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It is worth to highlight that both Mechanical • exhaust gas stack;
Running Test and Performance Test are not a test • enclosure and ventilation system and fire
on the whole compressor train (string) mounted on
the baseplate, but only the individual compressors. fighting;
Therefore, these tests should not be regarded as • oil coolers.
a simulation of the compressor train in operation.
for the electric motor:
1.3 Complete unit test • MCC (Motor Control Center);
• UCP (Unit Control Panel);
The difference with the Mechanical Running Test is • VSD (Variable Speed Driver).
that the complete compressor train (string) driver
+ compressors + gearbox + coupling mounted on for the compressor:
its own metallic baseplate is tested and not the • anti-surge system.
individual items (figure 2).
The main components of a string are the following: On the test bed the BOP (Balance Of Plant):
• metal baseplate (skid); • inlet and outlet KOD (Knock-Out Drum);
• driver; • intercoolers and aftercoolers;
• compressors; • interconneting piping and cables between the
• gearboxes;
• mechanical couplings; compressors to the intercooler / aftercooler is
• DGS (Dry Gas Seals) system; excluded.
• lubrication system;
• UCP (Unit Control Panel) (but sometimes it is Of course, these items are part of the compression
train. The BOP can be supplied by the train
excluded); Manufacturer or by others; in both cases they are
• piping and cables among the components on excluded from the factory test.
There are three versions of the complete unit test.
the skid; They are listed herebelow in order of severity:
• vents and drains. • C1) Complete unit test in closed loop at full
The components excluded are: power;
• C2) Complete unit test in closed loop at partial
for the gas turbine:
• inlet air system; load (in similarity);
• C3) no-load Complete unit test.
Fig. 2 - Layout of a compressor train with driver and two compressors
Impiantistica Italiana - Luglio-Agosto 2015 41
