SYSTEM AND METHOD PROVIDING BACK PRESSURE VALUE IN PIPE PLUGS

Abstract

Disclosed are a system and method in which the maximum back pressure determination and monitoring are provided in plugs allowing fluid and gas flow to be blocked in pipe lines with gravity flow such as sewage and rain water pipe lines.

Claims

1. A system determining how much back pressure plugs, that block fluid and gas flow in pipe lines such as sewage and rain water, can hold in any pipe where the friction coefficient between the plug and the pipe is not known, the system comprising: a friction coefficient determining system identifying the friction coefficient between the plug and the pipe to be blocked by the plug; a force measuring mechanism located in the friction coefficient determining system and allowing the plug in contact with the pipe to be pulled through the pipe; a dynamometer showing how much force is used to pull the plug in the pipe; a back pressure calculating program in which the values read in the dynamometer are entered and calculating the maximum back pressure value that the plug can hold according to the entered values.

2. The system providing back pressure value according to claim 1, further comprising back pressure notification and warning systems digitally reading the back pressure (pressure behind the plug) held by the plug and informing the user by sending the back pressure value and warning the user at the moment when the plug starts to slide in the pipe or at a pressure value set by the user.

3. The system providing back pressure value and warning according to claim 2, characterized in further comprising a sensor used in monitoring the back pressure of the plug and activating said notification and warning system (4) if the pressure value reaches the back pressure value.

4. A method allowing to know how much back pressure a plug that blocks the liquid or gas flow in the pipelines with gravity flow such as sewage and rainwater, can hold in the pipe whose friction coefficient between the plug and the pipe is not known, the method comprising the following process steps: entering the pipe and plug information to be used into a back pressure calculating program; inflating the plug such that it will be in contact with the pipe; attaching a force measuring mechanism located in a friction coefficient determining system to the inflated plug; repeating the pulling of the plug several times by applying force and writing values read in a dynamometer; entering values read in the dynamometer into the back pressure calculating program; and calculating the maximum back pressure value that the plug can hold for the pipeline application, whose values are entered in the program when the plug is inflated with the maximum working pressure, by processing all of the data of the back pressure calculating program.

5. The method according to claim 4, further comprising a process step of entering the maximum back pressure value that the plug can hold (calculated) into the back pressure notification and warning system to warn the end user.

Description

DRAWINGS ASSISTING UNDERSTANDING OF THE INVENTION

[0018] FIG. 1, is a general view of the plug disposed in the pipe and integrated with the friction coefficient determination, information and warning system.

[0019] FIG. 2, is a general view of force measuring mechanism.

[0020] FIG. 3, is a general view of the invention, the system providing the back pressure.

[0021] FIG. 4, is a flow chart of the program calculating the back pressure.

DESCRIPTION OF PART REFERENCES

[0022] 1. Friction coefficient determining system [0023] 2. Force measuring mechanism [0024] 3. Back pressure calculating program [0025] 4. Back pressure notification and warning system [0026] 10. Plug [0027] 11. Pipe [0028] 12. Dynamometer [0029] 13. Sensor

DETAILED DESCRIPTION OF THE INVENTION

[0030] In this detailed description, the preferred embodiments of the system and method providing back pressure value for the plugs of the invention are described only for a better understanding of the subject.

[0031] The invented system providing back pressure value for plugs comprises; [0032] friction coefficient determining system (1) identifying the friction force between the plug (10) and the pipe (11) to be blocked by the plug, [0033] force measuring mechanism (2) located in the friction coefficient determining system (1) and allowing the plug (10) in contact with the pipe to be withdrawn through the pipe (11), [0034] Back pressure calculating program (3) in which the values read in the dynamometer (12) are entered, calculates the pressure value that the plug (10) can hold according to the entered values, and [0035] back pressure notification systems (4) digitally reading the back pressure (pressure behind the plug) held by the plug (10) and informing the user by conveying the back pressure value and warning the user at the moment when the plug (10) starts to slide within the pipe (11) or at a pressure value set by the user.

[0036] The plugs (10) are generally used in flow exist pipelines. Therefore, the friction coefficient between the pipe (11) and the plug (10), and thus the friction force, is different for each pipeline application. That is, the friction coefficient varies from application to application. Each application has its own specific friction coefficient. If the friction coefficient between the pipe and the rubber plug in each application is known, how much back pressure it can hold in the pipe where the plug is used can be calculated. By this system and method, first the friction coefficient between the pipe and the plug will be determined, and then the obtained value will be entered into a program and how much back pressure the plug (10) holds for the pipe line application in which the values are entered will be learnt. Also, the user will be warned if the back pressure approaches the maximum level when the application is carried out.

[0037] It is important to determine the friction coefficient in the system of the invention. The friction coefficient determining system (1) is processed as follows. The user inflates the received plug (10) in the pipe at low pressure with the minimum contact surface. The force measuring device (2) will pull the plug by applying force. The force that moves the plug will be read from the dynamometer (12) in the system. The pulling force will increase in the dynamometer, and then it will decrease when the plug moves, that is, when it slides within the pipe. The maximum value it reached will be equal to the pulling force that moves the plug, and the pulling force will be equal to the friction force. In this case, since we know the friction force, contact area and inflation pressure, we can calculate the friction coefficient. When we calculate the friction coefficient, we can calculate how much back pressure the plug can hold when full operating pressure is applied.

[0038] A force value is read on the dynamometer (12) by means of the force measuring device (2) in the system (1) that determines the friction coefficient; however, it is difficult to calculate how much back pressure the plug will hold at this value without a calculation program. Therefore, it is necessary to form a calculation program that will help the user. By entering information of the force read on the dynamometer (12) in the force measuring device (2), inflation pressure, plug model and pipe diameter into the back pressure calculating program (3), how much maximum back pressure the plug will hold in the full operating pressure will be known (FIG. 4).

[0039] When using the product, the end user will learn how much back pressure the plug can hold in its pipeline by means of the foregoing system; however, there may be no chance to control this pressure. The pressure in the pipe may increase for any reason. In this case, a dangerous situation occurs. If the user can find out that the danger is approaching in advance, she/he can immediately evacuate the working area, take the necessary precautions and prevent injuries or deaths. By interfering immediately, the user can take measures to reduce the back pressure and prevent material losses. The system of the invention is also used to monitor the inflation pressure of the plug and warn the user with the back pressure notification and warning system (4).

[0040] For this purpose, there is a sensor (13) in the end of the bypass line, which is connected from the front to the back of the plug through its bypass pipe. This sensor (13) reports the value it reads to an HMI PLC and warns users if the reported value is above the back pressure value set in the control device. Since the back pressure value will be different for each application, the user must enter and set the back pressure value obtained from the back pressure calculating program (3) for each application to the back pressure notification and warning system (4).

[0041] Our system of the invention warns the user immediately when the plug starts to slide or reaches the set value mentioned above by the user. This system is as follows: since the plug is placed in the pipe where there is flow or to be tested, the water height at the back of the plug will continuously increase as the water will continuously accumulate behind the plug. Therefore, the back pressure will increase. This pressure increase can be observed from the PLC in the system. However, the back pressure will start to slide when it overcomes the friction force between the plug (10) and the pipe (11). Although this slide is very small, it will cause a decrease in the volume behind the plug and the water height will decrease. That is, the back pressure will decrease. When the sliding is over, the pressure will start increasing again and according to this pressure increase-decrease-increase, it should be understood that the plug has slid. This pressure increase and decrease are also followed from the PCL screen. That is to say, while the back pressure increases continuously, when it decreases suddenly and then starts increasing again, it means the plug has slid. This system is defined to PLC and when there is a situation as we have stated in the application, the device will notify the user and inform that the plug is sliding.

[0042] The system of the invention is a method that allows to know how much back pressure the plug can hold for any pipe line to be applied for the plugs (10) that will block the liquid or gas flow in gravity pipe lines such as sewage, rain water, and comprises the following process steps; [0043] entering the pipe (11) and plug (10) information to be used into the back pressure calculating program (3), [0044] inflating the plug (10) at a pressure such that the plug is in contact with the pipe (11), [0045] attaching the force measuring device (2) located in the friction coefficient determining system (1) to the inflated plug (10), [0046] repeating the pulling of the plug several times by applying force, writing values read in the dynamometer (12), [0047] entering the values read in the dynamometer into the back pressure calculating program, [0048] calculating the maximum back pressure value that the plug can hold for the pipeline application whose values are entered in the program when the plug is inflated with the maximum working pressure by processing all of the data of the back pressure calculating program (3), and [0049] entering the back pressure value that the plug (10) can hold (calculated) into the back pressure notification and warning system (4) to warn the end user.