Hi all,

I have been having lots of problems with a particular Pfeiffer rotary pump,
model DUO2.5 that is installed on our Kiel IV carbonate device. In less
than 3 years we have had to replace 3 pumps. Two of the three backed the
60l turbo the other the roughing. Two had motor related failures the other
a main shaft seal. This failure rate in my opinion is high and Pfeiffer
agrees. At this rate (less than a year) they die before you are scheduled
to service them. Two were fortunately replaced while under warranty, the
third I have to deal with.

My questions to the list is only for DUO2.5 Pfeiffer pump-

1. How many of you out there have experienced problems with the Pfeiffer
DUO2.5 rotary pump.

2. About how long did it run before it failed?

3. What was the failure?

4. What is the application?

Any input would be appreciated, you can respond directly to me or the list,
others may want to know the history of this pump as well. To mimimze the
traffic, I am really only interested in this DUO2.5 model pump. At present
I have do decide whether to repair, replace the pump with another model or
another vendor. Since it was a recent Finnigan product (this is not an
attack on Finnigan), Pfeiffer was what comes on the unit.

Thanks in advance for your feedback

Cheers,

Dave
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David A. Mucciarone
Stanford University
Dept. Geological & Environmental Sciences
Building 320, Room 118
Stanford, CA 94305-2115
650-723-0817 (office)
650-725-2199 (fax)
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