Process for cleaning tube type heat exchangers
CA 1279638 C · Owner: Hagewood, Brown T. · Inventors: Hagewood, Brown T.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved process for cleaning heat exchanger tubes using propellant water to shoot a cleaning member eg. a pig brush, scraper, or similar device through the heat exchanger tubes. The improvement includes adding treatment chemicals individually or in combination to the propellant water so that corrosion mechanical wear, or scaling of the heat exchanger tubes are controlled. The treatment chemicals include eg. ferrous, sulfate, sodium hypochlorite or hydrogen peroxide. Other, chemicals such as oxidizers, reducers, acids, bases inorganics, and organics when added in sufficient concentration will reduce heat exchanger tube corrosion, mechanical wear and scale.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted January 29, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 29, 2008.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.