Monthly Archives for November 2009

Reciprocating Compressor Troubleshooting – Unloader failure

pneumatically operated, automated unloaders. A mal-functioning unloader remains in an open position and thus reduces the capacity of the compressor. To identify this problem, proceed as follows: • Set the compressor to run at a constant speed. • Close the … Continue reading

19. November 2009 by Jack
Categories: RECIPROCATING COMPRESSORS | Tags: , | 1 comment

Reciprocating Compressor Troubleshooting – Evaluating lost compression horse power

The first step in troubleshooting reciprocating compressors is to quantify the extent of the problem. How much compression work has actually been lost? An approximate rule of thumb is: Inserting the data from the El Gringo operation in the above … Continue reading

19. November 2009 by Jack
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Glycol Dehydrator – Dehydration Capacity VS Temperature

Three process requirements must be met for gas to be dried in a standard glycol dehydration unit: 1. The gas velocity through the contactor tower must not be great enough to entrain glycol into the dried gas. Theoretically, the entrainment … Continue reading

07. November 2009 by Jack
Categories: Glycol Dehydration | Tags: | Leave a comment

Flooding Dehydrator Tower – Plugged Tray

Drying towers in natural gas service can become rapidly fouled with drilling mud or formation and frac sand. The sand appears in the wellhead gas when the rate of gas production becomes excessive, and the sand is thus sucked out … Continue reading

01. November 2009 by Jack
Categories: Glycol Dehydration | Tags: | Leave a comment

Flooding Dehydrator Tower – Fouling vs Flooding

A distillation column can flood due to dry damage, undersized liquid downcomers, high liquid level in the bottom of the tower, foulcommonly encountered in natural gas conditioning. The troubleshooter should first check for flooding due to excessive vapor velocities. The … Continue reading

01. November 2009 by Jack
Categories: Glycol Dehydration | Tags: | Leave a comment

Glycol Dehydrator – Flooding Dehydrator Tower

The field supervisor’s first indication of a flooded contactor tower is usually a report of excessive glycol loss. A check of a lowpoint bleeder on the gas pipeline downstream of the tower will show glycol. After refilling the glycol reboiler, … Continue reading

01. November 2009 by Jack
Categories: Glycol Dehydration | Tags: | Leave a comment

Glycol Dehydrator – Leaking Feed-Effluent Exchanger

The hot glycol from the reboiler is cooled by heat exchange with the wet glycol from the contactor. This heat transfer typically takes place in a double-pipe or plate-type exchanger. On one of the double-pipe heat exchangers, I noticed that … Continue reading

01. November 2009 by Jack
Categories: Glycol Dehydration | Tags: | Leave a comment

Glycol Dehydrator – Glycol Regeration Temperature

The gas exiting the top of the contactor in Figure 6-1 can be assumed to be in equilibrium with the reboiled—i.e., dry—glycol. The higher the glycol reboiler temperature, the dryer the glycol. The dryer the glycol, the dryer the treated … Continue reading

01. November 2009 by Jack
Categories: Glycol Dehydration | Tags: | Leave a comment