Compressor control system to improve turndown and reduce inciden

Details Compressor control system to improve turndown and reduce inciden Compressor control system to improve turndown and reduce inciden

1989-05-15

1990-12-04

Fox, John C.

Pumps

Condition responsive control of pump drive motor

Single motor control element responsive to means sensing...

417 18, 417 53, F04B 4900

Patent

active

049750240

ABSTRACT:
A method and apparatus for regulating the operation of a compressor system including a compressor moving a gas from an intake conduit through a discharge conduit to a gas storage reservoir are disclosed. In accordance with the method, an unload valve in an unload conduit connected to the discharge conduit is initially fully closed and an inlet valve in the intake conduit is initially fully opened. Then the inlet valve is closed by an amount necessary to maintain the discharge pressure at a design pressure level and at a gas flow rate between the design flow level and a minimum flow level. When the gas flow rate drops below the minimum flow level, the inlet valve is maintained in its last position and the unload valve is opened by an amount necessary to maintain the discharge pressure below a first pressure level set higher than the design pressure level. If the unload valve remains open beyond a position set point for longer than a first predetermined period of time, the unload valve is fully opened and the inlet valve is fully closed. Then if the system pressure drops below a second pressure level lower than the design pressure, the control steps discussed above are repeated.

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patent: 4164035 (1979-08-01), Glennon et al.
patent: 4191511 (1980-03-01), Stewart et al.

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