Process for repairing small leaks in metallic vessels

Details Process for repairing small leaks in metallic vessels Process for repairing small leaks in metallic vessels

1978-11-20

1981-03-17

Husar, Francis S.

Metal working

Method of mechanical manufacture

Repairing

156 94, 220363, 220364, 2940218, 29530, B23P 700

Patent

active

042558450

ABSTRACT:
Porosity or other types of small leaks in metallic vessels designed to hold fluids under pressure or partial vacuum are repaired by: (1) sealing the chamber of the vessel, (2) introducing (preferably inert) gas at high pressure into the chamber, (3) immersing the vessel in a liquid (water) bath to locate and mark the leak(s), (4) mechanically cleaning the leak areas(s) while the gas pressure is maintained, (5) releasing the gas pressure and drawing a high partial vacuum in the chamber, (6) applying solvent to the leak area(s) to be suction-drawn through, and to clean, the leak(s), (7) while maintaining the partial vacuum, applying a liquid epoxy cement filled with a powdered metal compatible with that of the vessel, and (8) promptly heating the repaired area(s) to a moderate temperature and then releasing the vacuum. The repair will set in a few minutes and cure in several hours. The repair area(s) can be lightly abrasion-cleaned to remove any excess cement.

REFERENCES:
patent: 2727650 (1955-12-01), Moynihan et al.
patent: 2903877 (1959-09-01), Meade
patent: 3251461 (1966-05-01), Smith
patent: 3465420 (1969-09-01), Webb et al.
patent: 3645816 (1972-02-01), Billias et al.
patent: 4073836 (1978-02-01), Harrison et al.
patent: 4175311 (1979-11-01), Bunyan

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