Cleaning and liquid contact with solids – Processes – Hollow work – internal surface treatment
Reexamination Certificate
2006-05-23
2006-05-23
Boyer, Charles (Department: 1751)
Cleaning and liquid contact with solids
Processes
Hollow work, internal surface treatment
C134S022100, C134S022120, C134S022130, C134S022160, C134S026000, C134S028000, C134S035000, C510S188000, C510S195000, C510S209000, C510S219000
Reexamination Certificate
active
07047985
ABSTRACT:
The invention provides a method for the removal of contaminating materials from pipework, the contaminating materials comprising deposits on the pipework which cause a reduction in the effective internal diameter of the pipes and thereby effect a reduction in the rate of flow of a fluid through the pipework, the method comprising treating the contaminating materials with at least one carbamate salt. The methods is also suitable for the treatment of contaminating materials which have a particularly deleterious effect on fluid flow and comprise partial or total blockages of the pipework. The carbamate is preferably in the form of an aqueous solution, and a preferred carbamate salt is ammonium carbamate. The treatment may be carried out in the presence of an additive such as caesium carbonate or ammonium bicarbonate. Optionally the treatment may be accompanied by a pre-treatment or post-treatment with aid, this being followed by a water wash. The method finds particular application in the nuclear processing industry.
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Dennis Iain Stewart
Mayhew Phillip Antony
Barrett William A.
Boyer Charles
British Nuclear Fuels PLC
Moore & Van Allen PLLC
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