Pressure, piston rod load and rod reversal duration monitoring
Crosshead guide vibration and dynamic piston rod load derived from indicated pressure for one crankshaft revolution. The diagram shows an example with a damaged piston/piston rod-connection. The continuous monitoring of the rod reversal duration is an essential way to prevent failures of small end bearing based on underlubrication due to inadequate rod load reveral span of time.

The segmented analyses of the peak-to-peak values is a unique PROGNOST® capability and integrated part of the Safety Protection module. The picture shows a normal piston rod position curve (grey) and shortly before a piston rod breakage (blue).

p-V diagram: the coloured areas show the suction loss (bottom) and discharge loss (top). This diagram also shows the polytropic exponents (expansion/compression) which help to automatically detect leakages of sealing components such as valves, packings, piston sealing rings in early stages. Further, this measurement shows any problems with active valve control systems.

Ringbuffer
Gapless 10 minutes ringbuffer memory for all time signals and process data for detailed root cause analyses.

Time period:
10 minutes, gapless, every revolution, self-overwriting ("first in - first out")
Sample rate: 25.000 samples/sec
Captured data: All online signals with resolution of 25kHz and all monitored DCS values
Capacities: Automatic saving on internal HD: 5 x start, 8 x stop, 10 x alarm, 8 x alert, 5 x user = 36 different ringbuffer
Unlimited storage on external disc or drive

Adaptive condition monitoring based on operating condition e.g. due to changing suction/discharge pressures to avoid false alarms because of changing operating conditions