JPS5839900A - Emergency control method and device for oil leakage from submarine pipeline - Google Patents

Abstract

PURPOSE:To reduce the leakage of oil when a leak accident occurs by blowing up a submarine pipeline for transforming the steel pipe to reduce its sectional area. CONSTITUTION:An explosive 6 is laid on the periphery of a steel pipe 1 of a submarine pipeline, and on the explosive 6, an ultrasonic-wave-receiving fuse 5 whose operation electricity is supplied by the electric corrosion-proof operation of a sacrifice positive electrode 8 is arranged. For preventing an erroneous operation, the ultrasonic-wave-receiving fuse 5 is operated by an ultrasonic-wave signal of a specific frequency and a previously-specified pattern. When an accident of an great amount of leakage such as cutting in the pipeline or the like occurs, the above-said specific signal of ultrasonic wave is transmitted from a patrol boat 3 or the like to operate the fuse 5. Then, the explosive 6 is blown up, and the steel pipe 1 is crushed for reducing the oil leakage.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an emergency leakage oil amount limiting method and apparatus for a submarine pipeline ν for minimizing the amount of leakage oil when a leakage accident occurs in an undersea pipeline.

If a leakage accident occurs in a long-distance submarine pipeline, the amount of oil contained in %WK is large, so closing the valves on land or at sea and only doing so will prevent the problem of excessive exchange between seawater and oil due to the difference in specific gravity. Due to this, a large amount of oil becomes shallow, m
There was an NII that said that it would seriously damage the environment of 1ll.

Due to this, in order to minimize oil leakage of 1 tl, 200 to 1,0
It is possible to install an emergency bell valve that is turned on at a pitch of 00 rx* in the rifl pipe, but the lighting, in-situ mound, and construction method for undersea pipe twins are much different from those for onshore pipelines. Therefore, the emergency layer Fr valve is
I couldn't do it. In other words, in marine IE, movable parts are susceptible to malfunction due to attached organisms (or are they operable due to hydraulic pressure, pneumatic pressure, or electric power)?
It is necessary to pull the power source at the position t of the open valve, but this is difficult in construction. Ta.

As mentioned above, there is no suitable method for controlling the amount of oil leaked in submarine pipelines, and it has been desired to establish one as soon as possible. Note that we are not talking about the small amount of leakage that occurs over a period of 11K, but rather the large amount of leakage caused by the cutting force of the steel pipe.

The present invention was invented in response to the situation described above. The amount of oil leaked is reduced by blowing up the 11FK undersea pipeline that caused the 11% leakage accident and deforming the pipe to reduce its cross-sectional area. It provides methods and meetings that limit the number of participants.

That is, in the method according to the present invention, an ultrasonic receiving fuze which is activated by ultrasonic waves No. 4Ii of a specific frequency and pattern is placed outside the steel pipe at 114*Vc* with cathodic protection as the operating voltage.
It is characterized in that the steel pipe is placed on top of the gunpowder, and the ultrasonic signal is transmitted from above to blow up the steel pipe and change its shape into a hairstyle.

-1 In addition, the steel casing according to the present invention is installed on the outer peripheral wall of the copper pipe, the gunpowder filled in the Ray casing, and the upper surface of the copper casing (attached and operating voltage The present invention is characterized by an ultrasonic receiver fuze that uses cathodic protection to cause the gunpowder to explode (by ultrasonic signals of a specific number and pattern).

An embodiment of the present invention will be described below with reference to the drawings.

In the drawing, 1 is the copper pipe of the submarine pipeline, 2 is the sea surface, 3 is the patrol boat, 4 II'i ultrasonic transmitter, 5ti ultrasonic receiver 41 fuse, 6 is gunpowder, 7 is the steel casing, 8 is the sacrificial anode, ? This is the lead wire.

The ultrasonic waves from the ultrasonic wound device 4 attached to the patrol boat 5 actuate the ultrasonic receiving fuse 5 attached to the top surface of the fI14 casing 7 made of water. When the fuse 5 is activated, the gunpowder 6 emits steam, and the steel pipe 1 is crushed by its explosive force. When the steel pipe 1 is crushed, the line will not be shredded, but the line, which had a circular cross section before the explosion, will be deformed, so at least the area of the circular cross section will become smaller. Therefore,
The amount of leakage will be less than before the explosion. Experiments have shown that this is quite effective.

Note that the operating power of the ultrasonic receiver 50 is supplied by the sacrificial anode 8 for sacrificial protection operation. In addition, in order to prevent malfunction, the frequency of the ultrasonic waves emitted by the ultrasonic transmitter 4 should be adjusted.
It is necessary to select the turn and specify the turn in advance.

For example, if a large oil leakage accident occurs due to the cutting of an undersea pipeline, first the Todoroki 1 accident will be detected using the ttts meter (TTTS meter, pressure wave type detection method) and the line operation will be stopped. Then, close the emergency shutoff valves on land and on the island:
Go to the patrol boat 3 or the IJ Cobter, transmit a predetermined ultrasonic signal from the ultrasonic transmitter 4 at the site, and blow up the steel pipe 1 of the Kfk Kei pipeline as described above.

As is clear from the above description, the qKfl structure and folds of the present invention do not require power piping from land;
In addition, since there are no moving parts, there is no possibility of biofouling, there is no need for maintenance, and the amount of leakage can be significantly reduced.

[Brief explanation of the drawing]

The drawing is a ridge view accompanying one practical theory-1 of the present invention. 1... Steel pipe, 2...? 11 planes, 6... Patrol boat, 4... Ultrasonic transmitter, 5... Ultrasonic receiving fuse, 6... Gunpowder, 7... Cageinder made of -, 8... Sacrificial anode, 9 ···Lead. Agent Patent Attorney Masatoshi Sato

Claims (1)

[Scope of Claims] (13) An ultrasonic receiving fuze, which uses cathodic protection as the operating power source and is activated by ultrasonic signals of a specific frequency and pattern, is placed on top of the gunpowder that is attached to the outer periphery of the steel pipe (11). An emergency method for limiting the amount of leaked oil in an SLK Big Twin, which involves locking the tank and detonating the gunpowder by transmitting the ultrasonic signal from the sea. (2) A steel casing installed on the outer peripheral wall of the steel pipe; ,
The trIMm is filled in the casing and is attached to the top of the Soki steel casing, and uses cathodic protection operation as the operation W- to perform a % specific frequency and putter y □ j
Undersea Pi 1 Twin Gekyuu II, characterized in that it is equipped with an ultrasonic receiving fuse that detonates the gunpowder from a message signal.
Oil leakage control device.