JP2002349800A - Safety system for pipeline for petroleum and gas - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent accidents generated by breakage of a line pipe. SOLUTION: In this safety system for a pipeline for petroleum or gas, an outer cover pipe 3 to be overlapped around a line pipe 1 with an allowance is fixed to an outer circumference of the line pipe inside at a prescribed interval through packing members 21 and 22 to form closed spaces 51 -52 surrounded by the outer circumference of the line pipe between joints and an inner circumference of the cover pipe to protect the line pipe. When petroleum or gas is leaking to jet out in a breakage accident of the line pipe, it is received into the closed space at a broken position. A sensor such as an oil sensor or gas sensor, or a pressure sensor is provided on a cover pipe wall forming each closed space to be interlocked with a sender P1 for sending signal waves to report the occurrence of the breakage accident to the external. The senders for the respective cover pipe walls generate different kinds of signal waves depending on the senders in the respective closed spaces.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to oil and city gas
The present invention relates to a system for maintaining safety of pipelines for dangerous substances such as natural gas.

[0002]

2. Description of the Related Art In the past, gas leaks caused by aging of city gas pipelines or seismic disasters, etc., which had been laid in the basement of a city in the form of a mesh, caused odors specific to city gas overflowing underground. Is sensed by people's sense of smell, and the person receiving the notification confirms and responds with a detection sensor, etc. The safety of the pipeline was such that a large number of security personnel patrol every day and night to prevent the above-mentioned leak and spill accident.

[0003]

However, the gas that has overflowed to the ground in a city gas pipeline accident described in the prior art may cause a terrible large explosion accident even with a minute electric spark or the like.・ Long and huge pipelines, such as natural gas, run through scorching deserts and frigid continents. His hard work was unimaginable.

In the present invention, therefore, an outer cover pipe that overlaps the outer periphery of a pipeline pipe (hereinafter simply referred to as a line pipe) with a margin is fixed to the outer periphery of an internal line pipe at regular intervals via a packing material. A sealed space surrounded by the outer circumference of the line pipe and the inner circumference of the cover pipe is formed between each of the nodes to protect the line pipe. Even if a breakage accident occurs and oil or gas leaks and gushes from the damaged portion, it does not flow directly to the ground or into the atmosphere.

[0005]

DETAILED DESCRIPTION OF THE INVENTION The system of the present invention will now be described in detail with reference to the drawings. First, the illustration shown in FIG. 1 and its partial detailed view in FIG. A packing material 2 ₁ 2 ₂ :: made of a thick hollow cylinder of metal or hard plastic is also fixed on the outer periphery of the hollow cylindrical line pipe 1 at regular intervals with an adhesive or the like, and a joint is formed. Knots are provided, and a cover shown by a dotted line made of soft, fiber-filled or other reinforced plastic with high anti-pressure properties, etc., which overlaps the outer periphery of the packing material 2 ₁ 2 ₂ :: in each knot with a margin over the entire length of the line pipe 1. A pipe 3 is provided, and a band 4 ₁ 4 ₂ :: made of metal or the like is placed from the outer periphery of the cover pipe 3 to the inner line pipe 1.
The packing material 2 ₁ 2 ₂ on the outer circumference is enclosed by the outer circumference of the line pipe 1 and the inner circumference of the cover pipe 3 between each of the nodes which are sealed by band-tightening the cover pipe 3 at each of the nodes. The sealed space 5 ₁ 5 ₂ 5 ₃ :: is formed to protect the line pipe 1. In addition, on the outer periphery of the cover pipe 3, a tightening position that matches the interval between the nodes on the outer periphery of the internal line pipe 1 is marked in advance so that the band can be correctly tightened at each node position. .

FIG. 3 and a partial detailed view of FIG. 4 show a hollow cylindrical line pipe 6 ₁ 6 ₂ :: of unit length such as metal or hard plastic, and its outer periphery. flange 9 _{1 9} 2 _{9 3:} the included ho Isuzu same length of metal or dotted illustration of the cover pipe 8 ₁ 8 made of plastic rigid having a threaded hole with compatible ends overlap with a margin to ₂ 8 _3: and become more and more line pipe ₆ 1 ₆ 2 :: circular cross-section of the ring-shaped packing material ₇ 1 ₇ 2: to the ho Isuzu inner circumference peripheral circle of line pipe ₆ 1 6 ₂ :: Joint 1 joined by welding or the like
The cover pipes 8 ₁ 8 ₂ 8 ₃ arranged at the approximate center of 1 :: are both end flange portions 9 ₁ 9 ₂ 9
_The packing material 7 ₁ 7 ₂ :: is strongly pressed onto the outer periphery of the line pipe 6 ₁ 6 ₂ :: by screwing of ₃ : :: between the joints provided by the pressed packing material 7 ₁ 7 ₂ ::. Sealed space 10 ₁ 1 surrounded by the outer circumference of each line pipe 6 ₁ 6 ₂ :: and the inner circumference of the cover pipe 8 ₁ 8 ₂ 8 ₃ ::
0 is obtained so as to protect the ₂ 10 _3: a formation to line pipe ₆ 1 ₆ 2 ::. As shown in FIG. 3 and FIG. 4, each packing material is strongly pressed on the outer periphery of each internal line pipe by screwing the opposing flange portions to the corner surfaces of the flange portions which intersect at right angles with both ends of each cover pipe. The corners are curved so as to form a strong pressing joint.

1 and 2 to which the system of the present invention has been applied and a sealed space is formed by a packing material previously fixed on the outer circumference of the line pipe, and the outer circumference of the sequential line pipe shown in FIG. 3 and FIG. The above description has been made on the example in which the sealed space is formed while the packing material is fixed, but the former P ₁ :: in FIG. 1 and the latter Q ₁ :: in FIG. 3 both form the respective sealed spaces. transmitter P ₁ of the signal wave in conjunction with the sensor provided for each wall on each cover pipe that ::
In Q 1 _::, the tentatively linepipe damage accident occurs, the oil sensor and gas sensor or a pressure sensor or the like oil and gas or the like in a sealed space of the breach senses quickly its inflow begin to flow into the cover The transmitter for the signal radio wave that transmits the occurrence of a breakage accident inside the pipe wall and in conjunction with the detection of the sensor is installed outside the cover pipe wall. Each type of transmitting device transmits a different type of signal radio wave.

[0008]

[Operation and Effect] The thus constructed pipeline security system of the present invention for oil or gas can be used even if a breakage accident occurs in the line pipe due to aging of the line pipe or an earthquake disaster. A sensor-linked transmission device that senses the inflow of gas and gas, etc., without having to flow directly to the ground or the atmosphere, but only into the sealed space at the damaged location without fear of a catastrophic explosion of city gas. The signal radio wave transmitted by the device receives the signal radio wave and automatically issues an alarm in the management building.Also, the installation position of each transmission device over the entire length of the line pipe and the type of signal radio wave transmitted at each position are determined. By searching the type of the signal wave of the current transmission from the computer to be stored, the linepipe administrator can determine the exact location of the linepipe accident at the same time as the linepipe accident occurs while staying in the management building. It can be to respond immediately able to grip.

Further, the system of the present invention not only protects the internal line pipe by merely providing a cover pipe on the outer periphery of the line pipe, but also seals the joints of the line pipe which accounts for most of the line pipe breakage accidents. There is an effect that it is arranged near the center of the space to prepare for the leaked effusion, and each sealed space can serve as an important buffer in the event of an earthquake disaster.

In the system of the present invention, as shown in FIG. 3 and FIG. 4, if a cover pipe made of metal is made of a zinc-iron plate having high weather resistance and a ground wire is appropriately provided in the ground, a lightning strike on the line pipe This has the effect of preventing damage due to damage.

Further, the system of the present invention is capable of partially adopting a part of a line pipe replacement work area due to aging of the pipeline or an earthquake disaster, etc. Has the effect that the monitoring can be performed completely automatically thereafter.

[Brief description of the drawings]

FIG. 1 is an explanatory view of an example in which a sealed space is formed by a packing material previously fixed on the outer periphery of a line pipe.

FIG. 2 is a partial detailed view of the explanatory view of FIG. 1;

FIG. 3 is an explanatory view of an example in which a sealed space is formed while a packing material is sequentially fixed on the outer periphery of a line pipe.

FIG. 4 is a partial detailed view of the explanatory diagram of FIG. 3;

[Explanation of symbols]

1,6 _{1, 6 2} line pipe 2 _{1, 2 2,} 7 1, _{7 2} packing material 3,8 _{1, 8} 2, _{8 3} cover pipe 4 _{1, 4 2} Band 5 _{1, 5 2,} 5 3, 10 ₁ , 10 ₂ , 10 ₃ Sealed space 9 ₁ , 9 ₂ , 9 ₃ Flange section 11 ₁ Joint section P ₁ , Q ₁ transmitter

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G01M 3/28 F16L 55/00 E

Claims (3)

[Claims] An outer cover pipe which overlaps the outer periphery of a pipe of a pipeline with a margin is fixedly provided on an outer periphery of an inner pipeline pipe at a certain interval via a packing material. A pipeline security system for oil and gas, which protects the pipeline by forming a sealed space surrounded by the outer circumference of the pipeline and the inner circumference of the cover pipe. 2. Oil and gas leaking and escaping from a damaged part in a pipeline accident due to aging of pipes or damages due to earthquake disasters, etc. are flowed into the sealed space according to claim 1 and received, and directly received on the ground or in the atmosphere. Pipeline security system for oil and gas, etc., that is prevented from flowing into the pipeline. 3. An oil sensor, a gas sensor, a pressure sensor, or the like, quickly detects oil, gas, or the like that has started to flow into the sealed space due to a breakage of the pipeline of the pipeline according to claim 2, and interlocks with the outside to detect the oil or gas. The type of signal radio wave that reports the occurrence of a breakage accident is different from each other in each sealed space. Line security system.