I removed the backing pumps for TP2 and TP3 today to test ultimate pressure and determine if they need a tip seal replacement. This was done with Jon backing me on Zoom. We closed off TP3 and powered down TP3 and the auxilliary pump, in order to remove the forepumps from the exhaust line.
Once pumps were removed I connected a Pirani gauge to the pump directly and pumped down, results as follows:
TP2 Forepump (Agilent IDP 7):
TP3 Forepump (Varian SH 110):
TP3 forepump defintely needs a new tip seal, and while the pressure on TP2 Forepump was good there was a significant amount of particulate that came out of the exhaust line, so a new tip seal might not be needed but it is recommeded.
I agree with your assessment, Jordan. If I'm not mistaken the scroll pump for TP2 is new; we had a very early failure with the last new scroll pump (the forepump for TP3) tip seals at just over 5000 hours. Glad to see my replacement seals held up for over 60K hours. If this is the trend with these pumps, we can simply run them to around 60000 hours and replace the seals at that time, rather than waiting for failure! - Chub