Self-contained instrument and seal air system for a centrifugal

Details Self-contained instrument and seal air system for a centrifugal Self-contained instrument and seal air system for a centrifugal

1993-06-09

1995-08-22

Bertsch, Richard A.

Pumps

Processes

417313, 417364, F04B 2300

Patent

active

054433690

ABSTRACT:
A self-contained seal air and instrument air system for a compressor includes a pneumatically controllable inlet valve and a pneumatically controllable valve means for depressurizing the compressor. An electronic controller directs compressor operation. A receiver tank is provided which includes an inlet through which compressed air enters and an outlet port. A means is provided for separating the compressed air flowing from the receiver into a first path which provides a first source of seal air to seals of a rotating shaft of the compressor, and a second path which provides instrument air. A means is provided for separating the compressed air flowing in the instrument air path into a first path which provides actuating air to the inlet valve and the valve means for depressurizing the compressor, and a second path which provides a source of signal air. First and second current-to-pressure converters are flow connected in the signal air path and are disposed in electronic signal receiving relation to the electronic controller. A second source of seal air is provided from a tap port disposed at a predetermined location on the compressor discharge.

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patent: 5362207 (1994-11-01), Martin et al.
patent: 5370152 (1994-12-01), Carey et al.
patent: 5386873 (1995-02-01), Harden, III et al.

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