KR20090068191A - Sensing device for pipe connection portion - Google Patents

Sensing device for pipe connection portion Download PDF

Info

Publication number
KR20090068191A
KR20090068191A KR1020090020465A KR20090020465A KR20090068191A KR 20090068191 A KR20090068191 A KR 20090068191A KR 1020090020465 A KR1020090020465 A KR 1020090020465A KR 20090020465 A KR20090020465 A KR 20090020465A KR 20090068191 A KR20090068191 A KR 20090068191A
Authority
KR
South Korea
Prior art keywords
cover
leakage
water
pipe
gas
Prior art date
Application number
KR1020090020465A
Other languages
Korean (ko)
Other versions
KR100927464B1 (en
Inventor
윤상조
Original Assignee
윤상조
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 윤상조 filed Critical 윤상조
Priority to KR20090020465A priority Critical patent/KR100927464B1/en
Publication of KR20090068191A publication Critical patent/KR20090068191A/en
Application granted granted Critical
Publication of KR100927464B1 publication Critical patent/KR100927464B1/en

Links

Images

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16LPIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L23/00Flanged joints
    • F16L23/16Flanged joints characterised by the sealing means
    • F16L23/167Flanged joints characterised by the sealing means in connection with the appearance or detection of leaks
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00Investigating fluid-tightness of structures
    • G01M3/02Investigating fluid-tightness of structures by using fluid or vacuum
    • GPHYSICS
    • G08SIGNALLING
    • G08BSIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B25/00Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems
    • G08B25/01Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium
    • G08B25/10Alarm systems in which the location of the alarm condition is signalled to a central station, e.g. fire or police telegraphic systems characterised by the transmission medium using wireless transmission systems
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16LPIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L2201/00Special arrangements for pipe couplings
    • F16L2201/30Detecting leaks
    • GPHYSICS
    • G08SIGNALLING
    • G08CTRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C2200/00Transmission systems for measured values, control or similar signals

Abstract

A pipe connection part sensing device is provided to simplify complicated tests for water-tightness or water pressure after piping work and recognize damaged portions precisely. A pipe connection part sensing device includes a cover(1), an outlet(4), a sensor case(5), an RFID(Radio Frequency Identification)(2), a power supply line(3), and an exterior closing tape(10). The cover prevents gas or water, which is leaked from a connection part(8), from being discharged to the outside and formed with the outlet at an upper end inside. The sensor case is mounted at a lower end of the outlet for sensing the leakage. The sensor case has a sensing sheet incurring short in response to leakage and a damage sensing line(6). The RFID is mounted at a side of the sensor case per connection part and recognizes the position of leakage or the pipe. The power supply line is connected to the RFID. The exterior closing tape is covered on the cover for preventing the deviation of the cover due to gas pressure or water pressure, and prevents the leakage of gas or water between the cover and the pipe or out of contact portions(20).

Description

Sensing device for pipe connection portion

In order to monitor underground buried pipes in real time and pinpoint the location of the problem pipes, to prevent corrosion of the pipe material, insert a wire to detect breakage between the coating layers or to receive power from the outside when coating with PE or PP. In many cases, it is constructed using a detection tube that is easy to detect and detect the location of the pipeline. In order to check the abnormality occurring at the connection part of the piping material, install a cover that can be watertight so that leaked gas or leaked water does not leak to the outside, and a detection sensor that can detect gas leakage or leakage inside the cover To install the box, in order to check the pipe connecting portion RFID to install a sensor on one side of the bar, the present invention relates to a pipe connecting portion detecting device that can accurately determine whether the pipe connection damage and the pipe position.

In general, gas pipes, oil pipelines, sewer pipes, water pipes, etc., which are buried underground, are often leaked or leaked in small amounts as they age or corrode, and in this case, it is very difficult to identify them. Therefore, it is possible to confirm afterwards only when a large amount of leakage or leakage occurs, so it must be repaired or replaced at a high economic cost. In general, a problem occurs in a portion connected by welding or the like rather than a straight pipe portion, so a countermeasure is required.

In addition, in order to complete the construction process after the construction of underground buried pipes, a leak test should be conducted to check for leaks at the connection, or a hydraulic test should be performed to check for leaks. After the prescribed time has elapsed, it is checked for abnormality.

In order to perform the water pressure test, a lot of cost and time are required because water is required to be filled in the piping material.

When constructing the existing leak detection pipe, peel off some PE coated detection wire on the upper part of the structure consisting of hexahedron at the connection part and place it on the upper part. Leak detection sensor to check for leaks is used by attaching adhesive on the piping material.However, in order for the leak detection sensor to operate normally, water pressure above a certain pressure is applied to push the pressure sensor attached to the top of the hard cover made of rubber. Since water must rise up to the leak detection sensor, it is sealed with rubber to prevent leakage between the hard cover mutual contact surface and the hard cover and the outer surface contact surface of the piping material. Materials and construction costs It is more expensive, and the larger the tolerance, the more difficult it is to handle, and it is difficult to maintain perfect water tightness. In particular, there is no method to check when a gas such as gas leaks.

In order to solve the problems described above, the present invention uses an improved connection protection cover made of a light material without using bolts and nuts, the upper part of the connection cover configured to escape the gas or water to the outside Assemble the sensor box on the lower side to be connected to the cover outlet, form an outlet on the top of the sensor box, mount the RFID developed to check the position on one side of the sensor, then assemble the cover in the piping material and the cover contact Finish the part where the surface, cover and piping material meet with strong tape for watertight sealing. Then add a flexible tube made of cotton or nylon resin to prevent damage to the cover during construction or backfilling, or to prevent gas or leaking water from leaking out of the cover to any other area than the outlet. It is aimed at supplementing watertightness and protecting exterior finishes with inorganic materials such as polyurea or ceramic or epoxy compound, which is then covered or taped.

In addition, after installing a new underground buried pipe, it is possible to simply replace it with watertight test without any additional pressure test to check the stability of the pipe connection. Real-time monitoring of gas leaks, oil spills or leaks of sewage or tap water can also identify trace leaks or leaks, and there is another purpose to maintain the minimum cost by simply finding and installing leaks or leak locations.

In the present invention as a means for solving the above object can be detected in real time whether the damage of the pipe material buried underground, in the sensing device that can determine the position of the pipe, if necessary,

A cover (1) capable of watertight so that gas or leaked water leaked from the pipe member connection part (8) does not leak out;

An outlet (4) made to discharge the leaked gas or leaked water to one side of the inner upper end (1 ');

A sensor box (5) installed at the bottom of the outlet port (4) to detect leakage or leakage;

Mounted on one side of the sensing sensor box (5), watertightly processed to check the position of the piping material or the location of leaked gas or leaked water with an external reader and to help identify the existing pipe position during GIS construction or other construction. RFID 2;

A power supply line (3) connected to the RFID (2) attached to each of the pipe member (8) to supply power to the RFID (2) continuously or when necessary;

On the cover 1 to prevent the cover 1 from being separated by gas pressure or water pressure, and to prevent leakage or leakage between the portion 20 where the cover 1 contacts or between the cover 1 and the outer surface of the piping material. Having an outer surface finishing tape 10;

The sensing sensor box (5) is located in the lower end of the discharge port (4) and the detection sheet (7) for causing a short by the pressure when the leakage or leakage occurs;

And a breakage detection line 6 which is exposed to cause a short as the sensing sheet 7 is lifted up by the pressure and is located at an upper end of the inside of the sensing sensor box 5.

According to the present invention, when the underground buried pipe member is used for a long period of time, gas leakage, oil leakage, or water leakage is most likely to occur as a pipe member, and any leakage or leak can be found and handled at an early stage.

In addition, complex watertight tests or hydraulic tests, which are necessarily performed after the construction of piping materials, can be easily solved. In other words, instead of time and costly hydraulic test after piping reconstruction, by checking air pressure for connecting parts, the process of filling water inside the pipe can be omitted when performing the hydraulic test. In addition, it is possible to omit the difficult pipeline exploration process that checks the points of leakage in case of abnormality during the hydraulic tests conducted at regular distances.

In addition, by using the RFID embedded in the cover, it is possible to replace the magnetic marker installed on the piping material for GIS construction, which can greatly reduce the cost, and it is possible to accurately identify the position of the existing pipeline when constructing other pipelines. Not only can it be prevented in advance, it is also effective to pinpoint the leak location.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, if it is determined that the detailed description of the related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

1 is an overall configuration diagram of a pipe connection detecting device according to the present invention, Figure 2 is a schematic diagram of the inner bottom of the cover is sealed, Figure 4 is a block diagram of the sensor sensor box.

In the sensing device that can detect the damage of the pipe material buried underground, in real time, and can determine the position of the pipe if necessary,

Cover 1 and the cover (1) which can be watertight so that the gas leaked from the pipe material connection portion 8 or the leaked water is not leaked other than the separately designed outlet (4) and as shown in FIG. , ABS resin, compressed styrofoam, compressed polyurethane, reinforced plastic, made of at least two pages for use in the field using one or more of the coated steel sheet, the inner bottom (1 ") of the cover is characterized in that the sealing It is done.

A discharge port 4 configured to discharge these contents to the outside in the case of gas leakage or oil leakage, leakage from sewage pipes or water pipes on one side of the upper end 1 'of the cover, and an outer hole of the discharge port 4 Attach a stopper to prevent water from entering.

As shown in FIG. 4A, the sensing sensor box 5 is installed at the lower end of the outlet 4, and is peeled off at the upper inside of the sensing sensor box 5 to detect leakage or leakage. Position the breakage detection line (6), if the leakage or leakage occurs at the bottom of the inside of the sensor sensor box (5) by the pressure to the breakdown detection line (6) by the detection sheet (7) to cause a short A thin flexible plate coated with an iron component or a thin copper plate is attached to the flexible sheet to position the sensing sheet 7.

The sensing sheet 7 includes a break detection line 6 which exposes a short so as to rise due to pressure and bend up.

That is, it is connected to the damage detection line 6 wound between the PE or PP resin coating layer (pipe material outer surface coating layer 21) so as to cause a short by the sensing sheet 7 to detect the breakage of the pipe material connection part 8. A part of the coated coating line is peeled off and placed on the upper end of the sensor box 5. Thus, as shown in FIG. 4B, when the sensing sheet 7 leaks or leaks oil or leaks from water and sewage, the pressure is caused when the sensor sheet 7 exits to the outlet 4 located at the upper end 1 ′ of the cover. The sensing sheet 7 is shown to be bent toward the break detection line 6 to cause a short.

Mounted on one side of the sensor sensor box (5), the RFID (2) is water-tightly processed to help identify the location of the existing pipe during the GIS construction or other construction, or to check the location of leaked gas or leaked water, the RFID A power supply line 3 connected to the RFID 2 attached to each of the pipe member 8 is embedded in order to continuously supply power to (2) or when necessary. Therefore, the RFID 2 installed for positioning has a feature that power is not depleted even during long-term use.

The surface of the portion 20 in contact with the cover 1 and the portion in which the cover 1 is in contact with the pipe member are finished using strong tape, and the cover 1 is not separated by gas pressure or water pressure. And an outer finishing tape 10 which is covered on the cover 1 so as not to leak or leak between the portion 20 in contact with the cover 1 or the cover 1 and the outer surface of the piping material. The tape 10 may be in the form of an outer finishing tube.

In addition, the outer finishing tape 10 is a tube (sheet, tape) manufactured to have elastic properties such as a compression bandage using a thread made of cotton, nylon resin, or the like as a material. It adheres well to the cover (1), so that the cover (1) does not come off when gas pressure or hydraulic pressure is applied, or the outer surface is protected to prevent the tube from being damaged during construction or backfilling. In addition, it can also be applied to a tube or a tape using inorganic materials.

3 is a configuration in which the wick is installed on the inner bottom of the cover of the pipe connection detecting device according to the present invention.

Most of the piping materials, such as welding or fusion, are not allowed to leak after completion of construction. Therefore, the above cover (1) should be used. However, as in the case of cast iron pipes, the joining method is KP joint or Tighten method. In case of construction, it is inevitable that a minute leak occurs at the joint, and it is recognized that it can be used according to the water supply facility standard for such a slight leak, so it is necessary to develop a separate cover suitable for this. The cover for this purpose is discharged to the outside through the wick 13 of the inner bottom (1 ") of the cover when a slight leak occurs so that the sensor box (5) that detects the leakage or leakage occurs is not operated And, if only a certain amount of water leakage occurs to the outlet (4) in the upper end (1 ') inside the cover to be able to operate the sensor box (5), in order to solve these problems The cover with the wick 13 attached to the inner bottom 1 "of the cover, which can be solved by installing the wick 13 made of resin such as nylon, which does not rot in the ground, at the lower end 1" of the cover, may be provided. have.

5 is an embodiment showing a short method using a sheet containing sodium chloride or a water-expandable rubber sheet with a copper plate as a detection sensor box of a pipe connection detecting device according to the present invention.

When the detection sensor box 5 is installed in sewage pipes where no water pressure acts or indoor pipes without earth pressure or lubrication pressure,

As shown in FIG. 5B, a plurality of water inlets 9 communicating with the inside of the sensing sensor box 5 are formed, and the breakage detection is performed at an intermediate portion inside the sensing sensor box 5 having a predetermined empty space. The breakage detection line is exposed to a thick sensing sheet 7 'that exposes the line 6 and contains an ionizable substance such as sodium chloride on the upper and lower surfaces of the breakage detection line 6 exposed through water. And (6) at a predetermined interval. (For example, it can be positioned about 1cm away.)

Alternatively, as shown in FIG. 5A, a water-expandable rubber plate 7 ′ having a copper plate is installed on the upper and lower surfaces of the breakage detection line 6 to expose the water inlet 9. When water flows into the sensing sensor box 5, the sensing sheet is ionized to short-circuit the exposed breakage detection line 6 or the water-expandable rubber expands to expose the breakage detection line 6 and the copper plate. Can be contacted and shorted to detect leaks. In addition, the water-expandable rubber plate 7 'is positioned at a predetermined distance, for example, about 1 cm away from the sensor box 5, and is characterized in that both ends are fixed to the sensor box so as not to fall into an impact.

Figure 6 is a schematic diagram of a jump line dedicated tape for efficiently sending pulses to the sensing pipe away from the measuring equipment and the power supply line securely with respect to the pipe connection detection device according to the present invention.

When connecting multiple piping materials away from the measuring equipment when multiple channels are required to increase the efficiency of the measuring equipment,

A jump line should be connected to a distance away from the measuring equipment, and the pulses emitted from the measuring equipment are equal to the interval of the breakage detecting line 6 inserted between the main coating layers in order to function effectively. The power supply line 3 should also be connected in the same state as the breakage detection line 6, the breakage detection line (6) consisting of two strands of copper wire or one strand of optical cable to maintain a certain interval and In addition, the power supply line (3) made of a copper wire and spaced apart from the damage detection line (6) is attached to use a further provided with a dedicated tape 12 extending to a long distance.

In addition, the dedicated tape 12 must be connected to the pipe material hundreds of meters or more away from the measuring device on the ground or underground site, so damage due to other construction, or function may deteriorate due to deterioration of the material when used for a long time. In order to protect the tape 12 from the outside, it is characterized in that the tape 12 is installed inside a protective tube (not shown) for a long distance connection using a material such as PE or PP or PVC resin on the outer surface. This is to select the corresponding one according to the type and shape, and the shape and size is not limited.

7 is a schematic view of a closed tube of the pipe connection detecting device according to the present invention.

5 is a tube that can be conveniently used to detect leaks or leaks using the sensor box (5) of FIG. It is provided with a closed tube (11) made to ensure watertightness with a material such as vinyl or PE resin instead of the cover (1) where it is impossible or improper to use the cover.

In addition, the sealed tube 11 is made of a vinyl or rubber material that ensures watertightness so that water or oil inside does not come out, and air or water outside the tube does not flow in, but air or water inside the tube goes outside. A discharge port 4 that can flow out is installed in the middle of the tube, and both sides of the tube are opened to form a cylindrical shape in which the inside of the tube communicates.

Such a sealed tube can be effectively used to prevent corrosion of the pipe material connection portion does not maintain the function, such as leak detection.

As described above, preferred embodiments according to the present invention have been described, but the present invention is not limited to the above-described embodiments, and the present invention is not limited to the scope of the present invention as claimed in the following claims. Anyone with knowledge of the present invention will have the technical spirit of the present invention to the extent that various modifications can be made.

1 is an overall configuration diagram of a pipe connection detecting device according to the present invention.

Figure 2 is a schematic view of the inner bottom of the cover of the pipe connection detecting device according to the invention is sealed.

Figure 3 is a schematic view of the wick installed on the inner bottom of the cover of the pipe connection detection device according to the invention.

Figure 4 is a block diagram of a detection sensor box of the pipe connection detection device according to the invention.

5 is an embodiment showing a short method using a sheet containing sodium chloride or a water-expandable rubber sheet with a copper plate attached to the sensing sensor box of the pipe connection detecting device according to the present invention.

Figure 6 is a schematic diagram of a jump line dedicated tape for protecting the power supply line to the sensing pipe far away from the measuring equipment with respect to the pipe connection detection device according to the present invention.

7 is a schematic view of a closed tube of the pipe connection detecting device according to the present invention.

** Main Names of Drawings **

1: cover 2: RFID

3: power supply line 4: outlet

5: detection sensor box 6: damage detection wire

8: Plumbing Connection 9: Water Inlet

Claims (1)

  1. In the sensing device that can detect the damage of the pipe material buried underground, in real time, and can determine the position of the pipeline if necessary,
    A cover (1) capable of watertight so that gas or leaked water leaked from the pipe member connection part (8) does not leak out;
    An outlet (4) made to discharge the leaked gas or leaked water to one side of the inner upper end (1 ');
    A sensor box (5) installed at the bottom of the outlet port (4) to detect leakage or leakage;
    Mounted on one side of the sensing sensor box (5), watertightly processed to check the position of the piping material or the location of leaked gas or leaked water with an external reader and to help identify the existing pipe position during GIS construction or other construction. RFID 2;
    A power supply line (3) connected to the RFID (2) attached to each of the pipe member (8) to supply power to the RFID (2) continuously or when necessary;
    On the cover 1 to prevent the cover 1 from being separated by gas pressure or water pressure, and to prevent leakage or leakage between the portion 20 where the cover 1 contacts or between the cover 1 and the outer surface of the piping material. Having an outer surface finishing tape 10;
    The sensor box (5) is located at the lower end of the outlet (4) and attach a thin flexible plate or a thin copper plate coated with iron so as to cause a short by the pressure when the leakage or leakage occurs Sensing sheet (7) made by attaching to a flexible sheet;
    Coated coating is located on the inner top of the sensor sensor box 5 to detect breakage of the pipe material connection part 8 and connected to cause a short as the sensor sheet 7 is raised up by the pressure. Breakage detection line (6) is a part of the stripped line; piping material connecting device configured to include.
KR20090020465A 2009-03-10 2009-03-10 Piping connecting sensing device KR100927464B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR20090020465A KR100927464B1 (en) 2009-03-10 2009-03-10 Piping connecting sensing device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR20090020465A KR100927464B1 (en) 2009-03-10 2009-03-10 Piping connecting sensing device

Publications (2)

Publication Number Publication Date
KR20090068191A true KR20090068191A (en) 2009-06-25
KR100927464B1 KR100927464B1 (en) 2009-11-19

Family

ID=40995765

Family Applications (1)

Application Number Title Priority Date Filing Date
KR20090020465A KR100927464B1 (en) 2009-03-10 2009-03-10 Piping connecting sensing device

Country Status (1)

Country Link
KR (1) KR100927464B1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101119825B1 (en) * 2009-11-27 2012-02-28 (주)유민에쓰티 Apparatus for sensing the leak a pipe connection part using capacitive sensor
KR101119823B1 (en) * 2009-11-27 2012-02-28 (주)유민에쓰티 Apparatus for sensing the leak a pipe connection part
KR101352874B1 (en) * 2011-12-07 2014-01-21 (주) 삼정디씨피 Pipe for detecting water leakage attached housing of clamp

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101598760B1 (en) * 2015-07-08 2016-03-03 한국전력공사 Underground pipeline spacer included location detection device
KR101647269B1 (en) 2016-02-24 2016-08-23 신이피엔씨 주식회사 Method and apparatus for manufacturing leakage detecting sensor pipe
US10151695B2 (en) 2017-03-16 2018-12-11 Oetiker Ny, Inc. Optical assurance cap
KR101971473B1 (en) * 2017-11-27 2019-08-13 주식회사 코위드원 Tube defect detection sensor and defect detection system using the same

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006200919A (en) * 2005-01-18 2006-08-03 Shimizu Corp Water leakage detecting element and water leakage detecting system using it

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101119825B1 (en) * 2009-11-27 2012-02-28 (주)유민에쓰티 Apparatus for sensing the leak a pipe connection part using capacitive sensor
KR101119823B1 (en) * 2009-11-27 2012-02-28 (주)유민에쓰티 Apparatus for sensing the leak a pipe connection part
KR101352874B1 (en) * 2011-12-07 2014-01-21 (주) 삼정디씨피 Pipe for detecting water leakage attached housing of clamp

Also Published As

Publication number Publication date
KR100927464B1 (en) 2009-11-19

Similar Documents

Publication Publication Date Title
US5927762A (en) Pipe coupling assembly system and method
FI93390B (en) The doubly sealed fluid transfer system
US5911155A (en) Connecting device for pipe assemblies
US4932257A (en) Double wall piping system
US6116817A (en) Hydrocarbon fuel piping system with a flexible inner pipe and an outer pipe
US4708015A (en) Storage tanks with secondary containment means and non-visual leak detection means
US5722699A (en) Flexible entry seal arrangement
US4568925A (en) Subterranean tank leak detection system and method
US5865216A (en) System for housing secondarily contained flexible piping
US4870856A (en) Split fittings useful in forming a secondary semi-rigid pipeline over primary pipelines
CA2444782A1 (en) Method and apparatus for leak detection and location
US4871084A (en) Tank secondary containment system
US4939923A (en) Method of retrofitting a primary pipeline system with a semi-rigid pipeline
US5427474A (en) Double containment piping system and centralization seal therefor
US5176025A (en) Pipeline secondary containment system and method
GB2186341A (en) Improvements in and relating to hose leak detectors
US9267636B2 (en) Protective liner with wear detection
EP0875006A1 (en) Sewage system with electronic marker
US6823886B2 (en) Dispenser containment
US7011102B2 (en) Contained pipeline system with brine filled interstitial space and method for detecting leakage in same
US4865220A (en) Double wall tank fittings
US5529668A (en) Detection of potential for corrosion of steel reinforced composite pipe
US4408628A (en) System and method for repair of leaking storage tanks containing fluids which contaminate ground water
US5955657A (en) Pipe layout with opposing incline
US7500489B2 (en) Contained pipeline system with brine filled interstitial space and method for detecting leakage in same

Legal Events

Date Code Title Description
A107 Divisional application of patent
A201 Request for examination
E902 Notification of reason for refusal
E701 Decision to grant or registration of patent right
GRNT Written decision to grant
FPAY Annual fee payment

Payment date: 20121113

Year of fee payment: 4

FPAY Annual fee payment

Payment date: 20131031

Year of fee payment: 5

FPAY Annual fee payment

Payment date: 20141111

Year of fee payment: 6

FPAY Annual fee payment

Payment date: 20151110

Year of fee payment: 7

FPAY Annual fee payment

Payment date: 20161110

Year of fee payment: 8

FPAY Annual fee payment

Payment date: 20171110

Year of fee payment: 9

FPAY Annual fee payment

Payment date: 20191111

Year of fee payment: 11