GB1579022A - Sealing conduits - Google Patents
Sealing conduits Download PDFInfo
- Publication number
- GB1579022A GB1579022A GB4886075A GB4886075A GB1579022A GB 1579022 A GB1579022 A GB 1579022A GB 4886075 A GB4886075 A GB 4886075A GB 4886075 A GB4886075 A GB 4886075A GB 1579022 A GB1579022 A GB 1579022A
- Authority
- GB
- United Kingdom
- Prior art keywords
- mould
- conduit
- sealant material
- wall
- pipe
- 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
-
- 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
- F16L55/168—Devices for covering leaks in pipes or hoses, e.g. hose-menders from outside the pipe
- F16L55/1683—Devices for covering leaks in pipes or hoses, e.g. hose-menders from outside the pipe by means of a patch which is fixed on the wall of the pipe by means of an adhesive, a weld or the like
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Description
(54) IMPROVEMENTS IN AND RELATING TO SEALING CONDUITS
(71) We, AVON LIPPIATT HOBBS
LIMITED, a British Company, of Penn Place,
Rickmansworth, Hertfordshire, 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 sealing conduits and especially to sealing openings, cracks and/or joints other than annular joints in a conduit.
The invention provides a method of sealing openings, cracks and/or joints other than annular joints in a conduit containing fluid at a pressure above ambient pressure, which comprises urging a mould, which does not completely surround the conduit and which contains a hardenable sealant material, against the external surface of the wall of the conduit over an opening, crack and/or joint other than an annular joint, and causing or allowing the material to harden and key onto the wall of the conduit, at least the last portion of the sealant material to be placed in the mould being introduced under pressure into the mould when in position against the external surface of the wall of the conduit, and the material being maintained under a pressure until it hardens such as to prevent the passage of fluid from the interior of the conduit through the sealant material.
The method of the invention can be used to seal externally holes, cracks or joints (other than annular joints between two lengths of pipe arranged end to end) in the wall of a pipe or to seal openings or cracks in fitments to a pipe or joints between fitments and the wall of the pipe itself. When used to seal openings or cracks in fitments the mould containing the hardenable sealant material may be urged against the external surface of the wall of the pipe over the fitment.
The term "fitment" is used throughout this
Specification to include plugs, bagplates, valves, severed ends of branch pipes and other ancillary items located in the wall of a pipe and the term "conduit" is used to include a pipe or pipeline composed of a plurality of lengths of pipe together with any fitments secured thereto.
The method of the invention can be used to seal a conduit even when there is a leakage.
By maintaining the material under a pressure such that the passage of fluid from the interior of the conduit through the sealant material is prevented during hardening, the formation of leak paths through the sealant material can be avoided and, on hardening, a seal of the opening, crack or joint can be provided and the mould removed.
The necessary pressure on the material to prevent the formation of leak paths may be provided by the force acting on the mould urging it against the wall of the conduit, or alternatively it may be provided by a source of compressed gas in communication with the sealant material. If the sealant material is one that shrinks on hardening, the pressure should be such that even on shrinkage it is still sufficient to prevent the escape of fluid from the conduit through the material. The mould may be urged against the conduit by means of a chain fixing around the conduit.
Gas in the mould prior to introduction of the sealant material is advantageously allowed to escape, as the material is introduced, through a vent positioned in the uppermost part of the mould, when in position against the wall of the conduit. The vent is preferably provided with a pressure-sensitive valve arranged to allow gas to leave the mould when the pressure of the gas in the mould is at a predetermined value, which is preferably greater than the pressure of the fluid within the conduit. With such an arrangement, as the sealant is injected into the mould, the pressure of the gas within the mould, which is initially atmospheric, increases. When it is equal to the pressure of the fluid within the conduit any outward leakage of fluid through the conduit into the mould (which will assist in bringing the pressure to this value) will cease. As further sealant material is injected, the pressure of the gas within the mould will continue to increase until it reaches the value at which the pressuresensitive valve opens. The pressure within the mould will then be retained approximately at this level until all the gas has been expelled from the mould by the sealant material. Alternatively, the vent may be provided with a manually-operable valve and a pressure gauge, and the valve is opened when the gauge shows the pressure within the mould to be above the predetermined value and closed when it falls below this value.
The sealant material is advantageously injected into the mould through a port or ports located at the lowest part of the mould when in position against the wall of the conduit. The port or ports and the air vent may all be closed when all the gas has been expelled from the mould, if the pressure on the material is to be provided by the mould itself. Alternatively, the source of compressed gas for maintaining the sealant material under pressure may be connected to one of the ports or to the air vent, while the others are closed.
The sealant material may be injected into the mould either by using a piston and cylinder device or by allowing communication between the interior of the mould and a vessel containing the sealant material, itself in communication with a source of gas at a pressure greater than the pressure of the fluid within the conduit.
The mould may be of a shape which substantially conforms to the external contours of the conduit in the region of the opening, crack or joint or may be sufficiently flexible to conform on being urged against the wall of the conduit. Thus, the mould may be made of metal, for example, steel, and may be provided with a flexible lip made, for example, of rubber around the edge which is to contact the wall of the conduit. Alternatively, the mould may be made entirely of a flexible material, for example, rubber, or it may comprise of a framework covered with a fluid-proof woven material. When the mould is flexible it is advantageously provided with a rigid backing plate which substantially conforms to the external contours of the wall of the conduit in the region of the opening crack or joint.
The viscosity of the sealant material before hardening is advantageously such that when the mould is in position against the wall of the conduit the material flows into the opening, crack or joint in the conduit wall and forms a good bond with the wall. The sealant material may either be in the form of a free-flowing liquid or it may be more viscous and have a cream-like or even a putty-like consistency. The sealant material may be obtained by mixing together two
or more components prior to application
to the external surface of the wall of the conduit, which material hardens or sets with time after mixing. Suitable materials of this kind are two part polyurethanes, polysulphides, polyester resins and pitch epoxide.
Polymeric materials for example, polychloroprene, which become plastic on being heated and harden or set on cooling may also be used, the material being heated before being placed in the mould, and polymeric materials, for example, polyurethanes, which are cured by moisture or heat or by a catalyst after being placed in the mould may also be used. In addition, macromolecular materials, for example, synthetic resins, that are curable by electromagentic radiation may be used if the mould is transparent to to the electromagnetic radiation.
The mould may be removed after the sealant material has hardened or set sufficiently to prevent the formation of leak paths and to provide a seal. This may be after a period of from a few minutes to 24 hours or even longer. If it is to be removed, then before the sealant material is placed in the mould, the mould is advantageously treated with a non-stick agent. After the sealant material has hardened sufficiently, the mould may be prised away using a tool, or pressurised fluid may be introduced between the mould and the hardened material through a port in the mould thereby releasing the moulding from the mould.
Prior to application of the sealant material to the wall of the conduit, the external surface of the wall in the region of the opening, crack or joint to be sealed is advantageously prepared either by cleaning the surface with hand or machine-operated descaling tools or buffing, or by grinding the surface, or by shot, grit or sand blasting using free or vacuum blasting techniques or by chemical cleaning by the application of a chemical agent to remove foreign or deleterious matter. Depending on the sealant material used, the surface of the conduit may also be primed or etched prior to application of the material.
One advantageous application of the invention is to sealing mains gas pipes which generally contain gas at pressures of up to 35 p.s.i. gauge. The method of the invention is, however, suitable for sealing pipes containing gas at pressures of up to about 100 p.s.i. gauge, and also water mains.
The invention also provides a conduit when sealed in accodance with the invention.
Several methods of sealing conduits in accordance with the invention will now be described by way of example with reference to the accompanying drawings, in which:
Figure 1 is a cross-section of a conduit showing diagrammatically the first method of the invention;
Figure 2 is a longitudinal section of a conduit showing the second method of the invention;
Figure 3 is a longitudinal section of a conduit including a fitment showing the third method of the invention; and
Figure 4 is a longitudinal section of a conduit having a second form of fitment showing the same method as shown in
Figure 3.
Referring to the accompanying drawings, and initially to Figure 1, a conduit comprises a mains gas pipe 1 containing gas at a pressure of up to 35 p.s.i. gauge, and a bagplate 2 secured to it by means of screws 3 to cover a hole 4 in the pipe.
In order to seal the conduit and prevent gas leakage through the joint between the pipe 1 and the bagplate 2, the external surface of the bagplate 2 and the pipe 1 in the region of the bagplate is first cleaned by grit blasting using vacuum blasting apparatus.
A mould, indicated generally by the reference numeral 5, comprising a curved steel plate 6 having a rubber sealing lip 7 around its edges is secured tightly to the outside of the conduit so that it completely covers the bagplate 2 by means of a chain 8 which extends from a hook 9 on one side of the mould 5 around the conduit to a hook 10 on the other side of the mould. Chain tensioners (not shown) are provided to tighten the chain to urge the mould 5 against the wall of the conduit.
Two components in liquid form of a suitable two-part material are then mixed together to form a sealant material 11.
The sealant material 11 is placed in a cylinder of a piston and cylinder device (not shown) and by means of a force exerted on the piston by a source of compressed air, the sealant material 11 is injected under pressure into the mould 5 through ports 12a and 12b located at the lowest level of the mould 5.
The mould 5 is also provided with an air vent 13 positioned at the uppermost part of the mould, the vent being provided with a pressure-sensitive valve 14. The valve 14 is arranged to allow gas to leave the mould 5 when the pressure of the gas in the mould is at a value higher than that of the gas within the conduit. As the sealant material 11 is injected into the mould 5 the gas pressure within the mould gradually increases until it reaches that of the gas within the conduit and at this point any outward leakage of gas from the conduit will cease. As further sealant material 11 is injected, the gas pressure within the mould 5 continues to increase until it reaches the value at which the pressure-sensitive valve 14 opens. The gas pressure within the mould 5 is then retained approximately at this level until substantially all the gas has been expelled from the mould and the formation of leak paths through the sealant material is prevented.
After the mould 5 has been filled with the sealant material 11, the pressure exerted on the material must be maintained so as to continue to prevent the formation of leak paths until the sealant material has hardened or set sufficiently. This pressure is provided by the force acting on the mould 5 urging it against the conduit, the ports 1 2a and 1 2b being capped off. This force is maintained until the sealant material has hardened or set and the chain 8 and mould 5 are then removed. If the sealant material 11 is one that shrinks on hardening the force urging the mould 5 against the conduit should be sufficient, even on shrinkage, to prevent the escape of gas from the conduit.
A second method of sealing a conduit in accordance with the invention is shown in
Figure 2. A mains gas pipe 15 has a hole filled but not sealed by a plug 16 (indicated in broken lines). A flexible dish-shaped mould 17 made of synthetic rubber having a rigid backing plate 18 is placed over the plug 16 and urged against the wall of the pipe 15 by means of chains 19 secured to the plate 18. The mould 17 has a port 20 for the injection of sealant material under pressure as in the method described with reference to Figure 1, air from the interior of the mould being allowed to escape through a vent (not shown) in the top of the mould and a corresponding duct in the plate 18, provided with a pressure-sensitive valve (not shown).
In operation, sealant material is injected into the mould 17 through the port 20 by means of a piston and cylinder arrangement in communication with a source ofcompressed air. When the mould 17 has been completely filled with sealant material and all the air expelled from the mould through the vent, pressure is maintained on the material by means of the source of compressed air which remains connected to the port 20 until the material hardens or sets. The mould 17 and plate 18 are then removed.
Referring to Figure 3, a mains gas pipe 21 containing gas at a pressure greater than atmospheric pressure has secured to it a branch pipe 22 which has been severed leaving only a short stub secured to the mains gas pipe 21. plug (not shown) is located in the branch pipe 22.
To seal the pipe 21, a flexible dish-shaped mould, indicated generally by the reference numeral 23, made of synthetic rubber and having a rigid backing plate 24, is placed over the branch pipe 22 and urged against the wall of the pipe 21 by means of chains 25 secured to the plate 24.
The mould 23 may be filled by the injection of sealant material under pressure through a port 27 as described above, air from the interior of the mould being allowed to escape through a vent 28 in the top of the mould and a corresponding duct (not shown) in the plate 24.
The sealant material is then allowed to harden or set and key on to the wall of the pipe 21 and the mould 23 then removed, leaving the branch pipe 22 encapsulated in the sealant material 26, which not only seals the end of the pipe 22, but also the joint between the pipe 22 and the pipe 21.
With reference to Figure 4 (the same reference numerals being used for the same components as in Figure 3), a similar method can be carried out to seal a pipe 21 having a fitment consisting of a ferrule 29 secured to the pipe 21 and a stub end of a branch pipe 22 secured to the ferrule, the branch pipe having a plug located therein. Both the ferrule 29 and the branch pipe 22 are encapsulated in the sealant material, which also seals the joint between the ferrule and the pipe 21.
WHAT WE CLAIM IS:
1. A method of sealing openings, cracks and/or joints other than annular joints in a conduit containing fluid at a pressure above ambient pressure, which comprises urging a mould, which does not completely surround the conduit and which contains a hardenable sealant material, against the external surface of the wall of the conduit over an opening crack and/or joint other than an annular joint, and causing or allowing the material to harden and key onto the wall of the conduit, at least the last portion of the sealant material to be placed in the mould being introduced under pressure into the mould when in position against the external surface of the wall of the conduit, and the sealant material being maintained under a pressure until it hardens such as to prevent the passage of fluid from the interior of the conduit through the sealant material.
2. A method as claimed in claim 1, wherein the openings, cracks and/or joints are holes, cracks or joints (other than annular joints between two lengths of pipe arranged end to end) in the wall of a pipe.
3. A method as claimed in claim 1, wherein the openings, cracks and/or joints are openings and/or cracks in fitments to a pipe or a joint between a fitment and the wall of the pipe, the mould containing the hardenable sealant material being urged against the external surface of the wall of the pipe over the fitment.
4. A method as claimed in any one of claims 1 to 3, wherein the sealant material is maintained under the said pressure by means only of the force acting on the mould urging it against the wall of the conduit.
5. A method as claimed in any one of claims 1 to 3, wherein the sealant material is maintained under the said pressure by means of a source of compressed gas in communication with the sealant material.
6. A method as claimed in any one of claims 1 to 5, wherein the mould is urged against the conduit by means of a chain fixing around the conduit.
7. A method as claimed in any one of claims 1 to 6, wherein gas in the mould prior to introduction of the sealant material is allowed to escape, as the material is introduced, through a vent positioned in the uppermost part of the mould, when in position against the wall of the conduit.
8. A method as claimed in claim 7, wherein the vent is provided with a pressuresensitive valve arranged to allow gas to leave the mould when the pressure of the gas in the mould is at a predetermined value.
9. A method as claimed in claim 8, wherein the predetermined value is greater than the pressure of the fluid within the conduit.
10. A method as claimed in any one of claims 1 to 9, wherein the sealant material is injected into the mould through a port or ports located at the lowest part of the mould when in position against the wall of the conduit.
11. A method as claimed in any one of claims 1 to 10, wherein the sealant material is injected into the mould by using a piston and cylinder device.
12. A method as claimed in any one of claims 1 to 11, wherein the sealant material is injected into the mould by allowing communication between the interior of the mould and a vessel containing the sealant material, itself in communication with a source of gas at a pressure greater than the pressure of the fluid within the conduit.
13. A method as claimed in any one of claims 1 to 12, wherein the mould is of a shape which substantially conforms to the external contours of the conduit in the region of the opening, crack or joint.
14. A method as claimed in any one of claims 1 to 13, wherein the mould is sufficiently flexible to conform to the external contours of the conduit on being urged against it.
15. A method as claimed in claim 14, wherein the mould is made of metal and is provided with a flexible lip around the edge in contact with the wall of the conduit.
16. A method as claimed in claim 14, wherein the mould is made entirely of a flexible material.
17. A method as claimed in claim 16, wherein the mould is provided with a rigid backing plate which substantially conforms to the external contours of the wall of the conduit in the region of the opening, crack or joint.
18. A method as claimed in any one of
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (33)
1. A method of sealing openings, cracks and/or joints other than annular joints in a conduit containing fluid at a pressure above ambient pressure, which comprises urging a mould, which does not completely surround the conduit and which contains a hardenable sealant material, against the external surface of the wall of the conduit over an opening crack and/or joint other than an annular joint, and causing or allowing the material to harden and key onto the wall of the conduit, at least the last portion of the sealant material to be placed in the mould being introduced under pressure into the mould when in position against the external surface of the wall of the conduit, and the sealant material being maintained under a pressure until it hardens such as to prevent the passage of fluid from the interior of the conduit through the sealant material.
2. A method as claimed in claim 1, wherein the openings, cracks and/or joints are holes, cracks or joints (other than annular joints between two lengths of pipe arranged end to end) in the wall of a pipe.
3. A method as claimed in claim 1, wherein the openings, cracks and/or joints are openings and/or cracks in fitments to a pipe or a joint between a fitment and the wall of the pipe, the mould containing the hardenable sealant material being urged against the external surface of the wall of the pipe over the fitment.
4. A method as claimed in any one of claims 1 to 3, wherein the sealant material is maintained under the said pressure by means only of the force acting on the mould urging it against the wall of the conduit.
5. A method as claimed in any one of claims 1 to 3, wherein the sealant material is maintained under the said pressure by means of a source of compressed gas in communication with the sealant material.
6. A method as claimed in any one of claims 1 to 5, wherein the mould is urged against the conduit by means of a chain fixing around the conduit.
7. A method as claimed in any one of claims 1 to 6, wherein gas in the mould prior to introduction of the sealant material is allowed to escape, as the material is introduced, through a vent positioned in the uppermost part of the mould, when in position against the wall of the conduit.
8. A method as claimed in claim 7, wherein the vent is provided with a pressuresensitive valve arranged to allow gas to leave the mould when the pressure of the gas in the mould is at a predetermined value.
9. A method as claimed in claim 8, wherein the predetermined value is greater than the pressure of the fluid within the conduit.
10. A method as claimed in any one of claims 1 to 9, wherein the sealant material is injected into the mould through a port or ports located at the lowest part of the mould when in position against the wall of the conduit.
11. A method as claimed in any one of claims 1 to 10, wherein the sealant material is injected into the mould by using a piston and cylinder device.
12. A method as claimed in any one of claims 1 to 11, wherein the sealant material is injected into the mould by allowing communication between the interior of the mould and a vessel containing the sealant material, itself in communication with a source of gas at a pressure greater than the pressure of the fluid within the conduit.
13. A method as claimed in any one of claims 1 to 12, wherein the mould is of a shape which substantially conforms to the external contours of the conduit in the region of the opening, crack or joint.
14. A method as claimed in any one of claims 1 to 13, wherein the mould is sufficiently flexible to conform to the external contours of the conduit on being urged against it.
15. A method as claimed in claim 14, wherein the mould is made of metal and is provided with a flexible lip around the edge in contact with the wall of the conduit.
16. A method as claimed in claim 14, wherein the mould is made entirely of a flexible material.
17. A method as claimed in claim 16, wherein the mould is provided with a rigid backing plate which substantially conforms to the external contours of the wall of the conduit in the region of the opening, crack or joint.
18. A method as claimed in any one of
claims 1 to 17, wherein the sealant material is obtained by mixing together two or more components prior to application to the external surface of the wall of the conduit, which material hardens with time after mixing.
19. A method as claimed in claim 18, wherein the sealant material is a two part polyurethane.
20. A method as claimed in claim 18, wherein the sealant material is a two part polysulphide.
21. A method as claimed in claim 18, wherein the sealant material is a two part polyester resin.
22. A method as claimed in claim 18, wherein the sealant material is a two part pitch epoxide.
23. A method as claimed in any one of claims 1 to 17, wherein the sealant material is a polymeric material which becomes plastic on being heated and hardens on cooling, and the sealant material is heated before being placed in the mould and is allowed to cool after application to the external surface of the wall of the conduit.
24. A method as claimed in claim 23, wherein the sealant material is polychloroprene.
25. A method as claimed in any one of claims 1 to 17, wherein the sealant material is a polymeric material which can be cured by moisture, or heat or by the addition of a catalyst, and is so cured after being applied to the external surface of the wall of the conduit.
26. A method as claimed in any one of claims 1 to 17, wherein the sealant material is a macromolecular material that is curable by electromagnetic radiation and the mould is transparent to the electromagnetic radiation, the sealant material being exposed to the electromagnetic radiation after being applied to the external surface of the wall of the conduit.
27. A method as claimed in any one of claims 1 to 26, wherein, prior to the sealant material being placed in the mould, the mould is treated with a non-stick agent.
28. A method as claimed in any one of claims 1 to 27, wherein after the sealant material has hardened, pressurised fluid is is introduced between the mould and the hardened material to release the moulding from the mould.
29. A method as claimed in any one of claims 1 to 28, wherein prior to applying the sealant material to the wall of the conduit, the external surface of the wall in the region of the opening, crack or joint to be sealed is cleaned.
30. A method as claimed in claim 29, wherein the surface is cleaned by shot, grit or sand blasting.
31. A method of sealing mains gas pipes as claimed in any one of claims 1 to 30.
32. A method substantially as hereinbefore described with reference to the accompanying drawings.
33. A conduit when sealed by the method as claimed in any one of claims 1 to 32.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4886075A GB1579022A (en) | 1977-02-25 | 1977-02-25 | Sealing conduits |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4886075A GB1579022A (en) | 1977-02-25 | 1977-02-25 | Sealing conduits |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1579022A true GB1579022A (en) | 1980-11-12 |
Family
ID=10450200
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4886075A Expired GB1579022A (en) | 1977-02-25 | 1977-02-25 | Sealing conduits |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1579022A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2123919A (en) * | 1982-07-16 | 1984-02-08 | Vick Limited Steve | Sealing within pipes |
| GB2282425A (en) * | 1993-09-25 | 1995-04-05 | North West Water Group Plc | Branch Connection Seal |
| GB2285596A (en) * | 1994-01-10 | 1995-07-19 | Heat Pipeline Induction Ltd | An apparatus for coating a pipe weld joint |
| GB2515351A (en) * | 2013-06-21 | 2014-12-24 | Aaron Michael Ebanks | Quick seal pipe sealer |
| CN106042287A (en) * | 2016-07-20 | 2016-10-26 | 焦祥静 | Huff joint sealing pad injection compression mold |
-
1977
- 1977-02-25 GB GB4886075A patent/GB1579022A/en not_active Expired
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2123919A (en) * | 1982-07-16 | 1984-02-08 | Vick Limited Steve | Sealing within pipes |
| GB2282425A (en) * | 1993-09-25 | 1995-04-05 | North West Water Group Plc | Branch Connection Seal |
| GB2285596A (en) * | 1994-01-10 | 1995-07-19 | Heat Pipeline Induction Ltd | An apparatus for coating a pipe weld joint |
| GB2285596B (en) * | 1994-01-10 | 1997-09-10 | Heat Pipeline Induction Ltd | An apparatus for coating a pipe weld joint |
| GB2515351A (en) * | 2013-06-21 | 2014-12-24 | Aaron Michael Ebanks | Quick seal pipe sealer |
| CN106042287A (en) * | 2016-07-20 | 2016-10-26 | 焦祥静 | Huff joint sealing pad injection compression mold |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |