# US 5,348,801 A · Tape for reinforcing pressure-supporting hollow bodies and a method for repairing deteriorated pipes

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 5,348,801 A
- Document ID: US5348801A
- Status: Granted
- Kind: A
- Application number: 08/062,546
- Filed: 1993-05-18
- Granted: 1994-09-20
- Earliest claimed: 1992-05-22
- Assignees: Snam S.p.A.
- Inventors: Stefano Venzi; Adalberto Colombo
- Web page: https://patentgrep.com/patent/US5348801A

## CPC

- B32B 27/12: next to a fibrous or filamentary layer
- B32B 7/12: using interposed adhesives or interposed materials with bonding properties
- B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)}
- F16L 1/26: Repairing or joining pipes on or under water
- F16L 55/1686: {by winding a tape}
- F16L 58/16: the coating being in the form of a bandage
- B32B 2309/105: Thickness
- Y10T 428/2843: including a primer layer
- Y10T 428/2848: Three or more layers
- Y10T 428/2852: Adhesive compositions
- Y10T 428/2857: including metal or compound thereof or natural rubber
- Y10T 442/678: Olefin polymer or copolymer sheet or film [e.g., polypropylene, polyethylene, ethylene-butylene copolymer, etc.]
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- F16L: PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A method for repairing and reinforcing pressure-supporting hollow bodies, in particular deteriorated underwater pipelines, using a tape formed from a plurality of layers.

## Claims

### Claim 1

A multi-layer tape which maintains its structure in an apparatus which applies a tension of between 50 and 250 kg to the tape, for reinforcing pressure-supporting hollow bodies, comprising:
a) a first layer of profiled strips composed of continuous unidirectional fibers embedded in a thermoplastic resin, said fibers having a softening point exceeding that of the thermoplastic resin;
b) a second adhesive layer comprising rubber based compositions;
c) a third layer comprising a thermoplastic polymeric composition; and
d) a fourth adhesive layer comprising rubber based compositions.

### Claim 2 (depends on 1)

The tape as claimed in claim 1, wherein a thin layer of primer is provided on the outer surface of the tape.

### Claim 3 (depends on 1, 2)

The tape as claimed in claim 1 or 2, wherein the tape has a width at a value ranging from 8 to 20 mm and a thickness at a value ranging from 0.2 to 2 mm.

### Claim 4 (depends on 3)

The tape as claimed in claim 3, wherein the tape has a thickness of a value ranging from 0.8 to 1.5 mm.

### Claim 5 (depends on 4)

The tape as claimed in claim 4, wherein the tape has a thickness of a value ranging from 0.9 to 1.2 mm.

### Claim 6 (depends on 1)

The tape as claimed in claim 1, wherein the profiled strips are constituted of poly(p-phenyleneterephthalamide) fibers in an aliphatic polyamide resin.

### Claim 7 (depends on 6)

The tape as claimed in claim 6, wherein the aliphatic polyamide resin is nylon 12.

### Claim 8 (depends on 1, 2)

The tape as claimed in claim 1 or 2, wherein the adhesive layers (b) and (d) are primarily comprised of butyl rubber mixed with an adhesion promoting synthetic resin.

### Claim 9 (depends on 1, 2)

The tape as claimed in claim 1 or 2, wherein the plastic support film (c) is a film of polyolefin mixed with elastomer.

### Claim 10

A multi-layer tape which maintains its structure in an apparatus which applies a tension of between 50 and 250 kg to the tape, for reinforcing pressure-supporting hollow bodies, comprising:
a) a first layer of profiled strips composed of continuous unidirectional fibers selected from the group consisting of asbestos fibers, glass fibers, boron fibers, carbon fibers, graphite fibers, and aromatic polyamide fibers embedded in a thermoplastic resin;
b) a second adhesive layer comprising rubber based compositions;
c) a third layer comprising a thermoplastic polymeric composition; and
d) a fourth adhesive layer comprising rubber based compositions.

### Claim 11 (depends on 1, 2)

A method for repairing and reinforcing hollow, pressurized bodies which have deteriorated and which have been installed either on land or in water, comprising:
wrapping said bodies with partially superposed layers of a pretension tape as described in claim 1 or 2.