JPH0313036Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an anticorrosion cover for a pipe flange joint.

[Conventional technology]

In the past, almost no measures were taken to prevent corrosion of flange joints of exposed piping. and,
If untreated piping like this is left unattended for a long time,
Rainwater, dust, etc. can enter between the flange surfaces and damage them. In addition, untreated packing materials, sealing materials, bolts, nuts, etc. deteriorate quickly.
Piping has been removed and parts replaced, but the cost is high and rust has formed, making it difficult to check the deterioration of the packing material.

Even if pipe flange joints are coated and repaired to prevent corrosion, treatment between the flange surfaces cannot be done.
It has the same drawbacks as the one without countermeasures.

Therefore, as a means to prevent corrosion of the flange joint of exposed piping, a method of wrapping an anticorrosive tape around the outer circumference of the piping flange or a method described in Japanese Utility Model Application Publication No. 56-87689,
A method described in Japanese Patent No. 57-119194 was considered.

As shown in FIG.
The outer periphery 18 of the joint portion 6 and 16 is covered with a contraction tube 30.

As shown in FIGS. 6 and 7, the device described in Japanese Utility Model Application Publication No. 57-119194 has molded rubber gaskets 32 on both sides of the piping flanges 16, 16, which form an annular shape when two pieces are put together. are brought into contact with each other, covered with a rubber sheet 33 from the outside, and both ends of the rubber sheet 33 are fixed to the pipe 15 with reinforcing tape 34.

[The problem that the idea aims to solve]

The means for wrapping the anti-corrosion tape around the outer circumference of the piping flange requires replacing the anti-corrosion tape at the time of leakage inspection, and is not weather resistant, allowing rainwater to enter and conversely trapping the anti-corrosion environment.

The one shown in FIG. 5 has a simple structure and is useful, but the shrink tube 30 is easily deteriorated and cannot be reused after being removed for repairs or the like. Further, the ones shown in FIGS. 6 and 7 cover the entire piping flanges 16, 16, and have excellent anticorrosion effects. However, if a leak occurs due to loose piping, etc., it takes time to remove it, and it takes a lot of effort to restore it. Impossible to tighten.

This invention was made in view of the above matters,
It has a long-lasting anti-corrosion effect, is easy to attach and remove from piping flanges, and can be used repeatedly.
A technical problem is to provide a corrosion protection device in which bolts 21 and nuts 22 for tightening piping flanges 16 and 16 can be installed separately from the piping flange corrosion protection device.

[Means to solve the problem]

The present invention is an anti-corrosion cover formed on the inner surface in a shape that matches the outer periphery 18 of the joint part of the piping flanges 16, 16, and the inner surface is approximately semicircular like the upper body cover 1 whose inner surface is formed in a substantially semicircular shape. A lower main body cover 2 formed in a circular shape is provided, and fastener mounting portions 3 are provided at both ends of the upper main body cover 1 and lower main body cover 2, respectively, and a fastener 5 is attached to the upper main body cover 1. An arcuate tongue piece 7 is provided at one end of the main body cover 1 and the other end of the lower main body cover 2, and the tongue piece 7 is formed to become thinner gradually toward the tip. An arcuate tapered part 8 into which the tongue piece 7 is inserted is formed on the inner surface of the end and the inner surface of one end of the lower body cover 2, and the upper body cover 1 is further provided with a through hole for detecting leakage. 9, and the lower body cover 2 is provided with through holes 9 for injecting an anticorrosive agent that maintains a fluid state and for draining, and each of the through holes 9 is formed so as to be able to be closed with a closing device. This anti-corrosion cover for piping flanges is designed to be able to fill and hold the anti-corrosion agent between the piping flanges 16, 16, and to facilitate leakage detection and drainage.

[Effect]

As shown in FIGS. 1 to 3, the present invention provides an upper body cover 1 that is attached to the outer circumference 18 of the joint of piping flanges 16, 16, which are fastened with bolts 21 and nuts 22, via a packing sheet 25 or the like. When the lower body cover 2 is abutted and the fastener 5 is tightened, the joint outer periphery 18 of the piping flanges 16, 16 and the inner surfaces of the piping flanges 16, 16 are isolated from the outside. At the joint portion of the upper body cover 1 and the lower body cover 2, an arc-shaped tongue piece 7 formed on one side and gradually becoming thinner toward the tip is inserted into an opposing arc-shaped tapered part 8. It is tightened and tightened like other parts.

A through hole 9 provided in the lower body cover 2
An anticorrosive agent that maintains a fluid state, such as petrolatum paste, is injected between the surfaces of the piping flanges 16, 16. When injecting this anticorrosive agent, if the through hole 9 of the upper body cover 1 is closed with a fingertip, the internal pressure will be reduced. The leakage can be detected by checking the airtightness of the piping flange anti-corrosion cover from the degree of rise.

After the anticorrosive agent is filled between the surfaces of the piping flanges 16, 16, the through-holes 9 of the upper body cover 1 and the lower body cover 2 are respectively closed using closing devices formed by the cap 11 and the plug 12.

Further, when repairing the piping flange anticorrosive cover, etc., the anticorrosive agent inside is discharged from the through hole 9 of the lower body cover 2.

〔Example〕

Figures 1 to 3 show the piping flange anti-corrosion cover of one embodiment of the present invention attached to the piping flange. The upper body cover 1 is made of ABS resin and has an approximately semicircular inner surface that matches the outer periphery 18 of the joint between the piping flanges 16, 16, and an approximately semicircular inner surface that matches the outer periphery 18 of the joint between the piping flanges 16, 16. A lower body cover 2 made of ABS resin formed in a semicircular shape is provided,
At both ends of the upper body cover 1 and the lower body cover 2, a fastener mounting portion 3 is provided which projects outward, respectively.
Two bolt mounting holes 4 are formed in each of the fastener mounting portions 3, and fasteners 5 made of nylon bolts and nuts are mounted in the bolt mounting holes 4, and the upper body cover 1 and one end of the
The other end of the lower body cover 2 is provided with an arcuate tongue piece 7 which is formed to become gradually thinner toward the tip, and the inner surface of the other end of the upper body cover 1 and the lower body cover An arcuate tapered part 8 into which the tongue piece 7 is inserted is formed on the inner surface of one end of the body cover 2, and a through hole formed as a screw hole is formed in the center of the upper body cover 1 and the lower body cover 2. 9 is provided in the through hole 9 of the upper body cover 1, and a closure device having a cap 11 fitted to the leak detection plug 10 is attached to the through hole 9 of the upper body cover 1, and a plug 1 is attached to the through hole 9 of the lower body cover 2.
A closure device consisting of two parts is attached.

To install this piping flange anti-corrosion cover, first clean the outer periphery 18 of the joint of the piping flanges 16, 16 and between the flange surfaces, and then apply a buffer or
A packing sheet 25 that acts as a tight fit is wrapped around the upper body cover 1 and the lower body cover 2 from the outside, and a bolt of a fastener 5 is inserted into the bolt mounting hole 4 and tightened with a nut. Then, the bolts and nuts are tightened so that the upper body cover 1 and the lower body cover 2 can always elastically press the packing sheet 25.

Next, the closure formed by the cap 11 and the plug 12 is removed, and as shown in FIG. do. When injecting the anticorrosive agent, press the hole of the leak detection stopper 10 with your fingertip and slowly inject the anticorrosive agent to check the airtightness of the piping flange anticorrosive cover. Then, when the inside is filled with the anticorrosive agent, a closing device formed by a cap 11 and a plug 12 is attached.

Then, as described above, the piping flange 16,
Since the anticorrosive petrolatum paste that is injected between the surfaces of the pipe flange 16 and maintains a fluid state has a high viscosity, it is injected from the threaded part between the bolt 21 and the nut 22 and between the nut 22 and the outer surface of the piping flange 16 to the outside. No leakage. Additionally, petrolatum paste is
Although it is possible to adjust the viscosity, as a result of experiments, even petrolatum paste whose viscosity was not adjusted did not leak to the outside from the threaded portions of the bolts 21 and nuts 22, etc.

Furthermore, by using a low viscosity anti-corrosion agent, Nut 22
If there is a risk of the anticorrosive agent leaking from the contact area, either form the nut 22 into a cap nut, or apply petrolatum paste or the like to the inside of the nut cover 23 and lid 24 shown in Figures 2 and 3. death,
There is also a method of fitting the nut cover 23 onto the nut 22 to seal the contacting portion of the nut 22 and sealing the anticorrosive agent inside the nut cover 23.

Further, the bolts 21 and nuts 22 that tighten the piping flanges 16, 16 are attached by applying petrolatum paste or the like to the inside of a nut cover 23 made of synthetic resin, and fitting and pressing the nut cover 23 onto the nut 22. The lid 24 is screwed on to seal the bolt 21 and nut 22 and prevent corrosion.

Furthermore, an upper body cover 1 and a lower body cover 2
can also be made of AAS resin or polypropylene or polyethylene or other synthetic resin. ABS resin can be molded into products with accurate dimensions, AAS resin has good weather resistance, and polypropylene, polyethylene, etc. can be molded into inexpensive and strong products. Furthermore, the base of the fastener 5 can be rotatably attached to the lower body cover 2, and furthermore, the fastener mounting portion 3 on one side of the upper body cover 1 and the lower body cover Alternatively, one of the fastener mounting portions 3 may be pivoted. The fastener 5 formed as a bolt/nut can also be made of Delrin (registered trademark), fiber-reinforced plastic, or other synthetic resin.

[Effect of idea]

In the present invention, the packing sheet 25 can be pressed by the upper body cover 1 and the lower body cover 2, which have inner surfaces that match the outer circumference 18 of the joint of the piping flanges 16, 16, so that the packing sheet 25 is not exposed to wind and rain. Since it is hard to deteriorate and is always pressed from the outside, it is possible to completely and permanently prevent rainwater, dust, etc. from entering between the surfaces of the piping flanges 16, 16.

Then, a through hole 9 for leak detection is provided in the upper body cover 1, a through hole 9 is provided in the lower body cover 2 for injecting anticorrosive agent and for draining, and each through hole 9 is closed with a closing tool. Since the anti-corrosion agent is formed to be able to maintain a fluid state between the surfaces of the piping flanges 16, 16, it is possible to inject and maintain the fluid state between the surfaces of the piping flanges 16,
Deterioration of the packing material between the surfaces of the piping flanges 16, 16 and corrosion between the surfaces can be prevented, and further,
Easy to detect leaks and drain.

Furthermore, in the event of a leak, recovery is quick as it is easy to remove.

Furthermore, since the tongue piece 7 is provided at the joint part of the upper body cover 1 and the lower body cover 2 and is tightened by inserting it into the tapered part 8, the packing sheet 25 of this part is also tightened in the same way as the other parts. It will be done.

Furthermore, even after the piping flange anti-corrosion cover is attached, the nuts 22 for tightening the piping flanges 16, 16 can be further tightened, and the structure is simple so that the sealing effect is maintained permanently.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an embodiment of the present invention attached to a piping flange, Fig. 2 is a cross-sectional side view thereof, Fig. 3 is a side view thereof, and Fig. 4 is a state in which the anticorrosive agent is injected. FIG. 5 is a cross-sectional view of the side surface of the conventional example, FIG. 6 is a cross-sectional view of another conventional example, and FIG.
The figure is a perspective view thereof. 1... Upper body cover, 2... Lower body cover, 3
... Fastener mounting part, 5 ... Fastener, 7 ... Tongue piece,
8... Tapered part, 9... Through hole, 16... Piping flange, 18... Outer periphery of joint.

Claims (1)

[Scope of utility model registration request] The upper body cover 1 has a substantially semicircular inner surface that matches the joint outer circumference 18 of the piping flanges 16, 16, and a substantially semicircular inner surface that matches the joint outer circumference 18 of the piping flanges 16, 16. A formed lower body cover 2 is provided, and this upper body cover 1
A fastener mounting part 3 is provided at each end of the upper body cover 2 and a fastener 5 is attached to the lower body cover 2. is provided with an arc-shaped tongue piece 7 which is formed to become gradually thinner toward the tip, and on the inner surface of the other end of the upper body cover 1 and the inner surface of one end of the lower body cover 2. An arc-shaped tapered part 8 is formed into which the tongue piece 7 is inserted, and the upper body cover 1 is provided with a through hole 9 for detecting leakage, and the lower body cover 2 is provided with a through hole 9 for injecting an anticorrosive agent to maintain a fluid state. ,
and a through hole 9 for drain removal, and the through hole 9
is a piping flange anti-corrosion cover formed so that it can be closed with a closing fitting.