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Typical control lines compressor antisurge control response

asked Jun 22, 2014 in Process by odadmin (21,030 points) | edited Jun 23, 2014 by odadmin

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answered Jul 30, 2014 by odadmin (21,030 points)

Safety On Line

Safety on line is a control line representing the distance from the surge limit line at which the safety on response will assume a surge has occurred and increase the surge control margin.

Surge Limit Line

Surge limit line is a line on compressor map representing the minimum flow below which the compressor will surge.

Recycle Trip Line

Recycle trip line defines an operating point beyond which recycle trip response will ratchet the control valve open.

Surge Control Line

Surge control line (SCL) defines the minimum distance between the operating point and surge limit line. As shown in figure SCL is always to the right to the SLL.

Tight Shut-Off Line

Tight shut-off line is a control line representing the minimum deviation for the tight shut-off response.

Surge control margine

The surge control margin (SCM) is the distance between SCL and SLL.