CA1090691A - Pipe protector - Google Patents
Pipe protectorInfo
- Publication number
- CA1090691A CA1090691A CA249,984A CA249984A CA1090691A CA 1090691 A CA1090691 A CA 1090691A CA 249984 A CA249984 A CA 249984A CA 1090691 A CA1090691 A CA 1090691A
- Authority
- CA
- Canada
- Prior art keywords
- ribs
- pipe
- apertures
- structure according
- cms
- 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
- F16L57/00—Protection of pipes or objects of similar shape against external or internal damage or wear
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Protection Of Pipes Against Damage, Friction, And Corrosion (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
- Orthopedics, Nursing, And Contraception (AREA)
- Laying Of Electric Cables Or Lines Outside (AREA)
- Laminated Bodies (AREA)
Abstract
A B S T R A C T
A wrapping structure for protecting pipes has a plurality of ribs and a plurality of apertures and is flexible.
The apertures allow a cathodic protection system to operate.
On the side to be applied to a pipe the surfaces of the ribs lie in a single plane so that when drawn tight there are no projections to cut into wrappings or coatings on the pipe.
The structure is preferably of a resilient polymeric material, preferably air entrained polyethylene.
A wrapping structure for protecting pipes has a plurality of ribs and a plurality of apertures and is flexible.
The apertures allow a cathodic protection system to operate.
On the side to be applied to a pipe the surfaces of the ribs lie in a single plane so that when drawn tight there are no projections to cut into wrappings or coatings on the pipe.
The structure is preferably of a resilient polymeric material, preferably air entrained polyethylene.
Description
1090~gl Th~s invention relates to a wrappinq ~tructure fo~
.~protectin~ pipe~, p~ticularly steel pipelines ~hicb may ~e '' -~ub~ected to impaat by hard ob~ects,.for example rocko and ~ -pe~bles. :
~t i~ well ~nown.that Jteel pipel$ne~, whether-buri d ~n the ground, or restinq on the ~urfac- of th ~ea-bed, c~n . ~ be protectea with coating~-compos$t~ons or wrappinqJ. In or~e*
.
' . .to prevent localiaed corro~ion occurring at.holas or tearJ $n ~ the~a protective coatinga or wrappings, cathodic protection I0~ often employed a~ a ~econd line of defence. This cathod$c -.- protect~on.involve~ placing'adiacent to the pipe an anodè of ' a.metal which is bigher than iron in the electroohemical Jer1e~, .. ... . . . .
';~'' or~the impre~ioniof.electrical current. The cathodic : -. -.... -- ''''-'~protact~on io normally only réquired when the protective '~ 15 coatin~ or wrapping become~ d~maged, althouqh, of couroe..with ..~ ..a buriod or Jubmarine piEeline one ~cannot know whether thlJ
.. . . . .
. ~' ha~b-p;-nel. ~ . ' - ~.
.'~ - When a pipeline-pro~tected by a coating or'wrapping laid in rooky terrain or a ~b- oil conta~n~ng sharp and-abrasive aggregates, it i8 aes1rable to protect the protective .. soating or wrapplng against damage by abrasion or impact withsuch roc~ or aharp aggregate by means of a barrier sufficiently -robust to protect the coatin~ or wrapping againqt damage by m~ such i~pact or ~bra d on. TS~J i~ clearly des~rable even thoug~
- 25 a cathodic protection may also be.provided, because qu~te . . ~e w re damage may otherwise occur in the pipe laylng operat~on.
at the same time, the barrler must permit a system of cathodic .
.~protectin~ pipe~, p~ticularly steel pipelines ~hicb may ~e '' -~ub~ected to impaat by hard ob~ects,.for example rocko and ~ -pe~bles. :
~t i~ well ~nown.that Jteel pipel$ne~, whether-buri d ~n the ground, or restinq on the ~urfac- of th ~ea-bed, c~n . ~ be protectea with coating~-compos$t~ons or wrappinqJ. In or~e*
.
' . .to prevent localiaed corro~ion occurring at.holas or tearJ $n ~ the~a protective coatinga or wrappings, cathodic protection I0~ often employed a~ a ~econd line of defence. This cathod$c -.- protect~on.involve~ placing'adiacent to the pipe an anodè of ' a.metal which is bigher than iron in the electroohemical Jer1e~, .. ... . . . .
';~'' or~the impre~ioniof.electrical current. The cathodic : -. -.... -- ''''-'~protact~on io normally only réquired when the protective '~ 15 coatin~ or wrapping become~ d~maged, althouqh, of couroe..with ..~ ..a buriod or Jubmarine piEeline one ~cannot know whether thlJ
.. . . . .
. ~' ha~b-p;-nel. ~ . ' - ~.
.'~ - When a pipeline-pro~tected by a coating or'wrapping laid in rooky terrain or a ~b- oil conta~n~ng sharp and-abrasive aggregates, it i8 aes1rable to protect the protective .. soating or wrapplng against damage by abrasion or impact withsuch roc~ or aharp aggregate by means of a barrier sufficiently -robust to protect the coatin~ or wrapping againqt damage by m~ such i~pact or ~bra d on. TS~J i~ clearly des~rable even thoug~
- 25 a cathodic protection may also be.provided, because qu~te . . ~e w re damage may otherwise occur in the pipe laylng operat~on.
at the same time, the barrler must permit a system of cathodic .
- 2 ~
. . , . ~ - .
- .. . : , .. ,., . . ~ - , / . . . ;- . `~
. .
- ... . ... . ; . . .
10~0~
protection to function by allowing the electrical current that is generated to reach any areas of metal which are exposed as a result of localised damage to the protective coating or wrapping which may, despite the barrier, have occurred.
It is an aim of the invention to provide a wrapping structure which may be used to provide such a barrier.
According to the present invention, there is provided a wrapping structure for protecting a pipe to be laid below the ground or sea against damage by abrasion or impact while allowing a cathodic protection system for the pipe to function, the structure having a plurality of ribs and a plurality of apertures between the ribs, the ribs having a height of at least 0.2 cm perpendicular to the plane of the structure, the apertures each having an area of up to 6.5 cm2 and together occupying from 40% to 90%
of the area of the structure, and the structure being of flexibie plastics material and being elongate so as to be wrappable helically, or while extend-ing longitudinally, around the pipe with the surfaces of the ribs which are the parts of the structure in contact with the pipe being rounded and lying in a generally cylindrical surface and the structure, when so wrapped, offering an exterior discontinuous surface which is free of projections.
The wrapping structure is preferably made of a polymer. At least the following polymers can be used: polyethylene, polypropylene, poly-vinylidene chloride, polyvinylchloride, polychloroprene and synthetic and natural rubbers can also be used.
It is particularly preferred for the wrapping structure to be of a polymeric resilient material. A particular example of such a material which is suitable is air entrained polyethylene.
The purpose of this preferred feature is to provide for the wrapping structure to be better able to absorb the impact of rocks or other ; - 3 --: : .
lOS~O~l articles falling on the pipe, either when situated for use, or prior to being located in the desired position, with the minimum displacement or damage to the normally provided pipe wrap or the protective coating.
The ribs are rounded on one side of the structure. The ribs can be provided to project on one side of the structure, the structure then includ-ing a web in which the apertures are formed and which connects the ribs, the ribs preferably being parallel to each other. Alternative embodiments include two sets of parallel ribs, the ribs of the sets being inclined, preferably at right angles to each other. In this case the web is not essential and all ribs are rounded on the one side of the structure, the other side being generally planar. The centre lines of the ribs preferably lie in a single plane when the structure is laid flat, so that the rounded surfaces thereof will also lie in a single plane, with the result that when the structure is pulled tight on a pipe there are no projections to cut into the previously applied wrappings thereon.
The structure is to be wrapped around a pipe, to protect the normally provided coatings and wrappings, the rounded sides of the ribs facing inwardly so that only a small proportion of the structure is in physical contact with the pipe, or, more particularly, the exterior coating thereon, thus using the minimum contact area. This means that the exterior surface of the barrier is spaced from the pipe, so that sharp aggregate will in general be kept well clear of the pipe even if it can penetrate the apertures to some extent. The apertures will be quite small, up to 1 square inch (6.5 cms2) in area and preferably more than 0.4 cm2 in area, and comprise 90% to 40%, preferably about 50% of the area of the struct~re.
After pipe laying, the apertures permit the passage of the electrical current in a cathodic protection system.
The structure is preferably at least 36 inches (1 metre) wide, ' - ;' ' ' ' ~ -. :
-' . : .. ~ ~ . , ' : ' lO~
but narrower structures can be used if desired. Any length can be provided.
The ribs may be 1/8 to 1/4 inch, (0.3 to 0.6 cm) wide parallel to the general plane of the structure and preferably have a maximum depth, perpendicular to the structure of 3/8 inch ( 0.9 cms). They may be spaced apart trans-versely of their length to give a gap about equal to their width. The ribs are preferably parallel both for ease of formation and ease of application, and may be continuous.
The wrapping structure of the invention may be helically wound round a pipe, but if desired it can be wrapped round a pipe so that the ribs are parallel with the axis of the pipe; in the latter case adjacent edges of structure abut each other, and it can be kept in place by inter-lacing the adjacent edges with a cord or rope or by the use of non-metallic clips, or using self-locking straps or tapes provided, for instance, with a ratchet mechanism.
The invention also provides a pipe laid or to be laid below the ground or sea, the pipe being protected by a wrapping structure having a plurality of ribs and a plurality of apertures between the ribs, the structure being flexible and being wrapped around the pipe, with the surfaces of the ribs which are the parts of the structure in contact with the pipe lying in a generally cylindrical surface, and the apertures being exteriorly uncovered.
The present invention will now be described, by way of example, with reference to the accompanying drawings, wherein:
Figure 1 is a top-plan view of a portion of a length of a pipe wrapping structure of the present invention;
lO9V~9l FigQr~ 2 iB a crooo,-~ectional view of the structure dhown in Figure l;
, . F1gures.3A and 3B s~ow two methods of fixinq of the.
pipe wrap~ing structure shown in Figure~ 1 and 2~ ana . , Figure 4 ~how~ another form of pipe wrapping Jtructur ~, .~ according to,the in~ention.
Referring'$nltially to Figure~ 1 nd 2 -~h- pipe . . .''. '~tructure 10 comprises~an elongate web 11 with a plurality .' , -' o~ long1tud~nally extending, laterally spacea p rallel'-roun~d N : ,-,. ribs 12 on 0ne side. Intermediate the r.ibs 12, elongate "....... , . Aper*ur.es i3 are proviaed in rows in the web.: Ao ohown ln ~ : -'. ''' ~Figure'l the aperture~ 13 in ad~acent rows are s~agg-red. . ~
.::.. ,. . -. . . . . .
~ with respect to'each other. ' ' . . -' ,,,." . . ~he wrapping ~ructure, whidh may be of a polymeric . material'or other ~u~,able material, may be made.by -xtru-ion : '. or moulding. .If.de~ired the elon~ate aper~ure~'13 may be ,--: ~ ,formed by punchlnq.after the web 11 with the rib~ 12 integ~
therewith has been ~ormed.
. : -. The pipe wrapping ~tructure ~hown in Fiqures l and 2 . may be wrapF~d. helically about a pip 14'to be covere~ (F$gur 3B)-~or,may be arranged 80 that the ribs 12 extend generally '; p~ llel to the longitudinal axi~ of the pipé 14 aa in' .: Figure 3A. In either arrangement only the riba 12 cont~ct ~h ,~ur~ w e~of t~e pipe,14 with the web 11 apaced from the pi~
25," ' '~nd the area.of contact between #he wrappl~g ~tructur- lO.~nd ~ . , - . . .
-:'~' , the pipe 14 i8 kept to a n~n~ um. ~ , , ~ In th-.case o~ the ~iPe w~4pping ~tructure lO b lng . . . . ... . . .
~ : : .~ .
. . . - .
- . . - .
. .
.. - ~ . .- . . . -. .
-- .. . . .
'` ' '~ '' ' ' : ' : ' ''' ' .
'~" ' ' ' ~
1~0~91 secured with the rib-q 12 parallel to the longitudinal axi~ of ~he pipe 14 the longitudinal edge~ of .the web, or we~s in the case of two or more lengths of material being used, to iyLrrouDd the pipe, are held in butting relationship ~ lac-~
;'l~;.which pa~s through the apertures adjacent to the'butt~ng.
edge~ of the web'or we~ or by meanq of non-metallic cl~p~ which .
.'encircle the wrapping structure 10 when ~n position about . .
. ' ~ the pipe an~ clamp it to tbe pipe 14. An alternative i~ to uJe - . . . . .
'.' :.- ; ~trap_ or tapes which self-lock, e.g. by be~ng provided'with a 10'......... ratchet mechaniQm. ' ~ . ............................ .. `
.. . . .
In the embodimcnt ~b#wD in Figures 1 and 2, the'ribs are 1/4 inch (0.6 cm) wide at their maximu~ width, exten~
- the same amount upwardly fro~ the web and are spaced , ,, , :: approximately ~H ~1.25 cm) ketween centres., The apertures '15,' , 1-3~are made ao large as po~sible consistent with maint~inin~.
,,. , ~he~,desired ~trength ~n the web and yet ~mall enough~'.~ en~uro .. i . . - .
, . ;~th ~raggregate-io kept clear of the pipe aurfac-. Thi~
. . 'ensures that if cathodic prDtection has to be used t,hen .the. ,`, .. .. . .
`,', ''~ large nu~ber of aperture~ permit the paJ~age of the 2b ~ ! electrical current theretbrough. Typically the aperture~ ar- -. . :
, -,. 5/8~ ~1.6 cms~ long, 1/4~ ~.6 cm) wide and are ~eparat d - , length,'wise by'}/8" (0.3 cm). The apertur-s thu~ compriJe ust uDder half thei area of the weib.
Figure 4 shows an-alternative embodiment of wrapping . . .'~i5'' ; ' ~tructure according..to the invention comprising two ~et~ o~
arallel ribe' ext~nding at right angles to one ,ano~her.
;' - -., ~ Rectangular apertures.(41) are accordingly provided in.~he :. : . - - -1l ~ "'' '' ?
.
.. .. . .
: .
10~0~;91 structure, and it will be seen that the ribs- are rounded to one side of the structure, this being the ~ide which will be placed upon a pipe. The other side of the structure i8 substantially planar. The wrapping structure of thia- Figure i~ again attached by clips, laces or straps ~ a pipe with the rounded siaes of the ribs in contact therewith, or i~ helically ; nd on the pipe. In one embodi~ent accord~ng to Figure 4, ~the ribs have a maximum depth of about 0.4 cms, and~a w~dth ~ ~ - of 0.7, the apertures being i.2 cms long by 0.5 cms wid-.
io Although two alternative embodiments of the wrapping ~structure 10 have been descr~bea it should be undèrsbood that the wrapping structure may take many other forms. In gener~l -the wrapping structure has a small area of surface contact ~ ;~ with the pipe and at the same time provide~ a large ov-rall passage for the flow of electrical current in the event of cathodic protection having to be used.
~referably the wrapping structure will be of the order of 36 lnche~ (approximotely 90 cms) wide. Any length o structure can be provided. -. . . ~
:.
.. .. . ..
.
.
., .
-: ' ' - - .
. . , . ~ - .
- .. . : , .. ,., . . ~ - , / . . . ;- . `~
. .
- ... . ... . ; . . .
10~0~
protection to function by allowing the electrical current that is generated to reach any areas of metal which are exposed as a result of localised damage to the protective coating or wrapping which may, despite the barrier, have occurred.
It is an aim of the invention to provide a wrapping structure which may be used to provide such a barrier.
According to the present invention, there is provided a wrapping structure for protecting a pipe to be laid below the ground or sea against damage by abrasion or impact while allowing a cathodic protection system for the pipe to function, the structure having a plurality of ribs and a plurality of apertures between the ribs, the ribs having a height of at least 0.2 cm perpendicular to the plane of the structure, the apertures each having an area of up to 6.5 cm2 and together occupying from 40% to 90%
of the area of the structure, and the structure being of flexibie plastics material and being elongate so as to be wrappable helically, or while extend-ing longitudinally, around the pipe with the surfaces of the ribs which are the parts of the structure in contact with the pipe being rounded and lying in a generally cylindrical surface and the structure, when so wrapped, offering an exterior discontinuous surface which is free of projections.
The wrapping structure is preferably made of a polymer. At least the following polymers can be used: polyethylene, polypropylene, poly-vinylidene chloride, polyvinylchloride, polychloroprene and synthetic and natural rubbers can also be used.
It is particularly preferred for the wrapping structure to be of a polymeric resilient material. A particular example of such a material which is suitable is air entrained polyethylene.
The purpose of this preferred feature is to provide for the wrapping structure to be better able to absorb the impact of rocks or other ; - 3 --: : .
lOS~O~l articles falling on the pipe, either when situated for use, or prior to being located in the desired position, with the minimum displacement or damage to the normally provided pipe wrap or the protective coating.
The ribs are rounded on one side of the structure. The ribs can be provided to project on one side of the structure, the structure then includ-ing a web in which the apertures are formed and which connects the ribs, the ribs preferably being parallel to each other. Alternative embodiments include two sets of parallel ribs, the ribs of the sets being inclined, preferably at right angles to each other. In this case the web is not essential and all ribs are rounded on the one side of the structure, the other side being generally planar. The centre lines of the ribs preferably lie in a single plane when the structure is laid flat, so that the rounded surfaces thereof will also lie in a single plane, with the result that when the structure is pulled tight on a pipe there are no projections to cut into the previously applied wrappings thereon.
The structure is to be wrapped around a pipe, to protect the normally provided coatings and wrappings, the rounded sides of the ribs facing inwardly so that only a small proportion of the structure is in physical contact with the pipe, or, more particularly, the exterior coating thereon, thus using the minimum contact area. This means that the exterior surface of the barrier is spaced from the pipe, so that sharp aggregate will in general be kept well clear of the pipe even if it can penetrate the apertures to some extent. The apertures will be quite small, up to 1 square inch (6.5 cms2) in area and preferably more than 0.4 cm2 in area, and comprise 90% to 40%, preferably about 50% of the area of the struct~re.
After pipe laying, the apertures permit the passage of the electrical current in a cathodic protection system.
The structure is preferably at least 36 inches (1 metre) wide, ' - ;' ' ' ' ~ -. :
-' . : .. ~ ~ . , ' : ' lO~
but narrower structures can be used if desired. Any length can be provided.
The ribs may be 1/8 to 1/4 inch, (0.3 to 0.6 cm) wide parallel to the general plane of the structure and preferably have a maximum depth, perpendicular to the structure of 3/8 inch ( 0.9 cms). They may be spaced apart trans-versely of their length to give a gap about equal to their width. The ribs are preferably parallel both for ease of formation and ease of application, and may be continuous.
The wrapping structure of the invention may be helically wound round a pipe, but if desired it can be wrapped round a pipe so that the ribs are parallel with the axis of the pipe; in the latter case adjacent edges of structure abut each other, and it can be kept in place by inter-lacing the adjacent edges with a cord or rope or by the use of non-metallic clips, or using self-locking straps or tapes provided, for instance, with a ratchet mechanism.
The invention also provides a pipe laid or to be laid below the ground or sea, the pipe being protected by a wrapping structure having a plurality of ribs and a plurality of apertures between the ribs, the structure being flexible and being wrapped around the pipe, with the surfaces of the ribs which are the parts of the structure in contact with the pipe lying in a generally cylindrical surface, and the apertures being exteriorly uncovered.
The present invention will now be described, by way of example, with reference to the accompanying drawings, wherein:
Figure 1 is a top-plan view of a portion of a length of a pipe wrapping structure of the present invention;
lO9V~9l FigQr~ 2 iB a crooo,-~ectional view of the structure dhown in Figure l;
, . F1gures.3A and 3B s~ow two methods of fixinq of the.
pipe wrap~ing structure shown in Figure~ 1 and 2~ ana . , Figure 4 ~how~ another form of pipe wrapping Jtructur ~, .~ according to,the in~ention.
Referring'$nltially to Figure~ 1 nd 2 -~h- pipe . . .''. '~tructure 10 comprises~an elongate web 11 with a plurality .' , -' o~ long1tud~nally extending, laterally spacea p rallel'-roun~d N : ,-,. ribs 12 on 0ne side. Intermediate the r.ibs 12, elongate "....... , . Aper*ur.es i3 are proviaed in rows in the web.: Ao ohown ln ~ : -'. ''' ~Figure'l the aperture~ 13 in ad~acent rows are s~agg-red. . ~
.::.. ,. . -. . . . . .
~ with respect to'each other. ' ' . . -' ,,,." . . ~he wrapping ~ructure, whidh may be of a polymeric . material'or other ~u~,able material, may be made.by -xtru-ion : '. or moulding. .If.de~ired the elon~ate aper~ure~'13 may be ,--: ~ ,formed by punchlnq.after the web 11 with the rib~ 12 integ~
therewith has been ~ormed.
. : -. The pipe wrapping ~tructure ~hown in Fiqures l and 2 . may be wrapF~d. helically about a pip 14'to be covere~ (F$gur 3B)-~or,may be arranged 80 that the ribs 12 extend generally '; p~ llel to the longitudinal axi~ of the pipé 14 aa in' .: Figure 3A. In either arrangement only the riba 12 cont~ct ~h ,~ur~ w e~of t~e pipe,14 with the web 11 apaced from the pi~
25," ' '~nd the area.of contact between #he wrappl~g ~tructur- lO.~nd ~ . , - . . .
-:'~' , the pipe 14 i8 kept to a n~n~ um. ~ , , ~ In th-.case o~ the ~iPe w~4pping ~tructure lO b lng . . . . ... . . .
~ : : .~ .
. . . - .
- . . - .
. .
.. - ~ . .- . . . -. .
-- .. . . .
'` ' '~ '' ' ' : ' : ' ''' ' .
'~" ' ' ' ~
1~0~91 secured with the rib-q 12 parallel to the longitudinal axi~ of ~he pipe 14 the longitudinal edge~ of .the web, or we~s in the case of two or more lengths of material being used, to iyLrrouDd the pipe, are held in butting relationship ~ lac-~
;'l~;.which pa~s through the apertures adjacent to the'butt~ng.
edge~ of the web'or we~ or by meanq of non-metallic cl~p~ which .
.'encircle the wrapping structure 10 when ~n position about . .
. ' ~ the pipe an~ clamp it to tbe pipe 14. An alternative i~ to uJe - . . . . .
'.' :.- ; ~trap_ or tapes which self-lock, e.g. by be~ng provided'with a 10'......... ratchet mechaniQm. ' ~ . ............................ .. `
.. . . .
In the embodimcnt ~b#wD in Figures 1 and 2, the'ribs are 1/4 inch (0.6 cm) wide at their maximu~ width, exten~
- the same amount upwardly fro~ the web and are spaced , ,, , :: approximately ~H ~1.25 cm) ketween centres., The apertures '15,' , 1-3~are made ao large as po~sible consistent with maint~inin~.
,,. , ~he~,desired ~trength ~n the web and yet ~mall enough~'.~ en~uro .. i . . - .
, . ;~th ~raggregate-io kept clear of the pipe aurfac-. Thi~
. . 'ensures that if cathodic prDtection has to be used t,hen .the. ,`, .. .. . .
`,', ''~ large nu~ber of aperture~ permit the paJ~age of the 2b ~ ! electrical current theretbrough. Typically the aperture~ ar- -. . :
, -,. 5/8~ ~1.6 cms~ long, 1/4~ ~.6 cm) wide and are ~eparat d - , length,'wise by'}/8" (0.3 cm). The apertur-s thu~ compriJe ust uDder half thei area of the weib.
Figure 4 shows an-alternative embodiment of wrapping . . .'~i5'' ; ' ~tructure according..to the invention comprising two ~et~ o~
arallel ribe' ext~nding at right angles to one ,ano~her.
;' - -., ~ Rectangular apertures.(41) are accordingly provided in.~he :. : . - - -1l ~ "'' '' ?
.
.. .. . .
: .
10~0~;91 structure, and it will be seen that the ribs- are rounded to one side of the structure, this being the ~ide which will be placed upon a pipe. The other side of the structure i8 substantially planar. The wrapping structure of thia- Figure i~ again attached by clips, laces or straps ~ a pipe with the rounded siaes of the ribs in contact therewith, or i~ helically ; nd on the pipe. In one embodi~ent accord~ng to Figure 4, ~the ribs have a maximum depth of about 0.4 cms, and~a w~dth ~ ~ - of 0.7, the apertures being i.2 cms long by 0.5 cms wid-.
io Although two alternative embodiments of the wrapping ~structure 10 have been descr~bea it should be undèrsbood that the wrapping structure may take many other forms. In gener~l -the wrapping structure has a small area of surface contact ~ ;~ with the pipe and at the same time provide~ a large ov-rall passage for the flow of electrical current in the event of cathodic protection having to be used.
~referably the wrapping structure will be of the order of 36 lnche~ (approximotely 90 cms) wide. Any length o structure can be provided. -. . . ~
:.
.. .. . ..
.
.
., .
-: ' ' - - .
Claims (14)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A wrapping structure for protecting a pipe to be laid below the ground or sea against damage by abrasion or impact while allowing a cathodic protection system for the pipe to function, the structure having a plurality of ribs and a plurality of apertures between the ribs, the ribs having a height of at least 0.2 cm perpendicular to the plane of the structure, the apertures each having an area of up to 6.5 cm2 and together occupying from 40% to 90% of the area of the structure, and the structure being of flexible plastics material and being elongate so as to be wrappable helically, or while extending longitudinally, around the pipe with the surfaces of the ribs which are the parts of the structure in contact with the pipe being rounded and lying in a generally cylindrical surface and the structure, when so wrapped, offering an exterior discontinuous surface which is free of projections.
2. A structure according to claim 1, which is of a material which is also resilient.
3. A structure according to claim 2, wherein the resilient material is air entrained polyethylene.
4. A structure according to claim 1, 2 or 3 wherein the apertures occupy about 50% of the area of the structure.
5. A structure according to claim 1, 2 or 3 wherein the ribs are from 0.3 to 0.6 cms wide parallel to the plane of the structure.
6. A structure according to claim 1, 2 or 3 wherein the gaps between the ribs are as wide as the ribs.
7. A structure according to claim 1 wherein the apertures are formed in a web which connects and is integral with the ribs, the ribs projecting on one side of the web.
8. A structure according to claim 7, wherein the ribs are parallel to each other.
9. A structure according to claim 1, wherein the structure comprises two sets of parallel ribs, the ribs of the sets being inclined to each other and the apertures being defined between the ribs.
10. A structure according to claim 9 wherein the sets of ribs are per-pendicular to each other.
11. A structure according to claim 1, 2 or 3 wherein the ribs are up to 0.9 cms deep, perpendicular to the plane of the structure.
12. A wrapping structure for protecting a pipe to be laid below the ground or sea against damage by abrasion or impact while allowing a cathodic protection system for the pipe to function, the structure comprising first and second mutually perpendicular sets of ribs with apertures defined between the ribs, the ribs having a height of at least 0.2 cm perpendicular to the plane of the structure, the apertures each having a surface area of up to 6.5 cm2 and together occupying from 40% to 90% of the area of the structure, the structure being of air entrained polyethylene so as to be flexible and resi-lient and being elongate so as to be wrappable helically, or while extending longitudinally around the pipe with the surfaces of the ribs which are the parts of the structure in contact with the pipe being rounded and lying in a generally cylindrical surface and the structure, when so wrapped, offering an exterior discontinuous surface which is free of projections.
13. A structure according to claim 12, wherein the apertures are 2.2 cms long by 0.5 cms wide, the ribs having a depth of 0.4 cms and a width of 0.7 cms.
14. A structure according to claim 1, 2 or 3 in which structure, when laid flat, the centre lines of the ribs lie in a single plane.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA353,421A CA1103141A (en) | 1975-04-11 | 1980-06-05 | Pipe wrapping structure |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB14992/75A GB1549847A (en) | 1975-04-11 | 1975-04-11 | Pipe wrapping structure |
| GB14992/75 | 1975-04-11 | ||
| GB1389/76 | 1976-01-14 | ||
| GB138976 | 1976-01-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1090691A true CA1090691A (en) | 1980-12-02 |
Family
ID=26236695
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA249,984A Expired CA1090691A (en) | 1975-04-11 | 1976-04-09 | Pipe protector |
Country Status (12)
| Country | Link |
|---|---|
| JP (1) | JPS6059479B2 (en) |
| AU (1) | AU508582B2 (en) |
| CA (1) | CA1090691A (en) |
| CH (1) | CH620025A5 (en) |
| DE (1) | DE2614793A1 (en) |
| DK (1) | DK144537C (en) |
| EG (1) | EG12367A (en) |
| ES (1) | ES446862A1 (en) |
| FR (1) | FR2307213A1 (en) |
| IT (1) | IT1061359B (en) |
| NL (1) | NL181455B (en) |
| NO (2) | NO149082C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106594417A (en) * | 2016-12-23 | 2017-04-26 | 周宝龙 | Pipeline reinforcing structure |
| WO2019056104A1 (en) * | 2017-09-25 | 2019-03-28 | Pipesak Inc. | Pipe protector |
| CN114396533A (en) * | 2021-12-31 | 2022-04-26 | 珠海新源热力有限公司 | Anti-corrosion device for steam directly buried pipeline and control method thereof |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT1114624B (en) * | 1977-07-01 | 1986-01-27 | Raci Spa | PERFECTED COLLAR FOR GAS PIPES |
| DE3214319C1 (en) * | 1982-04-19 | 1984-03-29 | Hoesch Werke Ag, 4600 Dortmund | Metal tube with corrosion and stone protection coating made of plastic |
| DE8716637U1 (en) * | 1987-12-17 | 1989-04-20 | Westfälische Kunststofftechnik GmbH, 4322 Sprockhövel | Protective pipe for the underground pipes of a gas pipeline |
| DE9309679U1 (en) * | 1993-06-30 | 1994-11-10 | Denso-Chemie Wedekind KG, 51371 Leverkusen | Underground pipe |
| DE19902996C2 (en) * | 1999-01-26 | 2002-09-12 | Gls Muenchen Baugmbh | Device and method for sheathing conduit pipes |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1894519A (en) * | 1930-04-28 | 1933-01-17 | Richard A Sperry | Drill pipe protector |
| US1960364A (en) * | 1930-07-08 | 1934-05-29 | Carol Supplies Inc | Antifriction bearing for casings |
| US3692607A (en) * | 1970-02-09 | 1972-09-19 | Samuel M Shobert | Method and apparatus for making a reinforced plastic well screen |
| DE2057542A1 (en) * | 1970-11-23 | 1972-06-08 | Ernst Vogelsang Fa Dipl Ing Dr | Porous plastic metal pipe sheath - made from granular thermoplastic resin |
-
1976
- 1976-04-06 DE DE19762614793 patent/DE2614793A1/en not_active Withdrawn
- 1976-04-09 FR FR7610549A patent/FR2307213A1/en active Granted
- 1976-04-09 CA CA249,984A patent/CA1090691A/en not_active Expired
- 1976-04-09 DK DK167576A patent/DK144537C/en active IP Right Grant
- 1976-04-09 CH CH457276A patent/CH620025A5/en not_active IP Right Cessation
- 1976-04-09 AU AU12853/76A patent/AU508582B2/en not_active Expired
- 1976-04-09 NL NLAANVRAGE7603775,A patent/NL181455B/en not_active IP Right Cessation
- 1976-04-09 IT IT22166/76A patent/IT1061359B/en active
- 1976-04-09 ES ES446862A patent/ES446862A1/en not_active Expired
- 1976-04-09 NO NO76761245A patent/NO149082C/en unknown
- 1976-04-10 JP JP51039840A patent/JPS6059479B2/en not_active Expired
- 1976-04-10 EG EG210/76A patent/EG12367A/en active
-
1983
- 1983-02-14 NO NO830492A patent/NO151982C/en unknown
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106594417A (en) * | 2016-12-23 | 2017-04-26 | 周宝龙 | Pipeline reinforcing structure |
| WO2019056104A1 (en) * | 2017-09-25 | 2019-03-28 | Pipesak Inc. | Pipe protector |
| US10920909B2 (en) | 2017-09-25 | 2021-02-16 | 1552818 Ontario Limited | Pipe protector |
| CN114396533A (en) * | 2021-12-31 | 2022-04-26 | 珠海新源热力有限公司 | Anti-corrosion device for steam directly buried pipeline and control method thereof |
| CN114396533B (en) * | 2021-12-31 | 2023-08-01 | 珠海新源热力有限公司 | Corrosion prevention device for steam direct-buried pipeline and control method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| NO151982B (en) | 1985-04-01 |
| NO149082B (en) | 1983-10-31 |
| NO830492L (en) | 1976-10-12 |
| NL181455B (en) | 1987-03-16 |
| NL7603775A (en) | 1976-10-13 |
| EG12367A (en) | 1981-03-31 |
| NO151982C (en) | 1985-07-10 |
| AU508582B2 (en) | 1980-03-27 |
| CH620025A5 (en) | 1980-10-31 |
| NO149082C (en) | 1984-02-08 |
| JPS51124826A (en) | 1976-10-30 |
| DK167576A (en) | 1976-10-12 |
| AU1285376A (en) | 1977-10-13 |
| DK144537B (en) | 1982-03-22 |
| DE2614793A1 (en) | 1976-10-21 |
| IT1061359B (en) | 1983-02-28 |
| JPS6059479B2 (en) | 1985-12-25 |
| NO761245L (en) | 1976-10-12 |
| FR2307213B1 (en) | 1981-10-23 |
| ES446862A1 (en) | 1977-06-01 |
| DK144537C (en) | 1982-09-06 |
| FR2307213A1 (en) | 1976-11-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |