KOD Case Study
Fortunately, the author has faced no KOD inadequacy problem. The plant needed to shut down its 3 barrel centrifugal compressor, involving 2 days shutdown to renew the eroded intermediate casing last wheel labyrinth set. The author concluded from laby visual inspection that the synthesis gas carried water eroded the labys – the root cause.
The tech services engineers, the plant’s troubleshooters affirmed that no water carryover likelihood from the 1st and 2nd barrels inlet MEs exiting 60 bars of synthetic gas. Nevertheless, they offer no other reason for the laby erosion. A tech journal ad on Super Efficient KOD (SEKOD), capable of coalescing even sub-micron sized and emulsified particles and draining these periodically, attracted author’s attention. Since no other solution was apparent, the management authorized the author to install the SEKOD, as its negligible cost compared to laby erosion losses. Thanks to the SEKOD installed, downstream existing KOD during the following TA Laby erosion and its associated huge losses vanished forever.
Crew changed the laby sets at 8-year intervals, if necessary, during the scheduled TAs, as an abundant caution.