US5007461A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the cleaning of the interior of installed conduits
Assignee: Intertechno AG
•
Filing: 1988-06-07
•
Granted: 1991-04-16
•
Expires: 2008-06-07
Abstract
Abstract A method for the repair of the inside of installed conduits comprises the following method steps: drying of the inside of the line by flow-through of pre-dried compressed air, removal of interior coatings by flow-through of a mixture of compressed air and particles of an abrasive medium with a mean exterior diameter of >0.8 mm and a specific weight of >3.0 g·cm -3 in an amount of >1.0 g·m -3 , the mixture flowing through the line with a mean speed of >10 m·s -1 , relative to normal pressure, and blowing out the line by means of pre-dried compressed air. The adhesive resin utilized for the subsequent coating contains, among others, a solvent-free 2-component resin and at least 5% by weight of finely dispersed inorganic oxidic adhesives.
Inventors
- 👤 Werner Naf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:21
CPC Classifications
B; B05; B05D; B05D7/00; B05D7/22; B05D7/222; B24; B24C; B24C1/00; B24C1/08; B24C1/086; B24C3/00; B24C3/32; B24C3/325; B24C3/327; F; F16; F16L; F16L58/00; F16L58/02; F16L58/04; F16L58/10; F16L58/1009; B05D1/00; B05D1/02; B05D3/00; B05D3/12
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
186 words
A method of repairing, cleaning and coating the inside of an installed conduit, comprising the steps of: drying the inside of a conduit to be coated by flow-through of pre-dried compressed air, flowing-through the inside of said conduit a mixture of compressed air and particles of an abrasive medium with a mean exterior diameter of >0.8 mm and a specific weight of >3.0 g cm -3 in an amount of >1.0 g m -3 , said mixture flowing through said conduit with a mean speed of >10 m s -1 to remove materials adhering to the inside wall of said conduit, cleaning said conduit by flowing-through pre-dried and preheated compressed air until the outside temperature of the line is >40° C. to remove any remaining materials which have been removed from the inside wall of said conduit, and subsequently coating the inside of the conduit by means of blowing in and blowing around an adhesive resin by means of compressed air, said adhesive resin being a solvent-free, self-setting resin with at least 5% by weight of inorganic oxidic adhesives with a mean diameter of <0.08 mm.
Claim 2
Independent Claim
186 words
A method of repairing, cleaning and coating the inside of an installed conduit, comprising the steps of: drying the inside of a conduit to be coated by flow-through of pre-dried compressed air, flowing-through the inside of said conduit a mixture of compressed air and particles of an abrasive medium with a mean exterior diameter of >0.8 mm and a specific weight of >3.0 g cm -3 in an amount of >1.0 g m -3 , said mixture flowing through said conduit with a mean speed of >10 m s -1 to remove materials adhering to the inside wall of said conduit, cleaning said conduit by flowing-through pre-dried and preheated compressed air until the outside temperature of the line is >40° C. to remove any remaining materials which have been removed from the inside wall of said conduit, and subsequently coating the inside of the conduit by means of blowing in and blowing around an adhesive resin by means of compressed air, said adhesive resin being a solvent-free, self-setting resin with at least 5% by weight of inorganic oxidic adhesives with a mean diameter of <0.08 mm.
Claim 3
Dependent Claim
28 words
A method in accordance with claim 1, wherein said abrasive medium particles have a mean diameter of 0.8 to 8.0 mm, preferably one of 2 to 4 mm.
Claim 4
Dependent Claim
14 words
A method in accordance with claim 1, wherein said mean speed is >50 m/s.
Claim 5
Dependent Claim
16 words
A method in accordance with claim 1, wherein said pressure in said conduit is >1 bar.
Claim 6
Dependent Claim
23 words
A method in accordance with claim 1, wherein addition of said adhesive resin after its preparation takes place in the form of plugs.
Claim 7
Dependent Claim
28 words
A method in accordance with claim 1, wherein a pressure difference required for the flow through the conduit is created at least partially by means of a vacuum.
References Cited (Backward Citations)
US2331824A
Cited
US3139704A
Cited
US3073687A
Cited
US3307996A
Cited
DE1471510A1
Cited
US3946125A
Cited
US4022935A
Cited
US4233101A
Cited
US4327132A
Cited
FR2526124A1
Cited
US4505613A
Cited
DE3235506A1
Cited
GB2140337A
Cited
DE3429881A1
Cited
JPS6223484A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-04-15 | 1994-10-15 | 1995-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-15 | 1998-10-15 | 1999-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-04-15 | 2002-10-15 | 2003-04-16 | $7700.00 | Window Closed / Lapsed |