GB925575A - Process and apparatus for distributing liquid growth deterrent over underwater surfaces - Google Patents

Abstract

925,575. Preventing incrustation; delivering measured quantities of liquid. DISTILLERS CO. Ltd. Jan. 22, 1962 [Feb. 4, 1961], No. 4281/61. Classes 106 (5) and 123 (1). A process for preventing the fouling by marine growths of an underwater surface, particularly of a ship's hull, comprises injecting a liquid growth deterrent under pressure and intermittently into a perforated pipe system, the liquid growth deterrent being ejected through the perforations to contact the underwater surface. Distribution of the liquid deterrent may be assisted by a gas supplied independently to the underwater surface as described in Specification 925,573. Non- return valves (Fig. 1, not shown), may be associated with each perforation as described in Specification 925,574. The preferred deterrents are kerosene and light diesel oils. A metering pump B draws liquid deterrent from a reservoir A and supplies it to a container C in which a plunger F actuated by spring H maintains the liquid under pressure. When a predetermined volume of liquid is reached in the container C the valve E is opened automatically for a short period allowing the injection of liquid under pressure into pipe-system D from which it escapes through the perforations to contact the surface to be protected. The pipe may be coated with a plastic material to prevent corrosion. Specifications 851,902, 852,268 and 852,882 also are referred to.