GB1591409A - Methods of and apparatuses for producing fluid tight joints or seals in underground pipelines - Google Patents
Methods of and apparatuses for producing fluid tight joints or seals in underground pipelines Download PDFInfo
- Publication number
- GB1591409A GB1591409A GB4864377A GB4864377A GB1591409A GB 1591409 A GB1591409 A GB 1591409A GB 4864377 A GB4864377 A GB 4864377A GB 4864377 A GB4864377 A GB 4864377A GB 1591409 A GB1591409 A GB 1591409A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pipeline
- carriage
- joint
- head
- spraying
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/22—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to internal surfaces, e.g. of tubes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
- B05B13/06—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00 specially designed for treating the inside of hollow bodies
- B05B13/0627—Arrangements of nozzles or spray heads specially adapted for treating the inside of hollow bodies
- B05B13/0636—Arrangements of nozzles or spray heads specially adapted for treating the inside of hollow bodies by means of rotatable spray heads or nozzles
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/16—Devices for covering leaks in pipes or hoses, e.g. hose-menders
- F16L55/162—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe
- F16L55/1645—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe a sealing material being introduced inside the pipe by means of a tool moving in the pipe
Description
(54) IMPROVEMENTS IN OR RELATING TO METHODS
OF AND APPARATUSES FOR PRODUCING FLUID TIGHT
JOINTS OR SEALS IN UNDERGROUND PIPELINES
(71) We, SIARGAS SOCIETA' ITALIANA ASSISTENZA RETI GAS S.p.a., of Via
Velasca 5, 20122 Milano, Italy, an Italian
Company, do hereby declare the invention, for
which we pray that a patent may be granted to
us, and the method by which it is to be
performed, to be particularly described, in and
by the following statement:
The invention relates to methods of and
apparatuses for producing fluid-tight joints or
seals in underground pipelines. It has been
found that some underground pipelines
generally made of pig iron, in particular those
belonging to an old natural or town gas pipe
network, have leaks at the junctions of the pipe sections forming the pipeline, owing to
deterioration of the joints formed when the gas
pipeline was laid.
The overall effect of such leaks is
considerable and it would be very desirable
from the economical point of view to eliminate
them. Among the methods known at present of
rejoining underground pipes, one method
includes arranging a sleeve of reinforced
polymerizable material on a mandrel, the polymerizable material being pre-catalysed
before being applied to the mandrel, inserting
the thus equipped mandrel into the pipeline
and bridging the joint to be sealed, and finally
inflating the sleeve so as to apply its outer
surface against the inner surface of the pipeline,
polymerization ensuring sticking of the sleeve
to the pipeline. This method has a number of
drawbacks both insofar as the time required for
carrying it out and the results obtained with it
are concerned. For example, it will be noted
that a joint obtained in this manner does not
perfectly follow the inner surface of the
pipeline especially when two pipe sections are
offset with respect to each other or have
different thickness. Consequently, empty
spaces exist between the sleeve and the pipeline,
which delimit weak points and are likely to give
rise to new leaks should the pressure inside the
pipeline exceed a given value. Furthermore, the
mandrel remains immobilized for a space of
time in the pipeline to start a good
polymerization process which is completed
only after a few days. Withdrawal of the
mandrel involves applying the mandrel against the sleeve which has just been produced but which has not completely polymerized with all the risks of deterioration that this implies.
According to one aspect of the invention there is provided a method of producing a fluidtight sealed joint at a pipe section junction in a pipeline, comprising the steps of cleaning the said pipe sections moving a spraying source of synthetic polymerizable material relatively rapidly along the pipeline until the presence of a joint is detected, stopping the said source beyond the joint in the direction of movement, forming a sleeve at the joint on both sides thereof by cóvering'the inner surface of adjacent ends of pipe sections joined together by supplying at a constant flow rate a spraying head carried by the said source with the said polymerizable material catalized while being sprayed, and displacing the said head at a variable and adjustable relatively slow speed with respect to the said source.
A preferred method allows the production of light seals at the joints of pipe sections in a pipeline, in particular in an underground pipeline.
In a preferred method of re-forming seals in an underground pipeline, there is obtained mechanically sturdier seals which substantially perfectly fit the inner shape of a joint in a pipeline and this is a more rapid way.
In a preferred method, after cleaning of the said pipe sections, a spraying source of synthetic polymerizable material is rapidly displaced along a pipeline until the presence of a joint is detected, the said source is stopped beyond the joint in the displacement direction, a sleeve is formed all along the joint, the inner surface of the ends of the pipe sections adjacent to the joint is coated by energizing a spraying head carried by the said source to spray at a constant flow rate, the said polymerizable material being catalized while being sprayed, and the said head is given a slow and adjustable reciprocating movement with respect to the said source.
A preferred method makes it possible to obtain junctions in underground pipes owing to intermittent operation and displacement at variable speeds of the spraying head, which makes it possible to obtain variable-thickness sleeves which substantially perfectly fit in the inner cavity formed at the junction of two pipes. Furthermore, at the joints of socket pipes the thickness of the sleeve takes the form of a fillet forming a tight lining against which the inner pressure of the pipeline acts thereby increasing adherence and tightness thereof.
According to another aspect of the invention there is provided an apparatus for performing the method according to the invention, comprising a carriage externally provided with at least two angularly spaced sets of radially extending rolling members, retractable radially extending anchoring means for resting against the inner surface of the pipeline, a spraying head connected to reservoirs of synthetic polymerizable components and arranged at the end of a longitudinal support which is slideably mounted on the carriage, detecting means for detecting a joint within a pipeline, first driving means for relatively rapidly moving the carriage, actuating means for the anchoring means, and second driving means for longitudinally displacing the support at a variable and adjustable relatively slow speed with respect to the carriage.
The support of the spraying head, the distribution head, and the control members of the anchoring means may be pneumatically actuated.
The invention will be further described, by way of example, with reference to the accompanying drawings, in which:
Figure 1 is a diagram illustrating a preferred method and apparatus;
Figure 2A is a cross-sectional view of a theoretical profile of a joint produced according to the preferred method;
Figure 2B shows the actual configuration of this joint; and
Figure 3 is a diagrammatic view in the direction of arrow F of Figure 1.
With reference to Figures 1 and 3, a pipeline 1 comprises two pipe sections la and lb joined at 2 by means of a so-called "socket joint" connection. It will be assumed that the sealing member arranged in the joint while laying the pipeline has partially disappeared, which is the cause of a leak. A carriage 3 is placed in the pipeline, the carriage being equipped with radially extending rolling members which are grouped in two sets 4a and 4b in the drawing. The rolling members may be provided in larger number and at least some of them are mounted on resilient members so as to positively rest against the inner surface of the pipeline and to ensure centring of the carriage in the pipeline at the same time.
The carriage 3 also has at one of its ends a longitudinal support 5 and a spraying head 6 for spraying a synthetic polymerizable material. In the embodiment shown, the support 5 is formed by the piston rod of a hydraulic jack the cylinder of which is fixed to the carriage 3. The piston rod can be longitudinally displaced with respect to the carriage 3 under the action of hydraulic pressure. The said support 5 too may be formed by a member which can slide under the effect of a mechanic control.
The carriage 3 also comprises anchoring means 7, e.g. formed by two radially extending shoes adapted to be forced against the inner wall of the pipeline under the action of an hydraulic, pneumatic, or mechanical mechanism. These means may also be retracted to free the carriage with respect to the pipeline for withdrawal.
It will be noted that the carriage 3 carries a probe 8 for detecting joints, i.e. breaks in the continuity of the pipeline. The probe can generate electromagnetic, or optical, or ultrasonic waves, or be formed by a mechanical sensor. Finally a device 9 for observing a finished operation or an operation being carried out is disposed on the spraying head side and may comprise for example a television camera connected to an inner circuit.
The reference numeral 10 indicates a bundle of flexible cables, hoses, or electric wires for supplying power or polymerizable material to an apparatus inserted into the pipeline 1. This bundle is connected to power sources and control and monitoring apparatuses generally indicated by 11 located at the ground surface.
Finally, an excavation is indicated by 12 through which the preferred apparatus is inserted into the pipeline and the bundle 10 extends in operation. Usually, a second excavation is dug at the other end of the length of pipeline to be repaired, through which a bundle 13 can pass.
The carriage 3 may be of various types.
The members 4a and 4b may be very simple rolling members. In this case, the bundle 10 comprises a pull cable by means of which the carriage is displaced along the pipeline. On the other hand, all or some of the members 4a and 4b may be powered by being operatively connected to a motor located on or in the carriage 3. The bundle then includes wires for supplying energy to the motor which may be an electric, hydraulic, or pneumatic motor.
The bundle also includes suitable conductors for conveying power to the anchoring means 7, as well as a conduit for supplying the jack whose support 5 is the piston rod, or any other conductor suitable for supplying the required power to a driving member controlling the movement of the support 5.
The bundle 10 also includes conductors for supplying power to a motor rotating the spraying head 6 if the latter is of rotary type, or for supplying power to eject under pressure polymerizable material through a static spraying head 6 by means of deflectors. The spraying head itself may be a jet deflecting plate.
Furthermore, the carriage 3 itself may contain reservoirs of synthetic components of the said polymerizable material, or some of them only, the remainder being supplied via conduits extending from reservoirs located on the ground surface to the spraying head by means of specific ducts included in the bundle 10.
Finally, the bundle 10 includes conductors which connect the probe 8 and the observation device 9 to control and monitor members located on the ground surface. These members may comprise a logic system for sequentially controlling the various operations the apparatus is to perform during its displacement along the pipeline to be repaired.
Before locating the preferred apparatus in the pipeline 1, it is necessary to clean the pipeline by means of a known equipment, such as by ejection of water under pressure. The carriage 3 equipped with all its accessories is then inserted through one end of the portion of pipeline 1. The carriage is caused to displace along the pipeline at a predetermined and relatively rapid speed. When the probe 8 detects a joint 2, the carriage 3 continues moving forward for a predetermined time and then stops.
The members 7 for fixing the carriage to the pipeline are then extended outwards together with the support 5, should it not be already extended. Spraying is then started by supplying the head 6 with polymerizable material at a constant flow rate while retracting the support 5. The speed of relative displacement of the said support with respect to the carriage is a function of the thickness of the layer to be formed and in particular it is lower than the speed of displacement of the carriage along the pipeline. This speed will be decreased when the support has reached a position in front of the portion 2a of the joint in order to completely fill this portion. This speed and its variations may be advantageously controlled in a predetermined way by means of a logic device in which the dimensions of the pipeline being treated have been stored, these dimensions governing the depth of the portion 2a, and thus the thickness of sealing material to be formed in that place. At the end of the retraction movement, spraying is stopped. To this end, it will be noted that it is advantageous to use a rotary spraying head whose supply of product to be sprayed will be simply cut off, while the head will continue to rotate. The polymerizable material may be a mixture of a resin or another base material and a catalyst, the mixture being formed in the spraying head itself. By keeping the head rotating after the supply has been cut off, any material affected by the catalyst will be expelled out of the head, thereby avoiding setting the material in the said head which would obstruct the head.
The observation device 9 makes it possible to check the quality of the sleeve formed during spraying and should the sprayed layer be found to be not sufficiently thick by the operator, it is possible to apply a second layer either by extending outwards the support 5, or by retrieying it a second time after having extracted it at high speed.
Once spraying has been terminated, the means 7 are released and the carriage is displaced at a relatively high speed, termed rapid approaching speed, until the next following joint is detected. A new spraying is then started at the latter joint.
Figures 2A and 2B show a longitudinal crosssectional view of a theoretical and an actual configuration, respectively, of a joint 14 obtained by carrying out the preferred method and by using the preferred apparatus. Figure 2B shows that at the zone 2a of the joint, the sealing material deeply penetrates in the joint and forms a rim 14a which reinforces the sticking effect of the sleeve thus obtained. Thus, the seal 14 has the form of a sleeve having at its middle portion a strengthening formation defining a fillet between the two pipe sections
la and lb of the pipeline. Thus, if an overpressure occurs in the pipeline, it would result in a reinforcement of the fillet effect thereby increasing tightness.
Besides the mechanical advantages due to the configuration of the sleeve and the way in which it is obtained, it should be noted that the invention makes it possible to use very rapidly polymerizing materials, thereby avoiding any risk of drop formation or running off of the sprayed material under the effect of gravity. It should also be noted that a freshly obtained seal is not subjected to passage of the carriage on it at the end of the operation, owing to the principle of operation of the apparatus, which avoids any premature deterioration or any damage which in the long run might result in a weak point in the seal.
Finally, the preferred method can be carried out in a highly automated manner, which makes it possible to save to a considerable extent labour in a working team.
The invention has applications in the field of
maintenance of urban pipeline networks, in
particular gas pipe networks, and more generally
in any underground pipeline subjected to inner
localized corrosion.
WHAT WE CLAIM IS:
1. A method of producing a fluid-tight
sealed joint at a pipe section junction in a pipeline, comprising the steps of cleaning the said pipe sections, moving a spraying source of
synthetic polymerizable material relatively
rapidly along inside the pipeline until the
presence of a joint is detected, stopping the said
source beyond the joint in the direction of
movement, forming a sleeve at the joint on
both sides thereof by covering the inner surface
of adjacent ends of pipe sectionsjoined together
by supplying at a constant flow rate a spraying
head carried by the said source with the said
polymerizable material catalized while being
sprayed, and displacing the said head at a
variable and adjustable relatively slow speed
with respect to the said source.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (15)
1. A method of producing a fluid-tight
sealed joint at a pipe section junction in a pipeline, comprising the steps of cleaning the said pipe sections, moving a spraying source of
synthetic polymerizable material relatively
rapidly along inside the pipeline until the
presence of a joint is detected, stopping the said
source beyond the joint in the direction of
movement, forming a sleeve at the joint on
both sides thereof by covering the inner surface
of adjacent ends of pipe sectionsjoined together
by supplying at a constant flow rate a spraying
head carried by the said source with the said
polymerizable material catalized while being
sprayed, and displacing the said head at a
variable and adjustable relatively slow speed
with respect to the said source.
2. An apparatus for performing the method
of claim 1, comprising a carriage externally provided with at least two angularly spaced sets of radially extending rolling members, retractable radially extending anchoring means for resting against the inner surface of the pipeline, a spraying head connected to reservoirs of synthetic polymerizable components and arranged at the end of a longitudinal support which is slidably mounted on the carriage detecting means for detecting a joint within a pipeline, first driving means for relatively rapidly moving the carriage, actuating means for the anchoring means, and second driving means for longitudinally displacing the support at a variable and adjustable relatively slow speed with respect to the carriage.
3. An apparatus as claimed in claim 2, in which the spraying head comprises at least one rotating nozzle.
4. An apparatus as claimed in claim 2, in which the spraying head is a jet deflecting plate.
5. An apparatus as claimed in any one of claims 2 to 4, in which the support comprises one of the members of an hydraulic pistoncylinder assembly.
6. An apparatus as claimed in any one of claims 2 to 5, in which the control members of the anchoring means are hydraulic.
7. An apparatus as claimed in any one of claims 2 to 4, in which the support of the spraying head, the distribution head, and the control members of the anchoring means are pneumatically actuated.
8. An apparatus as claimed in any one of claims 2 to 4, in which the energy required for rapid and slow movement and for spraying is electric.
9. An apparatus as claimed in any one of claims 2 to 8, in which the carriage is powered.
10. An apparatus as claimed in any one of claims 2 to 8, in which at least one of the sets of rolling members is powered.
11. An apparatus as claimed in any one of claims 2 to 10, in which the reservoirs of synthetic polymerizable components are carried by the carriage.
12. An apparatus as claimed in any one of claims 2 to 10, in which the carriage is supplied with synthetic polymerizable components from a mobile external reservoir by means of hoses.
13. An apparatus as claimed in any one of claims 2 to 12, in which the carriage is equipped with detecting and monitoring probes, and the said probes and their driving means are connected to a logic device arranged to perform a predetermined control.
14. A method of producing a tight sealed joint at a pipe section junction in a pipeline, substantially as hereinbefore described with reference to the accompanying drawings.
15. An apparatus for producing a tight sealed joint at a pipe section junction in a pipeline, substantially as hereinbefore described with reference to the accompanying drawings.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT2962176A IT1064336B (en) | 1976-11-22 | 1976-11-22 | PROCEDURE FOR THE FORMATION OF COATING SHEATS WITHIN CONDUCTS FOR THE TRANSPORT OF FLUIDS IN GENERAL PARTICULARLY FOR GAS DISTRIBUTION NETWORKS, AND DEVICE FOR IMPLEMENTING THE SAME PROCEDURE |
IT29709/77A IT1115746B (en) | 1977-11-15 | 1977-11-15 | PROCEDURE FOR THE REALIZATION OF WATERPROOF JOINTS IN UNDERGROUND PIPES |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1591409A true GB1591409A (en) | 1981-06-24 |
Family
ID=26328846
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB4864377A Expired GB1591409A (en) | 1976-11-22 | 1977-11-22 | Methods of and apparatuses for producing fluid tight joints or seals in underground pipelines |
Country Status (3)
Country | Link |
---|---|
DE (1) | DE2752072C2 (en) |
FR (1) | FR2371627A1 (en) |
GB (1) | GB1591409A (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU570278B2 (en) * | 1983-11-07 | 1988-03-10 | Subterra Ltd. | Spraying inside pipes |
GB2263149A (en) * | 1992-01-06 | 1993-07-14 | Commercial Resins Co | Coating pig |
WO1999049258A1 (en) * | 1998-03-25 | 1999-09-30 | Neuco, Inc. | Apparatus for internally coating live gas pipe joints or other discontinuities |
NL1012679C2 (en) * | 1999-07-23 | 2001-01-24 | Tilmar Engineering B V | System for applying a lining to the inside of pipes. |
WO2004112972A1 (en) * | 2003-06-16 | 2004-12-29 | Hunting Industrial Coatings Ltd | Dispensing apparatus |
US6966950B2 (en) | 1998-03-25 | 2005-11-22 | Winiewicz Anthony E | Method and apparatus for treating underground pipeline |
Families Citing this family (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3065441D1 (en) * | 1979-03-06 | 1983-12-08 | Tokyo Gas Co Ltd | Sealing device for a pipe joint |
CH640623A5 (en) * | 1979-09-07 | 1984-01-13 | Himmler Kunststofftechnik Ag | METHOD AND DEVICE FOR SEALING A LEAKAGE IN A NON-ACCESSIBLE, UNDERGROUND PIPELINE. |
FR2474351B1 (en) * | 1980-01-29 | 1985-05-31 | Lorraine Houilleres | WALL COATING PROJECTION DEVICE, PARTICULARLY FOR EXCAVATION |
DE3111814A1 (en) * | 1981-03-25 | 1982-10-07 | Kraftwerk Union AG, 4330 Mülheim | SELF-DRIVING TUBE MANIPULATOR FOR REMOTE CONTROLLED TRANSPORTATION OF TEST EQUIPMENT AND TOOLS LENGTH'S SPECIFIC FEED TRACKS, PREFERRED FOR NUCLEAR POWER PLANTS |
DE3153391C2 (en) * | 1981-03-25 | 1988-07-07 | Siemens Ag, 1000 Berlin Und 8000 Muenchen, De | Remote-control grinding apparatus |
DE3123376A1 (en) * | 1981-06-12 | 1983-01-05 | Manfred 2305 Heikendorf Schmidt | Method and device for repairing old underground pipelines, assembled from individual pipes |
JPS60248256A (en) * | 1984-05-25 | 1985-12-07 | Shinichi Matsuda | Apparatus for lining pipe |
DE4126310C2 (en) * | 1990-08-14 | 1994-08-25 | Klaus Stefanutti | Device for the rehabilitation of pipes laid in the ground |
DE4206623C2 (en) * | 1992-03-03 | 1995-11-23 | Rainer Hitzel | Pipe vehicle for the internal processing of installed pipelines |
DE9305022U1 (en) * | 1993-04-02 | 1994-03-24 | Jt Elektronik Gmbh | Device for the rehabilitation of inner sewer pipes with material from a centrifugal head |
DE9311145U1 (en) * | 1993-07-26 | 1994-11-24 | Siemens Ag | Device for testing or processing the inner surface of a pipeline |
CA2111876C (en) * | 1993-12-20 | 1997-09-09 | Enbridge Gas Distribution Inc. | Device for repairing pipe joints |
DE4435689A1 (en) * | 1994-10-06 | 1996-04-11 | Diga Versorgungstechnik Holdin | Internal machining device for underground pipes |
US5681131A (en) * | 1995-07-18 | 1997-10-28 | The Consumers' Gas Company Ltd. | Cable feeding system and umbilical cable therefor |
DE19641887A1 (en) * | 1996-10-10 | 1997-11-27 | Siemens Ag | Processing tool for interior surface of laid piping |
DE19850354A1 (en) * | 1998-11-02 | 2000-06-08 | Aviteq Vibrationstechnik Gmbh | Cleaning method, especially for pipes, involves passing actively driven cleaning device that fits internal dimensions of pipes and follows system geometry |
CA2374448A1 (en) | 1999-01-26 | 2000-08-03 | Dbs Beschichtung Und Systeme-Technik Gmbh | Method for coating the inside of pipes and coating system |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2894539A (en) * | 1954-12-06 | 1959-07-14 | Anthony Wayne Improvement Comp | Pipe sealing apparatus and method |
US3106491A (en) * | 1960-06-24 | 1963-10-08 | Leibner Robert | Pipe cleaning and coating apparatus |
US3135629A (en) * | 1961-07-31 | 1964-06-02 | Harvest Queen Mill & Elevator | Pipeline coating unit |
US3606913A (en) * | 1968-12-13 | 1971-09-21 | Inst Gas Technology | Apparatus for internally sealing pipes |
GB1243613A (en) * | 1969-08-08 | 1971-08-25 | Tate Pipe Lining Process Ltd | Improvements in or relating to machines for internally sealing pipe joints or flaws |
FR2228186A1 (en) * | 1974-03-29 | 1974-11-29 | Terastic | Inaccessible pipe joint remote repair system - uses trolley inside pipe carrying brushes, mortar projector, monitor camera |
-
1977
- 1977-11-22 FR FR7735074A patent/FR2371627A1/en active Granted
- 1977-11-22 DE DE19772752072 patent/DE2752072C2/en not_active Expired
- 1977-11-22 GB GB4864377A patent/GB1591409A/en not_active Expired
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU570278B2 (en) * | 1983-11-07 | 1988-03-10 | Subterra Ltd. | Spraying inside pipes |
GB2263149A (en) * | 1992-01-06 | 1993-07-14 | Commercial Resins Co | Coating pig |
WO1999049258A1 (en) * | 1998-03-25 | 1999-09-30 | Neuco, Inc. | Apparatus for internally coating live gas pipe joints or other discontinuities |
US6966950B2 (en) | 1998-03-25 | 2005-11-22 | Winiewicz Anthony E | Method and apparatus for treating underground pipeline |
NL1012679C2 (en) * | 1999-07-23 | 2001-01-24 | Tilmar Engineering B V | System for applying a lining to the inside of pipes. |
WO2001007170A1 (en) | 1999-07-23 | 2001-02-01 | Tilmar Engineering B.V. | System for coating the inner wall of tubes |
WO2004112972A1 (en) * | 2003-06-16 | 2004-12-29 | Hunting Industrial Coatings Ltd | Dispensing apparatus |
Also Published As
Publication number | Publication date |
---|---|
DE2752072A1 (en) | 1978-06-01 |
FR2371627B1 (en) | 1981-07-31 |
FR2371627A1 (en) | 1978-06-16 |
DE2752072C2 (en) | 1983-03-03 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |