Praxair Technology, Inc.

Carl L Schwarz

Ahmed F Abdelwahab

Henry Edward Howard

Lee Jonathan Rosen

Nick Joseph Degenstein

Reh-Lin Chen

Michael John Stanko

John Henri Royal

William J Owens

David J Abrahamian

Kang Xu

Nick J Degenstein

The present disclosure relates to multistage centrifugal high purity hydrogen compressors for compressing low molecular weight fluids. More particularly, the present disclosure relates to the multistage high purity centrifugal hydrogen compressors wherein each stage comprises an vaned diffuser having at least two rows of a plurality of blades.

Hydrogen centrifugal compressor

A method for compression of an incoming feed air stream using at least two variable speed compressor drive assemblies controlled in tandem is provided. The first variable speed drive assembly drives at least one compression stage in the lower pressure compressor unit driven while the second variable speed drive assembly drives higher pressure compression stage disposed either in the common air compression train or the split functional compression train of the air separation plant. The first and second variable speed drive assemblies are preferably high speed, variable speed electric motor assemblies each having a motor body, a motor housing, and a motor shaft with one or more impellers directly and rigidly coupled to the motor shaft via a sacrificial rigid shaft coupling.

Method for compressing an incoming feed air stream in a cryogenic air separation plant

A coupling to attach an impeller of a compressor to a shaft of an electric motor. The coupling has a coupling body that is attached at a first of the ends thereof to the impeller and at the opposite second end, to the motor shaft. The coupling body has a deformable section between the first and second ends of the coupling body. The deformable section is configured such that under an unbalanced loading exerted against the coupling body upon a failure of the impeller, the deformable section will permanently deform without the ultimate strength of a material forming the coupling body being exceeded and prior to a permanent deformation of the shaft. In such manner, the electric motor is protected from damage upon a failure of the impeller.

Coupling for directly driven compressor

A method and apparatus for producing and controlling flow rate of a compressed gas produced by a compression system having one or more stages of compression formed by a centrifugal compressor or compressors, inlet guide vanes to control flow through the compression stage or stages and an electric motor directly coupled to the stage or stages having a restricted speed zone within which vibrational modes can damage the electric motor. A desired flow rate is obtained by speed adjustment alone and with the inlet guide vanes positioned at 0&#xb0; when the speed will lie above or below the restricted speed zone. Where a desired flow rate would require extended operation of the electric motor at a speed within the restricted speed zone, the speed is set to the uppermost level of the restricted speed zone and the desired flow rate is obtained through appropriate positioning of the inlet guide vanes.

Gas compressor control system preventing vibration damage

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East Aurora, NY, United States of America

Carl L Schwarz