QUESTION FOR NASH VACUUM PUMPS L900. CAVITATION PROBLESM AFTER REPAIRS

[vicasazn]

Hello,

I'm working in a paper factory. Until now we have been fixing Siemens vacuum pumps and we hadn't have problems. Now we have started to repair Nash L900 vacuum pumps and we adjust the rotor and the cones according to the manual clearances (0.2", 5 mm). The pump performance improves very much but always we have cavitation problems. (two times). We have checked all the parameters and they seemed to be ok.

Could we have this problem due to these clearances should be a little bit larger (0.25", 6mm)????

Now we are thinking of sacrifice performance in order to avoid this cavitation.

Best regards.

 

[Artisi]

Guess you have improved performance which means it has lower (or is that higher) vacuum which leads to cavitation. If opening the clearances a bit doesn't effect the overall application when I would go ahead so as to eradicate cavitation.

It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)

 

[vicasazn]

Hello Artisi,

Thank you for your advise.

I would be interested in similar experiences with these NASH vacuum pumps to know if there would be other alternative or to know about people who have done this change in the clearances of the vacuum pumps and what was the result regarding cavitation.

Best regards.