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Abstract of JP11072409
PROBLEM TO BE SOLVED: To detect with
excellent precision a leakage position anytime and
periodically without moving operators who inspect a
leakage in a waterworks net, a gas piping, or the like
and further without needing attendant operations
such as a shield, etc., of an internal circulation
passage. SOLUTION: This is a method for detecting
a leak of water of a distributing water pipe 10 in a
water circulation state. Underwater mikes 12A, 12B
are installed at both ends of an inspection section,
and a detection signal fetched from each of the
mikes 12A, 12B is passed through a band-pass filter
to classify in each frequency band. The inspection
section is divided into n parts to set a tentative
sound source position, and waveforms having high
correlative coefficients of a signal of each band
detected by both the mikes at this tentative sound
source position are added to obtain synthesized
waveforms 16. This process is performed ranging all
sections while the tentative sound source position is
renewed, and it is decided whether a leak of water is
present or not from the synthesized waveforms at
each tentative sound source position. An object to
be applied is not only waterworks, but also a
leakage of various fluids to be detected in a gas
piping or a plant piping. An underwater mike is
detected as a sensor, and an object to be detected
is various wave motions such as a sound, a
vibration or the like which are detected through a
piping even in an internal fluid.
Abstract of US2006091876
A method for locating leaks in on-metallic pipes on
the principal of measuring and graphing the intensity
of electric fields. Leaks are located by creating a
closed circuit with a negatively charged metallic
electrode submersed in water inside a manhole
connected to the on-metallic pipe and several
positively charged metallic electrodes placed in
several reference holes in the ground above the
on-metallic pipe. A leak is determined by finding
segments of on-metallic pipe that corresponds with
greater electric field intensity measurements.
Abstract of US7013926
A plumbing pipe plug apparatus configured for
insertion into a section of pipe and adapted to
radially expand so as to engage the inner surface of
the pipe and form a positive seal therewith is
disclosed. The pipe plug is adapted with a conduit
having a check valve that opens in response to fluid
pressure to enable the injection into the plumbing
system of a pressurized fluid, such as water, to
pressurize the system downstream of the plug to
allow for leak inspection and pressure testing.
Abstract of JP2004218334
PROBLEM TO BE SOLVED: To provide a remote
controller for a corporation cock capable of restoring
the accident of a water leak in a branch pipe or the
like without being accompanied by local suspension
of water supply so that the corporation cock can be
anytime stopped without resulting in operating
impossibility due to rust, flooding, ground pressure
or the like even if years elapse.
SOLUTION: The corporation cock 2 is fixed to a
main 1 of waterworks, the branch pipe 33 is
extended in a site from the corporation cock, and in
a water-supply system providing a straight stop
valve 35, a water meter 36 or the like to the front
end of the branch pipe, a gear 13 is fixed to a pin
bar 11 projected from the corporation cock, pistons
20 and 21 are provided to both end sections, a
spindle 16 forming a rack pinion 17 engaged with
the gear in the intermediate section is provided
inside of cylinders 22 and 23 in a movable manner,
at the same time, a four-way switching valve 38 is
provided on an operating box 34 formed in the site,
a pair of pressure-resistant tubes 44 and 45 are
extended to the operating box from the cylinders to
connect the front ends of the tubes to the four-way
switching valve, and hydraulic pressure is applied to
the pistons to move the spindle back and forth to
enable the corporation cock to open and close.
COPYRIGHT: (C)2004,JPO&NCIPI
Abstract of GB2410561
A leak detector consists of a material 1 which
changes colour on contact with a fluid. The material
is attached to a pipe, 3 vessel or other container of
fluid there it may be exposed to leaks. The visible
colour change draws attention so that action may be
taken to rectify the cause of the leak. A leak detector
(11, fig. 4) which is attached to water pipes 3 for the
purpose of indicating leaking fluid, In the event that
fluid leaks or seeps from a joint 2 or other breach of
integrity of the system and flows onto the detector,
the detector activates a light, emits a noise or both.
The primary function of the device is to attract
attention by producing any one or all of: a colour
change; noise; steady illumination or flashing
illumination.
Abstract of US2005092070
A leak detection apparatus includes one or more
detection devices that envelope the various pipe
joints of a liquid circulation cooling system. In one
approach, the detection devices include a pair of
conductors separated by a wicking material
impregnated with a crystalline salt that provides a
low resistance electrical path between the
conductors in the presence of a leak. In another
approach, the detection devices include a pair of
dissimilar metal mesh electrodes separated by an
electrolyte-impregnated wicking material to form a
water-activated battery that energizes an alarm in
the presence of a leak. In either case, the electrodes
and wicking material may be encased with a wateractivated sealing material that hardens in the
presence of a leak to contain the leakage.
Abstract of US2005024215
An apparatus for permanently or semi-permanently
fitting to an underground water pipe 15,16 for
detecting leaks therein, comprises a hydrophone 26
mounted to acoustically monitor water flowing along
the pipe 15,16 and means 29 for analysing a
parameter of the output signal of the hydrophone 26
and for generating an alarm signal, in the event that
the parameter is above a maximum value or below a
minimum value. The apparatus further comprises a
radio transmitter for transmitting the alarm signal to
a remote receiver, so as to indicate the detection of
a leak. The maximum and minimum values are
preferably calculated using historical data obtained
from the hydrophone 26, so that the values are
automatically adjusted to suit location of the
apparatus. In use, a plurality of leak detection
apparatus can be installed to pipes at various
locations around a geographical area of supply.
Once a leak has been identified in an area, it is then
a relatively simple matter to more precisely
determine where in the area should be surveyed
using a conventional leak detector. Thus, the need
to survey the whole of the area using a conventional
leak detector is avoided.
Abstract of GB2406654
The size of a leak in a buried water pipe forming part of a water distribution network is assessed and
evaluated by a method which includes the measurement of the surface vibration level(s) on the ground
surface above the approximate or known position of the leak.
Abstract of CN1595089
This invention provides a pipe joint leak hunting method, especially that of pipe joint of water bottom
transmission engineering. It mainly locates the pipe joints into the apparatus full of high pressure gas inside
and measure the leak through observing the changes of the high-pressure gas. This method is simple and
convenient and quick and solves the main technique difficulty in the field.
Abstract of IE20040327
An apparatus for leak detection and prevention comprises an electrically actuable shut-off valve (11) for
connection to a water mains inlet pipe (P) and an associated fluid flow detector (12) for monitoring flow into
a water circuit. The apparatus further comprises a controller (30) for determining fluid flow rates past the
flow detector (12) and for providing a drive signal to the shut-off valve (11). The shut-off valve (11) is of the
normally-closed type so that in the absence of power, the water circuit is isolated from the mains supply. A
second electrically actuable valve (21) is provided for connection to a storage vessel or tank (V), so that
upon detection of a leak, the valve (21) is opened to drain a volume of water from the storage vessel or
tank (V) in the water circuit. A method for leak detection and prevention is also disclosed.
Abstract of CN1570455
The invention relates to a binding-style device for pipe leak stoppage. It uses seal sealed film and leak
stoppage board to realize pipe leak stoppage. It includes leak stoppage board, sealed film and binding bolt.
The sealed film is pasted in film flute on inner side of leak stoppage board. Aiming at pipeí s breach or
crack, make leak stoppage board buckle on it and press the board; then make one end of binding bolt pass
through under pipe; make lock bolts at two ends of binding bolt pass into corresponding bolt holes in wanes
at two sides of leak stoppage board; load backing and screw lock nuts. Using device described in the
invention, rapid leak stoppage of every kind of pipes can be realized and need not stop water or gas
transportation. Neední t joint and change pipes that makes operation convenient and fast. Adopting the
invention can reduce reparation time and economic loss made by pipe leak.
Abstract of JP2005133749
PROBLEM TO BE SOLVED: To provide a method
for simply discriminating size of a pipe joint, in which
size error of a joint to a pipe is eliminated, in which
work error is eliminated at each part of connection
work to the pipe, and in which generation of water
leak can be extremely reduced in connection work to
water pipes.
SOLUTION: This method is for size discrimination to
the pipe joint comprising a joint base body to
connect the pipe and a socket of resin. The sockets
are color-coded by the size. 1: the joint base body,
1a: passage, 1b: step part, 1c: O-ring, 1e: slit, 1f:
claw, 2: socket of resin, 2a: inclined inner diameter,
10: pipe.
COPYRIGHT: (C)2005,JPO&NCIPI
Abstract of US2005087234
One object of the present invention is to monitor
water pipes regularly and to detect water leaks by
using basic equipment and to provide a device that
generates an alarm when a leak occurs. The
present invention responds not only to minor leaks
that occur naturally because, for instance, a water
pipe is decrepit, but also responds to human-caused
leaks, such as those that occur because a person
forgets to turn off a water faucet or because of the
failure of equipment such as a hot-water heater. The
present invention is a leak-detection alarm system
that is composed of two main parts: (1) a leakdetecting check valve that detects movements of a
movable device that makes the same movement as
the valve element of a check valve that is attached
to a water pipe and performs switching, and that
transmits as detection signals the movement of
valve elements, and (2) a signal-processing device
that analyzes detection signals transmitted by the
leak-detecting check valve and actuates a leakdetection alarm. The leak-detecting check valve has
a main valve and an ancillary valve. The main valve
operates in response to a high rate of flow of fluid
through the pipe, such as occurs when there is a
large leak that corresponds to said human-cause
leaks, and the ancillary valve operates in response
to low rate of flow of fluid through a pipe, such as
occurs when there is a small leak that occurs
naturally.
Abstract of JP2004271407
PROBLEM TO BE SOLVED: To suppress to the
minimum a section to which gas supply is stopped,
and to detect a leak spot by performing easily an
airtightness test.
SOLUTION: A balloon 17 for airtightness provided
inside a gas hose 51 is expanded by supplied water,
and stuck on the inner wall of a gas pipe 5-1, and
separates a space between the periphery of an
inner pipe 11 and the inner wall of the gas pipe 5-1
from the gas pipe 5-1, and forms an airtight test
section. A pump 31 supplies a gas in a bomb 33 to a
pressurizing hose 27, and the gas is supplied to the
airtight test section through the pressurizing hose
27. If a leak spot P exists in the airtight test section,
a change such as pressure decline or the like in the
airtight test section is observed. When performing
the airtightness test in the test section, microphones
25-1, 25-2 detect a leak sound generated when the
gas leaks from the leak spot P.
COPYRIGHT: (C)2004,JPO&NCIPI
Abstract of US2003066340
A flood control device and system which controls
conductive fluid(s) in a conductive fluid supply line
and or path, using the conductivity of said fluid(s).
The conductive fluid system comprises; a
conductive fluid supply line, in-line conductive fluid
shut-off valve, in-line conductive fluid detector,
conductive fluid sensor(s) (attached in or to
conductive fluid dependent appliances), a D.C.
powered central processing unit, and control panel.
The conductive fluid flows through said conductive
fluid line, said in-line conductive fluid shut-off valve,
intern reaching said in-line conductive fluid detector
which detects the flow of conductive fluid, thereby
sending data to said central processing unit. When
said central processing unit receives said data, said
central processing unit delays for a predetermined
amount of time (example 3 seconds) waiting to
receive data from one or more of said conductive
fluid sensor(s). If said central processing unit doesn't
receive said data from said conductive fluid
sensor(s) within said predetermined, said central
processing unit will automatically send data to said
in-line conductive fluid shut-off valve, to close,
therefore terminating the forward flow of conductive
fluid(s). System also includes audible signal(s) to
signal an alarm condition, timing mode(s) for water
conservation and monitoring in-line conductive fluid
shut-off valve movements, a phone notifier for
notifying user of said termination of conduct fluid
due to a conductive fluid leak detection, and for
(user-set) excessive water usage, means for
communicating with said central processing unit by
way of telephonic communication (to close or reopen said in-line conductive fluid shut-off valve), a
battery back up system, and means of operating by
way of manual means.
Abstract of JP2004037414
PROBLEM TO BE SOLVED: To provide a water
leak detection device for detecting a water leak in a
building, a water pipe or the like, which is
inexpensive, operable by anyone, and can prevent
misdiagnosis.
SOLUTION: This method has a detected signal
display step n2 for converting signal data of a sound
wave or an oscillatory wave detected by a sensor 2
so as to show its spectrum and displaying the data
on a display device 6, a filtering step n4 for filtering
the detected signal data after waiting a filtering
command by a noise removing filter produced and
stored beforehand or a noise removing filter
produced based on a noise sample signal stored
beforehand, and a reduced signal display step n5 for
displaying the spectrum of a reduced signal reduced
in the filtering step n4.
COPYRIGHT: (C)2004,JPO
Abstract of JP2004012328
PROBLEM TO BE SOLVED: To provide a simple
and accurate method for determining whether water
leaks or not.
SOLUTION: A leak investigating method is applied
to a water supply pipe 3 made of lead connected to
a snap tap 2 for branching from a distributing pipe 1
for water and sewerage. The supply pipe 3
connected to the snap tap 2, is connected to a water
meter 4 via one, two or more of water shut-off
valves. Moreover, the pipe line extends from the
water meter 4 to faucets 10 prepared in a house,
factory, etc. The investigating method is applied
especially to leak investigation between the snap tap
2 and the water meter 4. To carry out the
investigating method, first of all, the shut-off valve 5
put in a box 11 is closed, and the water meter 4 is
detached from the supply pipe 3. After a
predetermined period of time, six hours for example,
passes, the shut-off valve 5 is opened, and water is
collected from there. The concentration of lead
melted in the collected water is measured, and is
compared with reference data to determine whether
or not water leaks.
COPYRIGHT: (C)2004,JPO