Abstract: A method of removing animal growth organisms and such foreign material from the inside surface of an underwater pipe extended at its outlet end into a wet well at a pumping shore station, by inserting a bladed cleaning device in the pipe at the wet well and pulling it to a spaced inlet end of the pipe, the cleaning device having stationary rigid circumferential and radial cutting edges suited to core chuncks of foreign matter free from the pipe surface and dice them into smaller pieces of the foreign material. The method further provides injecting fluid under pressure from the cleaning device toward the bottom of the pipe as a fluid stream of sufficient velocity for raising the foreign matter chuncks and pieces into suspension with water in the pipe, and pulling the cleaning device axially within the pipe back toward the wet well.

Abstract: A bladed cylindrical member with high pressure fluid jet nozzles cuts and sweeps aquatic foreign matter from the inside surface of underwater pipes. The method for removing the foreign matter includes reciprocally pulling the device through the pipe and injecting high pressure air into a containment area to force any extricated foreign matter to the surface.

Abstract: An apparatus for dispersing chemicals into an underwater pipe comprising first and second chemical feed pipes, the feed pipes being mounted to an intake pipe forming part of the underwater pipe, the first feed pipe extending along the length of the intake pipe and being connected to the second feed pipe, the second feed pipe being mounted to the intake pipe at that portion of the intake pipe adjacent an intake pipe opening, the second feed pipe including a plurality of inwardly extending releasing valves for dispensing chemicals into the intake pipe, the chemicals being delivered to the second feed pipe through the first feed pipe. A cone-shaped device is also disclosed for inserting the first chemical feed pipe into the intake pipe, the cone-shaped device having first and second cone elements coaxially spaced apart to form an air pocket therebetween.

Abstract: An apparatus for dispersing chemicals into an underwater pipe comprising first and second chemical feed pipes, the feed pipes being mounted to an intake pipe forming part of the underwater pipe, the first feed pipe extending along the length of the intake pipe and being connected to the second feed pipe, the second feed pipe being mounted to the intake pipe at that portion of the intake pipe adjacent an intake pipe opening, the second feed pipe including a plurality of inwardly extending releasing valves for dispensing chemicals into the intake pipe, the chemicals being delivered to the second feed pipe through the first feed pipe.