American Cast Iron Pipe Company

William E Snow

Edwin H Phelps

Carl P Farlow

Joel P Sutherland

Thomas R Warren

High speed pipe lining is accomplished by supporting a length of pipe to be lined between spindles in a lathe-type apparatus and rotating the pipe at a speed sufficient to afford a G-force of the order of 10-15 G's. A rather fluid concrete mixture comprising gap-graded sand is introduced into the interior of the rotating pipe using a cantilevered trough. The rotational speed of the pipe is then increased substantially to afford a force of the order of 35-50 G's, and the pipe is subjected to high amplitude axial vibrations for a period of time of the order of one minute or less. The resulting concrete lining is highly compacted, quite dense and hard, and has a smooth surface.

High speed pipe lining method and apparatus

A method and apparatus for coating metal pipe with a thixotropic coating having a wet film thickness between 30 to 120 mils. The coating is a coal tar epoxy made up of a two component resin and pigment blend with the pigment comprising two sizes of glass beads. The coating material is applied via a slinger rotated within the bore of a pipe while it is moved slowly end to end past the slinger. The coating material is discharged from the slinger in a 360.degree. radial pattern in a plane substantially perpendicular to the axis of the pipe and direction of movement so as to cause a build up of a ring of the material of uniform thickness and thereby form incrementally, but continuously, due to continuous movement of the pipe, a coating of uniform thickness. The pipe is thereafter rotated while the coating is wet to develop a centrifugal force in the range of 50 g to 100 g. The pipe may also be vibrated while being rotated to enhance depletion of air bubbles and spread of coating into cracks and interstices in the internal surface of the pipe and form a smooth lining.

Method and apparatus for coating the interior surface of metal pipes

A method for coating metal pipe with a thixotropic coating having a wet film thickness between 30 to 120 mils. The coating is a coal tar epoxy made up of a two component resin and pigment blend with the pigment comprising two sizes of glass beads. The coating material is applied via a slinger rotated within the bore of a pipe while it is moved slowly end to end past the slinger. The coating material is discharged from the slinger in a 360.degree. radial pattern in a plane substantially perpendicular to the axis of the pipe and direction of movement so as to cause a build up of a ring of the material of uniform thickness and thereby form incrementally, but continuously, due to continuous movement of the pipe, a coating of uniform thickness. The pipe is thereafter rotated while the coating is wet to develop a centrifugal force in the range of 50 g to 100 g. The pipe may also be vibrated while being rotated to enhance depletion of air bubbles and spread of coating into cracks and interstices in the internal surface of the pipe and form a smooth lining.

Method for coating the interior surface of metal pipes

A filled, low or medium density polyethylene or other polyolefin composition is used to form a polymer coating on an internal cylindrical metal surface such as, for example, the interior surface of a pipe.

Method of forming a filled polymer coating on an internal cylindrical

Apparatus is disclosed for feeding an inoculating or nucleating agent or particle to a trough of a pipe casting apparatus or beneath the surface of molten metal within a ladle. In particular, the agents are introduced by a hopper into a sealed chamber by selectively actuatable valves. A gas compatible with the agent to be used in the casting process, is introduced into the sealed chamber, whereby a relatively low pressure is established therein. An agent feeder, such as a vibratory feeder, is provided for directing a measured charge of the agent into a funnel leading to an outlet conduit. The pressure established within the chamber forces the agent through the conduit which is in turn connected to a delivery tube by which the agent is used to coat the mold surface directly or is fed into a stream of metal in a centrifugal tube casting apparatus. An outlet valve in the outlet tube is provided for selectively permitting the passage of the agent and gas mixture to the casting apparatus.

Growing community of inventors

Birmingham, AL, United States of America

William E Snow