Reverse rotation of turbine-driven centrifugal compressor
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After the turbine-driven centrifugal compressor stops, its speed drops to zero; afterwards, the speed appears again, and reverse rotation is suspected. How should this issue be resolved?
Check whether the compressor outlet valve is closed or tightly shut
The outlet check valve may leak, but it should not be the main cause. Our compressors are propylene refrigeration compressors with three inputs and one output; the inlet pressure for stages 2 and 3 is 0.5 MPa, while the inlet pressure for stage 1 is 30 kPa. It was initially suspected that the large pressure difference between stages 2 and 3 was causing the reverse rotation, and as a result, technical modifications were carried out to add a reverse rotation prevention line from the inlet of stage 3 to the inlet of stage 1, but the problem still persists.
The outlet valve of the pipeline isn’t properly closed; it should be checked immediately, as this can easily cause damage to the equipment.
We also have propylene refrigeration compressors!
It’s the same with us; it must be reversed. We’ve encountered the same problem as well. What type of dry gas seal do you use? Is the crank mechanism a ratchet mechanism or a crank pin?
Is it a real reversal, or is the rotation speed showing a negative value?