JPS6035592B2 - Method and device for sealing leaks from gland packing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for sealing leaks from a gland packing.

In plants of various industries, high-temperature, high-pressure piping lines, for example, 100 to 40,000 steam piping lines, are lined vertically and horizontally, and these piping lines are equipped with many valves sealed with gland packing. It is being

By the way, in the past, IJ
- When a problem occurred, for reasons of safety and economy, if the line was a branch line of the plant, that section of the line would be shut down and repaired.

However, in the case of leakage from gland packing such as valves installed in major piping lines, the entire plant had to be shut down for repairs. In any case, the cost of repairing and restarting the system often amounts to a huge amount of money, so in many cases, there was no choice but to leave the leakage until regular inspections. Therefore, in recent years, methods have been proposed and implemented to stop leaks from piping lines while the plant remains in operation.

This method uses an injection gun to inject a semi-plastic synthetic material, such as a sealing material called Creseal CS (trade name), into the leaking area at a pressure higher than the internal pressure of the piping line. This is a method of sealing and curing, and various methods and devices for preventing leakage from the connecting flange of the piping line have already been proposed. However, if there is a leak of high-temperature, high-pressure fluid, such as steam, from the gland packing of a valve, for example, a hole A reaching the packing 3 from the outer periphery of the valve body 1 is conventionally used as shown in FIG. Then, an injection gun was attached to this hole A and sealant was injected to prevent leakage.

However, for valves installed in high-temperature, high-pressure piping lines, raising the hole often poses a risk of damaging the valve body and ignition when raising the hole, which poses safety issues for plant operation. There has not yet been an appropriate method or device for preventing leakage from packing.
The present invention can apply a sealing material to the leakage point without stopping plant operations and without drilling a hole in the valve body even when leakage occurs from the gland packing of a piping line, for example, the gland packing of a valve. The object of the present invention is to provide a method and apparatus for preventing leakage by injection.

According to the method of the present invention, a gland bolt is loosened, a steel pipe is wound thinly around the outer periphery of a gland bushing between a member provided with a packing such as a valve body, and a gland holder, and then a steel pipe is wound around the outer periphery of the wound steel pipe. A pair of fastening tools are engaged, the fastening tools are tightened around the outer periphery of the wrapped steel pipe with a fastening bolt, and the copper pipe is fixed by tightening the gland bolt, and then the injection port is attached to the proximal end of the copper pipe. Attach a sealing material injection gun to the tank and inject the sealing material into the packing through the copper pipe through the gap between the inside of the member where the packing is installed and the outside of the gland bushing, at a pressure higher than the internal pressure. Once the material has been injected, the injection port is closed with a blind bolt, and after a certain period of time, the gland bolt is loosened, the tightening bolt is removed, the tightening tool and the copper pipe are removed, and the gland bolt is then tightened. .

Further, according to the apparatus of the present invention, a steel pipe having a sealing material injection port attached to the base end and wound spirally around the outer circumference of the gland bush of the gland packing, and a steel pipe wound around the outer circumference of the gland bush. A pair of tightening tools that fit together, a tightening bolt that tightens the tightening tool to the outer periphery of a steel pipe wrapped around the outer periphery of a gland bush, a gland holder that can press the copper pipe with the gland bolt, and a sealing material injection that is attached to the injection port of the steel pipe. It consists of a gun and a blind bolt that closes the injection port, and each of the pair of tightening tools is provided with a tightening piece that faces the wound steel pipe in the diametrical direction, and the steel pipe is tightened in a direction perpendicular to the tightening tool to tighten the bolt. engaged.

Therefore, if a leak occurs, loosen the gland bolt and wrap the steel pipe in a spiral around the gland bushing between the gland holder and the member where the packing is installed, such as the valve body. A tightening tool is engaged with the outer periphery of the steel pipe, and a tightening bolt and a gland bolt are tightened to fix the steel pipe. When the sealant is injected, the sealant passes through the steel pipe and flows out from the inner end in the radial direction, but the top and bottom of the steel pipe are sandwiched between a member with a packing such as a valve body and a gland holder. , and is tightened with a gland bolt, and the steel pipe is wound in a spiral, so the leaked sealant has no place to escape, and the gap between the inside of the valve body etc. and the outside of the gland bushing has no place to escape. and is injected into the packing. Therefore, by simply wrapping the steel pipe around the gland bushing and tightening it, the sealing material can be injected into the gland bushing such as a valve body through the gap in the gland bushing.

Therefore, there is no need to stop plant operations, and no processing is required. Embodiments of the present invention will be described below with reference to the drawings. Fig. 1 shows the entire structure of a valve sealed with a gland packing in which the present invention is implemented, 1 is a valve body, 2 is a valve shaft passing through the valve body, and 3 is a space between valve body 1 and valve shaft 2. The loaded packing, 4 is a gland bush that presses against the packing 3, 5 is a gland holder, and 6 is a gland bolt, and by tightening the gland bolt 6, the packing 3 is crimped to the valve body 1 and the valve stem 2. Valve stem 2
seals the part that penetrates the valve body 1.

Others 7 are a bush into which a threaded portion cut into the upper part of the valve stem 2 is screwed; 8 is a support for supporting the bush 7 on the valve element 1; 9 is a handle fixed to the tip of the valve stem 2; By turning , the valve shaft 2 moves up and down, opening and closing the valve. In addition, in the figure, the gland bush 4 and gland presser 5 are
Although they are separate members, they may be combined into a ground holder. If a leak occurs in such a valve installed in a piping line, the leak is stopped according to the embodiment of the present invention described below.

In FIGS. 2 and 3, 1 is a steel pipe whose ends 10a are cut on both sides and is wound around the gland bushing 4 between the valve body 1 and the gland retainer 5, and 11 is attached to the base end 10b of the steel pipe 10. A pair of tightening tools 13A, 128, which engage the outer periphery of the wrapped steel pipe 10 and fix the steel pipe 10, are provided.
13B is a pair of tightening bolts that tighten the tightening tools 12A, 12B around the outer periphery of the steel pipe 10.

If a leak occurs from the gland packing of the valve, loosen the gland bolt 6 and wrap the steel pipe 10 around the gland bushing 4 between the valve body 1 and the gland presser 5.

Next, as shown in FIG. 2, a pair of tightening tools 12A, 12B are tightened with tightening bolts 13A, 13B in the diametrical direction of the outer periphery of the copper tube 10. Each of the tightening tools 12A and 12B has a tightening piece 12.
Since C and 12D are provided, the steel pipe can be tightened in the diametrical direction. At this time, the steel pipe 10 is restricted in the direction perpendicular to the tightening direction by the tightening bolts 13A, 138, and as shown in FIG. As a result, the steel pipe 10 is tightened and fixed. Then, the sealing material injection row 1 is attached to the base end 10b of the steel pipe 10. Next, a sealing material injection gun (not shown) is attached to the injection row 1, and the sealing material is injected into the packing 3 at a pressure higher than the internal pressure. After the sealing material is injected into the packing 3 in this way and the injected sealing material is cured by heat, the injection gun is removed, and after the removal, a blind bolt (not shown) is attached to close the injection port 11. The injection gun and the blind bolt may be integrated by screwing, for example. By doing this, steel pipe 1
0 is sandwiched between the valve body 1 and the gland holder 5 and tightened with a gland bolt 6, and the outer periphery of the steel pipe is vertically attached with a tightening tool 12 and a tightening bolt 13. The sealing material injected through the inside flows out from the tip 10a, and the flowing out sealing material has no escape and is injected into the packing 3 through the gap between the inside of the valve body 1 and the outside of the gland bushing 4. If this gap is very large, the gland bush 4 may be extended outside the valve body 1 to provide a gap for the passage of the sealing material. In this way, the sealant spreads over the space created by the abrasion of the packing, making it possible to stop leakage from the ground. After a certain period of time has passed, you can open and close the valve by turning the handle 9 in the same way as with a new packing. Loosen the gland bolt 6 and remove the tightening bolts 13A, 13B and tighten the tightening tools 12A, 1.
2B and the steel pipe 10 are removed, and the gland bolt 6 is tightened. This is for injecting the sealing material into the gland packing, so once the above-mentioned injection work is completed and the leak has stopped,
You can remove it afterwards, but since the copper pipe itself also serves as a packing, it is better and safer to leave the steel pipe attached.

As explained above, according to the present invention, when a leak occurs from the gland packing of a valve, etc., the leak can be stopped without stopping the plant operation, and by raising the hole leading from the outside of the gland to the packing. The sealing material can be injected into the packing simply by winding the steel pipe around the gland bushing in a spiral shape and fixing the steel pipe with a tightening tool and tightening bolt.
Therefore, it is possible to avoid a large amount of expense for repairing and restarting the plant, and to carry out economical and safe repair. Although the above description has been made regarding leakage from the gland packing of a valve, it goes without saying that the present invention can be applied to prevent leakage not only in valves but also in other devices that use gland packing as a shaft sealing device. be.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view of the entire valve equipped with a gland packing according to the present invention, FIGS. 2 and 3 show the same essential parts, and FIG. 2 is a cross-sectional view taken along the line 0 in FIG. 3 is a cross-sectional view taken along the line m in FIG. 2. 1... Valve body, 2... Valve stem, 3... Packing, 4...
Gland bush, 5...Gland presser, 6...Gland bolt, 7...Bush, 8...Futshu support, 9
．． ．． ．． Handle, 10... Steel pipe, 11... Inlet,
12... Tightening tool, 13... Tightening bolt. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] 1. A method for sealing leaks from a gland bushing of a valve, etc., in which a gland bolt is loosened and a copper pipe is spirally wound around the outer periphery of the gland bushing between a member provided with a gland bushing such as a valve body and a gland holder. Then, a pair of tightening tools is engaged with the outer periphery of the wrapped copper tube, and the tightening tools are tightened around the outer periphery of the wrapped copper tube with a tightening bolt, and the gland bolt is tightened to tighten the copper tube. Then, attach a sealing material injection gun to the injection port attached to the proximal end of the copper tube and apply the sealing material at a pressure higher than the internal pressure to the inside of the member where the seal is installed and the outside of the gland bushing. Inject the sealant into the gasket through the gap between the sealant and the sealant, and once the sealant has been injected, close the injection port with a blank bolt.
A method for sealing leaks from a gland packing characterized by loosening a gland bolt and removing a tightening bolt after a certain period of time has elapsed, removing a tightening tool and a copper pipe, and then tightening the gland bolt. 2. A copper tube with a sealing material injection port attached to the base end and wound spirally around the outer periphery of the gland bushing of the gland packing, and a pair of fasteners that engage with the outer periphery of the copper tube wound around the outer periphery of the gland bushing. A tightening bolt that tightens the tightening tool onto the outer periphery of the copper pipe wrapped around the outer periphery of the gland bushing, a gland holder that can press the copper pipe with the gland bolt, and a sealant injection gun that is attached to the injection port of the copper pipe. , and a blank bolt for blocking the injection port, each of the pair of tightening tools includes a tightening piece provided diametrically opposite to the wound copper tube, and the copper tube engages with the tightening bolt in a direction perpendicular to the tightening tool. A sealing device for leaks from the gland packing.