JPS6318131B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is applicable to a water pressure test of pipes during construction of large-diameter pipelines used for inland transportation of liquids or gases, from the pipe on which the water pressure test has been completed to the pipe on which the water pressure test is to be performed next. The present invention relates to a method for supplying water for water pressure tests and a blind flange for water pressure tests used in the method.

When constructing a long-distance, large-diameter pipeline, it is necessary to conduct a water pressure test on the piping after completing piping work of an appropriate length.

In FIG. 1, a, b, c, and d are pipes for pipelines, and each pipe a, b,
For c and d, pipes a are tested after individual water pressure tests.
and pipe b, and also connect pipe c and pipe d.

Conventionally, when testing pipes a, b, c, and d, pipes a (pipes b,
(same for c and d) is closed with a blind flange e,
A pressure gauge g is attached to the outside of the blind flange e via a pressure gauge valve f. Then, water is poured into pipe a to perform a water pressure test, and when the water pressure test is completed, pipe a
The water inside will be thrown away. Since the same thing was done for other pipes b, c, and d, the same amount of water was required as the total internal volume of the pipes to be tested. Therefore, the cost of purchasing water necessary for water pressure testing, including the cost of transporting water, accounts for a large proportion of the total construction cost, and saving test water has a large effect on reducing construction costs.

In view of this, the present invention aims to save test water by allowing the test water that has been used once to be used for water pressure tests on other pipes, and to save water in the pipes after the water pressure test has been completed. Next, the water pressure is supplied to the pipe to be tested by gravity until the water level in both pipes is approximately at the same level, and the water in the pipe where the water pressure test has been completed is supplied by a pump to the pipe to be tested next. The present invention relates to a method for supplying water for testing and a blind flange for hydraulic pressure testing used in the method.

Next, an embodiment of the present invention will be explained with reference to FIGS. 3 and 4. Reference numeral 1 is a circular lid body that is attached closely to the end of the piping to be subjected to a water pressure test, as will be described later. The left side in FIG. 4 is the contact surface 2 that comes into close contact with the end of the pipe, and the opposite side is the outer surface 3.

Nozzles 4 and 5 are attached to the upper and lower outer surfaces 3 of the lid 1, and valves 6 and 7 are attached to the tips of the nozzles 4 and 5, respectively.
Further, the upper nozzle 4 is provided with an air vent valve 8 and a pressure gauge valve 9, and a pressure gauge 10 is attached to the pressure gauge valve 9.

The lid 1 of this blind flange for hydraulic pressure testing is brought into close contact with both ends of the piping to be tested for hydraulic pressure, water is poured into the piping, and the hydraulic pressure test is carried out in the same manner as in the conventional method. FIG. 5 shows the completion of the water pressure test of pipe 11, and then the beginning of the water pressure test of the next pipe 12.

In this case, the valve 7 at the tip of the nozzle 5 of the lid 1 that is in close contact with the end of the pipe 11, and the valve 7 at the tip of the nozzle 5 of the lid 1 that is in close contact with the end of the pipe 12 that is to be tested for water pressure. A short pipe 13 is connected to the valve 7 at the tip, and the valves 7, 7 and the air vent valve 8,
When 8 is opened, the water inside the pipe 11 which has completed the water pressure test flows through the nozzle 5, valve 7, short pipe 13, valve 7, and nozzle 5 into the pipe 12 where the water pressure test is to be performed next. At this time, the water in the pipe 11 will flow into the pipe 12 until the water levels in the pipes 11 and 12 are at the same level, even without using power such as a pump.

When the water in the pipes 11, 12 reaches approximately the same level, the valves 7, 7 are closed and the short pipe 13 is removed. A valve 7 is located at the tip of the nozzle 5 below the lid 1 that is in close contact with the end of the pipe 11, and a valve is located at the tip of the nozzle 4 above the lid 1 that is in close contact with the end of the pipe 12. 6, a pump 15 is connected via a hose 14 as shown in FIG. Then, the pump 15 is operated to inject the water in the pipe 11 into the pipe 12. Since the nozzle 5 communicates with the lowest part inside the pipe 11, almost all of the water in the pipe 11 can be transferred to the pipe 12.

After filling the pipe 12 with water in this way,
Close valves 6 and 7, remove hose 14, and connect pipe 1
After closing the air vent valve 8 of the lid 1 that is in close contact with the end of the pipe 12, a water pressure test of the pipe 12 is performed. When performing a water pressure test, the pressure gauge valve 9 is opened and the water pressure can be determined by the pressure gauge 10.

By repeating the above-described operations, water pressure tests can be carried out on successive pipelines without using a large number of water tank trucks or large-scale water lead-in piping.

Although FIGS. 5 and 6 show the case of one continuous pipeline, the system can also be used in a plurality of parallel pipelines.

By adopting the method of the present invention when performing a water pressure test on piping during construction of a large-diameter pipeline, the cost of purchasing water for water pressure testing and the cost of transporting water can be significantly reduced, thereby reducing construction costs. Can be done.

[Brief explanation of the drawing]

Fig. 1 is a layout diagram of pipeline piping, Fig. 2 is a longitudinal cross-sectional view of a conventional device, Fig. 3 is a front view of an embodiment of the present invention, Fig. 4 is a longitudinal cross-sectional side view of Fig. 3, and Fig. 5 is a longitudinal cross-sectional view of a conventional device.
6 are longitudinal sectional side views showing the state of use of the present invention. 1... Plate body, 2... Close contact surface, 3... Outer surface,
4, 5... Nozzle, 6, 7... Valve, 8... Air vent valve, 9... Valve for pressure gauge, 11, 12... Piping.

Claims (1)

[Claims] 1. Water in the pipe where the water pressure test has been completed is supplied by gravity to the pipe where the water pressure test is to be performed next until the water levels in both pipes are approximately at the same level, and the water in the pipe where the water pressure test has been completed is A method for supplying water for a water pressure test, characterized in that the water is supplied by a pump to piping where a water pressure test is to be performed next. 2. A nozzle for discharging or receiving water is provided below the lid that seals the end of the piping, and above the lid, the water in the piping after the water pressure test is pumped to the piping that will be subjected to the next water pressure test. A blind flange for water pressure tests used for supplying water for water pressure tests, characterized in that it is provided with a nozzle for supplying water to water pressure tests.