Title:
配管からの妨害物の除去方法
Document Type and Number:
Japanese Patent JP4443233
Kind Code:
B2
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.
Inventors:
Dennis, Ian Stewart
May Hiyu, Philip Antonio
May Hiyu, Philip Antonio
Application Number:
JP2003585110A
Publication Date:
March 31, 2010
Filing Date:
April 07, 2003
Export Citation:
Assignee:
New Clear Decommissioning Authority
International Classes:
G21F9/28; C02F5/00; C02F5/08; C09K3/00; C23G1/02; G21C17/01; G21F9/00; G21F9/30
Domestic Patent References:
| JP2001189291A |
Foreign References:
| GB1250357A |
Attorney, Agent or Firm:
Patent business corporation Odashima patent office