EP0290184A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Pipe renovation system
Assignee: Angus Fire Armour Ltd
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Filing: 1988-04-26
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Granted: —
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Expires: 2008-04-26
Abstract
Abstract A method of lining an existing pipe (11) comprises pulling through it a collapsible, flexible, lay-flat liner (10) having an innermost layer 13 of impervious, elastomeric material which is compatible with the fluid to be carried by the pipe, a textile reinforcing intermediate layer, (14), and an external protective layer (15) of elastomeric material, the said liner having an external peripheral length slightly less than the internal peripheral length of the pipe (11) and being such that flow of said fluid through the liner (10) after the installation thereof expands the liner into non-bonding contact with the internal surface of the pipe. The peripheral extension (diametral swell) of the liner at the intended working pressure of the relined pipe should be less than 10% and preferably less than 5%. A method of sealing attachment of the ends of the liner and a method of forming branch connections to the lined pipe are also disclosed.
Inventors
- 👤 Alan Rodriguez
- 👤 John Arthur Rose
- 👤 Clifford Brian Waller
- 👤 Anthony William Doyle
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 06:14
CPC Classifications
F; F16; F16L; F16L55/00; F16L55/16; F16L55/162; F16L55/165; F16L55/1652; F16L55/1654; F16L55/179
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
96 words
A method of lining an existing pipe comprising pulling through it a collapsible, flexible, lay-flat tubular liner having an innermost layer of impervious, elastomeric material which is compatible with the fluid to be carried by the pipe, a textile reinforcing intermediate layer, and an external protective layer of elastomeric material, the said liner having an external peripheral length slightly less than the internal peripheral length of the pipe and being such that pressure of said fluid in the liner after the installation thereof expands the liner into non-bonding contact with the internal surface of the pipe.
Claim 2
Independent Claim
96 words
A method of lining an existing pipe comprising pulling through it a collapsible, flexible, lay-flat tubular liner having an innermost layer of impervious, elastomeric material which is compatible with the fluid to be carried by the pipe, a textile reinforcing intermediate layer, and an external protective layer of elastomeric material, the said liner having an external peripheral length slightly less than the internal peripheral length of the pipe and being such that pressure of said fluid in the liner after the installation thereof expands the liner into non-bonding contact with the internal surface of the pipe.
Claim 3
Dependent Claim
25 words
A method as claimed in claim 1, characterised in that the diametral swell of the liner at the intended working pressure is less than 10%.
Claim 4
Dependent Claim
25 words
A method as claimed in claim 1, characterised in that the diametral swell of the liner at the intended working pressure is less than 5%.
Claim 5
Independent Claim
116 words
A method as claimed in any one of claims 1 to 3, characterised in that the liner projects beyond the pipeline at each end of the latter and in that a coupling is connected to each projecting end of the liner and comprises first and second members, the first member having an externally-tapered tubular portion inserted smaller end first into said projecting end and the second member having an annular portion engaging the external surface of said projecting end, said first and second members being adjustably connected together for axial movement of said annular portion relative to said tubular portion whereby said projecting end is sealingly and clamped between said tubular portion and said annular portion.
Claim 6
Dependent Claim
29 words
A method as claimed in claim 4, characterised in that said tubular portion is conically tapered, and said annular portion is conically tapered for cooperation with said tubular portion.
Claim 7
Dependent Claim
68 words
A method as claimed in claim 4 or claim 5, characterised in that said adjustable connection between the first and second members is constituted by bolts secured to and extending axially from a flange surrounding the tubular portion of the first member which bolts are receivable in corresponding holes formed in said second member, a nut being provided on each bolt on each side of the second member.
Claim 8
Independent Claim
55 words
A method as claimed in any of claims 1 to 6, characterised in that for the formation of a branch or service connection to the pipeline, a supply of air or inert gas into the liner is maintained under a pressure sufficient to expand the lining into engagement with the internal surface of the pipeline.
Claim 9
Dependent Claim
140 words
A method as claimed in claim 7, characterised by the steps of cutting a hole in the liner and, if not already provided, in the pipe at the location of the branch, and inserting into the interior of the liner through the holes a bolt having a through-bore and a shoulder at the internal end of the bolt, placing or the shank of the bolt and manipulating through said hole in the liner washer means having a greater diameter than said hole in the liner and having an internal diameter less than that of the shoulder placing on the shank of the bolt an external washer the inner face of which engages the liner about the periphery of the hole therein clamping the liner between said washer means and the external washer, and securing the bolt relative to the pipe.
Claim 10
Dependent Claim
59 words
A method as claimed in claim 8, characterised in that the washer means comprises an elastomeric washer for sealingly engaging the internal surface of the marginal portion of the liner tube and for sealingly engaging the shank of the bolt and a main washer which in use, is disposed between said elastomeric washer and the shoulder of said bolt.
Claim 11
Dependent Claim
47 words
A method as claimed in claim 8 or claim 9, characterised in that said main washer is constituted by two or more interengaging annularly incomplete washers which, when interengaged and in use, provide a substantially continuous, annular externally facing surface against which the elastomeric washer is clamped.
References Cited (Backward Citations)
DE2728056A1
Cited
DE2912840A1
Cited
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