EP0035851A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Pipe seal especially for use with insulated pipes, and pipe containing such a seal
Assignee: Raychem Ltd
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Filing: 1981-02-27
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Granted: —
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Expires: 2001-02-27
Abstract
Abstract A seal for preventing ingress or escape of fluid through a portion of a pipe (1) comprises a cover (10) which is preferably dimensionally-recoverable and is coated pn at least part of one surface thereof with a layer of sealant which will adhere to the pipe and which, when subjected to a strain in a peel mode applied between the cover (10) and pipe (1) sufficientto cause the adhesive bond so formed to fail, will fail cohesively at a temperature below -10°, preferably below -15°C and especially below-20°C. The seal is especially suitable for use on insulated pipes which are often used at low ambient temperatures, for example district heating pipes.
Inventors
- 👤 Klaus Peter Goetze
- 👤 Paul Peigneur
- 👤 David John Barker
- 👤 Nicholas Thomas Corke
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 20:22
CPC Classifications
F; F16; F16L; F16L59/00; F16L59/14; F16L59/16; F16L59/18; F16L59/20; F16L58/00; F16L58/02; F16L58/16
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
91 words
A seal for preventing or reducing ingress or escape of fluid through a portion of a pipe, which comprises a cover adapted to be positioned about the said portion of the pipe, the cover having a surface, at least part of which is provided with a layer of sealant which will adhere to the pipe and which, when subjected to a strain in the peel mode applied between the cover and the pipe sufficient to cause the adhesive bond so formed to fail, will fail cohesively at a temperature below -10°C.
Claim 2
Dependent Claim
91 words
A seal for preventing or reducing ingress or escape of fluid through a portion of a pipe, which comprises a cover adapted to be positioned about the said portion of the pipe, the cover having a surface, at least part of which is provided with a layer of sealant which will adhere to the pipe and which, when subjected to a strain in the peel mode applied between the cover and the pipe sufficient to cause the adhesive bond so formed to fail, will fail cohesively at a temperature below -10°C.
Claim 3
Dependent Claim
20 words
A seal as claimed in claim 1, wherein the sealant has a glass transition temperature below -40°C, preferably below -50°C.
Claim 4
Dependent Claim
30 words
A seal as claimed in claim 1 or claim 2, wherein the sealant has a viscosity at 160°C of not more than 120 PaS, preferably not more than 80 PaS.
Claim 5
Dependent Claim
42 words
A seal as claimed in any one of claims 1to 3, wherein the sealant comprises: (a) upto 15% be weight of a rubbery component, (b) at least 40% by weight of a plasticiser, (c) a tackifier, and (d) a crystalline reinforcing agent.
Claim 6
Dependent Claim
42 words
A seal as claimed in claim 6, wherein the rubbery component comprises a polyisobutylene having a viscosity average molecular weight Mv of at least 300,000, and the plasticiser comprises a polyisobutylene having a viscosity average molecular weight Mv of up to 100,000.
Claim 7
Dependent Claim
17 words
A seal as claimed in any one of claims 1 to 5, wherein the cover is dimensionally-recoverable.
Claim 8
Dependent Claim
110 words
An arrangement for protecting a thermally insulated pipe, which comprises a cover adapted to be positioned about a portion of the insulated pipe to prevent or reduce ingress or escape of fluid through the said portion, and means for preventing or detecting penetration of water along the insulation of the pipe, the cover having a surface at least part of which is provided with a layer of sealant which will adhere to the pipe and which, when subjected to a strain in the peel mode applied between the cover and the pipe sufficient to cause the adhesive bond so formed to fail, will fail cohesively at a temperature below -10°C.
Claim 9
Dependent Claim
110 words
An arrangement for protecting a thermally insulated pipe, which comprises a cover adapted to be positioned about a portion of the insulated pipe to prevent or reduce ingress or escape of fluid through the said portion, and means for preventing or detecting penetration of water along the insulation of the pipe, the cover having a surface at least part of which is provided with a layer of sealant which will adhere to the pipe and which, when subjected to a strain in the peel mode applied between the cover and the pipe sufficient to cause the adhesive bond so formed to fail, will fail cohesively at a temperature below -10°C.
Claim 10
Dependent Claim
146 words
An arrangment for protecting a portion of a thermally insulated pipe which comprises at least one barrier for preventing penetration of water along the insulation of the pipe, the or each barrier adapted to be positioned between two lengths of insulation of the pipe so that it extends radially from the pipe to the external surface of the insulation, and a cover adapted to be positioned about a portion of the insulated pipe so that it extends across the or at least one barrier, at least part of one surface of the cover being provided with a layer of sealant which will adhere to the external surface of the pipe and which, when subjected to a strain in a peel mode applied between the cover and the pipe sufficient to cause the adhesive bond so formed to fail, will fail cohesively at a temperature below -10°C.
Claim 11
Dependent Claim
146 words
An arrangment for protecting a portion of a thermally insulated pipe which comprises at least one barrier for preventing penetration of water along the insulation of the pipe, the or each barrier adapted to be positioned between two lengths of insulation of the pipe so that it extends radially from the pipe to the external surface of the insulation, and a cover adapted to be positioned about a portion of the insulated pipe so that it extends across the or at least one barrier, at least part of one surface of the cover being provided with a layer of sealant which will adhere to the external surface of the pipe and which, when subjected to a strain in a peel mode applied between the cover and the pipe sufficient to cause the adhesive bond so formed to fail, will fail cohesively at a temperature below -10°C.
Claim 12
Dependent Claim
42 words
An arrangement as claimed in claim 7 or claim 8, wherein the sealant comprises: (a) up to 15% be weight of a rubbery component, (b) at least 40% by weight of a plasticiser, (c) a tackifier, and (d) a crystalline reinforcing agent.
Claim 13
Dependent Claim
17 words
An arrangement as claimed in any one of claims 7 to 9, wherein the cover is dimensionally-recoverable.
Claim 14
Dependent Claim
14 words
An arrangement as claimed in claim 8, wherein the or each barrier is dimensionally-recoverable.
Claim 15
Dependent Claim
83 words
An arrangement as claimed in claim 11, wherein the or each barrier has a portion that is adapted to be recovered over the external surface of the insulated pipe and is provided with a layer of sealant which will adhere to the external surface of the pipe and which, when subjected to a strain in a peel mode applied between the cover and the pipe sufficient to cause the adhesive bond so formed to fail, will fail cohesively at a temperature below -10°C.
Claim 16
Dependent Claim
87 words
A pipe that is protected from ingress or escape of fluid through a portion thereof by means of a cover positioned about the caid portion of the pipe, at least part of one surface of the cover being provided with a layer of sealant which adheres to the external surface of the pipe and which, when subjected to a strain in the peel mode applied between the cover and the pipe sufficient to cause the bond so formed to fail, will cohesively at a temperature below -10°C.
Claim 17
Dependent Claim
87 words
A pipe that is protected from ingress or escape of fluid through a portion thereof by means of a cover positioned about the caid portion of the pipe, at least part of one surface of the cover being provided with a layer of sealant which adheres to the external surface of the pipe and which, when subjected to a strain in the peel mode applied between the cover and the pipe sufficient to cause the bond so formed to fail, will cohesively at a temperature below -10°C.
References Cited (Backward Citations)
No citation records indexed.
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