JPH0251036A - Checking method of liquid leak from piping - Google Patents

Abstract

PURPOSE:To easily confirm a leakage of liquid without any skill by attaching a checking paper which develops color by a chemical to a checking portion to be checked, whereby leakage of liquid in a piping can be checked from the developing degree of color of said checking paper. CONSTITUTION:A red-color litmus paper 11 which becomes blue in reaction with alkaline liquid is attached to a connecting section between a straight pipe 10 and a T-shaped joint 8 or an elbow 9 etc. from which a liquid leaks with high possibilities when a piping is done. Then, a chemical which changes the color of the litmus paper 11 into blue is poured into a raw water tank when the water is filled. The liquid in the raw water tank is filled into a piping P with pressure. After a preset time has passed, the portion of the piping P where the litmus paper 11 becomes blue is detected, and an occurrence of leakage of the liquid is confirmed by the degree of the coloring.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method for inspecting liquid leaks in piping.

[Conventional technology]

In conventional pipe leakage inspection methods, the presence or absence of liquid leakage from pipe joints and the like is visually checked.

[Problem to be solved by the invention]

However, visual confirmation of liquid leakage requires skill, and there is a risk that the confirmation work may be difficult, especially when the piping is located at a high place.

An object of the present invention is to make it possible to easily check for liquid leakage without requiring any skill.

[Means to solve the problem]

The characteristic means of the liquid leakage inspection method of piping in the present invention is that after pasting a test paper that develops color with a chemical solution to the part to be inspected of the piping, filling the pipe with the chemical liquid, and after a set time in a pressurized state, The purpose of this method is to observe the degree of color development of the test paper that develops due to seepage of the chemical solution from the piping to determine whether there is a liquid leakage, and its effects are as follows.

[For production]

In other words, if you attach test paper to the joints etc. at the same time as piping construction, you can easily observe the degree of color development of the test paper even if the part to be inspected is at a high place, without requiring any skill. In addition, compared to using a test paper that develops color with water, the test paper develops color with the chemical solution filled in the pipe, so there is no misidentification due to condensation or the like.

〔Effect of the invention〕

Therefore, it has become possible to test for liquid leaks in piping accurately without misidentification and with good workability.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

As shown in Figures 1 and 2, inside the building (1) (S) are a duct (2), a water pipe (3), a hot water supply pipe (4), and a pair of cold and hot wood pipes for air conditioning ( 5), gas pipe (6)
, and pipes (P) such as sewer pipes (7) are installed in parallel, and T
Branch piping is connected to each floor via a shape joint (8) and an elbow (9), etc., and before building (1) is completed, it will take about a week to inspect each part and check for leaks from the piping (P). Inspections, etc. will be conducted.

Therefore, a method for inspecting the liquid leakage of the pipe (P) will be explained next.

As shown in Figure 1, the connection parts between the straight pipe (10) and the T-shaped joint (8) or elbow (9), etc., where there is a particularly high possibility of liquid leakage, are colored by the alkaline liquid and turned blue. A red litmus test paper (11) that exhibits the same color is pasted during piping construction, and a chemical solution containing sodium metasilicate as a main component that turns the red litmus test paper (11) blue is dripped into the raw water tank when filling with water. Concentration 3. pflIO~10.5. Make it OOppm.

Then, fill the piping (P) with the liquid in the raw water tank under pressure, and after the set time, go around the site and use red litmus paper (1
1) Determine the blue discoloration points and check for leakage.

At this time, since sodium metasilicate is contained as a chemical solution filled in the pipe (P), it is possible to prevent corrosion of the inner wall of the metal pipe, and it is also suitable for drinking water pipes (3), hot water pipes (4), etc. It is harmless to the human body and highly safe even when used to test for liquid leaks in conduits.

Said red litmus paper (11) generally contains 0.04-0. Since only Q5wt% of azolitomine is contained, the coloring state is maintained only for a short time and the color is bleached.Therefore, in order to maintain the coloring state for a long time of at least 1 to 2 weeks, Azolitomine is concentrated and purified to contain 0.33 wt% or more.

In addition, as shown in Fig. 3, the red IJ) mass test paper (11) is coated with adhesive (12) on both edges (IIA) so that it can be easily attached to the part to be inspected of the piping (P). The surface of the adhesive (12) is covered with release paper (13) to prevent adhesion when not in use.

And a red litmus test paper (11) for the part to be inspected.
As shown in Figure 1, the method of sticking the pipe (P
), instead of wrapping it around the entire circumference, it may be wrapped only at the bottom where the seeping liquid collects.

[Separate banquet layer side]

If the pipe (P) is made of a material that does not pose a risk of corrosion, such as a pipe made of synthetic resin such as vinyl chloride, a chemical other than sodium metasilicate may be used, for example, an acidic liquid may be used. Then, blue litmus paper may be used as the test paper.

In addition, depending on the material and purpose of the pipe (P), chemical liquid and
The corresponding test strips may be used in the combinations shown in the table below.

Of the steel pipes mentioned above, 5PG (white) can be used for air conditioning pipes, drinking water pipes, etc., and SPG (black) cannot be used for drinking water pipes.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of the drawing]

In the middle of the drawings, Figure 1 is a longitudinal cross-sectional view of the shaft portion, Figure 2 is a cross-sectional view of the shaft portion, and Figure 3 is a perspective view of the test strip. (11)...Test paper, (P)...Piping.

Claims (1)

[Claims] 1. After pasting a test paper (11) that develops color with a chemical solution on the part to be inspected of the pipe (P), the pipe (P) is filled with the chemical solution and set in a pressurized state. After an hour, the pipe (P)
The test paper (11
) is a method for detecting liquid leaks in piping by observing the degree of color development. 2. The method for inspecting liquid leaks in piping according to claim 1, wherein the test paper (11) is litmus paper containing azolitomine in a weight proportion of 0.08% or more.