Recent content by Nicolas13

Thanks for your reply: The pressure instruments are new, two are installed with the same measures, one for each seal. The seal are liquid film type with cylindrical bushing. No inert gas is used.Contaminated oil is evacuated from the oil system thru oil drainers. If you refer to API614 figure...

For an old process centrifugal compressor equiped with an isolation bladder inside the accumulator (API614 Figure 2A-14; 50 liter), the oil pressure does not correspond to the height of the liquid (4.5m). About 150mb is missing. The bladder is causing this anomaly; the existing bladder material...

is the chamber between the seals connected to a flare line with a non return valve? If this chamber may stay pressurized during the N2 source failure, then you can run for some mn. The operatin time after N2 failure depends of the material, design of the seals, the actual worn out, fouling. One...

What do you want to clean, the seal faces (internal or external) to avoid/reduce the process gas leakage? No chance by flushing wih N2.

yes , you can increase it to 6 or 7 years, this depends on the reliability and RCA of past failure.

It could be also a too low flow with inlet recirculation

problem of cavitation, NPSHa is too low

in reaction turbine when a small blade fails the rotor vibration could stay at low value without noticeable event.

Thank you Walt I knew all of them (except miataturbo). Nicolas

in my case the brg housing and oil deflector are hot due to steam leakage. 1. What I'd like to understand is the difference of vibration rub pattern between rotor rubbing on steel strip (light rub on steam laby supported by springs) and coked oil deflector which is normally a soft pad. 2. I...

byrdj: you're right, I will try to inject air (not easy but feasible) and protect the oil deflector with a shield.

Sorry but it does exist, I already met this phenomenon in machines( hot gas expander, steam turbine) and others people also (GE, Bently Nevada). Cleaning would be in service, ok for spray temp, too costly to shut down the plant for this light rub that is why we imagine this scenario. thank for...

A 4400 rpm high temperature steam turbine vibrates intermittently. The fouling/coking of the oil labyrinth is suspected as origin. If this is the case and after confirmation, it is possible to clean the deflector with the turbine in normal operation by means of a special high-pressure cleaner...

Plant is in Europe

This gas is already compressed by several reciprocating compressors. For reliability reasons plus the increase of capacity the question of new compressor type is raised. About the axial type, the suction volume (7000Nm3/h) is too low. Thanks for comments.