Michael Lee Singleton

US Patent:

53306570, Jul 19, 1994

Filed:

Apr 27, 1992

Appl. No.:

7/874793

Inventors:

Gordon R. Chapman - Missouri City TX
Donald R. Andruik - Houston TX
James V. Van Matre - Baytown TX
Andre Stenzel - Houston TX
Robert J. Logan - Houston TX
Edwin D. McCrory - Houston TX
Michael W. Singleton - Houston TX
Robert M. Richmond - Bakersfield CA

Assignee:

Gas Research Institute - Chicago IL

International Classification:

C02F 152

US Classification:

210712

Abstract:

A system and method for removing asbestos and other hazardous solids from a slurry collected during removal of insulation from pipelines, equipment and other structures. The slurry is collected in a collection pan that is attached to a shroud of a hydrocleaning machine. Solid particles are separated from the slurry by passing the slurry through various stages of filters. Pumps are used to transfer the slurry from the collection pan through the filter stages. A first flocculent is injected into the slurry to coagulate the solid particles into individual masses. A second flocculent is injected into the slurry, downstream from the injection point of the first flocculent, in order to coagulate a majority of the remaining solid particles. The coagulated masses of solid particles are removed by passing the slurry through a screen shaker. The slurry discharged from the screen shaker is then passed through further filters.

US Patent:

55890733, Dec 31, 1996

Filed:

May 5, 1994

Appl. No.:

8/239201

Inventors:

Gordon R. Chapman - Missouri City TX
Donald R. Andruik - Houston TX
James V. Van Matre - Baytown TX
Andre Stenzel - Houston TX
Robert J. Logan - Humble TX
Edwin D. McCrory - Sugarland TX
Michael W. Singleton - Houston TX
Robert M. Richmond - Bakersfield CA

Assignee:

Gas Research Institute - Chicago IL

International Classification:

C02F 152
C02F 124

US Classification:

210704

Abstract:

A system and method for removing asbestos and other hazardous solids from a slurry collected during removal of coatings from pipelines, equipment and other structures. The slurry is collected in a collection pan that is attached to a shroud of a hydrocleaning machine. Contaminated air and the slurry is transferred to a vacuum hopper. The contaminated air is removed from the vacuum hopper. The contaminated air is filtered to remove solid particles. Solid particles are preferably separated from the slurry by passing the slurry through various stages of filters. Pumps are used to transfer the slurry from the collection pan through the filter stages. A first flocculent is injected into the slurry to coagulate the solid particles into individual masses. A second flocculent can be injected into the slurry in order to coagulate a majority of the remaining solid particles. The coagulated masses of solid particles are removed by passing the slurry through a weir or a screen shaker.