Can anti-surge system fails? Simple answer it can, as long as made by human, it can fail. Not really necessary fail cause by “hi-tech” electronic control devices inside, but sometimes could be caused by error when setting the surge control line.

Can anti-surge system fails? Simple answer it can, as long as made by human,
it can fail. Not really necessary fail cause by ‘hi-tech’ electronic
control devices inside, but sometimes could be caused by error when setting
the surge control line.

Well, this is rare. But, what did about if anti-surge system fail caused by
the process??? Very rare again, but it does not mean cannot happen.

Let me imagine for you folks…

A set of wells just be work over, then reservoir engineer expect significant
gain, valuable 10% NPV, very quick pay back period, increase production both
oil and gas, U$D, Rp, etc..mmmhhhh

Long pipeline having several tie-in points along segment, we called trunkline
is ready for use. Just waiting the wells, Operation Superintendent is not patient
and decides to start centrifugal compressor. The compressor is set-up to be
run in recycle mode and
not in un-load mode.

Well, rather that waiting those guys who did purging on satellite trunkline,
we can cheat the start…he said.

Soon, after the wells are ready, compressor shutdowns due to vibration/surge.

Compressor surge looks like delay to shutdown, so hi-hi vibration takes over
this job. Why?

Continue re-circulation of gas have impact reducing heavier components because
of condensing gas after repetitive across after-cooler, so it cause molecular
weight of gas decreases. Reducing molecular weight
means you have to re-calibrate your surge slope and probably surge control line,
because if not, he will not sense that he already surge………then
vibration switch takes over. .

Reference:

Larry L. Lily PhD, Gas Conditioning & Processing Course, ‘ Compressor
and Driver Equipment’, Ho Chi Minh City, Vietnam, March – April 2001.