Patent US4054174A successfully refreshed from Google Patents.
US4054174A
Expired / Lapsed
US
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Method of inhibiting deposition of internal corrosion products in tubes
Assignee: Babcock and Wilcox Co
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Filing: 1975-10-03
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Granted: 1977-10-18
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Expires: 1995-10-03
Abstract
Abstract A method for inhibiting the deposition of porous solid products on the internal surface of fluid conducting tubes in a heat absorbing zone of a steam generating unit by the use of internally plated tubes.
Inventors
- 👤 Kurt H. Haller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:07
CPC Classifications
F; F28; F28F; F28F19/00; F28F19/02; F28F19/06; F22; F22B; F22B37/00; F22B37/02; F22B37/04; Y; Y10; Y10S; Y10S122/00; Y10S122/13
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
102 words
The method of inhibiting the deposition in solid form on the inside surfaces of heat absorbing vaporizable liquid conducting tubes of suspended solids, consisting principally of magnetite, Fe 3 O 4 , transported by the liquid in the tubes which have their outside surfaces exposed to hot gases and are embodied in a closed cycle vapor generating system wherein almost all of the vapor generated is recovered as condensate and returned to the tubes, which comprises using ferrous metal tubes having a film of a non-ferrous metal on the inside surfaces of the tubes which has been applied in a known manner.
Claim 2
Independent Claim
102 words
The method of inhibiting the deposition in solid form on the inside surfaces of heat absorbing vaporizable liquid conducting tubes of suspended solids, consisting principally of magnetite, Fe 3 O 4 , transported by the liquid in the tubes which have their outside surfaces exposed to hot gases and are embodied in a closed cycle vapor generating system wherein almost all of the vapor generated is recovered as condensate and returned to the tubes, which comprises using ferrous metal tubes having a film of a non-ferrous metal on the inside surfaces of the tubes which has been applied in a known manner.
Claim 3
Dependent Claim
14 words
The method of claim 1 wherein the film of a non-ferrous metal is chromium.
Claim 4
Dependent Claim
14 words
The method of claim 1 wherein the film of a non-ferrous metal is nickel.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-17 | 1981-04-18 | 1981-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-17 | 1985-04-18 | 1985-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-17 | 1989-04-18 | 1989-10-18 | $7700.00 | Window Closed / Lapsed |