Liquid Air Corporation

Jean-Luc Hubert

Miles S Bajcar

William A Ellett

Joseph M Chitty

Todd Harvey

To remove a thick insulating coating from a steel pipeline, with high efficiency and speed, multiple cooling and scraping steps are performed sequentially. In a first cooling step, a low temperature coolant is sprayed onto the coating for a time sufficient to cool only a portion of the coating to a temperature below the embrittlement temperature thereof. After scraping away the embrittled outer layers of the coating, subsequent cooling and scraping steps are performed until all of the coating has been embrittled and removed. It has been found that the time required for removing the coating by use of such multiple spraying and scraping steps is substantially less than that where the coating is to be embrittled in a single step.

Multi-step combined mechanical/thermal process for removing coatings

A protective coating on a pipe is embrittled by enclosing a portion of the pipe in a body defining an annular space around the protective coating. A pressurized LN2 cryogen is expanded within this annular space for sufficient time to lower the temperature of both the protective coating and the underlying pipe to a temperature below the temperature of embrittlement of the coating. The LN2 is expanded so as to form elliptical patterns on the pipe surface.

Efficiency process and apparatus for embrittling an outer protective

The protective coating on a pipe is embrittled and removed by enclosing a portion of the pipe in a body defining an annular space around the protective coating. A pressurized liquid nitrogen cryogen is expanded within this annular space for a sufficient time to lower the temperature of both the protective coating and the underlying pipe to a temperature below the temperature of embrittlement of the coating.

Process and apparatus for embrittling and subsequently removing an outer

A multi-tier refrigeration tunnel of modular construction, with lateral doors, in which fans are disposed between each tier, in which they are driven by shafts extending from ceiling to floor of the tunnel, and in which the shafts are driven by top mounted fan motors. A multi tier refrigeration tunnel, not of modular construction and without lateral doors, in which fans are disposed between each tier, in which the fans are driven by shafts extending from the floor of the tunnel and from the ceiling of the tunnel, in which the shafts are driven by top mounted and bottom mounted fan motors. A multi tier refrigeration tunnel, and by extension also a single tier refrigeration tunnel, in which two products of different required processing times can be processed simultaneously. A multi tier refrigeration tunnel, preferably without lateral doors but not necessarily, in which fans are disposed above the upper tier and in which fans are disposed next to, and to the side of, the lower tiers.

Method and apparatus for enhancing production capacity and flexibility

A linear freezer for cooling and/or chilling and/or crust freezing and/or freezing various products, said freezer using carbon dioxide or nitrogen. The freezer comprises means to balance the exhausted cold gas between the entry and exit openings and sucking means, to extract the exhausted cold gas at said both entry and exit openings, with no substantial variation of flowrate of the exhausted cold gas than that generated from the enclosure without said sucking means.

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Willowbrook, IL, United States of America

Jean-Luc Hubert