogen ejector 30. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for repairing a pipe pedestal support.

  Traditionally, an overhead piping base support section installed in a steelworks or the like has a pipe 10 mounted on a base 11 fixed with bolts or the like on a base 12, as shown in FIGS. 6 (a) and 6 (b). In addition, the length of the pipe 10 due to thermal expansion and contraction is absorbed by sliding (sliding) between the pipe 10 and the nozzle base 11.

  However, after many years of use, the pipes that are in contact with the nozzle due to wear due to sliding during expansion and contraction of the pipe and dust corrosion in the gap between the pipe and the nozzle and crevice corrosion due to rainwater intrusion Thinning deterioration and perforation have occurred.

  If the pipe is a gas pipe, the above-mentioned perforation will cause the gas to leak from that location. Depending on the characteristics of the leaked gas (flammability, toxicity, etc.) It is necessary to perform appropriate repairs.

  At that time, in the case of pipes that supply gas over a wide range, such as gas pipes in steelworks, if the gas supply is stopped to repair gas leakage, the operation of many facilities must be suspended. The impact (loss of opportunity) will be very large.

  Therefore, it is desired to appropriately repair the nozzle support portion where gas is leaked due to perforation in the pipe without stopping the supply of gas.

  The present invention has been made in view of the circumstances as described above, and in particular, for the combustible gas piping, the nozzle support portion where the gas leakage has occurred is appropriately repaired without stopping the gas supply. It is an object of the present invention to provide a repair method for a nozzle pedestal support portion of piping.

  In order to solve the above-mentioned problems, the present inventors have intensively studied and, as a result, have reached the following concept.

  That is, first, in order to seal the leaked gas leaking from the perforated part of the pipe of the nozzle support part via the gap between the pipe and the nozzle, Cover the surrounding area with a box-shaped body.

  At the same time, the pipe is placed on the nozzle fixed on the base as before, and the structure that absorbs fluctuations in the pipe length due to thermal expansion and contraction by sliding (sliding) between the pipe and the nozzle is changed. The length of the pipe due to thermal expansion and contraction is assured by separating the pedestal and the pedestal and allowing the pedestal to move on the pedestal and connecting (integrating) the pedestal, the pipe and the box-like body by welding. A structure that absorbs fluctuations by sliding (sliding) between the nozzle and the base. As a result, there is no sliding between the pipe and the nozzle, and it is possible to prevent further deterioration of the pipe thickness and perforation.

  However, if the piping is made of flammable gas, attempting to connect (integrate) the nozzle pedestal, piping, and box-like body as they are without any risk of ignition or explosion of the leaked flammable gas. Sex comes out.

  Therefore, if the nozzle, pipe, and box are connected (integrated) by welding while removing the flammable gas that has leaked, it is possible to avoid ignition and explosion of the flammable gas. it can.

  Based on the above concept, the present invention has the following features.

  [1] A repair method in the case where gas leakage occurs from the flammable gas pipe in the pedestal support section in which the flammable gas pipe is mounted on the nozzle fixed on the pedestal, Covering the pedestal support with a box-shaped body to seal the leaked gas, sucking and removing the leaked gas sealed in the box-shaped body, and connecting the nozzle, piping, and the box-shaped body by welding; A method of repairing a nozzle pedestal support part for piping, characterized in that the nozzle is separated so that the nozzle can slide on the frame.

  [2] The method of repairing a pipe pedestal support part according to [1], wherein the leaked gas sealed in the box-like body is sucked and removed by an ejector using nitrogen gas.

  In the present invention, even if gas leakage occurs in the nozzle support part of the combustible gas pipe, the nozzle support part can be appropriately repaired without stopping the gas supply. As a result, it is possible to avoid the suspension of the equipment due to the stop of the gas supply, and it is possible to suppress the expansion of the deterioration due to the wear and corrosion of the piping of the nozzle support section.

  One embodiment of the present invention is described below.

  In this embodiment, as shown in FIG. 6, a pipe (here, a combustible gas pipe) 10 is placed and supported on a nozzle 11 fixed with bolts or the like on a gantry 12, and by thermal expansion and contraction. Repair method in the case where gas leakage occurs from the flammable gas pipe 10 in the nozzle support section configured to absorb the fluctuation of the length of the pipe 10 by sliding (sliding) between the pipe 10 and the nozzle 11 The nozzle support 11 is covered with a box-shaped body to seal the leaked gas, and the leaked gas sealed in the box-shaped body is removed by suction with a nitrogen ejector. Are connected by welding, and the gantry 12 and the nozzle 11 are separated so that the nozzle 11 can slide on the gantry 12.

  Hereinafter, the work procedure of the repair method according to this embodiment will be described with reference to the drawings.

  (S1) First, as shown in FIG. 1, an ejector (nitrogen ejector) 30 using nitrogen gas is installed in the vicinity of the nozzle 11 where gas leakage occurs, and the leakage gas is removed by suction. At that time, the gap between the pipe and the nozzle pedestal other than the vicinity of the gas leakage portion is clogged with the resin 41 to enhance the ejector effect. In FIG. 1, 31 is a hose of the nitrogen ejector 30, 32 is a pressure gauge, and 33 is a flow rate adjusting valve. Incidentally, the nitrogen ejector 30 is used in order not to form an explosive mixture of the leaked gas that has been sucked.

  (S2) Next, a fixing bolt (not shown) between the nozzle 12 and the gantry 11 is removed. As a result, the nozzle 11 becomes slidable on the gantry 12.

  (S3) Next, as shown in a side view in FIG. 2 (a), a cross-sectional view in FIG. 2 (b), and a perspective view in FIG. A box-shaped body 20 of steel plate is arranged on both sides of the nozzle 11 and leaking gas is sealed. At that time, the nozzle 20 for attaching / detaching the nitrogen ejector 30 and the hose 31 and the drain pipe 22 are installed in the box-like body 20.

  (S4) The nozzle 11, the pipe 10 and the box 20 are connected (integrated) by welding while the leakage gas sealed in the box 20 is removed by suction with the nitrogen ejector 30.

  (S5) Further, as shown in FIG. 4 (a), a side view, FIG. 4 (b), a cross-sectional view, and FIG. The ribs 26 are welded.

  As described above, in this embodiment, even when a gas leak has occurred in the nozzle support part of the flammable gas piping, the repair of the nozzle support part is appropriately performed without stopping the gas supply. It can be carried out. As a result, it is possible to avoid the suspension of the equipment due to the stop of the gas supply, and it is possible to suppress the expansion of the deterioration due to the wear and corrosion of the piping of the nozzle support section.

  In this embodiment, the box-shaped body 20 is arranged on both sides of the nozzle 11, but a box-shaped body surrounding the entire nozzle 11 may be used.

It is a figure for demonstrating the work procedure in one Embodiment of this invention. It is a figure for demonstrating the work procedure in one Embodiment of this invention. It is a figure for demonstrating the work procedure in one Embodiment of this invention. It is a figure for demonstrating the work procedure in one Embodiment of this invention. It is a figure for demonstrating the work procedure in one Embodiment of this invention. It is a figure for demonstrating the structure of the nozzle base support part of piping.

Explanation of symbols

10 Piping (flammable gas piping)
DESCRIPTION OF SYMBOLS 11 Tubular base 12 Mounting frame 20 Box-shaped body 21 Ejector and hose attachment / detachment nozzle 22 Drain pipe 25 Tap plate material 26 Reinforcement rib 30 Nitrogen ejector 31 Hose 32 Pressure gauge 33 Flow rate adjustment valve 41 Resin filling

Claims (2)

  In a nozzle support section in which a combustible gas pipe is mounted on a nozzle fixed on a gantry, a repair method in the case where gas leakage occurs from the combustible gas pipe, the nozzle base support section The casing is covered with a box to seal the leaked gas, and the nozzle, pipe and box are connected by welding while removing the leaked gas sealed in the box. A method of repairing a nozzle pedestal support part for piping, characterized in that the pedestal is slidable on the frame.   The method for repairing a pipe pedestal support part according to claim 1, wherein the leaked gas sealed in the box-like body is removed by suction with an ejector using nitrogen gas.

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