CA1047064A - Heat insulated pipe arrangement and method of assembling components of this arrangement - Google Patents
Heat insulated pipe arrangement and method of assembling components of this arrangementInfo
- Publication number
- CA1047064A CA1047064A CA254,874A CA254874A CA1047064A CA 1047064 A CA1047064 A CA 1047064A CA 254874 A CA254874 A CA 254874A CA 1047064 A CA1047064 A CA 1047064A
- Authority
- CA
- Canada
- Prior art keywords
- end portion
- coupling
- inner core
- seal
- axially
- 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
- F16L59/00—Thermal insulation in general
- F16L59/14—Arrangements for the insulation of pipes or pipe systems
- F16L59/16—Arrangements specially adapted to local requirements at flanges, junctions, valves or the like
- F16L59/18—Arrangements specially adapted to local requirements at flanges, junctions, valves or the like adapted for joints
- F16L59/182—Joints with sleeve or socket
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Thermal Insulation (AREA)
- Joints With Sleeves (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Pipe Accessories (AREA)
- Coating Apparatus (AREA)
Abstract
HEAT INSULATED PIPE ARRANGEMENT AND
METHOD OF ASSEMBLING COMPONENTS
OF THIS ARRANGEMENT
Abstract of the Disclosure A pipe arrangement is disclosed herein and includes a heat insulated pipe having an inner cylindrical core which itself includes an axially projecting exposed end section.
The arrangement also includes a coupling, one end portion of which is connected concentrically around the axially pro-jecting core portion of the heat insulated pipe. A cured room temperature vulcanizing material, preferably silicone or similar heat resistant rubber, extends axially between circumferential segments of the coupling and axially pro-jecting core portion and also extends radially outwardly from the inner core of the pipe between an outer end portion of the pipe and adjacent end of the coupling. This vulcan-izing material, in its uncured state, is utilized in assem-bling together the heat insulated pipe and coupling.
METHOD OF ASSEMBLING COMPONENTS
OF THIS ARRANGEMENT
Abstract of the Disclosure A pipe arrangement is disclosed herein and includes a heat insulated pipe having an inner cylindrical core which itself includes an axially projecting exposed end section.
The arrangement also includes a coupling, one end portion of which is connected concentrically around the axially pro-jecting core portion of the heat insulated pipe. A cured room temperature vulcanizing material, preferably silicone or similar heat resistant rubber, extends axially between circumferential segments of the coupling and axially pro-jecting core portion and also extends radially outwardly from the inner core of the pipe between an outer end portion of the pipe and adjacent end of the coupling. This vulcan-izing material, in its uncured state, is utilized in assem-bling together the heat insulated pipe and coupling.
Description
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METHOD OF ASSEMBLING COMPONENTS
OF THIS ARRANGEMENT
Background of the Invention The present invention relates generally to a pipe arrangement and more particularly to a speciFic heat insulated pipe arrangement and method of assembling components of this arrangement.
Where conduit service is provided for carrying warm to hot fluids, for example, fluids reaching tempera-tures between 50F and 250F, it is sometimes necessary to use what is commonly referred to as heat insulated conduit.
A typical conduit or pipe of this type includes an inner core constructed of for example steel, an outer protective casing or core constructed of, for example, asbestos-cement and an intermediate layer of insulation material. Typically, the inner steel core includes opposite end portions which ~ ?
project axially beyond the layer of insulation and outer protective casing and also typically includes end seals -positioned against opposite ends of the insulation layer around these projecting end portions to seal the insulation between the inner core and outer casing.
Two conduits or pipes of this type are typically connected together by means of a coupling constructed of, for example, asbestos-cement. This coupling includes opposite end portions and axially spaced annular seals located concen-trically in the inner surface of the coupling and spaced from the opposite ends thereof. One end portion of this coupling is concentrically positioned around an axially projecting inner core portion of one of the conduits or pipes so that the free end of this end portion engages against the associated : ' ,' ~ .', .
., . . ' . , , '. .. ' .................. . . . .
. .
~47~4 1 end seal and such that one of the annular seals engages around the projecting portion of the associated inner core.
The other end portion of the coupling is assembled to the other pipe or conduit in the same manner.
As will be seen hereinafter, the present invention is directed to a pipe arrangement generally similar to the one just described but one which has both physical and assembly advantages over the prior art.
Summary of the Invention An object of the present invention is to provide a heat insulated pipe arrangement which includes a heat insulated pipe and coupling and which includes a reliable moisture and corrosion seal between this pipe end coupling.
Another object of the present invention is to provide a seal of the last mentioned type which compensates for any expansion and contraction of the inner core of the conduit or pipe, which expansion and contraction may occur if the core is constructed of For example steel.
Still another object of the present invention is ~o provide an uncomplicated and yet reliable method of assemblying together the heat insulated conduit or pipe and coupling just discussed.
The specific pipe arrangement diselosed herein includes a heat insulated pipe which itself includes an end section having an outer cylindrical core or casing, an intermediate cylindrical layer of insulation and an inner cylindrical core including an end portion which extends axially beyond adjacent ends of the outer core and insulation layer~ The end section also includes an end seal located around a segment of the inner core end portion and in engagement
METHOD OF ASSEMBLING COMPONENTS
OF THIS ARRANGEMENT
Background of the Invention The present invention relates generally to a pipe arrangement and more particularly to a speciFic heat insulated pipe arrangement and method of assembling components of this arrangement.
Where conduit service is provided for carrying warm to hot fluids, for example, fluids reaching tempera-tures between 50F and 250F, it is sometimes necessary to use what is commonly referred to as heat insulated conduit.
A typical conduit or pipe of this type includes an inner core constructed of for example steel, an outer protective casing or core constructed of, for example, asbestos-cement and an intermediate layer of insulation material. Typically, the inner steel core includes opposite end portions which ~ ?
project axially beyond the layer of insulation and outer protective casing and also typically includes end seals -positioned against opposite ends of the insulation layer around these projecting end portions to seal the insulation between the inner core and outer casing.
Two conduits or pipes of this type are typically connected together by means of a coupling constructed of, for example, asbestos-cement. This coupling includes opposite end portions and axially spaced annular seals located concen-trically in the inner surface of the coupling and spaced from the opposite ends thereof. One end portion of this coupling is concentrically positioned around an axially projecting inner core portion of one of the conduits or pipes so that the free end of this end portion engages against the associated : ' ,' ~ .', .
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. .
~47~4 1 end seal and such that one of the annular seals engages around the projecting portion of the associated inner core.
The other end portion of the coupling is assembled to the other pipe or conduit in the same manner.
As will be seen hereinafter, the present invention is directed to a pipe arrangement generally similar to the one just described but one which has both physical and assembly advantages over the prior art.
Summary of the Invention An object of the present invention is to provide a heat insulated pipe arrangement which includes a heat insulated pipe and coupling and which includes a reliable moisture and corrosion seal between this pipe end coupling.
Another object of the present invention is to provide a seal of the last mentioned type which compensates for any expansion and contraction of the inner core of the conduit or pipe, which expansion and contraction may occur if the core is constructed of For example steel.
Still another object of the present invention is ~o provide an uncomplicated and yet reliable method of assemblying together the heat insulated conduit or pipe and coupling just discussed.
The specific pipe arrangement diselosed herein includes a heat insulated pipe which itself includes an end section having an outer cylindrical core or casing, an intermediate cylindrical layer of insulation and an inner cylindrical core including an end portion which extends axially beyond adjacent ends of the outer core and insulation layer~ The end section also includes an end seal located around a segment of the inner core end portion and in engagement
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~ 7~4 1 with the adjacent end of the insulation layer. The coupling, which is adapted to connet this insulation pipe to a second preferably identical pipe, has one end portion positioned concentrically around the inner core end portion adjacent the outer core and end seal. An annular seal is located concen-trically between the coupling and the inner core end portion and is axially spaced from the end seal For providing a moisture seal therebetween. ;
In accordance with the present invention, a cured lo room temperature vulcanizing material (RTV~, preferably silicone rubber, extends axially between circumferential segments of the coupling end portion and inner core end portion axially between the end seal and annular seal. This material also extends radially outwardly from the inner core end portion between at ~;~
least a portion of the end seal and the adjacent end of the ~ -. .
coupling. This material (1) acts as a ground water seal and where the inner core of the heat insulated pipe is metal it (2) ~-prevents corrosion of that portion of the inner core which projects beyond the outer core and layer of insulation. In addition, the material is (3) sufficiently flexible to compensate for expansion and contraction of the metal core due to changes in temperature within the pipe so as to substantially minimize if not eliminate the possibility of a break between the sealing material and the inner core.
. ~ . .
The RTV material is preferably located in the manner discussed during the assembly of the insulated pipe and coupling. Accordingly, a method is disclosed of assembing one end portion of a coupling including a radially inwardly extending ~;
concentric annular seal located around its inner suface and spaced from the free end of the end portion to a heat insulated pipe
~ 7~4 1 with the adjacent end of the insulation layer. The coupling, which is adapted to connet this insulation pipe to a second preferably identical pipe, has one end portion positioned concentrically around the inner core end portion adjacent the outer core and end seal. An annular seal is located concen-trically between the coupling and the inner core end portion and is axially spaced from the end seal For providing a moisture seal therebetween. ;
In accordance with the present invention, a cured lo room temperature vulcanizing material (RTV~, preferably silicone rubber, extends axially between circumferential segments of the coupling end portion and inner core end portion axially between the end seal and annular seal. This material also extends radially outwardly from the inner core end portion between at ~;~
least a portion of the end seal and the adjacent end of the ~ -. .
coupling. This material (1) acts as a ground water seal and where the inner core of the heat insulated pipe is metal it (2) ~-prevents corrosion of that portion of the inner core which projects beyond the outer core and layer of insulation. In addition, the material is (3) sufficiently flexible to compensate for expansion and contraction of the metal core due to changes in temperature within the pipe so as to substantially minimize if not eliminate the possibility of a break between the sealing material and the inner core.
. ~ . .
The RTV material is preferably located in the manner discussed during the assembly of the insulated pipe and coupling. Accordingly, a method is disclosed of assembing one end portion of a coupling including a radially inwardly extending ~;
concentric annular seal located around its inner suface and spaced from the free end of the end portion to a heat insulated pipe
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1 including an end section having an outer cylindrical layer, an intermediate cylindrical layer of insulatlon, an inner cylindrical layer, including an end portion extending axailly beyond adjacent ends of said outer core and insulation layer, and an end seal located around a segment of said inner core end portion and in engagement with said adjacent end of said insulation layer. This method comprises (a) coating an outer circumferential suface segment of said inner core end portion with an uncured room temperature vulcanizing material, (b) by relative movement between said pipe and coupling, moving the free end of said coupling end portion concentrically over said coated inner core end portion until said free end is adjacent said end seal, said movement taking place while said vulcanizing material is still in an uncured state, (c) causing a large portion of said uncured vulcanizing material to move with said movement so as to ultimately extend axially between circumferential egments of said coupling end portion and inner core end portion axially between said end seal and annular seal and so as to ultimately extend radially outwardly from said inner core end portion between at least portions of said end seal and said free end of said coupling; and (d) thereafter allowing said vulcanizing material to cure.
This method not only rapidly and reliably locates the ~TV material in the desired position but also acts as a lubricant to aid in fitting the insulated pipe and coupling together.
Brief Description of the Drawing FIG. 1 is a diametral cross-sectional view of an overall pipe arrangement constructed in accordance with the present invention.
FIG. 2 is a perspective view of two unassembled com-ponents of the arrangement of FIG. 1.
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1 Detailed Description and Preferred Embodiments Turning to the drawing, attention is directed specifically to FIG. 1 which illustrates a pipe arrangement contructed in accordance with the present invention and generally designated by the reference numeral 10. This arrangement is comprised of two hsat insulated conduits or pipes 12 and 12a which are coaxially positioned adjacent one another and which are connected together by means of a ~ :
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1 coupling 14. Arrangement 10 is adapted to carry warm to hot fluids under pressure, typically hot water reaching temperatures of at most approximately 250F and pressures of approximately 150 psi. In this regard, a minimum pressure of 25 psig is required to prevent steam flashing at temperatures above 212F. Typical uses for this type of arrangement would include central heating and cooling systems for hospitals, schools, and the like.
Conduit or pipe 12 includes an innermost ~luid carrying pipe or core 16 which is preferably constructed of carbon steel or other suitable material and an outermost protective core or tubular casing 18 which may be constructed of any suitable material but which is preferably constructed of plastic, specifically polyvinyl chloride. The innermost core and outermost core or casing are spaced frcm one another as illustrated in FI~. 1 and a concentric tubular layer of insulation 20, for example polyurethane foam, is located therebetween. As illustrated in FIG. 1, innermost core 16 includes a tubular end section 22 which extends beyond the adjacent ends 24 and 26 of outer casing 18 and insulation layer 20, respectively. The outer surface of this protruding end section, if not inherently corrosion resistant, is preferably made corrosion resistant by suitable treatment, ~
for example, by coating the outer surface with a zinc compound ~ -or other suitable compound.
In addition to inner core 16, outer casing 18 and insulation layer 20, the insulated conduit or pipe 12 includes an annular end seal 28, preferably constructed of relatively hard rubber, lncated around a segment of the protruding end section 22 and in engagement with the adjacent end of insulation - ~
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1 layer 20. This end seal and one on the other end of the insulation layer 2Q act as moisture barriers around the ends of insulation layer. In this regard, FIG. 1 illustrates only one overall end section of conduit 12. The opposite end of this conduit is preferably identical to the end section described. In addition, conduit 12a is preferably identical to conduit 12. Hence, like components of the two conduits are designated by like reference numerals with the suffix letter "a" distinguishing those components making up conduit 12a from those making up conduit 12.
As stated previously, conduits 12 and 12a are connected together by means of coupling 14. This coupling.
which may be constructed of any suitable material, for example, asbestos cement or other materials suitable for ; ;~
250F service, but which is preferably constructed o~ asbestos~
cement, is illustrated in FIG. l as a straight cylindrical section. This of course would be the case where conduits 12 :-and 12a are to be connected in straight-line fashion.
However, it is to be understood that where conduit 12a is to extend in a transverse fashion relative to conduit 12, coupling 14 could be so shaped to provide this curve. In other words, while component 14 will be designated as a coupling it is intended ~or this term to include various shaped fittings generally.
Coupling 14 includes opposite end sections 30 and 30a, each of which includes a respective free end designated at 32 and 32a. End section 30 includes a concentric inner-circumferential groove 34 extending radially outwardly from the section's inner sur~ace and spaced from free end 32. In a similar manner, end section 30a includes a concentric '' .: ': ': " .
~7~;4 1 inner-circumferential groove 34a extending radially outwardly from the sections inner surface and spaced from end 32a.
Annular sealing gaskets 3~ and 36a are disposed within grooves 34 and 34a respectively and extend radially inwardly a slight distance beyond the inner surface of coupling 14.
These annular sealing gaskets may be constructed of any suitable heat resistant elastomeric material, and, as will be seen, prov~de a moisture seal between coupling 14 and end ~
sections 22 and 22a of conduits 12 and 12a. ~ -As illustrated in FIG. 1, end section 30 of coupling 14 is positioned concentrically around the axially proiecting inner core section 22 such that coupling end 32 is located adiacent to and confronts end seal 28 and end 24 of outer casing 18. Coupling section 30a is positioned around axially projecting inner core section 22a in the same manner, i.e., with end 32a adjacent to and confronting end seal 28a and - outer casing end 24a. In this regard, it should be noted ~ ~ -that the free ends of axially projecting sections 22 and 22a of respective conduits 12 and 12a are positioned in confronting but spaced apart relationship. This spacing, generall~ ` ;
designated at 38, not only compensates for tolerance variations in the conduits and coupling but also allows for expansion of innermost cores 22 and 22a. Note also that sealing gaskets 36 and 36a in their final position engage tightly around the outer surfaces of axially projecting sections 22 ~-and 22a and are spaced axially away from perspective end seals 28 and 28a.
In accordance with the present invention, a cured room temperature vulcanizing material (RTV) generally designated at 40 comprises a part of the overall arrangement 10. As , :, ' , :
' ~0~7~36~L ~
1 illustrated in FIG. 1, this material extends axially between circumferential segments of inner core end section 22 and coupling end portion 30, axially between end seal 28 and annular seal 36. This material also extends radially ;~
outwardly from end section 22, all the way around this section, between at least portions of end seal 28 and end 32 ~;
of coupling 14. As illustrated, the material preferably ~ -extends entirely out to outer casing 18. While not illustrated, a surface residue of the RTV materials may be located around the circumferential segment of section 22 located on the other side of annular sealing gasket 36, i.e., to the right of the gasket as viewed in FIG. 1. This is primarily due to the method in which pipe arrangement lO is assembled, as will be seen hereinafter with respect to FIG. 2.
Roon temperature vulcanizing material is also located between innermost core section 22a and seal 28a and ~: .
coupling end section 30a in the same manner as just discussed ~ -and is generally designated at 40a.
Any particular RTV material is suitable such as silicone rubber or other heat resistant rubber. The use of this material has several advantages. It acts as a ground -water seal when secured bet~een the coupling and conduit.
- Accordingly it prevents moisture from reaching the otherwise exposed surface of the axially projecting lnner core section to prevent corrosion thereof. In addition, because of its flexible nature, once the RTV material adheres to innermost core 22, it maintains its seal ~ith the innermost core regardless of expansion and contraction of the latter. In ~ ~;
other words, there is sufficient give to the RTV material so as to flex with the expansion and contraction of the steel .
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core and hence not break the seal therebetween. Further, as will be discussed with respect to FIG. 2, the RTV material aids in the assembly of the conduits 12 and 12a with coupling Turning to FIG. 2, conduit 12 and coupling 14 are -~
illustrated in unassembled fashion. In assembling together these two components the RTV material, for example the silicone rubber, in its uncured state, i5 initially coated around an entire circumferential outer surface segment of end section 22. The exact length of the section 22 to be coated depends upon the amount of RlV material desired and the thickness of the coating. As illustrated in FIG. 2, all but a small end portion of section 22 is coated. ~lowever, the entire end section could be coated. Once the coating of RTV material is applied to end section 22, by relative movement end 32 of coupling 14 is moved over section 22 towards end seal 28 until coupli~ng end section 30 and conduit 12 are positioned in the manner illustrated in FIG. 1.
During this relative movement, the inner surface of coupling `~
end section 30, particularly the inner surface located forwardly of sealing gasket 36 and the sealing gasket itself cause the coating of still uncured RrV material to move - towards end seal 28 and radially up between the end seal and end 32 of the coupling. Hence, most of the coating material is ultimately located in the position illustrated in FIG~
This method of assembly not only aids in ultimately positioning ~ -the RTV material but is of a substant~al aid as a lubricant ~ ~
in assembling coupling 14 to the conduit. After assembly, ; ~;
the RTV material is allowed to cure. This same procedure would also be followed in assembling together conduit 12a _ g . .
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and end section 30a of coupling 14~
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1 including an end section having an outer cylindrical layer, an intermediate cylindrical layer of insulatlon, an inner cylindrical layer, including an end portion extending axailly beyond adjacent ends of said outer core and insulation layer, and an end seal located around a segment of said inner core end portion and in engagement with said adjacent end of said insulation layer. This method comprises (a) coating an outer circumferential suface segment of said inner core end portion with an uncured room temperature vulcanizing material, (b) by relative movement between said pipe and coupling, moving the free end of said coupling end portion concentrically over said coated inner core end portion until said free end is adjacent said end seal, said movement taking place while said vulcanizing material is still in an uncured state, (c) causing a large portion of said uncured vulcanizing material to move with said movement so as to ultimately extend axially between circumferential egments of said coupling end portion and inner core end portion axially between said end seal and annular seal and so as to ultimately extend radially outwardly from said inner core end portion between at least portions of said end seal and said free end of said coupling; and (d) thereafter allowing said vulcanizing material to cure.
This method not only rapidly and reliably locates the ~TV material in the desired position but also acts as a lubricant to aid in fitting the insulated pipe and coupling together.
Brief Description of the Drawing FIG. 1 is a diametral cross-sectional view of an overall pipe arrangement constructed in accordance with the present invention.
FIG. 2 is a perspective view of two unassembled com-ponents of the arrangement of FIG. 1.
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1 Detailed Description and Preferred Embodiments Turning to the drawing, attention is directed specifically to FIG. 1 which illustrates a pipe arrangement contructed in accordance with the present invention and generally designated by the reference numeral 10. This arrangement is comprised of two hsat insulated conduits or pipes 12 and 12a which are coaxially positioned adjacent one another and which are connected together by means of a ~ :
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1 coupling 14. Arrangement 10 is adapted to carry warm to hot fluids under pressure, typically hot water reaching temperatures of at most approximately 250F and pressures of approximately 150 psi. In this regard, a minimum pressure of 25 psig is required to prevent steam flashing at temperatures above 212F. Typical uses for this type of arrangement would include central heating and cooling systems for hospitals, schools, and the like.
Conduit or pipe 12 includes an innermost ~luid carrying pipe or core 16 which is preferably constructed of carbon steel or other suitable material and an outermost protective core or tubular casing 18 which may be constructed of any suitable material but which is preferably constructed of plastic, specifically polyvinyl chloride. The innermost core and outermost core or casing are spaced frcm one another as illustrated in FI~. 1 and a concentric tubular layer of insulation 20, for example polyurethane foam, is located therebetween. As illustrated in FIG. 1, innermost core 16 includes a tubular end section 22 which extends beyond the adjacent ends 24 and 26 of outer casing 18 and insulation layer 20, respectively. The outer surface of this protruding end section, if not inherently corrosion resistant, is preferably made corrosion resistant by suitable treatment, ~
for example, by coating the outer surface with a zinc compound ~ -or other suitable compound.
In addition to inner core 16, outer casing 18 and insulation layer 20, the insulated conduit or pipe 12 includes an annular end seal 28, preferably constructed of relatively hard rubber, lncated around a segment of the protruding end section 22 and in engagement with the adjacent end of insulation - ~
~ a7 0~i~
1 layer 20. This end seal and one on the other end of the insulation layer 2Q act as moisture barriers around the ends of insulation layer. In this regard, FIG. 1 illustrates only one overall end section of conduit 12. The opposite end of this conduit is preferably identical to the end section described. In addition, conduit 12a is preferably identical to conduit 12. Hence, like components of the two conduits are designated by like reference numerals with the suffix letter "a" distinguishing those components making up conduit 12a from those making up conduit 12.
As stated previously, conduits 12 and 12a are connected together by means of coupling 14. This coupling.
which may be constructed of any suitable material, for example, asbestos cement or other materials suitable for ; ;~
250F service, but which is preferably constructed o~ asbestos~
cement, is illustrated in FIG. l as a straight cylindrical section. This of course would be the case where conduits 12 :-and 12a are to be connected in straight-line fashion.
However, it is to be understood that where conduit 12a is to extend in a transverse fashion relative to conduit 12, coupling 14 could be so shaped to provide this curve. In other words, while component 14 will be designated as a coupling it is intended ~or this term to include various shaped fittings generally.
Coupling 14 includes opposite end sections 30 and 30a, each of which includes a respective free end designated at 32 and 32a. End section 30 includes a concentric inner-circumferential groove 34 extending radially outwardly from the section's inner sur~ace and spaced from free end 32. In a similar manner, end section 30a includes a concentric '' .: ': ': " .
~7~;4 1 inner-circumferential groove 34a extending radially outwardly from the sections inner surface and spaced from end 32a.
Annular sealing gaskets 3~ and 36a are disposed within grooves 34 and 34a respectively and extend radially inwardly a slight distance beyond the inner surface of coupling 14.
These annular sealing gaskets may be constructed of any suitable heat resistant elastomeric material, and, as will be seen, prov~de a moisture seal between coupling 14 and end ~
sections 22 and 22a of conduits 12 and 12a. ~ -As illustrated in FIG. 1, end section 30 of coupling 14 is positioned concentrically around the axially proiecting inner core section 22 such that coupling end 32 is located adiacent to and confronts end seal 28 and end 24 of outer casing 18. Coupling section 30a is positioned around axially projecting inner core section 22a in the same manner, i.e., with end 32a adjacent to and confronting end seal 28a and - outer casing end 24a. In this regard, it should be noted ~ ~ -that the free ends of axially projecting sections 22 and 22a of respective conduits 12 and 12a are positioned in confronting but spaced apart relationship. This spacing, generall~ ` ;
designated at 38, not only compensates for tolerance variations in the conduits and coupling but also allows for expansion of innermost cores 22 and 22a. Note also that sealing gaskets 36 and 36a in their final position engage tightly around the outer surfaces of axially projecting sections 22 ~-and 22a and are spaced axially away from perspective end seals 28 and 28a.
In accordance with the present invention, a cured room temperature vulcanizing material (RTV) generally designated at 40 comprises a part of the overall arrangement 10. As , :, ' , :
' ~0~7~36~L ~
1 illustrated in FIG. 1, this material extends axially between circumferential segments of inner core end section 22 and coupling end portion 30, axially between end seal 28 and annular seal 36. This material also extends radially ;~
outwardly from end section 22, all the way around this section, between at least portions of end seal 28 and end 32 ~;
of coupling 14. As illustrated, the material preferably ~ -extends entirely out to outer casing 18. While not illustrated, a surface residue of the RTV materials may be located around the circumferential segment of section 22 located on the other side of annular sealing gasket 36, i.e., to the right of the gasket as viewed in FIG. 1. This is primarily due to the method in which pipe arrangement lO is assembled, as will be seen hereinafter with respect to FIG. 2.
Roon temperature vulcanizing material is also located between innermost core section 22a and seal 28a and ~: .
coupling end section 30a in the same manner as just discussed ~ -and is generally designated at 40a.
Any particular RTV material is suitable such as silicone rubber or other heat resistant rubber. The use of this material has several advantages. It acts as a ground -water seal when secured bet~een the coupling and conduit.
- Accordingly it prevents moisture from reaching the otherwise exposed surface of the axially projecting lnner core section to prevent corrosion thereof. In addition, because of its flexible nature, once the RTV material adheres to innermost core 22, it maintains its seal ~ith the innermost core regardless of expansion and contraction of the latter. In ~ ~;
other words, there is sufficient give to the RTV material so as to flex with the expansion and contraction of the steel .
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core and hence not break the seal therebetween. Further, as will be discussed with respect to FIG. 2, the RTV material aids in the assembly of the conduits 12 and 12a with coupling Turning to FIG. 2, conduit 12 and coupling 14 are -~
illustrated in unassembled fashion. In assembling together these two components the RTV material, for example the silicone rubber, in its uncured state, i5 initially coated around an entire circumferential outer surface segment of end section 22. The exact length of the section 22 to be coated depends upon the amount of RlV material desired and the thickness of the coating. As illustrated in FIG. 2, all but a small end portion of section 22 is coated. ~lowever, the entire end section could be coated. Once the coating of RTV material is applied to end section 22, by relative movement end 32 of coupling 14 is moved over section 22 towards end seal 28 until coupli~ng end section 30 and conduit 12 are positioned in the manner illustrated in FIG. 1.
During this relative movement, the inner surface of coupling `~
end section 30, particularly the inner surface located forwardly of sealing gasket 36 and the sealing gasket itself cause the coating of still uncured RrV material to move - towards end seal 28 and radially up between the end seal and end 32 of the coupling. Hence, most of the coating material is ultimately located in the position illustrated in FIG~
This method of assembly not only aids in ultimately positioning ~ -the RTV material but is of a substant~al aid as a lubricant ~ ~
in assembling coupling 14 to the conduit. After assembly, ; ~;
the RTV material is allowed to cure. This same procedure would also be followed in assembling together conduit 12a _ g . .
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and end section 30a of coupling 14~
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Claims (9)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A pipe arrangement comprising:
(a) a heat insulated pipe including an end section having (i) an outer cylindrical core, (ii) an intermediate cylindrical layer of insulation, (iii) an inner cylindrical core including an end portion extending axially beyond adjacent ends of said outer core and insulation layer, and (iv) an end seal located around a segment of said inner core end portion and in engagement with said adjacent end of said insulation layer:
(b) a coupling adapted to connect said insulated pipe to a second pipe, said coupling having one end portion positioned concentrically around said inner core end portion adjacent said adjacent ends of said outer core and said end seal, said coupling including an annular seal located concentrically between said coupling portion and said inner core portion and axially spaced from said end seal for providing a moisture seal therebetween; and (c) a cured room temperature vulcanizing material extending axially between circumferential segments of said coupling end portion and inner core end portion axially between said end seal and annular seal and extending radially outwardly from said inner core end portion between at least portions of said end seal and the adjacent end of said coupling.
(a) a heat insulated pipe including an end section having (i) an outer cylindrical core, (ii) an intermediate cylindrical layer of insulation, (iii) an inner cylindrical core including an end portion extending axially beyond adjacent ends of said outer core and insulation layer, and (iv) an end seal located around a segment of said inner core end portion and in engagement with said adjacent end of said insulation layer:
(b) a coupling adapted to connect said insulated pipe to a second pipe, said coupling having one end portion positioned concentrically around said inner core end portion adjacent said adjacent ends of said outer core and said end seal, said coupling including an annular seal located concentrically between said coupling portion and said inner core portion and axially spaced from said end seal for providing a moisture seal therebetween; and (c) a cured room temperature vulcanizing material extending axially between circumferential segments of said coupling end portion and inner core end portion axially between said end seal and annular seal and extending radially outwardly from said inner core end portion between at least portions of said end seal and the adjacent end of said coupling.
2. A pipe arrangement according to Claim 1 wherein said vulcanizing material is heat resistant rubber.
3. A pipe arrangement according to Claim 1 wherein said inner core is metal.
4. A pipe arrangement according to Claim 3 wherein said outer core is a thermo plastic material.
5. A pipe arrangement comprising:
(a) two heat insulated pipes, each of which includes an end section having (i) a plastic outer cylindrical core, (ii) an intermediate cylindrical layer of insulation, (iii) a metal inner cylindrical core including an end portion extending axially beyond adjacent ends of said outer core and insulation layer, and (iv) an end seal located around a segment of said inner core end portion and in engagement with said adjacent end of said insulation layer;
(b) said heat insulated pipes being positioned in axial alignment with one another so that the free ends of said inner core portions are in close proximity to but spaced from one another;
(c) a coupling for connecting said insulated pipes together, said coupling including (i) one end portion positioned concentrically around one of said inner core end portions and an annular seal located concentrically between said coupling end portion and said inner core portion and axially spaced from the end seal associated with said one inner core end portion, and (ii) an opposite end portion positioned concentrically around the other inner core end portion and a second annular seal located concentrically between said opposite coupling end portion and said other inner core end portion and axially spaced from the end seal associated with said other inner core end portion;
(d) a cured room temperature vulcanizing material extending axially between annular segments of said one coupling end portion and associated inner core end portion axially between the associated end seal and associated annular seal, said vulcanizing material extending radially outward from said one inner core end portion between at least portions of said associated end seal and the adjacent end of said coupling; and (e) a cured room temperature vulcanizing material extending axially between annular segments of said opposite coupling end portion and associated inner core end portion axially between the associated end seal and associated annular seal, said last-mentioned material extending radially outward from said other inner core end portion between at least portions of associated end seal and the adjacent end of said coupling.
(a) two heat insulated pipes, each of which includes an end section having (i) a plastic outer cylindrical core, (ii) an intermediate cylindrical layer of insulation, (iii) a metal inner cylindrical core including an end portion extending axially beyond adjacent ends of said outer core and insulation layer, and (iv) an end seal located around a segment of said inner core end portion and in engagement with said adjacent end of said insulation layer;
(b) said heat insulated pipes being positioned in axial alignment with one another so that the free ends of said inner core portions are in close proximity to but spaced from one another;
(c) a coupling for connecting said insulated pipes together, said coupling including (i) one end portion positioned concentrically around one of said inner core end portions and an annular seal located concentrically between said coupling end portion and said inner core portion and axially spaced from the end seal associated with said one inner core end portion, and (ii) an opposite end portion positioned concentrically around the other inner core end portion and a second annular seal located concentrically between said opposite coupling end portion and said other inner core end portion and axially spaced from the end seal associated with said other inner core end portion;
(d) a cured room temperature vulcanizing material extending axially between annular segments of said one coupling end portion and associated inner core end portion axially between the associated end seal and associated annular seal, said vulcanizing material extending radially outward from said one inner core end portion between at least portions of said associated end seal and the adjacent end of said coupling; and (e) a cured room temperature vulcanizing material extending axially between annular segments of said opposite coupling end portion and associated inner core end portion axially between the associated end seal and associated annular seal, said last-mentioned material extending radially outward from said other inner core end portion between at least portions of associated end seal and the adjacent end of said coupling.
6. A pipe arrangement according to Claim 5 wherein said vulcanizing material is silicone rubber.
7. A method of assembling one end portion of a coupling including a radially inwardly extending concentric annular seal located around its inner surface and spaced from the free end of the end portion to a heat insulated pipe including an end section having an outer cylindrical layer, an intermediate cylindrical layer of insulation, an inner cylindrical layer including an end portion extending axially beyond adjacent ends of said outer core and insulation layer, and an end seal located around a segment of said inner core end portion and in engagement with said adjacent end of said insulation layer, said method comprising:
(a) coating an outer circumferential surface segment of said inner core end portion with an uncured room temperature vulcanizing material;
(b) by relative movement between said pipe and coupling, moving the free end of said coupling end portion concentrically over said coated inner core end portion until said free end is adjacent said end seal, said movement taking place while said vulcanizing material is still in an uncured state;
(c) causing a large portion of said uncured vulcanizing material to move with said movement so as to ultimately extend axially between circumferential segments of said coupling end portion and inner core end portion axially between said end seal and annular seal and so as to ultimately extend radially outwardly from said inner core end portion between at least portions of said end seal and said free end of said coupling; and (d) thereafter allowing said vulcanizing material to cure.
(a) coating an outer circumferential surface segment of said inner core end portion with an uncured room temperature vulcanizing material;
(b) by relative movement between said pipe and coupling, moving the free end of said coupling end portion concentrically over said coated inner core end portion until said free end is adjacent said end seal, said movement taking place while said vulcanizing material is still in an uncured state;
(c) causing a large portion of said uncured vulcanizing material to move with said movement so as to ultimately extend axially between circumferential segments of said coupling end portion and inner core end portion axially between said end seal and annular seal and so as to ultimately extend radially outwardly from said inner core end portion between at least portions of said end seal and said free end of said coupling; and (d) thereafter allowing said vulcanizing material to cure.
8. A method according to Claim 7 wherein said vulcanizing material is heat resistant rubber.
9. A method according to Claim 8 wherein said heat resistant rubber is silicone rubber.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US58792775A | 1975-06-18 | 1975-06-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1047064A true CA1047064A (en) | 1979-01-23 |
Family
ID=24351750
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA254,874A Expired CA1047064A (en) | 1975-06-18 | 1976-06-15 | Heat insulated pipe arrangement and method of assembling components of this arrangement |
Country Status (12)
| Country | Link |
|---|---|
| JP (1) | JPS5234424A (en) |
| AU (1) | AU497789B2 (en) |
| BE (1) | BE843145A (en) |
| BR (1) | BR7603957A (en) |
| CA (1) | CA1047064A (en) |
| DE (2) | DE7619362U1 (en) |
| DK (1) | DK269076A (en) |
| FR (1) | FR2316523A1 (en) |
| GB (1) | GB1509868A (en) |
| IT (1) | IT1061595B (en) |
| NO (1) | NO762101L (en) |
| SE (1) | SE429059B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6042410U (en) * | 1983-09-02 | 1985-03-26 | 株式会社 アマダ | Front table in press machine |
| JPS6081383U (en) * | 1983-11-11 | 1985-06-05 | 三菱樹脂株式会社 | Fireproof pipe connection device |
| JPH0193286U (en) * | 1987-12-09 | 1989-06-19 | ||
| JPH01181919A (en) * | 1988-01-12 | 1989-07-19 | Shinwa Giken:Kk | Following and supporting device of work for bending operation |
| JPH01197013A (en) * | 1988-01-29 | 1989-08-08 | Shinwa Giken:Kk | Holding device to follow work for thrust bending |
| JPH0728464Y2 (en) * | 1990-06-21 | 1995-06-28 | 株式会社クボタ | Tube for propulsion method |
| AT518117B1 (en) | 2015-12-28 | 2017-12-15 | Hawle Water Tech Norge As | connection device |
-
1976
- 1976-06-15 CA CA254,874A patent/CA1047064A/en not_active Expired
- 1976-06-16 DK DK269076A patent/DK269076A/en unknown
- 1976-06-17 AU AU15012/76A patent/AU497789B2/en not_active Expired
- 1976-06-17 SE SE7606914A patent/SE429059B/en not_active IP Right Cessation
- 1976-06-17 FR FR7618488A patent/FR2316523A1/en active Granted
- 1976-06-17 NO NO762101A patent/NO762101L/no unknown
- 1976-06-18 GB GB25270/76A patent/GB1509868A/en not_active Expired
- 1976-06-18 DE DE19767619362U patent/DE7619362U1/en not_active Expired
- 1976-06-18 JP JP51071303A patent/JPS5234424A/en active Pending
- 1976-06-18 BR BR7603957A patent/BR7603957A/en unknown
- 1976-06-18 DE DE19762627378 patent/DE2627378A1/en not_active Withdrawn
- 1976-06-18 BE BE168092A patent/BE843145A/en unknown
- 1976-06-18 IT IT50021/76A patent/IT1061595B/en active
Also Published As
| Publication number | Publication date |
|---|---|
| IT1061595B (en) | 1983-04-30 |
| DE2627378A1 (en) | 1976-12-23 |
| JPS5234424A (en) | 1977-03-16 |
| AU1501276A (en) | 1977-12-22 |
| BE843145A (en) | 1976-12-20 |
| BR7603957A (en) | 1977-03-22 |
| DE7619362U1 (en) | 1979-06-07 |
| AU497789B2 (en) | 1979-01-11 |
| SE429059B (en) | 1983-08-08 |
| FR2316523B1 (en) | 1980-05-30 |
| GB1509868A (en) | 1978-05-04 |
| DK269076A (en) | 1976-12-19 |
| SE7606914L (en) | 1976-12-19 |
| FR2316523A1 (en) | 1977-01-28 |
| NO762101L (en) | 1976-12-21 |
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