Compressor Surge 4a1b

! ! E G R U S R O S S E R P COM

AHA B U S M A S E E ZL D FA D A M M MUHA

Internal

TOPICS • DEFINITION OF SURGE • SYMPTOM OF SURGE • WHY SURGING ARE UNDESIRABLE? • COMPRESSOR OPERATING CURVE • HOW TO PREVENT SURGING? • THE CCC ANTI-SURGE CONTROL Internal

It then lead to decrease in Then How SURGE occurred ? flowrate to the receiver due to COMPRESSOR SURGE IS THE REVERSIBLE FLOW THROUGH A CENTRIFUGAL OR AXIAL resistance toCOMPRESSOR inlet flow 3 2

SO WHAT IS COMPRESSOR SURGE? The flowrate to the compressor will decrease as well

•

Ps

P2

Pr

COMPRESSOR COMPRESSOR

1

4

SURGE !!

Supply tank

Internal

P1

Leading to decrease of kinetic energy thus decrease in pressure output, P2. Hence, P2 < Pr

Compressor reversed Gas normallyGas flowflow in this direction

Sudden decrease flow at point 4

Receiver

Causing pressure in receiver, Pr to increase.

SYMPTOM OF SURGE Discharge temperature increase

Sudden low system flow

Excessive compressor radial vibration

Violent fluctuation of discharge pressure

Abnormal sound at compressor Internal

WHY SURGE UNDESIRABLE? Gas will flow backwards & pushes rotating assembly

Rotating shaft will slam into thrust bearing

Severe Compressor damage if the compressor cannot handle it.

Internal

Rotating shaft will slam into thrust bearing

Cause rotating element to come into with stationary element

COMPRESSOR OPERATING CURVE

Internal

HOW TO PREVENT SURGE! 1.

INSTALLING SPILL BACK VALVE

Internal

FLOWRATE TO COMPRESSOR WILL INCREASE & MAINTAINED ABOVE MINIMUM FLOW

HOW TO PREVENT SURGE! 2.

Internal

REDUCING OR INCREASING DRIVER SPEED UNTIL COMPRESSOR OPERATING POINT MOVE AWAY FROM SURGE LINE

CCC ANTI-SURGE CONTROL

Internal

CCC ANTI-SURGE CONTROL Antisurge controller

Antisurge valve

Internal

Spillback line from antisurge valve

CCC ANTI-SURGE CONTROL

Opening of anti-surge valve Surge count no of time the compressor hit the surge line Internal

U O Y K N A H T Internal