GB2093139A - Electrically insulating pipe joint - Google Patents
Electrically insulating pipe joint Download PDFInfo
- Publication number
- GB2093139A GB2093139A GB8204379A GB8204379A GB2093139A GB 2093139 A GB2093139 A GB 2093139A GB 8204379 A GB8204379 A GB 8204379A GB 8204379 A GB8204379 A GB 8204379A GB 2093139 A GB2093139 A GB 2093139A
- Authority
- GB
- United Kingdom
- Prior art keywords
- ring element
- electrically insulating
- adaptor elements
- adaptor
- pipe joint
- 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.)
- Withdrawn
Links
- 239000002184 metal Substances 0.000 claims abstract description 14
- 150000001875 compounds Chemical class 0.000 claims abstract description 9
- 238000007789 sealing Methods 0.000 claims abstract description 7
- 239000012777 electrically insulating material Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 230000000295 complement effect Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 2
- 239000010959 steel Substances 0.000 claims description 2
- 238000003466 welding Methods 0.000 claims description 2
- 239000012530 fluid Substances 0.000 description 5
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- WZZBNLYBHUDSHF-DHLKQENFSA-N 1-[(3s,4s)-4-[8-(2-chloro-4-pyrimidin-2-yloxyphenyl)-7-fluoro-2-methylimidazo[4,5-c]quinolin-1-yl]-3-fluoropiperidin-1-yl]-2-hydroxyethanone Chemical compound CC1=NC2=CN=C3C=C(F)C(C=4C(=CC(OC=5N=CC=CN=5)=CC=4)Cl)=CC3=C2N1[C@H]1CCN(C(=O)CO)C[C@@H]1F WZZBNLYBHUDSHF-DHLKQENFSA-N 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
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
- F16L25/00—Construction or details of pipe joints not provided for in, or of interest apart from, groups F16L13/00 - F16L23/00
- F16L25/02—Construction or details of pipe joints not provided for in, or of interest apart from, groups F16L13/00 - F16L23/00 specially adapted for electrically insulating the two pipe ends of the joint from each other
- F16L25/03—Construction or details of pipe joints not provided for in, or of interest apart from, groups F16L13/00 - F16L23/00 specially adapted for electrically insulating the two pipe ends of the joint from each other in non-disconnectable pipe joints
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Joints With Sleeves (AREA)
Abstract
An electrically insulated pipe joint in which one length of metal pipe is electrically insulated from a succeeding length of metal pipe comprises a ring element (24) of T- shape cross section in which respective pipe end adaptor elements (10, 12) can be entered, and a cylindrical sleeve element (26) adapted to encircle the ring element and at least a part of each adaptor element with a settable sealing compound (30) filling the spaces between them. <IMAGE>
Description
SPECIFICATION
Insulating pipe joint
The invention relates to electrically insulating pipe joints and has for its object to provide an improvement therein.
Electrically insulated pipe joints in which one length of metal pipe electrically insulated from a succeeding length of metal pipe are well known.
They are used both for reasons of safety to provide an electrical break in a pipeline and in order to combat corrosion caused by electrochemical action. However, previously known electrical insulated pipe joints have generally included flanged connections between the surfaces of which fluid seals have been located, the effectiveness of the fluid seals depending on the tightness of clamping bolts connecting the flanges. Any slackening of the clamping bolts has resulted in leakage of fluid from the joint.
According to one aspect of the invention, there is provided a set of parts for making an electrically insulating pipe joint, including a pair of pipe end adaptor elements to be welded to the ends of respective lengths of metal pipe which it is required to connect together; a ring element of
T-shape cross section, said ring element being made of an electrically insulating material, the arrangement being such that the pipe end adaptor elements can be entered into the opposite ends of the ring element to abut against the abutment member constituted by the leg of the T; and a cylindrical sleeve element adapted to encircle the ring element and at least part of the length of each adaptor element with a settable sealing compound filling the spaces between the outside surfaces of the adaptor elements and the inside surface of said sleeve.The ring element of T-shape cross section and made of an electrically insulating material may be encircled by a metal shell which stiffens it. The pipe end adaptor elements will preferably be provided with respective grooves for the reception of O-ring seals which will make sealing engagement with the internal surfaces of the flanges of the
T-section ring element when the adaptor elements are entered into it. The adaptor elements will preferably each have at least one circumferential rib and the cylindrical sleeve element will preferably have internal circumferential grooves complementary to the ribs of the adaptor elements when the pipe joint has been assembled.
According to a further aspect of the invention, there is provided a method of making an electrically insulating pipe joint, including the step of welding respective pipe end adaptor elements to the ends of the lengths of metal pipe which are to be connected together; fitting the free ends of said adaptor elements into the opposite ends of a ring element of T-shape cross section made of an electrically insulating material; surrounding the ring element and at least a part of each pipe end adaptor element by a cylindrical sleeve element; and filling the spaces between the outside surfaces of the adaptor elements and the inside
surface of said sleeve with a settable sealing
compound.The method may include the step of
fitting a metal shell around the ring element of
T-shape cross section so that the latter is suitably
stiffened before the free ends of the adaptor
elements are entered into the opposite ends of
said ring element. The method will preferably also
include the prior step of fitting respective resilient
O-rings in grooves in the pipe end adaptor
elements so that, on assembly of the joint, the 0-rings make respective fluid-tight seals within
the flanges of the T-section ring element.
In order that the invention may be fully
understood and readily carried into effect, the
same will now be described, by way of example
only, with reference to the accompanying
drawings, of which:~
Fig. 1 is an exploded view of an insulating pipe joint embodying the invention,
Fig. 2 is a longitudinal section, drawn to a somewhat larger scale than Fig. 1, through the assembled joint, and
Fig. 3 is a view similar to Fig. 1 which illustrates a possible modification.
Referring now to Fig. 1 of the drawings, the pipe joint there illustrated includes a pair of pipe end adaptor elements 10 and 12 welded to the respective lengths of metal pipe 14 and 16 which
it is required to connect together. The adaptor elements have circumferential ribs 18 surrounding them and the purpose of these will be explained presently. Adjacent their free ends the adaptor elements are provided with circumferential grooves 20 for the reception of O-ring seals 22.
The pipe joint also includes a ring element 24 which is of T-shape in longitudinal section, said ring element being made of a synthetic plastics material, and a cylindrical sleeve element 26 made of metal. The cylindrical sleeve is provided with internal circumferential grooves 28 which have the same spacing as the ribs 18 of the adaptor elements 10 and 12.
Referring now to Fig. 2, it will be seen that when the joint is assembled, the free ends of the pipe end adaptor elements 10 and 12 are entered into the opposite ends of the ring element so that the O-ring seals make fluid-tight joints within the flanges of the T-section ring element. The cylindrical sleeve element 26 is then brought into the centralised position in which it is shown in Fig.
2, that is to say so that it extends equal distances in opposite directions from the T-section ring element on which it is a close fit. A settable sealing compound 30 such as resin is then used to fill the annular spaces between the
outside surfaces of the adaptor elements and the
inside surface of said sleeve. Where the size of the
assembly permits, this may be done by standing the assembly on end and pouring the settable
compound into the uppermost annular space and allowing it to set. When the first pouring has set, the assembly can then be inverted for the other annular space to be filled with the settable compound.
It has been found that the method just described of making an electrically insulating pipe joint is particularly advantageous because of the fact that the fluid seal does not depend on the tightness of clamping bolts. In fact, an electrically insulating pipe joint embodying the invention is able to permit some slight degree of articulation, to an extent determined by the resilience of the settable compound, without leakage, due to the fact that the O-rings maintain fluid tight seals even when slightly tilted relative to the cylindrical surfaces in which they are disposed. The pipe joint is very strong however. This is in part due to the fact that the settable compound is able to form a 'key' on the circumferential ribs of the pipe end adaptor elements and in the complementary grooves of the cylindrical sleeve element.
Referring now to Fig. 3, this illustrates a possible modification which may be made to the insulating pipe joint described above, the modification residing in the fact that the T-section ring element 24, which is made of a synthetic plastics material, has been provided with a tight fitting steel shell 25. Reinforced in this way, the ring element has been able to withstand the stresses imposed upon it when the free ends of the adaptor elements 10 and 12 have been entered into it.
Various other modifications may be made. For example, it is possible that if the pipe end adaptor elements are a tight push fit in the opposite ends of the T-section ring, the O-rings might not be essential. On the other hand, each pipe end adaptor element could be provided with two or more grooves for the reception of two or more
O-rings, the flanges of the T-section ring then being made appropriately longer of course.
Claims (9)
1. A set of parts for making an electrically insulating pipe joint, including a pair of pipe end adaptor elements to be welded to the ends of respectively lengths of metal pipe which it is
required to connect together; a ring element of
T-shape cross section, said ring element being
made of an electrically insulating material, the
arrangement being such that the pipe end adaptor
elements can be entered into the opposite ends of
the ring element to abut against the abutment
member constituted by the leg of the T; and a
cylindrical sleeve element adapted to encircle the
ring element and at least part of the length of each
adaptor element with a settable sealing
compound filling the spaces between the outside
surfaces of the adaptor elements and the inside
surface of said sleeve.
2. A set of parts according to claim 1, in which the ring element of T-shape cross section and made of an electrically insulating material is encircled by a metal steel which stiffens it.
3. A set of parts according to either one of the preceding claims, in which the pipe end adaptor elements are provided with respective grooves for the reception of O-ring seals which will make sealing engagement with the internal surfaces of the flanges of the T-section ring element when the adaptor elements are entered into it.
4. A set of parts according to any one of the preceding claims, in which each adaptor element has at least one circumferential rib and the cylindrical sleeve element has internal circumferential grooves complementary to the ribs of the adaptor elements when the pipe joint has been assembled.
5. A method of making an electrically insulating pipe joint, including the step of welding respective pipe end adaptor elements to the ends of the lengths of metal pipe which are to be connected together; fitting the free end of said adaptor elements into the opposite ends of a ring element of T-shape cross section made of an electrically insulating material; surrounding the ring element and at least a part of each pipe end adaptor element by a cylindrical sleeve element; and filling the spaces between the outside surfaces of the adaptor elements and the inside surface of said sleeve with a settable seating compound.
6. A method according to claim 5, of making an electrically insulating pipe joint, including the step of fitting a metal shell around the ring element of
T-shape cross section so that the latter is suitably stiffened before the free ends of the adaptor elements are entered into the opposite ends of said ring element.
7. A method according to either one of claims 5 and 6 of making an electrically insulated pipe joint, in which the method also includes the prior step of fitting respective resilient O-rings in grooves in the pipe end adaptor elements so that, on assembly of the joint, the O-rings make respective fluid-right seals within the flanges of the T-section ring element.
8. A set of parts for making an electrically insulating pipe joint, the parts being constructed and adapted to be used substantially as hereinbefore described with reference to and as illustrated by the accompanying drawings.
9. A method of making an electrically insulating pipe joint substantially as hereinbefore described with reference to and as illustrated by the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8204379A GB2093139A (en) | 1981-02-18 | 1982-02-15 | Electrically insulating pipe joint |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8105022 | 1981-02-18 | ||
| GB8204379A GB2093139A (en) | 1981-02-18 | 1982-02-15 | Electrically insulating pipe joint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2093139A true GB2093139A (en) | 1982-08-25 |
Family
ID=26278477
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8204379A Withdrawn GB2093139A (en) | 1981-02-18 | 1982-02-15 | Electrically insulating pipe joint |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2093139A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2186935A (en) * | 1985-11-26 | 1987-08-26 | Clay Cross Co Ltd | Joint |
| EP0288751A3 (en) * | 1987-04-25 | 1989-09-27 | Dornier Gmbh | Electrode for contact-free lithotripsy |
| CN105952997A (en) * | 2016-07-20 | 2016-09-21 | 辽阳给排水设备阀门有限公司 | Pouring insulating joint and manufacturing process thereof |
| WO2023040291A1 (en) * | 2021-09-15 | 2023-03-23 | 合肥海尔电冰箱有限公司 | Sealing method for refrigeration pipeline, and refrigeration pipeline |
-
1982
- 1982-02-15 GB GB8204379A patent/GB2093139A/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2186935A (en) * | 1985-11-26 | 1987-08-26 | Clay Cross Co Ltd | Joint |
| GB2186935B (en) * | 1985-11-26 | 1990-07-25 | Clay Cross Co Ltd | Joint |
| EP0288751A3 (en) * | 1987-04-25 | 1989-09-27 | Dornier Gmbh | Electrode for contact-free lithotripsy |
| CN105952997A (en) * | 2016-07-20 | 2016-09-21 | 辽阳给排水设备阀门有限公司 | Pouring insulating joint and manufacturing process thereof |
| WO2023040291A1 (en) * | 2021-09-15 | 2023-03-23 | 合肥海尔电冰箱有限公司 | Sealing method for refrigeration pipeline, and refrigeration pipeline |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |